Magnetic suspension centrifugal energy storage heat recovery water chiller unit and use method thereof

Abstract

The application discloses a magnetic suspension centrifugal energy storage heat recovery water chiller unit and a use method, and belongs to the technical field of refrigerators. The unit comprises a box body, an evaporator, a magnetic suspension centrifugal compressor and an energy storage tank. The magnetic suspension centrifugal compressor is fixedly connected with a pressure stabilizing assembly. The pressure stabilizing assembly can reduce the refrigerant pressure impact and high-frequency pulsation of the magnetic suspension centrifugal compressor. The pressure stabilizing assembly comprises a fixed box fixedly installed in the box body. The fixed box is fixedly connected with an air outlet pipe and an air inlet pipe. The pressure stabilizing assembly and the multi-stage multi-hole partition plate can realize expansion, throttling and rectification, effectively weaken the refrigerant pressure impact and high-frequency pulsation, reduce the rotor instantaneous unbalanced load, and significantly improve the suspension instability and alarm shutdown problems.

Description

Technical Field

[0001] This invention relates to the field of refrigeration technology, and in particular to a magnetically levitated centrifugal chiller unit with energy storage and heat recovery, and its usage method. Background Technology

[0002] When traditional magnetic levitation centrifugal chillers are operated with energy storage and heat recovery systems, the refrigerant pipelines are constantly subjected to complex operating conditions of alternating hot and cold temperatures and frequent switching between low and high loads. This can easily lead to problems such as refrigerant pressure surges, high-frequency airflow pulsations, and instantaneous load imbalances, causing the magnetic levitation compressor rotor to become unstable and frequently alarm and shut down. At the same time, the system is prone to generating non-condensable gases and liquid refrigerant during operation. Non-condensable gases can increase condensation pressure and reduce heat exchange efficiency, while liquid accumulation can easily cause liquid slugging, further exacerbating the instability of the unit's operation and affecting equipment safety and energy efficiency. Therefore, this paper provides a magnetic levitation centrifugal chiller with energy storage and heat recovery, as well as its usage method. Summary of the Invention

[0003] The purpose of this invention is to address the shortcomings of existing technologies by proposing a magnetically levitated centrifugal chiller unit with energy storage and heat recovery, and its usage method.

[0004] The present invention adopts the following technical solution: A magnetic levitation centrifugal chiller with energy storage and heat recovery includes a housing, an evaporator, a magnetic levitation centrifugal compressor, and an energy storage tank. The magnetic levitation centrifugal compressor is fixedly connected to a pressure stabilizing component, which can reduce refrigerant pressure surges and high-frequency pulsations in the magnetic levitation centrifugal compressor. The pressure stabilizing assembly includes a fixed box fixedly installed inside the housing. The fixed box is fixedly connected to an outlet pipe and an inlet pipe. The outlet pipe is connected to a magnetic levitation centrifugal compressor. Multiple partitions are slidably installed inside the fixed box. A fixed frame is fixedly connected inside the fixed box. A temperature regulating valve is fixedly installed inside the fixed frame. The temperature regulating valve and the inlet pipe are positioned opposite each other. Fixed rods are fixedly connected to the partitions. A control box is fixedly connected to the fixed box. The fixed rod closest to the outlet pipe is fixedly connected to the control box via a third connecting rod. A hydraulic cylinder is fixedly installed inside the control box. The hydraulic cylinder is electrically connected to the temperature regulating valve. A movable sleeve is fixedly installed at the output end of the hydraulic cylinder. An extension rod is rotatably sleeved on the movable sleeve. The extension rod is fixedly connected to the fixed rod closest to the inlet pipe. The fixed rod is connected via a diamond-shaped telescopic linkage mechanism.

[0005] Preferably, the fixed box is fixedly connected to an exhaust pipe, the exhaust pipe is located between the partition and the air outlet pipe, the exhaust pipe is fixedly connected to a pump body, the movable sleeve is fixedly connected to a movable frame, a fixed plate is fixedly connected inside the movable frame, a baffle is fixedly connected inside the control box, and the exhaust pipe is located between the baffle and the fixed plate.

[0006] Preferably, a plurality of sealing grooves are connected between the fixed box and the control box, the positions and number of the plurality of sealing grooves are opposite to the fixed rod, the fixed rod is fixedly sleeved with a sealing plate, and the sealing plate and the sealing groove are slidably connected.

[0007] Preferably, a drainage component is fixedly installed inside the fixed box. The drainage component can discharge the liquid accumulated in the fixed box in an intermittent manner. Under low load, the liquid can be discharged quickly, and under high load, the liquid can be discharged slowly or not discharged at all. This avoids the liquid surging and impact of high-speed airflow and high pressure, reduces the force disturbance on the rotor of the magnetic levitation centrifugal compressor, and ensures stable levitation operation.

[0008] Preferably, the discharge assembly includes a trough located on the lower side of the fixed box, a connecting pipe fixedly connected to the bottom of the trough, a cylinder fixedly connected to the lower side of the connecting pipe, a drain pipe fixedly connected to the lower side of the cylinder, a baffle slidably connected inside the cylinder, a first connecting rod fixedly connected to the upper side of the baffle, and a control assembly for controlling the movement of the first connecting rod fixedly installed inside the fixed box.

[0009] Preferably, the control assembly includes a control box fixedly installed inside a fixed box. A rotating shaft is rotatably installed inside the control box. Two gears are fixedly sleeved on the rotating shaft. A first connecting rod slides through the control box. A first rack is fixedly connected to the first connecting rod inside the control box. The first rack meshes with one of the gears. A moving rod slides through the control box. A second rack is fixedly connected to the moving rod. The second rack meshes with another gear. A spring is fixedly connected between the moving rod and the control box. A second connecting rod is slidably connected to the moving rod. A float is fixedly connected to the second connecting rod. An inclined block is fixedly connected to the side wall of the partition closest to the air intake pipe. The inclined block and the moving rod are positioned opposite each other.

[0010] Preferably, a rubber sleeve is fixedly fitted to the outside of the partition, and the rubber sleeve abuts against the inner wall of the fixed box.

[0011] A method for using a magnetically levitated centrifugal chiller unit with energy storage and heat recovery includes the following steps: S1. Before starting the unit, check the sealing status of all pipelines, valves, sensors and pressure stabilizing components, and confirm that the evaporator, energy storage tank, magnetic levitation centrifugal compressor and water system are normal and there are no leaks or blockages. S2. Start the magnetic levitation centrifugal compressor, and the unit enters the self-test and levitation establishment process; S3. The unit operates automatically according to the cooling load and heat recovery requirements: When the load is low, the temperature regulating valve opens wide, the hydraulic cylinder drives the diamond telescopic linkage mechanism to expand the diaphragm spacing and reduce throttling resistance, and at the same time the pressure stabilizing component automatically and intermittently discharges accumulated liquid and non-condensable gas; When the load is high, the temperature regulating valve closes narrow, the diaphragm spacing decreases, the damping pressure stabilization is enhanced, and the liquid discharge and gas discharge are kept at a very low level. S4. During operation, monitor the status of the magnetic levitation bearing, refrigerant pressure, water temperature and energy storage tank temperature in real time. If the unit malfunctions, it will automatically shut down. During normal shutdown, unload and reduce speed first, and then shut down the compressor and each water circuit system in sequence. For long-term shutdown, take precautions against freezing and ensure proper sealing.

[0012] The beneficial effects of this invention are: 1. Through the use of voltage stabilizing components and multi-stage porous baffles, capacity expansion, throttling, and rectification are achieved, effectively reducing refrigerant pressure shocks and high-frequency pulsations, reducing instantaneous unbalanced loads on the rotor, and significantly improving the problems of suspension instability and alarm shutdown. 2. By using a temperature regulating valve and a diamond-shaped telescopic linkage mechanism, the spacing between the partitions can be automatically adjusted according to the load: the spacing is increased and the flow resistance is reduced under low load; the spacing is reduced and the damping is enhanced under high load, which can adapt to alternating high and low load conditions. 3. The trough, in conjunction with the float, gear rack and baffle mechanism, enables the liquid to be discharged only when the liquid level is full and the load is low. It shuts off or discharges at a low flow rate when the load is high, thus avoiding liquid carryover and pressure shock from high-speed airflow and protecting the compressor rotor. 4. It adopts a rubber sleeve seal, and the fixing rod and the cavity are sealed by a sealing groove. The overall structure is compact and the operation is stable. It can be directly integrated into the magnetic levitation energy storage heat recovery chiller unit, which improves the reliability and energy efficiency of the whole machine. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of a magnetically levitated centrifugal chiller with energy storage and heat recovery proposed in this invention; Figure 2 This is a schematic diagram of the structure of a magnetically levitated centrifugal compressor in a magnetically levitated centrifugal chiller unit with energy storage and heat recovery proposed in this invention. Figure 3 This is a schematic diagram of the voltage stabilizing component in a magnetically levitated centrifugal chiller with energy storage and heat recovery proposed in this invention. Figure 4 This is a cross-sectional structural schematic diagram of the voltage stabilizing component in a magnetically levitated centrifugal chiller with energy storage and heat recovery proposed in this invention. Figure 5 This is a cross-sectional view of the connection of the voltage stabilizing component in a magnetically levitated centrifugal chiller with energy storage and heat recovery proposed in this invention; Figure 6 This is a schematic diagram of the control box in a magnetically levitated centrifugal chiller with energy storage and heat recovery proposed in this invention; Figure 7 This is a schematic diagram of the internal connection of the control box in a magnetic levitation centrifugal chiller with energy storage and heat recovery proposed in this invention; Figure 8 This is a cross-sectional view of the cylindrical structure in a magnetically levitated centrifugal chiller with energy storage and heat recovery proposed in this invention. Figure 9 This is a cross-sectional view of the control box in a magnetically levitated centrifugal chiller with energy storage and heat recovery proposed in this invention. Figure 10 This is a cross-sectional view of the control box in a magnetic levitation centrifugal chiller with energy storage and heat recovery proposed in this invention, taken from another angle.

[0014] In the diagram: 1. Housing, 2. Evaporator, 3. Flange interface, 4. Magnetic levitation centrifugal compressor, 5. Energy storage tank, 6. Pressure stabilizing component, 7. Fixed box, 8. Air outlet pipe, 9. Air inlet pipe, 10. Control box, 11. Pump body, 12. Partition plate, 13. Leakage groove, 14. Fixed frame, 15. Cylinder, 16. Drain pipe, 17. Exhaust pipe, 18. Fixed rod, 19. Extension rod, 20. Temperature regulating valve, 21. Inclined block, 22. Control box, 23. Baffle, 24. First connecting rod, 25. First rack, 26. Rotating shaft, 27. Gear, 28. Second rack, 29. Moving rod, 30. Spring, 31. Float, 32. Second connecting rod, 33. Connecting pipe, 34. Hydraulic cylinder, 35. Moving frame, 36. Fixed plate, 37. Sealing groove, 38. Moving sleeve, 39. Connecting plate, 40. Connecting shaft, 41. Third connecting rod. Detailed Implementation

[0015] See Figures 1-10 A magnetic levitation centrifugal chiller with energy storage and heat recovery includes a housing 1, an evaporator 2, a magnetic levitation centrifugal compressor 4, and an energy storage tank 5. The housing 1, the evaporator 2, and the magnetic levitation centrifugal compressor 4 are connected by a pipeline. A flange interface 3 is fixedly installed on the front side of the magnetic levitation centrifugal compressor 4. First, such as Figure 1 As shown, multiple heat dissipation fins are fixedly installed on the right side of the housing 1. A heat recovery heat exchange tube bundle is fixedly installed inside the housing 1, which can transfer the condensation heat of the refrigerant to the hot water circuit to achieve cooling and free hot water production. Secondly, there are two flange interfaces 3 for connecting to external units, one for water inlet and one for water outlet, forming a closed loop. Then, during operation, the refrigerant evaporates and absorbs heat in the evaporator 2 to produce chilled water. The magnetic levitation centrifugal compressor 4 draws in refrigerant vapor and compresses it into high-temperature and high-pressure gas. The high-temperature gas enters the housing 1, and part of the heat is transferred to the energy storage tank 5 through the heat recovery loop. The remaining heat is dissipated through the fins and cooling water. The condensed high-pressure liquid returns to the evaporator 2 to complete the cycle. At the same time, the chilled water is delivered out through the flange interface 3, thereby completing the cooling operation. The advantages of using a magnetic levitation centrifugal compressor 4 are as follows: It eliminates the traditional mechanical bearings and lubrication system, relying on electromagnetic attraction to completely suspend the motor rotor and high-speed impeller, resulting in zero contact and no mechanical friction between the rotor and the casing; high-speed variable frequency drive generates centrifugal force through high-speed impeller rotation, drawing in low-temperature, low-pressure refrigerant gas; through centrifugal compression, it performs work on the refrigerant vapor, significantly increasing its pressure and temperature, outputting high-temperature, high-pressure superheated refrigerant gas; it features intelligent vibration reduction and adaptive speed adjustment, allowing for stepless load adjustment from 10% to 100%, maintaining high efficiency even under low loads.

[0016] The pipeline is fixedly connected to a pressure stabilizing component 6, which can reduce refrigerant pressure shocks and high-frequency pulsations in the magnetic levitation centrifugal compressor 4, weaken instantaneous unbalanced loads, and improve rotor suspension instability, alarm shutdown, and other problems. The pressure stabilizing assembly 6 includes a fixed box 7 fixedly installed inside the housing 1. The fixed box 7 is fixedly connected to an outlet pipe 8 and an inlet pipe 9. The outlet pipe 8 is connected to the magnetic levitation centrifugal compressor 4. Multiple partitions 12 are slidably installed inside the fixed box 7. A fixed frame 14 is fixedly connected inside the fixed box 7. A temperature regulating valve 20 is fixedly installed inside the fixed frame 14. The temperature regulating valve 20 and the inlet pipe 9 are positioned opposite each other. A fixing rod 18 is fixedly connected to the upper side of the partition 12. A control box 10 is fixedly connected to the upper side of the fixed box 7. A third connecting rod 41 is fixedly connected to the upper side of the fixed rod 18 on the upper side of the partition 12 closest to the air outlet pipe 8. The third connecting rod 41 is fixedly connected to the control box 10. A hydraulic cylinder 34 is fixedly installed inside the control box 10. The hydraulic cylinder 34 is electrically connected to the temperature regulating valve 20. A movable sleeve 38 is fixedly installed at the output end of the hydraulic cylinder 34. An extension rod 19 is rotatably sleeved inside the movable sleeve 38. The extension rod 19 is fixedly connected to the fixed rod 18 closest to the air inlet pipe 9. The fixed rod 18 is connected by a diamond telescopic linkage mechanism. First, such as Figure 10 As shown, the rhomboid telescopic linkage mechanism includes two sets of connecting plates 39, each set consisting of multiple connecting plates 39. The multiple connecting plates 39 are rotatably connected end to end by a connecting shaft 40. The two sets of opposing connecting plates 39 are staggered and rotatably sleeved on the outside of the fixed rod 18. Secondly, when the gas enters the pressure stabilizing component 6 through the inlet pipe 9, the gas velocity will decrease instantly because the cross-sectional area of ​​the pressure stabilizing component 6 is much larger than that of the inlet pipe 9, and the pressure peak will naturally be "flattened". Then, under the action of the three perforated baffles 12, the pressure stabilizing component 6 is divided into four chambers, forming a stepped flow path of expansion-throttling-expansion-throttling. The high-frequency pressure pulsation will be repeatedly consumed and attenuated when passing through these small holes, becoming a stable pressure flow. Furthermore, the porous baffles 12 can disperse the turbulent airflow, rectify the impact flow and eddy current into a more uniform flow field, and reduce the impact on the downstream equipment. Then, the temperature regulating valve 20 is a device that automatically adjusts its opening according to temperature changes. The output end of the temperature regulating valve 20 is connected to the hydraulic cylinder 34 through a connecting pipe, forming a linkage control structure of temperature signal-hydraulic pressure-mechanical displacement. Under low load, i.e., low temperature conditions, the opening of the temperature regulating valve 20 increases, the control pressure of the hydraulic cylinder 34 decreases, and thus drives the moving sleeve 38 to move. Figure 10 From the perspective of the control box 10, the moving sleeve 38 will move to the right. Since the third connecting rod 41 on the upper side of the leftmost fixed rod 18 is fixedly connected to the control box 10, when the moving sleeve 38 moves to the right, under the action of the diamond telescopic linkage mechanism, all partitions 12 except the leftmost partition 12 will move to the right, and the distance between two adjacent partitions 12 will gradually increase. At this time, the throttling intensity can be reduced and the additional resistance can be reduced. Under high load, the opening of the temperature regulating valve 20 decreases and the control pressure in the hydraulic cylinder 34 increases. The hydraulic cylinder 34 will drive the moving sleeve 38 to move to the left. At this time, under the action of the diamond telescopic linkage mechanism, all partitions 12 except the leftmost partition 12 will move to the left, and the distance between two adjacent partitions 12 will gradually shorten, increasing the damping effect and strengthening the peak shaving and pressure stabilization capabilities.

[0017] An exhaust pipe 17 is fixedly connected to the upper side of the fixed box 7. The exhaust pipe 17 is located between the partition 12 and the air outlet pipe 8. A pump body 11 is fixedly connected to the upper side of the exhaust pipe 17. A movable frame 35 is fixedly connected to the outer side of the movable sleeve 38. A fixed plate 36 is fixedly connected inside the movable frame 35. A baffle is fixedly connected inside the control box 10. The exhaust pipe 17 is located between the baffle and the fixed plate 36. First, during the operation of the device, non-condensable gases will gradually be generated. Non-condensable gases refer to various mixed gases that do not liquefy and remain in a gaseous state within the normal operating temperature and pressure range of the system. The main reasons for their generation are incomplete vacuuming during equipment manufacturing, installation, and maintenance, residual air, dissolved air introduced by water replenishment and softening water, and precipitation at high temperatures. As time goes by, the content of non-condensable gases gradually increases, which will lead to a larger compression ratio of the magnetic levitation centrifugal compressor 4, a surge in power consumption, and the magnetic levitation centrifugal compressor 4 being prone to high-pressure alarms and surges. It will also greatly occupy the heat exchange space and affect the heat exchange efficiency. When the gas enters the fixed box 7 through the inlet pipe 9, the non-condensable gas will accumulate on the upper side of the fixed box 7. When the pump body 11 is started, the pump body 11 will draw out the non-condensable gas through the exhaust pipe 17. Then the non-condensable gas can be treated accordingly. During the treatment process, at low load, the refrigerant flow rate is small and the flow rate is slow, and the non-condensable gas is more likely to accumulate on the top of the pressure stabilizing component 6, occupying the effective heat exchange and circulation space, causing abnormal pressure and heat exchange attenuation. At high load, when the moving frame 35 moves to the left, it will squeeze the exhaust pipe 17, thereby reducing the discharge efficiency of the non-condensable gas, and finally achieving the effect of automatically controlling the discharge amount of non-condensable gas. It should be noted that the exhaust pipe 17 is a thin-walled stainless steel flexible corrugated pipe, which is a flexible hose that can automatically recover, be squeezed, and rebound. Therefore, when the exhaust pipe 17 clamps the baffle and the fixing plate 36, it will cause the cross-section of the exhaust pipe 17 to become flat or smaller, thereby reducing the exhaust volume. After the moving frame 35 is reset, the exhaust pipe 17 can rely on its own elasticity to restore its original shape, so that the exhaust flow area can be automatically adjusted according to the load.

[0018] Multiple sealing grooves 37 are connected between the fixed box 7 and the control box 10. The position and number of the multiple sealing grooves 37 are opposite to the fixed rod 18. A sealing plate is fixedly sleeved on the outside of the fixed rod 18. The sealing plate and the sealing groove 37 are slidably connected. A drainage component is fixedly installed inside the fixed box 7. The drainage component can discharge the liquid accumulated in the fixed box 7 in an intermittent manner. It can discharge the liquid quickly under low load and discharge it slowly or not at all under high load. This avoids the liquid surging and high pressure impact of high-speed airflow, reduces the force disturbance on the rotor of the magnetic levitation centrifugal compressor 4, and ensures stable levitation operation. The discharge assembly includes a trough 13 located on the lower side of the fixed box 7. A connecting pipe 33 is fixedly connected to the bottom of the trough 13. A cylinder 15 is fixedly connected to the lower side of the connecting pipe 33. A drain pipe 16 is fixedly connected to the lower side of the cylinder 15. A baffle 23 is slidably connected inside the cylinder 15. A first connecting rod 24 is fixedly connected to the upper side of the baffle 23. A control assembly for controlling the movement of the first connecting rod 24 is fixedly installed inside the fixed box 7. The control assembly includes a control box 22 fixedly installed inside the fixed box 7. A rotating shaft 26 is rotatably installed inside the control box 22. Two gears 27 are fixedly sleeved on the outer side of the rotating shaft 26. The first connecting rod 24 slides through the control box 22. The first connecting rod 24 is fixedly connected to the first rack 25 inside the control box 22. The first rack 25 meshes with one of the gears 27. The side wall of the control box 22 is slidably connected to the moving rod 29. The lower side of the moving rod 29 is fixedly connected to the second rack 28. The second rack 28 meshes with another gear 27. The moving rod 29 and the control box 22 are fixedly connected to the spring 30. The upper side of the moving rod 29 is slidably connected to the second connecting rod 32. The lower side of the second connecting rod 32 is fixedly connected to the float 31. The side wall of the partition 12 closest to the air intake pipe 9 is fixedly connected to the inclined block 21. The inclined block 21 and the moving rod 29 are in opposite positions. During the operation of the device, liquid is generated in the pressure stabilizing component 6. This liquid consists of a small amount of liquid refrigerant, pipeline impurities, scale, trace amounts of refrigeration oil, etc. As time goes by, the liquid in the trough 13 gradually increases. Secondly, the float 31 refers to a solid, lightweight float that can float on the surface of liquid refrigerant or hot water, has a lower density than the liquid medium, is corrosion-resistant, resistant to high and low temperatures, and is insoluble in refrigerant and water. In this design, polypropylene (PP) material is used. This float 31 has a low density and can float perfectly on the liquid. When the liquid in the trough 13 gradually increases, it causes the float 31 to move upwards, which in turn drives the second connecting rod 32 to move upwards. Because the fixed box 7 is in a state of alternating hot and cold conditions, i.e., alternating low and high load conditions, the partition 12 will move back and forth. During this process, if... Figure 10As shown, the inclined block 21 is trapezoidal. When the second connecting rod 32 moves to the vertical surface of the inclined block 21, the back-and-forth moving partition 12 abuts against the second connecting rod 32, causing the second connecting rod 32 to move to the right. The second connecting rod 32 then moves the moving rod 29 to the right. While the second connecting rod 32 compresses the spring 30, it also moves the second rack 28 to the right. The second rack 28 then drives the meshing gear 27 to rotate clockwise. The rotating gear 27 drives another gear 27 to rotate clockwise via the rotating shaft 26, which in turn causes this gear 27 to drive the meshing first rack 25 downwards. The first rack 25 moves downward, causing the first connecting rod 24 to move downward. The first connecting rod 24 then moves the baffle 23 downward, causing the connection between the baffle 23 and the cylinder 15 to break. The liquid in the trough 13 will enter the cylinder 15 along the connecting pipe 33, and then be discharged through the cylinder 15 and the drain pipe 16. The discharged liquid can then be processed. During this process, the liquid in the trough 13 will only be discharged when the load is low and the liquid in the trough 13 is large. This avoids the high-speed airflow surging with liquid and the impact of high pressure, reduces the force disturbance on the rotor of the magnetic levitation compressor, and ensures stable levitation operation.

[0019] A rubber sleeve is fixedly fitted to the outside of the partition 12. The rubber sleeve abuts against the inner wall of the fixed box 7, which improves the overall sealing of the device.

[0020] A method for using a magnetically levitated centrifugal chiller unit with energy storage and heat recovery includes the following steps: S1. Before starting the unit, check the sealing status of each pipeline, valve, sensor and pressure stabilizing component 6, and confirm that the evaporator 2, energy storage tank 5, magnetic levitation centrifugal compressor 4 and water system are normal and there are no leaks or blockages. S2. Start the magnetic levitation centrifugal compressor, and the unit enters the self-test and levitation establishment process; S3. The unit operates automatically according to the cooling load and heat recovery requirements: When the load is low, the temperature regulating valve 20 is opened wide, and the hydraulic cylinder 34 drives the diamond telescopic linkage mechanism to expand the gap of the partition 12 and reduce the throttling resistance. At the same time, the pressure stabilizing component 6 automatically and intermittently discharges accumulated liquid and non-condensable gas; When the load is high, the temperature regulating valve 20 is closed, the gap of the partition 12 is reduced, the damping and pressure stabilization are enhanced, and the liquid discharge and gas discharge are kept at a low level. S4. During operation, monitor the status of the magnetic levitation bearing, refrigerant pressure, water temperature and energy storage tank 5 temperature in real time. If the unit malfunctions, it will automatically shut down. During normal shutdown, unload and reduce speed first, and then shut down the compressor and each water circuit system in sequence. For long-term shutdown, take precautions against freezing and ensure proper sealing.

[0021] In this invention, when gas enters the pressure stabilizing component 6 through the inlet pipe 9, the gas flow rate will decrease instantly because the cross-sectional area of ​​the cavity of the pressure stabilizing component 6 is much larger than that of the inlet pipe 9. The pressure peak will naturally be "flattened". Then, under the action of the three perforated baffles 12, the pressure stabilizing component 6 is divided into four chambers, forming a stepped flow path of expansion-throttling-expansion-throttling. The high-frequency pressure pulsation will be repeatedly consumed and attenuated when passing through these small holes, becoming a stable pressure flow. In addition, the porous baffles 12 can disperse the turbulent airflow and rectify the impact flow and eddy current into a more uniform flow field, reducing the impact on the downstream equipment. At low load, i.e., low temperature, the opening of the temperature regulating valve 20 increases, the control pressure of the hydraulic cylinder 34 decreases, and the moving sleeve 38 is driven to move. This causes the moving sleeve 38 to move to the right. Since the third connecting rod 41 on the upper side of the leftmost fixed rod 18 is fixedly connected to the control box 10, when the moving sleeve 38 moves to the right, under the action of the diamond telescopic linkage mechanism, all partitions 12 except the leftmost partition 12 will move to the right, and the distance between two adjacent partitions 12 will gradually increase. This can reduce the throttling intensity and reduce additional resistance. At high load, the opening of the temperature regulating valve 20 decreases, the control pressure in the hydraulic cylinder 34 increases, and the hydraulic cylinder 34 will drive the moving sleeve 38 to move to the left. At this time, under the action of the diamond telescopic linkage mechanism, all partitions 12 except the leftmost partition 12 will move to the left, and the distance between two adjacent partitions 12 will gradually shorten, increasing the damping effect and strengthening the peak shaving and pressure stabilization capabilities. When the gas enters the fixed box 7 through the inlet pipe 9, the non-condensable gas will accumulate on the upper side of the fixed box 7. When the pump body 11 is started, the pump body 11 will draw out the non-condensable gas through the exhaust pipe 17. Then the non-condensable gas can be treated accordingly. During the treatment process, at low load, the refrigerant flow rate is small and the flow rate is slow, and the non-condensable gas is more likely to accumulate on the top of the pressure stabilizing component 6, occupying the effective heat exchange and circulation space, causing abnormal pressure and heat exchange attenuation. At high load, when the moving frame 35 moves to the left, it will squeeze the exhaust pipe 17, thereby reducing the discharge efficiency of the non-condensable gas, and finally achieving the effect of automatically controlling the discharge amount of non-condensable gas. During the operation of the device, as the liquid in the trough 13 gradually increases, the float 31 moves upward, causing the second connecting rod 32 to move upward. Because the fixed box 7 is constantly under alternating hot and cold conditions (low and high loads), the partition 12 moves back and forth. During this process, when the second connecting rod 32 moves to the vertical surface of the inclined block 21, the back-and-forth moving partition 12 and the second connecting rod 32 collide, causing the second connecting rod 32 to move to the right. The second connecting rod 32 then moves the moving rod 29 to the right. Simultaneously, the second connecting rod 32 compresses the spring 30, causing the second rack 28 to move to the right. The second rack 28 then engages the meshing teeth... Wheel 27 rotates clockwise, and the rotating gear 27 drives another gear 27 to rotate clockwise through shaft 26, which in turn causes the first rack 25 to move downward. The first rack 25 drives the first connecting rod 24 and the baffle 23 to move downward, which in turn causes the connection between the baffle 23 and the cylinder 15 to be disconnected. The liquid in the trough 13 will enter the cylinder 15 along the connecting pipe 33, and then be discharged through the cylinder 15 and the drain pipe 16. The discharged liquid can then be processed. In this process, the liquid in the trough 13 will only be discharged when the load is low and the liquid in the trough 13 is large, so as to avoid the high-speed airflow surging with liquid and the impact of high pressure, reduce the force disturbance of the magnetic levitation compressor rotor, and ensure stable levitation operation.

Claims

1. A magnetically levitated centrifugal chiller with energy storage and heat recovery, comprising a housing (1), an evaporator (2), a magnetically levitated centrifugal compressor (4), and an energy storage tank (5), characterized in that, The magnetically levitated centrifugal compressor (4) is fixedly connected to a pressure stabilizing component (6), which can reduce refrigerant pressure surges and high-frequency pulsations. The voltage stabilizing component (6) includes a fixed box (7) fixedly installed inside the housing (1). The fixed box (7) is fixedly connected to an outlet pipe (8) and an inlet pipe (9). The outlet pipe (8) is connected to a magnetic levitation centrifugal compressor (4). The fixed box (7) is slidably installed with multiple partitions (12). A fixed frame (14) is fixedly connected inside the fixed box (7). A temperature regulating valve (20) is fixedly installed inside the fixed frame (14). The temperature regulating valve (20) and the inlet pipe (9) are positioned opposite each other. A fixed rod (1) is fixedly connected to the partition (12). 8) The fixed box (7) is fixedly connected to the control box (10), and the fixed rod (18) closest to the air outlet pipe (8) is fixedly connected to the control box (10) through the third connecting rod (41). The control box (10) is fixedly installed with a hydraulic cylinder (34). The output end of the hydraulic cylinder (34) is fixedly installed with a movable sleeve (38). The movable sleeve (38) is rotatably sleeved with an extension rod (19). The extension rod (19) is fixedly connected to the fixed rod (18) closest to the air inlet pipe (9). The fixed rod (18) is connected through a diamond telescopic linkage mechanism.

2. The magnetic levitation centrifugal chiller unit with energy storage and heat recovery according to claim 1, characterized in that, The fixed box (7) is fixedly connected to an exhaust pipe (17), which is located between the partition (12) and the air outlet pipe (8). The exhaust pipe (17) is fixedly connected to a pump body (11). The movable sleeve (38) is fixedly connected to a movable frame (35). A fixed plate (36) is fixedly connected inside the movable frame (35). A baffle is fixedly connected inside the control box (10). The exhaust pipe (17) is located between the baffle and the fixed plate (36).

3. The magnetic levitation centrifugal chiller unit with energy storage and heat recovery according to claim 2, characterized in that, Multiple sealing grooves (37) are connected between the fixed box (7) and the control box (10). The position and number of the multiple sealing grooves (37) are opposite to the fixed rod (18). The fixed rod (18) is fixedly sleeved with a sealing plate. The sealing plate and the sealing grooves (37) are slidably connected.

4. The magnetic levitation centrifugal chiller unit with energy storage and heat recovery according to claim 3, characterized in that, The fixed box (7) is equipped with a drainage component. The drainage component can discharge the liquid in the fixed box (7) in an intermittent manner. It can discharge the liquid quickly under low load and discharge it slowly or not at all under high load. This avoids the liquid surging and impact of high-speed airflow and high pressure, reduces the force disturbance on the rotor of the magnetic levitation centrifugal compressor (4), and ensures stable suspension operation.

5. A magnetically levitated centrifugal chiller unit with energy storage and heat recovery according to claim 4, characterized in that, The discharge assembly includes a trough (13) on the lower side of the fixed box (7), a connecting pipe (33) is fixedly connected to the bottom of the trough (13), a cylinder (15) is fixedly connected to the lower side of the connecting pipe (33), a drain pipe (16) is fixedly connected to the lower side of the cylinder (15), a baffle (23) is slidably connected inside the cylinder (15), a first connecting rod (24) is fixedly connected to the upper side of the baffle (23), and a control assembly for controlling the movement of the first connecting rod (24) is fixedly installed inside the fixed box (7).

6. A magnetically levitated centrifugal chiller with energy storage and heat recovery according to claim 5, characterized in that, The control assembly includes a control box (22) fixedly installed inside a fixed box (7). A rotating shaft (26) is rotatably installed inside the control box (22). Two gears (27) are fixedly sleeved on the rotating shaft (26). A first connecting rod (24) slides through the control box (22). A first rack (25) is fixedly connected to the first connecting rod (24) inside the control box (22). The first rack (25) meshes with one of the gears (27). A moving rod (29) slides through the control box (22). The moving rod (29) is fixedly connected to a second rack (28), which meshes with another gear (27). A spring (30) is fixedly connected between the moving rod (29) and the control box (22). The moving rod (29) is slidably connected to a second connecting rod (32), which is fixedly connected to a float (31). A wedge (21) is fixedly connected to the side wall of the partition (12) closest to the air intake pipe (9), and the wedge (21) and the moving rod (29) are positioned opposite each other.

7. A magnetically levitated centrifugal chiller unit with energy storage and heat recovery according to claim 6, characterized in that, The partition (12) is fixedly fitted with a rubber sleeve, and the rubber sleeve abuts against the inner wall of the fixed box (7).

8. A method of using the magnetic levitation centrifugal chiller unit with energy storage and heat recovery according to claim 7, characterized in that, Includes the following steps: S1. Before starting the machine, check the sealing status of each pipeline, valve, sensor and pressure stabilizing component (6) of the unit, and confirm that the evaporator (2), energy storage tank (5), magnetic levitation centrifugal compressor (4) and water system are normal and without leakage or blockage. S2. Start the magnetic levitation centrifugal compressor, and the unit enters the self-test and levitation establishment process; S3. The unit operates automatically according to the cooling load and heat recovery requirements: When the load is low, the temperature regulating valve (20) is opened wide, and the hydraulic cylinder (34) drives the diamond telescopic linkage mechanism to expand the spacing of the baffles (12) and reduce the throttling resistance. At the same time, the pressure stabilizing component (6) automatically and intermittently discharges the accumulated liquid and non-condensable gas. When the load is high, the temperature regulating valve (20) is closed, the spacing of the baffles (12) is reduced, the damping and pressure stabilization are enhanced, and the liquid discharge and gas discharge are kept in a small amount. S4. During operation, monitor the status of the magnetic levitation bearing, refrigerant pressure, water temperature and energy storage tank (5) temperature in real time. If the unit is abnormal, it will automatically shut down. When shutting down normally, first unload and reduce speed, then shut down the compressor and each water system in sequence. For long-term shutdown, do a good job of antifreeze and sealing protection.

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