Energy-saving air conditioning system and air conditioning system waste heat recovery method

Abstract

The application provides an energy-saving air conditioning system and an air conditioning system waste heat recovery method, and belongs to the technical field of refrigeration equipment. The air conditioning system comprises a compressor, an outdoor heat exchanger and an indoor heat exchanger, and the compressor, the outdoor heat exchanger and the indoor heat exchanger are connected into a refrigeration cycle system through refrigerant pipelines. The air conditioning system further comprises a heat recovery system, which is connected between the indoor heat exchanger and the outdoor heat exchanger. The heat recovery system generates electricity by using the heat of the refrigeration cycle system and stores the electric energy. The air conditioning system recovers the waste heat of the refrigeration cycle system by using the heat recovery system, can recover most of the energy consumption of the compressor, and makes the whole air conditioning system more energy-saving and environment-friendly.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of refrigeration equipment, in particular to an energy-saving air conditioning system and a method for recovering waste heat of the air conditioning system. BACKGROUND

[0002] As a unit for processing air temperature change, the air conditioning system can adjust the temperature, humidity, cleanliness and air flow rate of the air in the use area to meet the requirements of human comfort or process. The existing air conditioning system has the following shortcomings: the work of the compressor is converted into heat, and the excess heat is released to the surrounding environment, causing waste of waste heat. This not only affects the environment around the air conditioner, but also wastes energy. In today's energy shortage, the waste of waste heat of the air conditioner has become a problem that needs to be solved urgently. SUMMARY

[0003] To overcome the problems in the related art, one of the purposes of the present application is to provide an energy-saving air conditioning system, which recovers the waste heat of the refrigeration cycle system by using a heat recovery system, and recovers most of the energy consumption of the compressor, so that the entire air conditioning system is more energy-saving and environmentally friendly.

[0004] An energy-saving air conditioning system comprises:

[0005] A compressor, an outdoor heat exchanger and an indoor heat exchanger are connected into a refrigeration cycle system through refrigerant pipelines;

[0006] A heat recovery system is connected between the indoor heat exchanger and the outdoor heat exchanger, which generates electricity by using the heat of the refrigeration cycle system and stores the electric energy.

[0007] In the preferred technical solution of the present application, the heat recovery system comprises a liquid storage tank, a power generation component and a power storage component, the liquid storage tank is provided with a first inlet and a first outlet, the first inlet is in communication with the refrigeration cycle system between the outdoor heat exchanger and the indoor heat exchanger; the first outlet is in communication with the power generation component, the liquid storage tank provides the power generation component with gas or liquid with high pressure energy; the power generation component is electrically connected with the power storage component, and the electric energy generated by the power generation component is stored in the power storage component.

[0008] In the preferred technical solution of the present application, a four-way reversing valve is arranged on the refrigeration cycle system between the outdoor heat exchanger and the indoor heat exchanger, the four-way reversing valve has an A port, a C port, a B port and a D port, the A port is in communication with the outdoor heat exchanger, the C port is in communication with the indoor heat exchanger, and the D port is in communication with the first inlet.

[0009] In the preferable technical scheme of the present application, the tank-in heat exchanger is arranged in the liquid storage tank, the liquid inlet of the tank-in heat exchanger is communicated with the liquid outlet of the power generation component, and the liquid outlet of the tank-in heat exchanger is communicated with the B port.

[0010] In the preferable technical scheme of the present application, the tank-in heat exchanger comprises a base plate and heat exchange pipes, the base plate is fixed on the inner wall of the liquid storage tank, and the heat exchange pipes are fixed on the base plate; the heat exchange pipes are arranged in a ring shape, and the ring-shaped heat exchange pipes are arranged in multiple layers on the base plate; the heat exchange pipes have a heat pipe liquid inlet and a heat pipe liquid outlet, the heat pipe liquid inlet is communicated with the liquid outlet of the power generation component, and the heat pipe liquid outlet is communicated with the B port.

[0011] In the preferable technical scheme of the present application, a guide plate is arranged in the middle of the heat exchange pipe, the guide plate comprises a bottom plate and a guide part, the bottom plate is fixed on the bottom of the heat exchange pipe, and the guide part is arranged in the middle of the bottom plate and protrudes from the middle of the ring-shaped heat exchange pipe to the base plate, and the cross section of the guide part is circular or polygonal.

[0012] In the preferable technical scheme of the present application, the power generation component is a hydraulic motor, the hydraulic motor comprises a shell, a motor gear set, a speed reducer and a generator, the motor gear set and the speed reducer are arranged in the shell, and the speed reducer is arranged outside the shell; the gas or liquid with high pressure energy in the liquid storage tank enters the shell to drive the motor gear set to rotate, the motor gear set drives the speed reducer to rotate, and the speed reducer drives the generator to rotate to generate electricity.

[0013] In the preferable technical scheme of the present application, the power storage component comprises a base, a protective cover and a battery pack, the battery pack is fixed on the base, the protective cover is arranged on the base and covers the battery pack completely, and the battery pack is electrically connected with the power generation component.

[0014] An installation groove is arranged on the base, the shape of the installation groove is matched with the shape of the bottom of the protective cover, and annular sealing rubber is arranged on the installation groove.

[0015] The second object of the present application is to provide a waste heat recovery method of an air conditioning system, which is implemented by using the energy-saving air conditioning system as described above.

[0016] In the preferable technical scheme of the present application, the waste heat recovery method of the air conditioning system comprises the following steps:

[0017] The high-temperature and high-pressure refrigerant is introduced into the liquid storage tank, and it is judged whether the pressure and liquid level of the liquid storage tank reach the preset value; if yes, the power generation component is started, and if no, the refrigerant is continuously introduced into the liquid storage tank;

[0018] The refrigerant in the liquid storage tank enters the power generation component to work, and after the pressure and temperature are reduced, the low-temperature and low-pressure refrigerant is returned to the tank heat exchanger to exchange heat in the tank heat exchanger;

[0019] The refrigerant exchanged heat by the tank heat exchanger enters the outdoor heat exchanger to participate in the refrigeration cycle.

[0020] The beneficial effects of the present application are:

[0021] The energy-saving air conditioning system provided by the present application comprises a compressor, an outdoor heat exchanger and an indoor heat exchanger, and the compressor, the outdoor heat exchanger and the indoor heat exchanger are connected into a refrigeration cycle system through refrigerant pipelines. The air conditioning system further comprises a heat recovery system connected between the indoor heat exchanger and the outdoor heat exchanger, which replaces the throttling valve in the traditional refrigeration system, saves the throttling component of the refrigeration system, and is conducive to reducing the cost. Moreover, the heat recovery system generates electricity by using the heat of the refrigeration cycle system and stores the electric energy. Therefore, the air conditioning system can recover most of the energy consumption of the compressor, so that the entire air conditioning system is more energy-saving and environmentally friendly.

[0022] The present application further provides an air conditioning system waste heat recovery method using the above-mentioned energy-saving air conditioning system. The method can convert the air conditioning waste heat into electric energy and store it, so that most of the energy consumption of the compressor can be recovered, which is conducive to improving the energy utilization rate and reducing heat emission. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 is a structural schematic diagram of the energy-saving air conditioning system provided by the present application;

[0024] Figure 2 is a structural schematic diagram of the connection between the four-way reversing valve and the heat recovery system provided by the present application;

[0025] Figure 3 is a structural schematic diagram of the liquid storage tank provided by the present application;

[0026] Figure 4 is a structural schematic diagram of the power generation component provided by the present application;

[0027] Figure 5 is a side view of the power generation component provided by the present application;

[0028] Figure 6 is a side view of the power storage component provided by the present application;

[0029] Figure 7 is a structural schematic diagram of the tank heat exchanger provided by the present application;

[0030] Figure 8 is a structural schematic diagram of the flow guide plate provided by the present application;

[0031] Figure 9 is a flow chart of the waste heat recovery method of the air conditioning system provided by the present application.

[0032] Reference signs:

[0033] 1, compressor; 2, outdoor heat exchanger; 3, indoor heat exchanger; 4, four-way reversing valve; 10, heat recovery system; 11, liquid storage tank; 12, power generation component; 13, power storage component; 41, A port; 42, B port; 43, C port; 44, D port; 111, first inlet; 112, first outlet; 113, tank heat exchanger; 114, flow guide plate; 120, housing; 121, motor gear set; 122, speed reducer; 131, protective cover; 132, battery pack; 133, base; 1331, mounting groove; 1332, sealing rubber; 1131, base plate; 1132, heat exchange pipe; 1141, bottom plate; 1142, flow guide portion. DETAILED DESCRIPTION

[0034] Preferred embodiments of the present application will be described herein below with reference to the accompanying drawings. While the preferred embodiments of the present application are shown in the drawings, it is understood that the present application can be embodied in various forms without being limited by the embodiments set forth herein. Rather, these embodiments are provided so that this application will be thorough and complete, and will fully convey the scope of the application to those skilled in the art.

[0035] The terminology used in the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and / or "comprising," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and / or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or groups thereof.

[0036] It is to be understood that the singular forms "a", "an", and "the" include plural referents unless the context clearly dictates otherwise. It is to be understood that the terms "comprise", "comprising", "comprises" and / or "comprising" when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and / or components but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or groups thereof.

[0037] As Figures 1-8As shown, an energy-saving air conditioning system comprises a compressor 1, an outdoor heat exchanger 2 and an indoor heat exchanger 3, which are connected into a refrigeration cycle system through refrigerant pipelines. The air conditioning system further comprises a heat recovery system 10, which is connected between the indoor heat exchanger 3 and the outdoor heat exchanger 2, generates electricity by using the heat of the refrigeration cycle system, and stores the electric energy.

[0038] The heat recovery system 10 is in communication with the refrigeration cycle system, and can simplify the components of the refrigeration system by replacing the installation of a throttling valve of a conventional refrigeration system. Specifically, the heat recovery system 10 comprises a liquid storage tank 11, an electricity generating component 12 and an electricity storage component 13. The liquid storage tank 11 is provided with a first inlet 111 and a first outlet 112, and the first inlet 111 is in communication with the refrigeration cycle system between the outdoor heat exchanger 2 and the indoor heat exchanger 3. The liquid storage tank 11 is made of a steel plate by bending and welding or a seamless pipe by assembling and welding, and is externally sprayed with heat insulation paint or wrapped with heat insulation material. The first outlet 112 is in communication with the electricity generating component 12, and the liquid storage tank 11 provides the electricity generating component 12 with gas or liquid having high pressure energy. The electricity generating component 12 is electrically connected to the electricity storage component 13, and the electric energy generated by the electricity generating component 12 is stored in the electricity storage component 13.

[0039] The operation process of the waste heat recovery of the air conditioning system is as follows: the high-temperature and low-pressure gaseous refrigerant is compressed by the compressor 1, and the pressure is increased to become high-temperature and high-pressure gaseous refrigerant; the high-temperature and high-pressure gaseous refrigerant is discharged from the compressor 1, enters the four-way valve, and enters the outdoor heat exchanger 2 through the four-way valve, and then enters the liquid storage tank 11 through another four-way valve. The compressor 1 continuously operates, and under the continuous work of the compressor 1, the pressure of the refrigerant in the outdoor heat exchanger 2 and the liquid storage tank 11 continuously rises, and the refrigerant exchanges heat with the outdoor environment in the outdoor heat exchanger 2 to cool the refrigerant (outdoor heat release process). The refrigerant enters the liquid storage tank 11 and continues to release heat in the liquid storage tank 11. Under the corresponding pressure and enthalpy, the refrigerant is liquefied in the liquid storage tank 11 and releases a large amount of heat, and finally forms a gas-liquid mixed state in the liquid storage tank 11. The liquid refrigerant sinks to the bottom of the liquid storage tank 11 due to its large density, and the liquid level of the refrigerant in the liquid storage tank 11 gradually rises, and the pressure in the liquid storage tank 11 also gradually rises. When the pressure and liquid level of the liquid storage tank 11 reach the target requirement, the power generation component 12 starts to operate, the high-pressure liquid refrigerant in the liquid storage tank 11 drives the generator to generate electricity, and the electrical energy is stored in the power storage component 13 through the charging circuit. After the high-temperature and high-pressure liquid refrigerant is worked in the power generation component 12, the pressure and temperature are reduced, and the low-pressure and low-temperature liquid refrigerant is returned to the liquid storage tank 11 to absorb heat, and then enters the indoor heat exchanger 3 through the four-way valve. When the temperature of the indoor heat exchanger 3 reaches the boiling point of the refrigerant, the refrigerant begins to vaporize and absorb heat. The high-temperature and low-pressure gaseous refrigerant after heat absorption in the indoor heat exchanger 3 returns to the four-way valve on one side of the compressor 1, and enters the compressor 1 through the four-way valve, completing the heat absorption and heating cycle of the heat recovery system 10.

[0040] The above-mentioned energy-saving air conditioning system comprises a compressor 1, an outdoor heat exchanger 2, and an indoor heat exchanger 3, which are connected into a refrigeration cycle system through refrigerant pipelines. The air conditioning system further comprises a heat recovery system 10 connected between the indoor heat exchanger 3 and the outdoor heat exchanger 2. The heat recovery system 10 replaces the throttling valve in the traditional refrigeration system, saves the throttling component of the refrigeration system, and is conducive to reducing costs. Moreover, the heat recovery system 10 generates electricity using the heat of the refrigeration cycle system and stores electrical energy. Therefore, the air conditioning system can recover most of the energy consumption of the compressor 1, making the entire air conditioning system more energy-saving and environmentally friendly.

[0041] Further, the refrigeration cycle system between the outdoor heat exchanger 2 and the indoor heat exchanger 3 is provided with a four-way valve 4, the four-way valve 4 has an A port 41, a C port 43, a B port 42 and a D port 44, the A port 41 communicates with the outdoor heat exchanger 2, the C port 43 communicates with the indoor heat exchanger 3, and the D port 44 communicates with the first inlet 111. The air conditioning system of the present application communicates the refrigeration system and the liquid storage tank 11 through the four-way valve, so that the refrigerant in the refrigeration system can enter the liquid storage tank 11 for heat exchange, realizing heat recovery. Further, the four-way valve 4 is an electromagnetic four-way valve.

[0042] In a more preferable embodiment, the liquid storage tank 11 is provided with an in-tank heat exchanger 113, the liquid inlet of the in-tank heat exchanger 113 communicates with the liquid outlet of the power generation component 12, and the liquid outlet of the in-tank heat exchanger 113 communicates with the B port 42. The in-tank heat exchanger 113 exchanges heat with the refrigerant in the liquid storage tank 11, which can improve the heat exchange effect of the refrigerant in the liquid storage tank 11 and ensure the liquefaction capacity of the high-pressure gaseous refrigerant in the liquid storage tank 11.

[0043] Further, the in-tank heat exchanger 113 includes a base plate 1131 and a heat exchange pipe 1132, the base plate 1131 is fixed on the inner wall of the liquid storage tank 11, and the heat exchange pipe 1132 is fixed on the base plate 1131; the heat exchange pipe 1132 is arranged in a ring shape, and the ring-shaped heat exchange pipe 1132 is arranged in multiple layers on the base plate 1131, the heat exchange pipe 1132 has a heat pipe liquid inlet and a heat pipe liquid outlet, the heat pipe liquid inlet communicates with the liquid outlet of the power generation component 12, and the heat pipe liquid outlet communicates with the B port 42. The in-tank heat exchanger 113 can be made of red copper pipe or other high-thermal-conductivity material and assembled with the base plate 1131. The ring-shaped heat exchange pipe 1132 realizes layer-by-layer heat exchange from the outside to the inside.

[0044] In a more preferable embodiment, the middle part of the heat exchange pipe 1132 is provided with a flow guide plate 114, the flow guide plate 114 includes a bottom plate 1141 and a flow guide part 1142, the bottom plate 1141 is fixed on the bottom of the heat exchange pipe 1132, and the flow guide part 1142 is arranged in the middle part of the bottom plate 1141 and protrudes from the middle part of the ring-shaped heat exchange pipe 1132 to the base plate 1131, and the cross section of the flow guide part 1142 is circular or polygonal. The flow guide plate 114 is made of stainless steel plate and plays a role in guiding the refrigerant. The flow guide plate 114 can improve the heat exchange efficiency of the refrigerant in the liquid storage tank 11. In a more specific embodiment, the cross section of the flow guide part 1142 is circular, and the distance between the outer wall of the flow guide part 1142 and the inner wall of the ring-shaped heat exchange pipe 1132 is 1-2 cm.

[0045] Combination Figures 4-5 The power generation component 12 is a hydraulic motor, which comprises a housing 120, a motor gear set 121 and a speed reducer 122 arranged in the housing 120, and a generator (not shown) arranged outside the housing 120. The gas or liquid with high pressure energy in the liquid storage tank 11 enters the housing 120 to drive the motor gear set 121 to rotate, the motor gear set 121 drives the speed reducer 122 to rotate, and the speed reducer 122 drives the generator to rotate to generate electricity. The motor gear set 121 is arranged in the housing 120 to divide the housing 120 into a high pressure area and a low pressure area. The power generation principle of the hydraulic motor is that the high pressure liquid refrigerant in the liquid storage tank 11 enters the housing 120 through the liquid inlet of the hydraulic motor housing 120, pushes the internal gear set of the hydraulic motor to rotate, and drives the generator to generate electricity. The working principle of this component is similar to that of hydroelectric power generation, but due to the small flow, a gear set is used to do work. If the air conditioning system is used on large air conditioners such as commercial air conditioners, the refrigerant flow is large, and a blade type or turbine type can be used to do work to generate electricity.

[0046] Further, the power storage component 13 comprises a base 133, a protective cover 131 and a battery pack 132, the battery pack 132 is fixed on the base 133, the protective cover 131 is arranged on the base 133 and completely covers the battery pack 132, and the battery pack 132 is electrically connected with the power generation component 12.

[0047] The base 133 is provided with a mounting groove 1331, the shape of the mounting groove 1331 is matched with the shape of the bottom of the protective cover 131, and the mounting groove 1331 is provided with an annular sealing rubber 1332.

[0048] After the protective cover 131 covers the battery pack 132, the protective cover 131 and the base 133 should be fixed to each other by fixing devices. For example, the protective cover 131 and the base 133 are fixed to each other by screws. The mounting groove 1331 and the sealing rubber 1332 are arranged, which not only facilitates the installation and positioning of the protective cover 131, but also improves the waterproof capability of the protective cover 131 and fully protects the battery pack 132.

[0049] As Figure 9 It is shown that the application also provides an air conditioning system waste heat recovery method implemented by using the above-mentioned energy-saving air conditioning system. The method can convert the air conditioning waste heat into electrical energy and store it, so that most of the energy consumption of the compressor 1 can be recovered, which is beneficial to improve the utilization rate of energy and reduce heat emission.

[0050] The waste heat recovery method of the air conditioning system comprises the following steps:

[0051] When the air conditioning system needs to be evacuated and injected with refrigerant before operation, about half of the volume of liquid refrigerant and half of the volume of gaseous refrigerant are first injected into the liquid storage tank 11, and the pressure in the liquid storage tank 11 is brought to the starting pressure of the power generation component 12. The inlet of the liquid storage tank 11 is provided with a one-way valve, and the outlet is provided with an electromagnetic valve. When the air conditioner is not running, the liquid storage tank 11 serves as a pressure potential energy storage device, reducing energy loss.

[0052] When the air conditioning system starts to operate, the compressor continuously works, and the following waste heat recovery steps are performed:

[0053] S100, the high-temperature and high-pressure refrigerant is introduced into the liquid storage tank 11, and it is judged whether the pressure and liquid level of the liquid storage tank 11 reach the preset value; if yes, the power generation component 12 is started, and if no, the refrigerant continues to be introduced into the liquid storage tank 11. The pressure preset value and the liquid level preset value are different according to different refrigeration systems. The preset value is set to ensure the refrigeration effect of the refrigeration system while utilizing waste heat to generate electricity, and to avoid the refrigeration system from not working normally due to excessive utilization of the refrigerant pressure of the refrigeration system.

[0054] S200, the refrigerant in the liquid storage tank 11 enters the power generation component 12 to do work, and becomes low-temperature and low-pressure refrigerant after the pressure and temperature are reduced. The low-temperature and low-pressure refrigerant returns to the tank-in heat exchanger 113 and exchanges heat with the refrigerant in the liquid storage tank 11 in the tank-in heat exchanger 113. The tank-in heat exchanger 113 ensures the ability of the liquid storage tank 11 to liquefy the high-pressure gaseous refrigerant into liquid refrigerant.

[0055] S300, the refrigerant exchanged heat by the tank-in heat exchanger 113 enters the outdoor heat exchanger 2 to participate in the refrigeration cycle.

[0056] In the refrigeration cycle of the air conditioning system of the present application, part of the heat in the refrigerant is released before entering the liquid storage tank 11, and part of the heat is converted into electrical energy due to the work of the power generation component 12. Compared with the traditional air conditioning system, the present application adds a heat work link of the refrigerant. During the heat work process of the refrigerant, the enthalpy at the outlet of the power generation component 12 is lower than the enthalpy at the inlet of the liquid storage tank 11, and the heat exchange area of the tank-in heat exchanger 113 in the liquid storage tank 11 is smaller than the heat exchange area of the outdoor heat exchanger 2 and the indoor heat exchanger 3. Therefore, the actual refrigerant returning to the liquid storage tank 11 absorbs less heat, and the temperature of the refrigerant does not rise much. The returned refrigerant can also be used for refrigeration heat absorption.

[0057] The method recovers the waste heat of the refrigeration system through the heat recovery system 10, which plays a role in throttling and pressure reduction for the refrigeration system. The heat recovery system 10 can replace the throttling valve of the traditional refrigeration system, which not only simplifies the throttling components of the refrigeration system, but also can improve the utilization rate of energy.

[0058] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of this application. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings. In the description of this application, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is usually based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this application and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this application; the directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0059] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0060] In addition, it should be noted that the use of "first", "second", and the like words to define parts is merely for the convenience of distinguishing the corresponding parts, and the above words have no special meaning unless otherwise stated, and therefore cannot be understood as limiting the scope of protection of the present application. The above is only the preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the scope of protection of the present application.

Claims

1. An energy saving air conditioning system, characterized by, The energy-saving air conditioning system comprises a compressor (1), an outdoor heat exchanger (2), and an indoor heat exchanger (3), which are connected into a refrigeration cycle system through refrigerant pipelines; A heat recovery system (10) is connected between the indoor heat exchanger (3) and the outdoor heat exchanger (2), which generates electricity by using the heat of the refrigeration cycle system and stores the electric energy; The heat recovery system (10) comprises a liquid storage tank (11), an electricity generating component (12), and an electricity storage component (13), the liquid storage tank (11) is provided with a first inlet (111) and a first outlet (112), the first inlet (111) is communicated with the refrigeration cycle system between the outdoor heat exchanger (2) and the indoor heat exchanger (3); the first outlet (112) is communicated with the electricity generating component (12), the liquid storage tank (11) provides the electricity generating component (12) with gas or liquid having high pressure energy; the electricity generating component (12) is electrically connected with the electricity storage component (13), the electric energy generated by the electricity generating component (12) is stored in the electricity storage component (13); The refrigeration cycle system between the outdoor heat exchanger (2) and the indoor heat exchanger (3) is provided with a four-way reversing valve (4), the four-way reversing valve (4) has an A port (41), a C port (43), a B port (42), and a D port (44), the A port (41) is communicated with the outdoor heat exchanger (2), the C port (43) is communicated with the indoor heat exchanger (3), and the D port (44) is communicated with the first inlet (111); The liquid storage tank (11) is provided with an in-tank heat exchanger (113), the in-tank heat exchanger (113) has an inlet communicated with the outlet of the electricity generating component (12), and an outlet communicated with the B port (42).

2. The energy-saving air conditioning system according to claim 1, wherein: The in-tank heat exchanger (113) comprises a base plate (1131) and heat exchange pipes (1132), the base plate (1131) is fixed to the inner wall of the liquid storage tank (11), and the heat exchange pipes (1132) are fixed to the base plate (1131); the heat exchange pipes (1132) are arranged in a ring shape, and the ring-shaped heat exchange pipes (1132) are arranged in multiple layers on the base plate (1131); the heat exchange pipes (1132) have a heat pipe inlet and a heat pipe outlet, the heat pipe inlet is communicated with the outlet of the electricity generating component (12), and the heat pipe outlet is communicated with the B port (42).

3. The energy-saving air conditioning system according to claim 2, wherein: ​ The heat exchange pipe (1132) is provided with a flow guide plate (114) in the middle, the flow guide plate (114) comprises a bottom plate (1141) and a flow guide part (1142), the bottom plate (1141) is fixed at the bottom of the heat exchange pipe (1132), the flow guide part (1142) is arranged in the middle of the bottom plate (1141) and protrudes from the middle of the annular heat exchange pipe (1132) to the base plate (1131), and the cross section of the flow guide part (1142) is circular or polygonal.

4. The energy-saving air conditioning system according to any one of claims 1-3, characterized in that: The power generation component (12) is a hydraulic motor, the hydraulic motor comprises a shell (120), a motor gear set (121), a speed reducer (122) and a generator, the motor gear set (121) and the speed reducer (122) are arranged in the shell (120), and the speed reducer (122) is arranged outside the shell (120); the gas or liquid with high pressure energy in the liquid storage tank (11) enters the shell (120) to drive the motor gear set (121) to rotate, the motor gear set (121) drives the speed reducer (122) to rotate, and the speed reducer (122) drives the generator to rotate to generate electricity.

5. The energy-saving air conditioning system according to any one of claims 1-3, characterized in that: The power storage component (13) comprises a base (133), a protective cover (131) and a battery pack (132), the battery pack (132) is fixed on the base (133), the protective cover (131) is arranged on the base (133) and completely covers the battery pack (132), and the battery pack (132) is electrically connected with the power generation component (12); The base (133) is provided with a mounting groove (1331), the mounting groove (1331) is matched with the shape of the bottom of the protective cover (131), and the mounting groove (1331) is provided with annular sealing rubber (1332).

6. A method of recovering waste heat from an air conditioning system, characterized by: The method is implemented by using the energy-saving air conditioning system according to any one of claims 1-5.

7. The air conditioning system waste heat recovery method of claim 6, wherein: The method comprises the following steps: The high-temperature and high-pressure refrigerant is introduced into the liquid storage tank (11), and whether the pressure and liquid level of the liquid storage tank (11) reach the preset value is judged; if yes, the power generation component (12) is started, and if not, the refrigerant is continuously introduced into the liquid storage tank (11); The refrigerant in the liquid storage tank (11) enters the power generation component (12) to work, becomes low-temperature and low-pressure refrigerant after the pressure and temperature are reduced, and flows back to the tank-in heat exchanger (113) to exchange heat in the tank-in heat exchanger (113); The refrigerant after heat exchange in the tank-in heat exchanger (113) enters the outdoor heat exchanger (2) to participate in the refrigeration cycle.

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