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

Abstract

The utility model provides a heat recovery and energy storage heat management device based on an air flotation centrifugal compressor, which comprises a refrigerating circuit, a heat recovery and energy storage heat management system and a heat recovery and energy storage heat management system, and the refrigerating circuit 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 device 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 device 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 device, high-temperature hot water can be obtained under the condition that the device does not work or the temperature of single-circulation hot water is not high enough, and the energy utilization rate is increased.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of heat management, especially relates to a heat recovery energy storage heat management device based on air float centrifugal compressor. BACKGROUND

[0002] Heat management refers to the management and control of the temperature of the total device, discrete components or their environment, and the purpose is to maintain the normal operation of each component or improve its performance or life. The current trend of energy storage devices is to increase battery capacity and improve battery rate, and it is increasingly important to keep the entire device at a suitable working temperature, which makes the heat management requirements of the entire device higher and higher. During the charging and discharging process of the energy storage battery, the battery pack, energy storage converter, battery management device and other equipment will release a large amount of heat, and the cooling temperature seriously affects the performance and reliability of the equipment. The market usually uses the steam compression refrigeration cycle as the basic principle, and uses air cooling or liquid cooling to release this part of heat, plus the energy consumption of the compressor, a large amount of heat will be wasted.

[0003] The heat management device using liquid cooling has relatively strong heat exchange capacity, and the heat exchange temperature difference can be within 3 DEG C, which can significantly improve the service life of the energy storage battery compared with air cooling. The commonly used energy storage container on the market is 3.5MWH or 5MWH, and the required refrigeration capacity is usually less than 100kw. This small cooling capacity mainly uses scroll compressors. Scroll compressors need oil lubrication, which reduces the reliability of the device; the bearing usually uses a contact bearing, which reduces the service life of the device; the volume is relatively large, which is not conducive to increasing the battery capacity in limited space. These are the shortcomings of scroll compressors.

[0004] The existing energy storage heat management device does not recycle the excess condensing waste heat, which causes energy waste. UTILITY MODEL CONTENTS

[0005] In view of part or all of the problems in the prior art, the utility model provides a heat recovery energy storage heat management device based on air float centrifugal compressor, which comprises:

[0006] A refrigeration circuit configured to circulate refrigerant, the refrigeration circuit comprising an air float centrifugal compressor for compressing refrigerant and a condenser for condensing refrigerant;

[0007] A cooling liquid circuit configured to circulate cooling liquid, the cooling liquid circuit comprising an evaporator through which high-temperature cooling liquid exchanges heat with the refrigerant and is converted into low-temperature cooling liquid; and

[0008] A heat recovery circuit configured to produce hot water using waste heat of the condenser, the heat recovery circuit comprising a heat recovery plate heat exchanger, through which cold water and the refrigerant complete heat exchange and are converted into hot water.

[0009] Further, the refrigeration circuit further comprises an electric three-way valve, a fan, a liquid accumulator, a throttling element, an evaporator and an economizer; and / or

[0010] The cooling liquid circuit further comprises a cooling water pump, an expansion tank, a battery pack and a PTC heater; and / or

[0011] The heat recovery circuit further comprises a heat recovery water pump, a user side and a heat storage water tank.

[0012] Further, the throttling element comprises a main throttling element and an auxiliary throttling element;

[0013] In the refrigeration circuit, the output end of the gas-bearing centrifugal compressor is connected to the input end of the condenser and the first input end of the heat recovery plate heat exchanger through the 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 accumulator, the output end of the liquid accumulator 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, and the first output end of the evaporator is connected to the input end of the gas-bearing centrifugal compressor.

[0014] Further, the refrigeration circuit further comprises:

[0015] An exhaust gas pressure sensor arranged between the gas-bearing centrifugal compressor and the condenser for detecting the pressure of the refrigerant discharged by the gas-bearing centrifugal compressor; and / or

[0016] An exhaust gas temperature sensor arranged between the gas-bearing centrifugal compressor and the condenser for detecting the temperature of the refrigerant discharged by the gas-bearing centrifugal compressor; and / or

[0017] An ambient temperature sensor arranged beside the condenser for detecting the ambient temperature of the condenser; and / or

[0018] An economizer temperature sensor arranged at the output end of the economizer for detecting the temperature of the refrigerant discharged by the economizer; and / or

[0019] A charge gas temperature sensor arranged between the gas-bearing centrifugal compressor and the economizer for detecting the temperature of the refrigerant entering the charge gas inlet of the gas-bearing centrifugal compressor; and / or

[0020] a make-up pressure sensor arranged between the gas-bearing centrifugal compressor and the economizer, for detecting the pressure of the refrigerant entering the make-up port of the gas-bearing centrifugal compressor; and / or

[0021] a suction temperature sensor arranged between the gas-bearing centrifugal compressor and the evaporator, for detecting the temperature of the refrigerant entering the gas-bearing centrifugal compressor after cooling heat exchange; and / or

[0022] a suction pressure sensor arranged between the gas-bearing centrifugal compressor and the evaporator, for detecting the pressure of the refrigerant entering the gas-bearing centrifugal compressor after cooling heat exchange.

[0023] Further, in the cooling liquid 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.

[0024] Further, the cooling liquid circuit further comprises:

[0025] a return water pressure sensor arranged between the output end of the battery pack and the input end of the cooling water pump, for detecting the pressure of the cooling liquid input into the cooling water pump; and / or

[0026] a return water temperature sensor arranged between the output end of the battery pack and the input end of the cooling water pump, for detecting the temperature of the cooling liquid input into the cooling water pump; and / or

[0027] an outlet water pressure sensor arranged between the output end of the PTC heater and the input end of the battery pack, for detecting the pressure of the cooling liquid output from the PTC heater; and / or

[0028] an outlet water temperature sensor arranged between the output end of the PTC heater and the input end of the battery pack, for detecting the temperature of the cooling liquid output from the PTC heater.

[0029] Further, in the heat recovery circuit, the output end of the heat recovery water pump is connected to the input end of the heat storage water tank, the output end of the heat storage water 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 comprises:

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

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

[0033] Further, the heat recovery energy storage heat management device based on the air-floating centrifugal compressor further comprises:

[0034] a central control module configured to integrally 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.

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

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

[0037] The technical scheme provided by the utility model has the following beneficial effects:

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

[0039] 2. The heat recovery energy storage heat management device based on the air-floating centrifugal compressor provided by the utility model, wherein the fan in the refrigeration circuit is a high-power high-pressure brushless direct-current electronic fan, has high back pressure, large air volume, a long service life, and does not need to be maintained, and has a protection level of IP68.

[0040] 3. The heat recovery energy storage heat management device based on the air-floating centrifugal compressor provided by the utility model, wherein the cooling water pump in the cooling liquid circuit is a high-pressure shield electronic water pump, has small volume, high efficiency, a long service life, is maintenance-free, has stable output flow, and is safer and more reliable to use.

[0041] 4. The heat recovery energy storage heat management device based on the air floating centrifugal compressor, the heat recovery plate heat exchanger in the heat recovery circuit is a micro-channel heat exchanger, the heat exchange area is larger with the same volume, the space occupied by the liquid cooling unit in the energy storage device is saved, and the energy storage device can reach a higher energy density.

[0042] 5. The heat recovery energy storage heat management device based on the air floating centrifugal compressor, the refrigeration circuit can be freely switched between single refrigeration and full heat recovery modes, waste of condensation waste heat in the traditional device is avoided, hot water can be prepared while the battery pack is heat managed, energy saving and consumption reduction are achieved, and the device is provided with a heat storage water tank, high-temperature hot water can be obtained in the case that the device does not work or the temperature of single-cycle hot water is not high enough, and the energy utilization rate is improved.

[0043] 6. The heat recovery energy storage heat management device based on the air floating centrifugal compressor, a central control module is used, each device part in the energy storage heat management device can be accurately controlled to rationally and efficiently operate, and the performance of the energy storage heat management device is better. BRIEF DESCRIPTION OF DRAWINGS

[0044] To further illustrate the above and other advantages and characteristics of the embodiments of the present application, a more detailed description of the embodiments of the present application will be presented with reference to the accompanying drawings. It can be understood that these drawings only depict typical embodiments of the present application, and therefore should not be considered as limiting the scope thereof. In the drawings, the same or corresponding parts will be denoted by the same or similar reference numerals for the sake of clarity.

[0045] Figure 1 A frame schematic diagram of the heat recovery energy storage heat management device based on the air floating centrifugal compressor of one embodiment of the present application is shown;

[0046] Figure 2 An external structure schematic diagram of the high-speed air floating centrifugal compressor of one embodiment of the present application is shown;

[0047] Figure 3 An internal structure schematic diagram of the high-speed air floating centrifugal compressor of one embodiment of the present application is shown;

[0048] Figure 4 A partial internal structure schematic diagram of the high-speed air floating centrifugal compressor of one embodiment of the present application is shown; and

[0049] Figure 5 A control frame schematic diagram of the heat recovery energy storage heat management device based on the air floating centrifugal compressor of one embodiment of the present application is shown.

[0050] LIST OF REFERENCE NUMERALS

[0051] 101 gas-bearing centrifugal compressor, 102 electric three-way valve, 103 condenser, 104 fan, 105 liquid accumulator, 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 charge air temperature sensor, 115 intake air temperature sensor, 116 intake air 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 heat storage water tank, 305 heat recovery outlet water temperature sensor, 306 heat recovery return water temperature sensor;

[0054] 1 air inlet, 2 low-pressure pressure shell, 3 inter-stage charge air inlet, 4 high-low pressure connecting pipe, 5 high-pressure pressure shell, 6 exhaust port, 7 low-pressure impeller, 8 low-pressure locking nut, 9 low-pressure cover seal, 10 low-pressure end cover, 11 motor casing, 12 motor stator, 13 motor rotor, 14 high-pressure end cover, 15 high-pressure cover seal, 16 high-pressure impeller, 17 high-pressure locking 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 DESCRIPTION

[0055] In the following description, reference is made to the accompanying drawings which form a part hereof, and in which is shown by way of illustration various embodiments for practicing the present application. It is to be understood that other embodiments can be utilized and structural or

[0056] In this specification, reference to "one embodiment" or "the embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment of the application. The appearances of the phrase "in one embodiment" in various places in the specification are not necessarily all referring to the same embodiment.

[0057] In the present description, unless specifically indicated, "arranged on", "arranged above" and "arranged over" do not exclude the presence of an intermediate between the two. Furthermore, "arranged on or above" merely indicates the relative position between the two components, which in certain cases, such as after reversing the product direction, can also be converted into "arranged below or under", and vice versa.

[0058] In the present description, unless specifically indicated, the quantifier "one", "a" does not exclude the scenario of multiple elements, and the quantifier "multiple", "many" refers to one or more than one element.

[0059] It should be noted that the embodiments of the present application describe the method steps in a specific order, but this is only for the purpose of describing the specific embodiments, and is not limited to the order of the steps. On the contrary, in different embodiments of the present application, the order of the steps can be adjusted according to the actual needs of the adjustment.

[0060] In the embodiments of the present application, the term "main gas path" refers to the gas flow path in which the gas enters the compressor through the gas inlet, is compressed, and is then discharged through the gas outlet. The term "high pressure side" refers to the side of the compressor with higher internal gas pressure, i.e. the side where the last stage impeller is located, and the term "low pressure side" refers to the side of the compressor relative to the high pressure side. Under normal circumstances, the gas flows from the high pressure side to the low pressure side through the gas floating bearing and then returns to the main gas path.

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

[0062] The technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application.

[0063] The present application provides a kind of based on gas floating centrifugal compressor's heat recovery energy storage heat management device.The device includes refrigeration circuit, cooling liquid circuit and heat recovery circuit.Refrigeration circuit, it is configured as flowing refrigerant, the refrigeration circuit includes gas floating centrifugal compressor and condenser, the gas floating centrifugal compressor is used to compress refrigerant, and the condenser is used to condense refrigerant;Cooling liquid circuit, it is configured as flowing cooling liquid, the cooling liquid circuit includes evaporator, high temperature cooling liquid passes through the evaporator and the refrigerant heat exchange, and is converted into low temperature cooling liquid;Heat recovery circuit, it is configured as using the waste heat of condenser to prepare hot water, the heat recovery circuit includes heat recovery plate heat exchanger, and cold water is completed heat exchange by the heat recovery plate heat exchanger and the refrigerant, and is converted into hot water. Figure 1As shown, the refrigeration circuit can include a gas-bearing centrifugal compressor 101, an electric three-way valve 102, a condenser 103, a fan 104, a liquid accumulator 105, an economizer 106, a filter 107, an evaporator 202, a throttling element, and various sensors; the cooling liquid circuit can 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 can include a heat recovery water pump 301, a heat recovery plate heat exchanger 302, a user side 303, a heat storage tank 304, and a temperature sensor. In an embodiment of the present application, the gas-bearing centrifugal compressor 101 can be a super-speed gas-bearing centrifugal compressor.

[0064] The electric three-way valve 102 mainly functions to switch between the refrigeration mode and the heat recovery mode. Normally, the electric three-way valve 102 points to the condenser 103, and the high-pressure refrigerant discharged by the gas-bearing centrifugal compressor 101 releases heat to the environment at this point; the electric three-way valve 102 points to the heat recovery plate heat exchanger 302, the device is turned on in the full heat recovery mode, and the user side 303 can output hot water thereby; a heat storage tank 304 is further provided in the circuit, and high-temperature hot water can be obtained in the case that the device is not working or the single-cycle hot water temperature is not high enough; the electric three-way valve 102 can adjust the proportion, and at this time the device is turned on in 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 shown in FIG. 1, the device comprises a refrigeration circuit, a cooling liquid circuit, and a heat recovery circuit. 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 gas-bearing 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 the electric three-way valve 102, the exhaust pressure sensor 110 and the exhaust temperature sensor 111 are arranged between the gas-bearing centrifugal compressor 101 and the condenser 103, and are used to detect the pressure and temperature of the refrigerant discharged by the gas-bearing centrifugal compressor; The fan 104 is installed beside the condenser 103, and the ambient temperature sensor 112 is arranged beside the condenser 103 and is used to detect 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 accumulator 105, the output end of the liquid accumulator 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, the economizer temperature sensor 113 is arranged at the output end of the economizer 106 and is used to detect the temperature of the refrigerant discharged by the economizer 106, and the supplementary gas temperature sensor 114 is arranged between the gas-bearing centrifugal compressor 101 and the economizer 106 and is used to detect the temperature of the refrigerant entering the gas inlet of the gas-bearing 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 gas-bearing centrifugal compressor 101, and the suction temperature sensor 115 and the suction pressure sensor 116 are arranged between the gas-bearing centrifugal compressor 101 and the evaporator 202 and are used to detect the temperature and pressure of the refrigerant entering the gas-bearing centrifugal compressor after cooling heat exchange. In an embodiment of the utility model, the refrigeration circuit further comprises a supplementary gas pressure sensor, which is arranged between the gas-bearing centrifugal compressor and the economizer and is used to detect the pressure of the refrigerant entering the gas inlet of the gas-bearing centrifugal compressor. In an embodiment of the utility model, the fan 104 in the refrigeration circuit can be a high-power high-voltage brushless direct-current electronic fan, which has high back pressure, large air volume, long service life and does not need maintenance, and the protection level can reach IP68. In an embodiment of the utility model, the throttling element can be an electronic expansion valve.

[0066] In the refrigeration circuit, the gas-bearing centrifugal compressor 101 is the main power component of the circuit, the low-temperature and low-pressure superheated refrigerant vapor from the evaporator 202 is converted into high-temperature and high-pressure refrigerant vapor through the gas-bearing centrifugal compressor 101, and then flows into the condenser 103, the refrigerant is condensed into high-temperature and high-pressure supercooled refrigerant liquid by forced convection of the fan 104, and then passes through the liquid accumulator 105 and the throttling element, the refrigerant becomes low-temperature and low-pressure two-phase state, and then enters the evaporator 202 to complete the evaporation process, and finally returns to the gas-bearing centrifugal compressor 101 to complete the cycle of the circuit.

[0067] AsFigure 1 As shown, in the cooling liquid circuit, the second output end of the evaporator 202 is connected with the input end of the PTC heater 203, the output end of the PTC heater 203 is connected with the input end of the battery pack 204, 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, and are used for detecting the pressure and the temperature of the cooling liquid output from the PTC heater 203; the output end of the battery pack 204 is connected with the input end of the cooling water pump 201, the output end of the cooling water pump 201 is connected with the second input end of the evaporator 202, the expansion water 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, and are used for detecting the pressure and the temperature of the cooling liquid input into the cooling water pump 201. In an embodiment of the utility model, the cooling water pump in the cooling liquid circuit can be a high-pressure shield electronic water pump, which is small in size, high in efficiency, long in service life, maintenance-free, stable in output flow and safe and reliable in use. The expansion water tank 205 mainly functions to ensure that the cooling liquid pipeline can keep the water pressure constant, and plays a buffering role when the cooling liquid volume in the device changes when the ambient temperature is too high or too low.

[0068] In the cooling liquid circuit, the cooling water pump 201 is the main power component of the circuit, the high-temperature cooling liquid returned from the battery pack 204 is converted into low-temperature cooling liquid through the evaporator 202 and the refrigerant heat exchange, and finally returns to the battery pack 204, so as to provide the necessary cold energy for the battery pack 204 to maintain the appropriate working temperature. The PTC heater is also arranged in the circuit, which is simple in structure, can provide heat for the battery pack in winter cold weather, and can avoid freezing of the cooling liquid.

[0069] As Figure 1As shown, in the heat recovery circuit, the output end of the heat recovery water pump 301 is connected to the input end of the heat storage water tank 304, the output end of the heat storage water 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 water 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, and is used to detect 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, and is used to detect the temperature of the liquid input into the heat recovery plate heat exchanger 302. In an embodiment of the utility model, the heat recovery plate heat exchanger in the heat recovery circuit can be a micro-channel heat exchanger, which has a larger heat exchange area in the same volume, saves the space occupied by the liquid cooling unit in the energy storage device, and helps the energy storage device to achieve a higher energy density.

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

[0071] As shown in Figure 2 , 3 The gas floating centrifugal compression 101 comprises: an air inlet 1, a low-pressure pressure shell 2, an inter-stage air supplement port 3, a high-low pressure connecting pipe 4, a high-pressure pressure shell 5, an air outlet 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 shell 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 disc 21, and a low-pressure side thrust bearing 22.

[0072] The gas floating centrifugal compression 101 comprises a motor, and the motor comprises a motor shell and a motor rotor. As shown in Figure 3As shown, the motor rotor is equipped with high-pressure radial bearings and low-pressure radial bearings. A thrust disc is located at the end of the motor rotor, and thrust bearings are located on one or both sides of the thrust disc. The motor housing has a first chamber and a second chamber at its two ends. Both the high-pressure and low-pressure radial bearings are air-bearing bearings. The inlet of the first chamber is connected to the inlet of the compressor; in other words, the inlet is the inlet of the first chamber. A low-pressure impeller is located in the first chamber and fixed to the first end of the motor rotor. A high-low pressure connecting pipe is provided between the first and second chambers. Gas compressed by the low-pressure impeller flows out of the outlet of the first chamber, enters the high-low pressure connecting pipe, and then enters the second chamber through the inlet of the second chamber. A high-pressure impeller is installed in the second chamber, fixed to the second end of the motor rotor. Most of the gas compressed by the high-pressure impeller flows out from the outlet of the second chamber. The outlet of the second chamber is connected to the exhaust port of the compressor; in other words, the exhaust port is the outlet of the second chamber. Figure 3 As shown in the embodiment of this utility model, a low-pressure end cover and a high-pressure end cover are respectively provided at the air outlet 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 air bearing can return to the main air circuit through this gap. There is also a certain gap between the high-pressure end cover and the high-pressure impeller. A part of the gas compressed by the high-pressure impeller can enter the air bearing through this gap under pressure.

[0073] The mechanism of the air-float centrifugal compressor 101 in refrigeration mode is as follows: Low-temperature, low-pressure refrigerant gas from the evaporator enters the compressor through the inlet, is compressed by the low-pressure impeller, and enters the low-pressure casing. Then, it passes through the high-low pressure connecting pipe to the high-pressure impeller for further compression and enters the high-pressure casing. Finally, the high-temperature, high-pressure refrigerant gas is discharged into the condenser through the exhaust port. The high-low pressure connecting pipe is equipped with an interstage gas inlet, which can connect to external exhaust gas to cool the exhaust gas from the low-pressure impeller, reducing the compression power consumption of the high-pressure impeller and thus improving the efficiency of the unit.

[0074] Both high-pressure and low-pressure impellers are closed impellers. Compared to open impellers, this eliminates the secondary flow from the pressure surface to the suction surface of the blades caused by tip clearance, effectively improving the compressor's aerodynamic efficiency. Furthermore, both high-pressure and low-pressure impellers have sealing structures on their impeller covers, which significantly reduces the backflow effect from the impeller outlet to the inlet, further improving compressor efficiency.

[0075] The high-pressure impeller and the low-pressure impeller adopt a back-to-back design, with the axial thrust directions of the impellers on the high and low pressure sides being opposite and canceling each other out. This effectively reduces the axial thrust on the thrust bearing. The thrust bearing position is as follows: Figure 4As shown, there are two thrust bearings on both sides of the thrust disc, which can further bear the axial thrust directed 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 a gas film to support the high-speed rotation of the rotor, and the motor rotating shaft is not in contact with the bearing, so that the bearing is almost not worn, and mechanical loss and noise are very small. Figure 3 As shown, the bearing gas supply is realized by internal circulation: 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 gap between the thrust disc and the motor housing and the gap between the thrust disc and the low-pressure end cover in sequence to pass through the two thrust bearings in sequence, and finally passes through the gap between the low-pressure end cover and the rotating shaft, the gap between the low-pressure impeller and the low-pressure end cover into the low-pressure impeller exhaust port, back to the main gas path, and then through the low-pressure shell, the high-low pressure connecting pipe and the high-pressure impeller to realize internal circulation.

[0077] The gas bearing centrifugal compressor of the utility model adopts a high-speed permanent magnet synchronous motor, and since the air bearing is a non-contact bearing during operation, it can bear a higher rotating speed than a general bearing.

[0078] The gas bearing centrifugal compressor used in the utility model has high reliability without oil return, and the bearing and the motor are not in physical contact during operation, so that there is no friction and the service life is long.

[0079] Figure 5 A control framework schematic diagram of the heat recovery and energy storage heat management device based on the gas bearing centrifugal compressor is shown. Figure 5As shown, the heat recovery energy storage thermal management device based on the air floating centrifugal compressor is integrally controlled by 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 throttling element 109 and the auxiliary throttling element 108, the driving of various sensors, and the driving of the PTC heater 203, etc.

[0081] In an embodiment of the present application, the communication mode between each component of the energy storage thermal management device and the central control module can be one or more of the following: pulse width modulation (PWM) signal, controller area network bus (CAN) signal, 4-20mA analog signal, RS485 signal, and 0-10V analog signal.

[0082] The heat recovery energy storage thermal management device based on the air floating centrifugal compressor provided by the present application can freely switch between single refrigeration and full heat recovery mode in the refrigeration circuit, avoids the waste of condenser waste heat in the traditional device, can produce hot water while managing the battery pack, saves energy and reduces consumption; and the device is provided with a heat storage water tank, so that high-temperature hot water can be obtained when the device is not working or the single-cycle hot water temperature is not high enough, improving the energy utilization rate; the use of the central control module can accurately control the reasonable and efficient operation of each device component in the energy storage thermal management device, and better play the performance of the energy storage thermal management device.

[0083] Although the above describes the embodiments of the present application, it should be understood that they are only presented as examples, not as limitations. It is obvious to those skilled in the art that various combinations, modifications and changes can be made without departing from the spirit and scope of the present application. Therefore, the width and scope of the present application disclosed herein should not be limited by the above disclosed exemplary embodiments, but should only be defined according to the appended claims and their equivalent replacements.

Claims

1. A heat recovery energy storage thermal management device based on an air-float centrifugal compressor, characterized in that, include: A refrigeration circuit configured to circulate refrigerant, the refrigeration circuit including an air-float centrifugal compressor for compressing the refrigerant and a condenser for condensing the refrigerant; A coolant circuit is configured to allow coolant to circulate. The coolant circuit includes an evaporator, through which high-temperature coolant exchanges heat with the refrigerant and is converted into low-temperature coolant. as well as A heat recovery loop is configured to use the waste heat of the condenser to produce hot water. The heat recovery loop includes a heat recovery plate heat exchanger, through which cold water exchanges heat with the refrigerant and is converted into hot water.

2. The heat recovery energy storage thermal management device based on an air-float centrifugal compressor as described in claim 1, characterized in that, The refrigeration circuit also includes an electric three-way valve, a fan, a liquid receiver, a throttling element, an evaporator, and an economizer; and / or The coolant circuit also includes a coolant pump, an expansion tank, a battery pack, and a PTC heater; and / or The heat recovery circuit also includes a heat recovery water pump, a user side, and a hot water storage tank.

3. The heat recovery energy storage thermal management device based on an air-float centrifugal compressor according to claim 1, characterized in that, Throttling elements include main throttling elements and auxiliary throttling elements; In the refrigeration circuit, the output end of the air-float centrifugal compressor is connected to the input end of the condenser and the first input end of the heat recovery plate heat exchanger via 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 receiver. The output end of the liquid receiver 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 via an auxiliary throttling element. The output end of the filter is connected to the first input end of the evaporator via a main throttling element. The first output end of the evaporator is connected to the input end of the air-float centrifugal compressor.

4. The heat recovery energy storage thermal management device based on an air-float centrifugal compressor according to claim 1, characterized in that, The refrigeration circuit also includes: An exhaust pressure sensor, disposed between the air-float centrifugal compressor and the condenser, is used to detect the pressure of the refrigerant discharged from the air-float centrifugal compressor; and / or An exhaust temperature sensor, disposed between the air-float centrifugal compressor and the condenser, is used to detect the temperature of the refrigerant discharged from the air-float centrifugal compressor; and / or An ambient temperature sensor, disposed adjacent to the condenser, is used to detect the ambient temperature of the condenser; and / or An economizer temperature sensor, disposed at the output of the economizer, is used to detect the temperature of the refrigerant discharged from the economizer; and / or A refrigerant temperature sensor, disposed between the air-float centrifugal compressor and the economizer, is used to detect the temperature of the refrigerant entering the air-float centrifugal compressor's refrigerant inlet; and / or A refrigerant pressure sensor is installed between the air-float centrifugal compressor and the economizer to detect the pressure of the refrigerant entering the air-float centrifugal compressor's refrigerant inlet. and / or A suction temperature sensor, disposed between the air-float centrifugal compressor and the evaporator, is used to detect the temperature of the refrigerant entering the air-float centrifugal compressor after cooling and heat exchange; and / or A suction pressure sensor is installed between the air-float centrifugal compressor and the evaporator to detect the pressure of the refrigerant entering the air-float centrifugal compressor after cooling and heat exchange.

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

6. The heat recovery energy storage thermal management device based on an air-float centrifugal compressor according to claim 2, characterized in that, The coolant circuit also includes: A return water pressure sensor, disposed between the output terminal of the battery pack and the input terminal of the cooling water pump, is used to detect the pressure of the coolant input to the cooling water pump; and / or A return water temperature sensor is installed between the output terminal of the battery pack and the input terminal of the cooling water pump to detect the temperature of the coolant input to the cooling water pump. and / or A water pressure sensor is installed between the output end of the PTC heater and the input end of the battery pack to detect the pressure of the coolant output from the PTC heater. and / or A coolant temperature sensor is installed between the output terminal of the PTC heater and the input terminal of the battery pack to detect the temperature of the coolant output from the PTC heater.

7. The heat recovery energy storage thermal management device based on an air-float centrifugal compressor according to claim 1, characterized in that, 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 on the user side, the output end on 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 device based on an air-float centrifugal compressor according to claim 1, characterized in that, The heat recovery circuit also includes: A heat recovery outlet water temperature sensor, installed between the second output terminal of the heat recovery plate heat exchanger and the input terminal of the heat recovery water pump, is used to detect the temperature of the liquid output from the heat recovery plate heat exchanger; and / or A heat recovery return water temperature sensor is installed between the output terminal on the user side and the second input terminal of the heat recovery plate heat exchanger to detect the temperature of the liquid input to the heat recovery plate heat exchanger.

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

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

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