Heat recovery energy storage heat management system based on air flotation centrifugal compressor

Abstract

The invention provides a heat recovery and energy storage heat management system based on an air flotation centrifugal compressor, and the system comprises a refrigeration loop which comprises the air flotation centrifugal compressor, an electric three-way valve, a condenser, a fan, a liquid storage device, a throttling element, an evaporator and an economizer; the cooling liquid loop comprises a cooling water pump, an evaporator, an expansion water tank, a battery pack and a PTC heater; and the heat recovery loop comprises a heat recovery water pump, a heat recovery plate heat exchanger, a user side and a heat storage water tank. According to the heat recovery energy storage heat management system based on the air flotation centrifugal compressor, the refrigerating circuit can be freely switched between a single refrigerating mode and a total heat recovery mode, waste of condensation waste heat in a traditional system is avoided, hot water can be prepared while heat management is conducted on the battery pack, and energy conservation and consumption reduction are achieved; and the heat storage water tank is arranged in the system, so that high-temperature hot water can be obtained under the condition that the system does not work or the single-circulation hot water temperature is not high enough, and the energy utilization rate is increased.

Description

Technical Field

[0001] The present invention relates to the technical field of thermal management, and particularly to a thermal recovery energy storage thermal management system based on an air-floating centrifugal compressor. Background Art

[0002] Thermal management refers to the management and control of the temperature of the overall system, discrete components, or their environment, with the aim of maintaining the normal operation of each component or improving its performance or lifespan. Currently, the trend in energy storage systems is to increase the battery capacity and boost the battery rate, making it increasingly important to keep the entire device within an appropriate operating temperature range, which has raised the requirements for the thermal management of the entire system. During the charging and discharging process of energy storage batteries, devices such as battery packs, energy storage inverters, and battery management systems will release a large amount of heat, and their cooling temperatures seriously affect the performance and reliability of the devices. In the market, the basic principle is usually the vapor compression refrigeration cycle, and the heat is released by air cooling or liquid cooling. Coupled with the energy consumed by the compressor, a large amount of heat will be wasted.

[0003] For a thermal management system using liquid cooling, the heat exchange capacity is relatively strong, and the heat exchange temperature difference can be within 3°C. Compared with air cooling, it can significantly improve the lifespan of energy storage batteries. Currently, the more common energy storage containers in the market are 3.5 MWH or 5 MWH, and the required cooling capacity is usually within 100 kw. This small cooling capacity mainly uses scroll compressors. Scroll compressors require oil lubrication, which reduces the reliability of the system; bearings usually use contact bearings, which reduces the service life of the system; and the volume is relatively large, which is not conducive to increasing the battery capacity in a limited space. These are all the disadvantages of scroll compressors.

[0004] Existing energy storage thermal management systems do not recycle and utilize the excess condensation waste heat, resulting in energy waste. Summary of the Invention

[0005] In view of some or all of the problems in the prior art, the present invention provides a thermal recovery energy storage thermal management system based on an air-floating centrifugal compressor, which system includes:

[0006] A refrigeration circuit configured to circulate a refrigerant, the refrigeration circuit including an air-floating centrifugal compressor and a condenser, the air-floating centrifugal compressor being used to compress the refrigerant, and the condenser being used to condense the refrigerant; and

[0007] A heat recovery circuit configured to use the waste heat of the condenser to produce hot water, the heat recovery circuit including a heat recovery plate heat exchanger, and cold water is converted into hot water by completing heat exchange with the refrigerant through the heat recovery plate heat exchanger.

[0008] Further, the thermal recovery energy storage thermal management system based on an air-floating centrifugal compressor further includes:

[0009] A coolant circuit configured to circulate coolant, the coolant circuit including a coolant pump, an evaporator, an expansion tank, a battery pack, and a PTC heater.

[0010] Further, the refrigeration circuit further includes an electric three-way valve, a fan, a liquid receiver, a throttling element, an evaporator, and an economizer;

[0011] The throttling element includes a main throttling element and an auxiliary throttling element;

[0012] In the refrigeration circuit, the output end of the air-floating centrifugal compressor is connected to the input end of the condenser and the first input end of the heat recovery plate heat exchanger through an electric three-way valve. A fan is installed beside the condenser. The output end of the condenser and the first output end of the heat recovery plate heat exchanger are connected to the input end of the liquid receiver. The output end of the liquid receiver is connected to the main path input end of the economizer. The main path output end of the economizer is connected to the input end of the filter. The output end of the filter is connected to the auxiliary path input end of the economizer through the auxiliary throttling element. The output end of the filter is connected to the first input end of the evaporator through the main throttling element. The first output end of the evaporator is connected to the input end of the air-floating centrifugal compressor.

[0013] Further, the refrigeration circuit further includes:

[0014] An exhaust pressure sensor disposed between the air-floating centrifugal compressor and the condenser for detecting the pressure of the refrigerant discharged from the air-floating centrifugal compressor; and / or

[0015] An exhaust temperature sensor disposed between the air-floating centrifugal compressor and the condenser for detecting the temperature of the refrigerant discharged from the air-floating centrifugal compressor; and / or

[0016] An ambient temperature sensor disposed beside the condenser for detecting the ambient temperature of the condenser; and / or

[0017] An economizer temperature sensor disposed at the output end of the economizer for detecting the temperature of the refrigerant discharged from the economizer; and / or

[0018] A make-up gas temperature sensor disposed between the air-floating centrifugal compressor and the economizer for detecting the temperature of the refrigerant entering the make-up gas port of the air-floating centrifugal compressor; and / or

[0019] A make-up gas pressure sensor disposed between the air-floating centrifugal compressor and the economizer for detecting the pressure of the refrigerant entering the make-up gas port of the air-floating centrifugal compressor; and / or

[0020] An intake temperature sensor, which is arranged between the air-floating centrifugal compressor and the evaporator, and is used to detect the temperature of the refrigerant entering the air-floating centrifugal compressor after cooling heat exchange; and / or

[0021] An intake pressure sensor, which is arranged between the air-floating centrifugal compressor and the evaporator, and is used to detect the pressure of the refrigerant entering the air-floating centrifugal compressor after cooling heat exchange.

[0022] Further, in the coolant circuit, the second output end of the evaporator is connected to the input end of the PTC heater, the output end of the PTC heater is connected to the input end of the battery pack, the output end of the battery pack is connected to the input end of the cooling water pump, the output end of the cooling water pump is connected to the second input end of the evaporator, and the expansion tank is arranged between the second output end of the evaporator and the output end of the battery pack.

[0023] Further, the coolant circuit further includes:

[0024] A return water pressure sensor, which is arranged between the output end of the battery pack and the input end of the cooling water pump, and is used to detect the pressure of the coolant entering the cooling water pump; and / or

[0025] A return water temperature sensor, which is arranged between the output end of the battery pack and the input end of the cooling water pump, and is used to detect the temperature of the coolant entering the cooling water pump; and / or

[0026] An outlet water pressure sensor, which is arranged between the output end of the PTC heater and the input end of the battery pack, and is used to detect the pressure of the coolant output from the PTC heater; and / or

[0027] An outlet water temperature sensor, which is arranged between the output end of the PTC heater and the input end of the battery pack, and is used to detect the temperature of the coolant output from the PTC heater.

[0028] Further, the heat recovery circuit further includes a heat recovery water pump, a user side and a hot water storage tank;

[0029] In the heat recovery circuit, the output end of the heat recovery water pump is connected to the input end of the hot water storage tank, the output end of the hot water storage tank is connected to the input end of the user side, the output end of the user side is connected to the second input end of the heat recovery plate heat exchanger, and the second output end of the heat recovery plate heat exchanger is connected to the input end of the heat recovery water pump.

[0030] Further, the heat recovery circuit further includes:

[0031] A hot recovery outlet temperature sensor is arranged between the second output end of the hot recovery plate heat exchanger and the input end of the hot recovery water pump, and is used for detecting the temperature of the liquid output by the hot recovery plate heat exchanger; and / or

[0032] A hot recovery return water temperature sensor is arranged between the output end of the user side and the second input end of the hot recovery plate heat exchanger, and is used for detecting the temperature of the liquid input into the hot recovery plate heat exchanger.

[0033] Furthermore, the heat recovery energy storage thermal management system based on an air-floating centrifugal compressor further includes:

[0034] A central control module, which is configured to integrally control the driving of the air-floating centrifugal compressor, the driving of the cooling water pump, the driving of the hot recovery water pump, the driving of the fan, the driving of the throttling element, the driving of the sensor, and the driving of the PTC heater.

[0035] Furthermore, the central control module is configured to communicate through one or more of the following:

[0036] Pulse width modulation signal, controller area network bus signal, 4-20mA analog signal, RS485 signal, and 0-10V analog signal.

[0037] The technical solution provided by the present invention has the following beneficial effects:

[0038] 1. The heat recovery energy storage thermal management system based on an air-floating centrifugal compressor provided by the present invention uses an air-floating centrifugal compressor, which does not require oil return, has high reliability; during operation, there is no physical contact and no friction between the bearing and the motor, and it has a long service life; the compressor is supplemented with air in the middle, which can increase the pressure ratio, reduce the power consumption of the compressor, and improve the system performance; the closed impeller + side seal of the wheel cover reduces leakage and return loss, and improves the pneumatic efficiency of the compressor; the back-to-back impeller design reduces the axial thrust; the compressor uses a high-speed permanent magnet synchronous motor, which has a large power density and is smaller in volume and mass compared with a scroll compressor.

[0039] 2. The heat recovery energy storage thermal management system based on an air-floating centrifugal compressor provided by the present invention, the fan in the refrigeration circuit is a high-power high-voltage brushless DC electronic fan, which has a high back pressure, a large air volume, a long service life without maintenance, and the protection level can reach IP68.

[0040] 3. The heat recovery energy storage thermal management system based on an air-floating centrifugal compressor provided by the present invention, the cooling water pump in the coolant circuit is a high-voltage shielded electronic water pump, which is small in volume, high in efficiency, long in service life, maintenance-free, has a stable output flow, and is safer and more reliable to use.

[0041] 4. The heat recovery energy storage thermal management system based on an air - floating centrifugal compressor provided by the present invention has a heat recovery plate heat exchanger in the heat recovery circuit, which is a micro - channel heat exchanger. It has a larger heat exchange area with the same volume, saving the space occupied by the liquid - cooling unit in the energy storage system and helping the energy storage system achieve a higher energy density.

[0042] 5. The heat recovery energy storage thermal management system based on an air - floating centrifugal compressor provided by the present invention can freely switch between the single - refrigeration and full - heat - recovery modes in the refrigeration circuit, avoiding the waste of condensation waste heat in traditional systems. It can produce hot water while managing the heat of the battery pack, saving energy and reducing consumption. And a hot - water storage tank is equipped in the system, which can obtain high - temperature hot water even when the system is not working or the hot - water temperature in a single cycle is not high enough, improving the energy utilization rate.

[0043] 6. The heat recovery energy storage thermal management system based on an air - floating centrifugal compressor provided by the present invention uses a central control module, which can accurately control the reasonable and efficient operation of each system component in the energy storage thermal management system, and better exert the performance of the energy storage thermal management system. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] To further clarify the above and other advantages and features of the embodiments of the present invention, a more specific description of the embodiments of the present invention will be presented with reference to the accompanying drawings. It can be understood that these drawings only depict typical embodiments of the present invention and will not be considered as limiting its scope. In the drawings, for clarity, the same or corresponding components will be denoted by the same or similar reference numerals.

[0045] Figure 1 FIG. shows a schematic framework diagram of a heat recovery energy storage thermal management system based on an air - floating centrifugal compressor according to an embodiment of the present invention;

[0046] Figure 2 FIG. shows an external structure schematic diagram of a high - speed air - floating centrifugal compressor according to an embodiment of the present invention;

[0047] Figure 3 FIG. shows an internal structure schematic diagram of a high - speed air - floating centrifugal compressor according to an embodiment of the present invention;

[0048] Figure 4 FIG. shows a partial schematic diagram of the internal structure of a high - speed air - floating centrifugal compressor according to an embodiment of the present invention; and

[0049] Figure 5 FIG. shows a control framework schematic diagram of a heat recovery energy storage thermal management system based on an air - floating centrifugal compressor according to an embodiment of the present invention.

[0050] LIST OF REFERENCE NUMERALS

[0051] 101 Air flotation centrifugal compressor, 102 Electric three-way valve, 103 Condenser, 104 Fan, 105 Liquid receiver, 106 Economizer, 107 Filter, 108 Auxiliary throttling element, 109 Main throttling element, 110 Exhaust pressure sensor, 111 Exhaust temperature sensor, 112 Ambient temperature sensor, 113 Economizer temperature sensor, 114 Make-up air temperature sensor, 115 Suction temperature sensor, 116 Suction pressure sensor;

[0052] 201 Cooling water pump, 202 Evaporator, 203 PTC heater, 204 Battery pack, 205 Expansion tank, 206 Return water pressure sensor, 207 Return water temperature sensor, 208 Outlet water pressure sensor, 209 Outlet water temperature sensor;

[0053] 301 Heat recovery water pump, 302 Heat recovery plate heat exchanger, 303 User side, 304 Hot water storage tank, 305 Heat recovery outlet water temperature sensor, 306 Heat recovery return water temperature sensor;

[0054] 1 Intake port, 2 Low-pressure housing, 3 Intermediate make-up air port, 4 High-low pressure connecting pipe, 5 High-pressure housing, 6 Exhaust port, 7 Low-pressure impeller, 8 Low-pressure lock nut, 9 Low-pressure impeller cover seal, 10 Low-pressure end cover, 11 Motor housing, 12 Motor stator, 13 Motor rotor, 14 High-pressure end cover, 15 High-pressure impeller cover seal, 16 High-pressure impeller, 17 High-pressure lock nut, 18 High-pressure side radial bearing, 19 Low-pressure side radial bearing, 20 High-pressure side thrust bearing, 21 Thrust disc, 22 Low-pressure side thrust bearing. Detailed implementation manners

[0055] In the following description, the present invention is described with reference to the embodiments. However, those skilled in the art will recognize that the embodiments can be implemented without one or more of the specific details or in combination with other alternative and / or additional methods, materials, or components. In other cases, well-known structures, materials, or operations are not shown or described in detail to avoid obscuring the inventive points of the present invention. Similarly, for purposes of explanation, specific quantities, materials, and configurations are set forth to provide a thorough understanding of the embodiments of the present invention. However, the present invention is not limited to these specific details. In addition, it should be understood that the embodiments shown in the drawings are illustrative representations and not necessarily drawn to scale.

[0056] In this specification, the reference to "an embodiment" or "the embodiment" means that the specific features, structures, or characteristics described in connection with the embodiment are included in at least one embodiment of the present invention. The phrase "in an embodiment" appearing throughout this specification does not necessarily refer to the same embodiment.

[0057] In this specification, unless otherwise specified, the expressions "arranged on", "arranged above", and "arranged over" do not exclude the existence of an intermediate member therebetween. In addition, the expression "arranged on or above" only represents the relative positional relationship between two components, and in certain cases, such as after reversing the product direction, it can also be converted to "arranged under or below", and vice versa.

[0058] In this specification, unless otherwise specified, the quantifiers "a" and "one" do not exclude the scenario of multiple elements, and the quantifiers "multiple" and "many" refer to one or more than one element.

[0059] It should be noted that the embodiments of the present invention describe the method steps in a specific order. However, this is only for explaining the specific embodiment and does not limit the sequence of each step. On the contrary, in different embodiments of the present invention, the sequence of each step can be adjusted according to actual requirements.

[0060] In the embodiments of the present invention, the term "main gas path" refers to the gas flow path in which gas enters the compressor through the intake port, is compressed, and then discharged through the exhaust port. The term "high-pressure side" refers to the side with a higher air pressure inside the compressor, that is, the side where the last-stage impeller is located, and the term "low-pressure side" refers to the side inside the compressor relative to the high-pressure side. Under normal circumstances, gas flows from the high-pressure side through the aerostatic bearing to the low-pressure side and then returns to the main gas path.

[0061] In the present invention, high temperature > medium temperature > low temperature, and high pressure > low pressure.

[0062] The following clearly and completely describes the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention.

[0063] The present invention provides a heat recovery energy storage thermal management system based on an aerostatic centrifugal compressor in an embodiment. The system includes a refrigeration circuit, a coolant circuit, and a heat recovery circuit. The refrigeration circuit is configured to circulate a refrigerant. The refrigeration circuit includes an aerostatic centrifugal compressor and a condenser. The aerostatic centrifugal compressor is used to compress the refrigerant, and the condenser is used to condense the refrigerant. The coolant circuit is configured to circulate a coolant. The coolant circuit includes an evaporator. The high-temperature coolant exchanges heat with the refrigerant through the evaporator and is converted into low-temperature coolant. The heat recovery circuit is configured to use the waste heat of the condenser to produce hot water. The heat recovery circuit includes a heat recovery plate heat exchanger. Cold water completes heat exchange with the refrigerant through the heat recovery plate heat exchanger and is converted into hot water. As Figure 1As shown, the refrigeration circuit may include an air-bearing centrifugal compressor 101, an electric three-way valve 102, a condenser 103, a fan 104, a liquid receiver 105, an economizer 106, a filter 107, an evaporator 202, a throttling element, and various sensors; the coolant circuit may include a cooling water pump 201, an evaporator 202, a PTC (Positive Temperature Coefficient) heater 203, a battery pack 204, an expansion tank 205, and various sensors; the heat recovery circuit may include a heat recovery water pump 301, a heat recovery plate heat exchanger 302, a user side 303, a hot water storage tank 304, and a temperature sensor. In an embodiment of the present invention, the air-bearing centrifugal compressor 101 may be an ultra-high-speed air-bearing centrifugal compressor.

[0064] The main function of the electric three-way valve 102 is to switch between the refrigeration mode and the heat recovery mode. Under normal circumstances, the electric three-way valve 102 points to the condenser 103, where the high-pressure refrigerant discharged by the air-bearing centrifugal compressor 101 releases heat to the environment; when the electric three-way valve 102 points to the heat recovery plate heat exchanger 302, the system turns on the full heat recovery mode, and the user side 303 can output hot water accordingly. There is also a hot water storage tank 304 in the circuit, so that high-temperature hot water can be obtained even when the system is not working or the hot water temperature in a single cycle is not high enough; the electric three-way valve 102 can adjust the proportion, and at this time the system turns on the partial refrigeration mode and the partial heat recovery mode, and the condenser 103 and the heat recovery plate heat exchanger 302 work simultaneously.

[0065] As Figure 1As shown, the throttling element includes a main throttling element 109 and an auxiliary throttling element 108. In the refrigeration circuit, the output end of the air-floating centrifugal compressor 101 is connected to the input end of the condenser 103 and the first input end of the heat recovery plate heat exchanger 302 through an electric three-way valve 102. An exhaust pressure sensor 110 and an exhaust temperature sensor 111 are arranged between the air-floating centrifugal compressor 101 and the condenser 103 for detecting the pressure and temperature of the refrigerant discharged from the air-floating centrifugal compressor. A blower 104 is installed beside the condenser 103, and an ambient temperature sensor 112 is arranged beside the condenser 103 for detecting the ambient temperature of the condenser 103. The output end of the condenser 103 and the first output end of the heat recovery plate heat exchanger 302 are connected to the input end of the liquid receiver 105. The output end of the liquid receiver 105 is connected to the main path input end of the economizer 106. The main path output end of the economizer 106 is connected to the input end of the filter 107. The output end of the filter 107 is connected to the auxiliary path input end of the economizer 106 through the auxiliary throttling element 108. An economizer temperature sensor 113 is arranged at the output end of the economizer 106 for detecting the temperature of the refrigerant discharged from the economizer 106. A supplementary gas temperature sensor 114 is arranged between the air-floating centrifugal compressor 101 and the economizer 106 for detecting the temperature of the refrigerant entering the supplementary gas inlet of the air-floating centrifugal compressor 101. The output end of the filter 107 is connected to the first input end of the evaporator 202 through the main throttling element 109. The first output end of the evaporator 202 is connected to the input end of the air-floating centrifugal compressor 101. An intake temperature sensor 115 and an intake pressure sensor 116 are arranged between the air-floating centrifugal compressor 101 and the evaporator 202 for detecting the temperature and pressure of the refrigerant entering the air-floating centrifugal compressor after cooling and heat exchange. In an embodiment of the present invention, the refrigeration circuit further includes a supplementary gas pressure sensor arranged between the air-floating centrifugal compressor and the economizer for detecting the pressure of the refrigerant entering the supplementary gas inlet of the air-floating centrifugal compressor. In an embodiment of the present invention, the blower 104 in the refrigeration circuit can be a high-power high-voltage brushless DC electronic fan with high back pressure, large air volume, long service life and no need for maintenance, and the protection level can reach IP68. In an embodiment of the present invention, the throttling element can be an electronic expansion valve.

[0066] In the refrigeration circuit, the air-floating centrifugal compressor 101 is the main power component of this circuit. The low-temperature, low-pressure, superheated refrigerant vapor coming out of the evaporator 202 is converted into high-temperature, high-pressure refrigerant vapor after doing work by the air-floating centrifugal compressor 101, and then flows into the condenser 103. The blower 104 is used for forced convection to condense the refrigerant into high-temperature, high-pressure subcooled refrigerant liquid. Then, after passing through the liquid receiver 105 and the throttling element, the refrigerant becomes a low-temperature, low-pressure two-phase state, and then enters the evaporator 202 to complete the evaporation process, and finally returns to the air-floating centrifugal compressor 101 to complete the cycle of the circuit.

[0067] AsFigure 1 As shown, in the coolant circuit, the second output end of the evaporator 202 is connected to the input end of the PTC heater 203, the output end of the PTC heater 203 is connected to the input end of the battery pack 204, and the outlet water pressure sensor 208 and the outlet water temperature sensor 209 are arranged between the output end of the PTC heater 203 and the input end of the battery pack 204 for detecting the pressure and temperature of the coolant output from the PTC heater 203; the output end of the battery pack 204 is connected to the input end of the cooling water pump 201, the output end of the cooling water pump 201 is connected to the second input end of the evaporator 202, the expansion tank 205 is arranged between the second output end of the evaporator 202 and the output end of the battery pack, and the return water pressure sensor 206 and the return water temperature sensor 207 are arranged between the output end of the battery pack 204 and the input end of the cooling water pump 201 for detecting the pressure and temperature of the coolant input into the cooling water pump 201. In an embodiment of the present invention, the cooling water pump in the coolant circuit can be a high-pressure shielded electronic water pump, which has a small volume, high efficiency, long service life, requires no maintenance, has a stable output flow, and is safer and more reliable to use. The main function of the expansion tank 205 is to ensure that the coolant pipeline can maintain a constant water pressure and play a buffering role when the volume of the coolant in the system changes at too high or too low ambient temperatures.

[0068] In the coolant circuit, the cooling water pump 201 is the main power component of this circuit. The high-temperature coolant returned from the battery pack 204 exchanges heat with the refrigerant through the evaporator 202 and is converted into low-temperature coolant, and finally returns to the battery pack 204 to provide the necessary cooling capacity to maintain a suitable working temperature for the battery pack 204. A PTC heater is also provided in this circuit, which has a simple structure and can provide heat for the battery pack in cold winter weather and avoid the coolant from freezing at the same time.

[0069] As Figure 1As shown, in the heat recovery loop, the output end of the heat recovery water pump 301 is connected to the input end of the hot water storage tank 304, the output end of the hot water storage tank 304 is connected to the input end of the user side 303, the output end of the user side 303 is connected to the second input end of the heat recovery plate heat exchanger 302, and the second output end of the heat recovery plate heat exchanger 302 is connected to the input end of the heat recovery water pump 301. The heat recovery outlet temperature sensor 305 is arranged between the second output end of the heat recovery plate heat exchanger 302 and the input end of the heat recovery water pump 301 for detecting the temperature of the liquid output by the heat recovery plate heat exchanger 302; the heat recovery return water temperature sensor 306 is arranged between the output end of the user side 303 and the second input end of the heat recovery plate heat exchanger 302 for detecting the temperature of the liquid input into the heat recovery plate heat exchanger 302. In an embodiment of the present invention, the heat recovery plate heat exchanger in the heat recovery loop can be a microchannel heat exchanger, which has a larger heat exchange area with the same volume, saves the space occupied by the liquid cooling unit in the energy storage system, and helps the energy storage system achieve a higher energy density.

[0070] In the heat recovery loop, the heat recovery water pump 301 is the main power component of this loop. When hot water is needed on the user side 303, the refrigerant cycle opens the electric three-way valve 102, and the bypass refrigerant directly flows through the heat recovery plate heat exchanger 302. The cold water on the user side 303 completes heat exchange with the high-temperature refrigerant through the heat recovery plate heat exchanger 302 and is converted into hot water and stored in the hot water storage tank 304. The hot water storage tank 304 can play a buffering role between the system and the user side, store the heat when hot water is not needed on the user side, and use it when needed.

[0071] As Figure 2 、 3 As shown, the air-floating centrifugal compressor 101 includes: an air inlet 1, a low-pressure housing 2, an inter-stage air supply port 3, a high-low pressure connecting pipe 4, a high-pressure housing 5, an exhaust port 6, a low-pressure impeller 7, a low-pressure locking nut 8, a low-pressure wheel cover seal 9, a low-pressure end cover 10, a motor housing 11, a motor stator 12, a motor rotor 13, a high-pressure end cover 14, a high-pressure wheel cover seal 15, a high-pressure impeller 16, a high-pressure locking nut 17, a high-pressure side radial bearing 18, a low-pressure side radial bearing 19, a high-pressure side thrust bearing 20, a thrust disk 21, and a low-pressure side thrust bearing 22.

[0072] The air-floating centrifugal compressor 101 includes a motor, and the motor includes a motor housing and a motor rotor. As Figure 3As shown in the figure, a high-pressure side radial bearing and a low-pressure side radial bearing are provided on the motor rotor. A thrust disk is provided at the end of the motor rotor, and a thrust bearing is provided on one or both sides of the thrust disk. At both ends inside the motor housing, a first chamber and a second chamber are respectively provided. Both the high-pressure side radial bearing and the low-pressure side radial bearing are aerostatic bearings. Among them, the air inlet of the first chamber is communicated with the air inlet of the compressor. It can also be understood that the air inlet is the air inlet of the first chamber. A low-pressure impeller is provided inside the first chamber, and the low-pressure impeller is fixed to the first end of the motor rotor. A high-low pressure connecting pipe is provided between the first chamber and the second chamber. After the gas compressed by the low-pressure impeller flows out from the air outlet of the first chamber and enters the high-low pressure connecting pipe, it enters the second chamber through the air inlet of the second chamber. A high-pressure impeller is provided inside the second chamber, and the high-pressure impeller is fixed to the second end of the motor rotor. Most of the gas compressed by the high-pressure impeller flows out from the air outlet of the second chamber, and the air outlet of the second chamber is communicated with the exhaust port of the compressor. It can also be understood that the exhaust port is the air outlet of the second chamber. As Figure 3 shown, in the embodiment of the present invention, a low-pressure end cover and a high-pressure end cover are respectively provided at the air outlets of the first chamber and the second chamber. There is a gap between the low-pressure end cover and the high-pressure end cover and the motor rotor. At the same time, there is a certain gap between the low-pressure end cover and the low-pressure impeller. The gas flowing through the aerostatic bearing can return to the main gas path through this gap. There is also a certain gap between the high-pressure end cover and the high-pressure impeller. Under the action of pressure, a part of the gas compressed by the high-pressure impeller can enter the aerostatic bearing through this gap.

[0073] The mechanism of the aerostatic centrifugal compressor 101 in the refrigeration mode is as follows: The low-temperature and low-pressure refrigerant gas from the evaporator enters the compressor through the air inlet, is compressed and does work by the low-pressure impeller and enters the low-pressure housing, then enters the high-pressure impeller through the high-low pressure connecting pipe for further compression and enters the high-pressure housing, and finally the high-temperature and high-pressure refrigerant gas is discharged into the condenser through the exhaust port. An inter-stage air supplement port is provided on the high-low pressure connecting pipe, and exhaust gas from the outside can be connected to cool the exhaust gas of the low-pressure impeller, reduce the compression power consumption of the high-pressure impeller, and thus improve the efficiency of the system.

[0074] Both the high-pressure impeller and the low-pressure impeller adopt closed impellers. Compared with open impellers, the secondary flow from the pressure surface to the suction surface of the blade caused by the tip clearance is eliminated, effectively improving the aerodynamic efficiency of the compressor. And sealing structures are provided on the shroud side of both the high-pressure impeller and the low-pressure impeller, which can significantly reduce the backflow effect from the impeller outlet to the inlet, and can further improve the compressor efficiency.

[0075] The high-pressure impeller and the low-pressure impeller adopt a back-to-back design method. The axial thrust directions of the impellers on the high-pressure and low-pressure sides are opposite and cancel each other out, which can effectively reduce the axial thrust received by the thrust bearing. The position of the thrust bearing is as Figure 4As shown, there is a thrust bearing on each side of the thrust disk, which can thus bear the axial thrust pointing to the low-pressure side or the high-pressure side.

[0076] When the motor rotating shaft rotates, the low-pressure side radial bearing and the high-pressure side radial bearing suck in refrigerant gas to form an air film to support the high-speed rotation of the rotor. There is no contact between the motor rotating shaft and the bearings, the bearings have almost no wear, and the mechanical loss and noise are very small. At the same time, the thrust bearing also forms an air film to bear the axial thrust. The thrust bearing and the radial bearing in the present invention are hydrodynamic gas-lubricated bearings, and the bearing air supply is realized through Figure 3 the internal circulation shown: the exhaust gas of the high-pressure impeller passes through the gap between the high-pressure impeller and the high-pressure end cover, then enters the high-pressure side radial bearing through the gap between the high-pressure end cover and the rotating shaft, then enters the low-pressure side radial bearing through the air gap between the motor stator and the motor rotor, and then passes through the two thrust bearings in sequence through the gap between the thrust disk and the motor housing and the gap between the thrust disk and the low-pressure end cover, and finally passes through the gap between the low-pressure end cover and the rotating shaft and the gap between the low-pressure impeller and the low-pressure end cover in sequence to enter the exhaust port of the low-pressure impeller and return to the main gas path, and passes through the low-pressure housing, the high-low pressure connecting pipe, and the high-pressure impeller in sequence to realize the internal circulation. Compared with the hydrostatic gas-lubricated bearing, the present invention omits the external air supply channel, simplifies the system structure, and improves the reliability.

[0077] The air-lubricated centrifugal compressor of the present invention uses a high-speed permanent magnet synchronous motor. Since the air bearing is a non-contact bearing during operation and can bear a higher rotational speed than a conventional bearing, according to the compressor Euler formula Δh = U2Cu2 - U1Cu1, for compressors with the same work capacity, the greater the rotational speed, the smaller the radial dimension. Therefore, the permanent magnet synchronous motor improves the power density of the compressor.

[0078] The air-lubricated centrifugal compressor used in the present invention does not require oil return, and has high reliability; there is no physical contact and no friction between the bearings and the motor during operation, and it has a long service life; the compressor is supplemented with air in the middle, which can increase the pressure ratio, reduce the power consumption of the compressor, and improve the system performance; the closed impeller + shroud side seal reduces the leakage and return loss, and improves the aerodynamic efficiency of the compressor; the back-to-back impeller design reduces the axial thrust; the compressor uses a high-speed permanent magnet synchronous motor, which has a large power density, and its volume and mass are smaller than those of a scroll compressor.

[0079] Figure 5 The schematic diagram of the control framework of the heat recovery energy storage thermal management system based on the air-lubricated centrifugal compressor according to an embodiment of the present invention is shown. In an embodiment of the present invention, the heat recovery energy storage thermal management system based on the air-lubricated centrifugal compressor further includes a central control module. As Figure 5 shown, the heat recovery energy storage thermal management system based on the air-lubricated centrifugal compressor performs integrated control on the system through a central control module (CCU, Central Control Unit).

[0080] The central control module is configured to control the driving of the air-floating centrifugal compressor 101, the driving of the cooling water pump 201, the driving of the heat recovery water pump 301, the driving of the fan 104, the driving of the main throttle element 109 and the auxiliary throttle element 108, the driving of various sensors, and the driving of the PTC heater 203, etc.

[0081] In one embodiment of the present invention, the communication modes between the components of the energy storage thermal management system and the central control module can be one or more of the following: Pulse Width Modulation (PWM) signal, Controller Area Network (CAN) signal, 4-20mA analog signal, RS485 signal, and 0-10V analog signal.

[0082] The thermal recovery energy storage thermal management system based on the air-floating centrifugal compressor provided by the present invention can freely switch the refrigeration circuit between the single refrigeration mode and the full heat recovery mode, avoiding the waste of condensation waste heat in the traditional system, and can produce hot water while managing the thermal management of the battery pack, saving energy and reducing consumption; and a hot water storage tank is equipped in the system, and high-temperature hot water can also be obtained when the system is not working or the hot water temperature of a single cycle is not high enough, improving the energy utilization rate; using the central control module, it can accurately control the reasonable and efficient operation of each system component in the energy storage thermal management system, and better exert the performance of the energy storage thermal management system.

[0083] Although the embodiments of the present invention have been described above, it should be understood that they are presented only as examples and not as limitations. It will be apparent to those skilled in the relevant art that various combinations, variations, and changes can be made without departing from the spirit and scope of the present invention. Therefore, the width and scope of the present invention disclosed herein should not be limited by the above-disclosed exemplary embodiments, but should be defined only by the appended claims and their equivalents.

Claims

1. A heat recovery energy storage thermal management system based on an air floating centrifugal compressor, characterized in that: include: a refrigeration circuit configured to circulate a refrigerant, the refrigeration circuit comprising an air-floating centrifugal compressor and a condenser, the air-floating centrifugal compressor being used to compress the refrigerant, and the condenser being used to condense the refrigerant; as well as The heat recovery circuit is configured to use the waste heat of the condenser to produce hot water. The heat recovery circuit includes a heat recovery plate heat exchanger. Cold water completes heat exchange with the refrigerant through the heat recovery plate heat exchanger and is converted into hot water.

2. The heat recovery energy storage thermal management system based on the air floating centrifugal compressor according to claim 1 is characterized in that: Also includes: The coolant circuit is configured to circulate the coolant, and the coolant circuit includes a cooling water pump, an evaporator, an expansion water tank, a battery pack and a PTC heater.

3. The heat recovery energy storage thermal management system based on an air floating centrifugal compressor according to claim 1 is characterized in that: The refrigeration circuit also includes an electric three-way valve, a fan, a liquid storage device, a throttling element, an evaporator and an economizer; The throttling element comprises a main throttling element and an auxiliary throttling element; In the refrigeration circuit, the output end of the air-floating centrifugal compressor is connected to the input end of the condenser and the first input end of the heat recovery plate heat exchanger through an electric three-way valve. A fan is installed next to the condenser. The output end of the condenser and the first output end of the heat recovery plate heat exchanger are connected to the input end of the liquid reservoir. The output end of the liquid reservoir is connected to the main input end of the economizer. The main output end of the economizer is connected to the input end of the filter. The output end of the filter is connected to the auxiliary input end of the economizer through an auxiliary throttling element. The output end of the filter is connected to the first input end of the evaporator through the main throttling element. The first output end of the evaporator is connected to the input end of the air-floating centrifugal compressor.

4. The heat recovery energy storage thermal management system based on an air floating centrifugal compressor according to claim 1 is characterized in that: The refrigeration circuit also includes: an exhaust pressure sensor, which is disposed between the air-floating centrifugal compressor and the condenser and is used to detect the pressure of the refrigerant discharged from the air-floating centrifugal compressor; and / or an exhaust temperature sensor, which is disposed between the air-floating centrifugal compressor and the condenser and is used to detect the temperature of the refrigerant discharged from the air-floating centrifugal compressor; and / or an ambient temperature sensor, disposed next to the condenser, for detecting the ambient temperature of the condenser; and / or an economizer temperature sensor, disposed at an output end of the economizer, for detecting the temperature of the refrigerant discharged from the economizer; and / or a gas supply temperature sensor, which is arranged between the air-floating centrifugal compressor and the economizer, and is used to detect the temperature of the refrigerant entering the gas supply port of the air-floating centrifugal compressor; and / or A gas supply pressure sensor is arranged between the air-floating centrifugal compressor and the economizer, and is used to detect the pressure of the refrigerant entering the gas supply port of the air-floating centrifugal compressor; and / or A suction temperature sensor, which is arranged between the air-floating centrifugal compressor and the evaporator, and is used to detect the temperature of the refrigerant entering the air-floating centrifugal compressor after cooling and heat exchange; and / or The suction pressure sensor is arranged between the air-floating centrifugal compressor and the evaporator, and is used to detect the pressure of the refrigerant entering the air-floating centrifugal compressor after cooling and heat exchange.

5. The heat recovery energy storage thermal management system based on an air floating centrifugal compressor according to claim 2 is characterized in that: In the coolant circuit, the second output end of the evaporator is connected to the input end of the PTC heater, the output end of the PTC heater is connected to the input end of the battery pack, the output end of the battery pack is connected to the input end of the cooling water pump, the output end of the cooling water pump is connected to the second input end of the evaporator, and the expansion water tank is arranged between the second output end of the evaporator and the output end of the battery pack.

6. The heat recovery energy storage thermal management system based on an air floating centrifugal compressor according to claim 2 is characterized in that: The coolant circuit also includes: a return water pressure sensor, which is arranged between the output end of the battery pack and the input end of the cooling water pump, and is used to detect the pressure of the coolant input to the cooling water pump; and / or a return water temperature sensor, which is arranged between the output end of the battery pack and the input end of the cooling water pump, and is used to detect the temperature of the coolant input into the cooling water pump; and / or a water outlet pressure sensor, which is arranged between the output end of the PTC heater and the input end of the battery pack, and is used to detect the pressure of the coolant output from the PTC heater; and / or The water outlet temperature sensor is arranged between the output end of the PTC heater and the input end of the battery pack, and is used to detect the temperature of the coolant output from the PTC heater.

7. The heat recovery energy storage thermal management system based on an air floating centrifugal compressor according to claim 1 is characterized in that: The heat recovery loop also includes a heat recovery water pump, a user side and a hot water storage tank; In the heat recovery loop, the output end of the heat recovery water pump is connected to the input end of the hot water storage tank, the output end of the hot water storage tank is connected to the input end of the user side, the output end of the user side is connected to the second input end of the heat recovery plate heat exchanger, and the second output end of the heat recovery plate heat exchanger is connected to the input end of the heat recovery water pump.

8. The heat recovery energy storage thermal management system based on an air floating centrifugal compressor according to claim 1 is characterized in that: The heat recovery circuit also includes: a heat recovery water outlet temperature sensor, which is arranged between the second output end of the heat recovery plate heat exchanger and the input end of the heat recovery water pump, and is used to detect the temperature of the liquid output by the heat recovery plate heat exchanger; and / or The heat recovery return water temperature sensor is arranged between the output end of the user side and the second input end of the heat recovery plate heat exchanger, and is used to detect the temperature of the liquid input into the heat recovery plate heat exchanger.

9. The heat recovery energy storage thermal management system based on air floating centrifugal compressor according to claim 1 is characterized in that: Also includes: The central control module is configured to integrate and control the driving of the air-floating centrifugal compressor, the driving of the cooling water pump, the driving of the heat recovery water pump, the driving of the fan, the driving of the throttling element, the driving of the sensor and the driving of the PTC heater.

10. The heat recovery energy storage thermal management system based on an air floating centrifugal compressor according to claim 9, characterized in that: The central control module is configured to communicate via one or more of the following: PWM signals, CAN bus signals, 4-20mA analog signals, RS485 signals and 0-10V analog signals.

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