Energy-saving magnetic suspension centrifugal water chilling unit

Abstract

The invention discloses an energy-saving type magnetic suspension centrifugal water chilling unit, and relates to the technical field of refrigeration, the energy-saving type magnetic suspension centrifugal water chilling unit comprises a magnetic suspension compressor, a variable-diameter throttling mechanism and a heat exchange system, the heat exchange system is fixedly installed on the side face of the outer wall of the magnetic suspension compressor, and the variable-diameter throttling mechanism is fixedly installed on the side face of the outer wall of the heat exchange system; an outlet of the magnetic suspension compressor is directly connected with the heat exchange system through a pipeline, and the reducing throttling mechanism is connected with the heat exchange system through a pipeline. The front-stage closed impeller and the rear-stage semi-open impeller are coaxially connected in series, efficient compression without mechanical contact and oil lubrication is achieved, the problems that a centrifugal compressor is high in energy consumption and large in vibration due to mechanical friction are solved, and the energy efficiency ratio of a unit is effectively increased.

Description

Technical Field

[0001] The present invention relates to the technical field of refrigeration, and specifically to an energy-saving magnetic levitation centrifugal chiller. Background Art

[0002] The core principle of a chiller is the reverse Carnot cycle, which realizes heat transfer through four stages: compression → condensation → expansion → evaporation. The refrigeration system contributes approximately 15% of carbon emissions, and the HFCs refrigerant used has an extremely high global warming potential. Magnetic levitation technology, with characteristics such as frictionless operation and high-efficiency energy conversion, has become an important direction for technological upgrading in the refrigeration industry.

[0003] In existing magnetic levitation units, the energy efficiency fluctuates significantly under extreme operating conditions, and the excessive energy consumption of the distribution system will offset the energy-saving effect of the main unit.

[0004] Patent CN114508808B discloses a magnetic levitation variable-frequency chiller. The above patent realizes the energy saving of the chiller, ensures the reliability of the chiller, improves the energy-saving effect, reliability and stability, and also realizes the balanced control of the operating efficiency and energy efficiency of the chiller.

[0005] In the above patent, by real-time monitoring of the compressor operating parameters (frequency, pressure ratio, suction guide vane opening), and dynamically adjusting the start / stop or frequency reduction operation of the compressor when the preset conditions are met, the balance between energy efficiency optimization and operating reliability is achieved. However, the existing technology mainly focuses on the control optimization at the compressor level, and there is still room for improvement in the overall energy efficiency coordination of the chiller system.

[0006] Therefore, the present application proposes an energy-saving magnetic levitation centrifugal chiller that can achieve stepless adjustment of the refrigerant flow rate, combines the cold storage / release function of the phase change material in the cold storage tank, and effectively reduces the throttling loss under low-load conditions. Summary of the Invention

[0007] The purpose of the present invention is to provide an energy-saving magnetic levitation centrifugal chiller to solve the technical problems in the above background art that the energy efficiency of existing magnetic levitation units fluctuates significantly under extreme operating conditions, and the excessive energy consumption of the distribution system will offset the energy-saving effect of the main unit.

[0008] To achieve the above purpose, the present invention provides the following technical solution: An energy-saving magnetic levitation centrifugal chiller, comprising a magnetic levitation compressor, a variable-diameter throttling mechanism, and a heat exchange system. The heat exchange system is fixedly installed on the outer wall side of the magnetic levitation compressor, the variable-diameter throttling mechanism is fixedly installed on the outer wall side of the heat exchange system, the outlet of the magnetic levitation compressor is directly connected to the heat exchange system through a pipeline, and the variable-diameter throttling mechanism is connected to the heat exchange system through a pipeline; The magnetic levitation compressor includes an electromagnetic bearing assembly, a front-stage closed impeller, and a rear-stage semi-open impeller. The electromagnetic bearing assembly, the front-stage closed impeller, and the rear-stage semi-open impeller are coaxially linearly arranged along the same rotating shaft. The electromagnetic bearing assembly is centrally disposed in the middle of the rotating shaft. The hub of the front-stage closed impeller is fixedly connected to the end of the rotating shaft by a key connection. The rear-stage semi-open impeller is fixedly installed at the rear end of the outer wall of the electromagnetic bearing assembly. The shaft body of the rear-stage semi-open impeller and the electromagnetic bearing assembly form a rigid connection through interference fit.

[0009] Preferably, the variable-diameter throttling mechanism is connected in series to the main circulation pipeline from the outlet of the condenser to the inlet of the evaporator; The variable-diameter throttling mechanism includes a variable-diameter valve body, an actuator, and a heat dissipation pipe. The actuator is fixedly installed at the top end of the outer wall of the variable-diameter valve body. The heat dissipation pipe is sleeved on the outer wall of the variable-diameter valve body. The surface of the heat dissipation pipe is provided with spiral fins. The variable-diameter valve body includes a valve core and a variable-diameter pipe. The valve core and the variable-diameter pipe are connected by a threaded locking structure. The output shaft of the actuator is connected to the rear end shaft of the valve core through a cross-slider coupling. The data line of the pressure sensor is passed through the wire groove provided inside the heat dissipation pipe and extends to the junction box on the side of the variable-diameter valve body. A thermal conductive silicone grease layer is filled between the heat dissipation pipe and the variable-diameter pipe.

[0010] Preferably, the heat exchange system includes an evaporator, a condenser, and a refrigerant circulation pipeline. The evaporator is fixedly installed on the support frame on the side of the outer wall of the base of the chiller. A column is fixedly installed at the bottom end of the outer wall of the condenser, and the column is vertically installed at the top end of the outer wall of the evaporator. The evaporator is connected to the chilled water pipeline through a flange interface, and the condenser is connected to the cooling tower water pipeline through a threaded joint; The refrigerant circulation pipeline is arranged in a U-shaped trend along the rear end of the inner wall of the chiller. The refrigerant circulation pipeline includes a magnetic levitation compressor outlet pipe section, a condenser inlet pipe section, an evaporator inlet pipe section, and a magnetic levitation compressor return air pipe section. The refrigerant circulation pipeline uses copper hard pipes to connect the magnetic levitation compressor outlet, the condenser shell side inlet, and the condenser tube side outlet in sequence. The condenser tube side outlet is connected to the evaporator tube side inlet through an electronic expansion valve. The evaporator shell side outlet returns to the magnetic levitation compressor inlet through a fluorine pump bypass branch.

[0011] Preferably, a fluorine pump energy-saving mechanism is fixedly installed on the bypass branch connecting the evaporator outlet and the magnetic levitation compressor return air pipe section. The fluorine pump energy-saving mechanism is connected in parallel with the main pipeline through a three-way valve. The fluorine pump energy-saving mechanism includes a fluorine pump, a cold storage tank, and a three-way valve. The L-shaped bracket is welded on the outer wall of the cold storage tank and fixedly installed on the base of the chiller. The two outlets at the bottom of the three-way valve are respectively connected to the inlet of the variable-diameter throttling mechanism and the fluorine pump pipeline through threaded interfaces. The inlet of the fluorine pump is connected to the fluorine pump side outlet of the three-way valve through a corrugated compensator. The outlet of the fluorine pump is connected to the evaporator inlet pipeline through a check valve; The valve core consists of a hemispherical valve flap connected to the lower end of the valve stem. The top of the valve stem is connected to a stepper motor, which drives the rotation of the valve stem through a toothed belt. There are two annular sealing grooves in the inner cavity of the valve body, which are respectively connected to the variable-diameter throttling mechanism and the fluorine pump pipeline.

[0012] Preferably, the electromagnetic bearing assembly includes a radial bearing and an axial bearing. There are 8 groups of electromagnetic coils evenly distributed inside the radial bearing at equal intervals. The axial bearing is arranged at the end of the rotor. An annular bearing seat is fixedly installed on the inner wall of the magnetic levitation compressor housing. 8 groups of sector-shaped neodymium iron boron permanent magnets are circumferentially embedded in the inner wall of the annular bearing seat. The magnetic poles of adjacent permanent magnets are arranged alternately as N-S. The electromagnetic coils are circumferentially distributed on the outer surface of the rotor through winding skeletons. Each winding skeleton is arranged radially opposite to the permanent magnet. The outer wall of the winding skeleton is wound with enameled copper wire to form an electromagnetic coil. The coil leads pass through the through hole at the center of the rotor and are connected to an external power supply. Hall sensors are fixedly installed on both sides of the annular bearing seat. A conical thrust plate is fixedly installed at the end of the rotor. Axial electromagnets are symmetrically arranged on both sides of the conical thrust plate. The electromagnet iron cores are fixed inside the housing end cover by bolts. A working air gap of 1.2 - 1.5 mm is formed between the end face of the iron core and the conical thrust plate.

[0013] Preferably, the inner cavity of the cold storage tank is divided into upper and lower areas. The upper layer is a spiral copper tube heat exchange layer. Both ends of the spiral copper tube heat exchange layer are respectively connected to the fluorine pump outlet pipeline and the evaporator inlet through quick-installation clamps. The lower layer is filled with phase change materials, and the phase change materials are encapsulated in a three-dimensional grid composed of honeycomb aluminum plates.

[0014] Preferably, a stirring barrel is arranged on the side of the outer wall of the magnetic levitation compressor. A medicine adding port with a threaded cover is fixedly installed at the top of the outer wall of the stirring barrel. The bottom of the outer wall of the stirring barrel is connected to a medicine delivery pump through a quick-installation joint. A central cylinder is coaxially arranged inside the stirring barrel; There are two rows of staggered rectangular openings on the outer wall of the central cylinder. Stainless steel baffles with spring reset are hinged inside the openings. A cutter head is fixedly installed at the bottom end of the inner wall of the stirring barrel. The spindle is installed through the bottom of the cutter head. An annular crushing plate is fixedly installed 10 mm above the cutter head. The annular crushing plate is fixed on the inner wall of the stirring barrel through four support rods. Conical teeth are arranged at equal angles at the bottom end of the outer wall of the annular crushing plate.

[0015] Preferably, a waterproof electrical box is arranged inside the base of the water chiller. A frequency conversion unit is arranged at the top end of the inner wall of the waterproof electrical box. A double-way power supply contactor is arranged at the bottom end of the outer wall of the frequency conversion unit. The output end of the frequency conversion unit is connected to the winding of the magnetic levitation compressor through a shielded cable. A mechanical interlock is arranged in the double-way power supply line.

[0016] Preferably, a two-way pressure stabilizing pipeline structure is arranged between the magnetic levitation compressor and the evaporator. The two-way pressure stabilizing pipeline structure includes a Y-shaped diverter and a three-dimensional shock-absorbing bellows. The Y-shaped diverter is arranged at the outlet end of the magnetic levitation compressor, and the three-dimensional shock-absorbing bellows is arranged on the return air pipe section. The two outlet branch pipes of the Y-shaped diverter are respectively connected to the inlet of the condenser shell side and the bypass interface of the fluorine pump energy-saving mechanism. There is a transition pipe section with guide ribs between the flange end face of the three-dimensional shock-absorbing bellows and the suction port of the magnetic levitation compressor, and an annular rectifying grid is arranged on the inner wall of the transition pipe section.

[0017] Preferably, an adaptive diversion mechanism is integrated at the outlet of the condenser tube side of the refrigerant circulation pipeline. The adaptive diversion mechanism includes a rotatable diversion cone and an annular adjustment ring. The diversion cone is linked with the actuator through a connecting rod. The inner wall of the annular adjustment ring is provided with radially telescopic diversion blades. The telescopic stroke of the diversion blades forms a mechanical interlock with the valve core opening of the variable diameter throttling mechanism. A spiral guide groove is arranged on the outer surface of the diversion cone, and the spiral guide groove guides the refrigerant flow to the inlet of the evaporator.

[0018] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. In the present invention, the front-stage closed impeller and the rear-stage semi-open impeller are coaxially connected in series, realizing efficient compression without mechanical contact and oil lubrication, solving the problems of high energy consumption and large vibration caused by mechanical friction in centrifugal compressors, and effectively improving the energy efficiency ratio of the unit; 2. In the present invention, through the mechanical interlock between the variable diameter valve body and the fluorine pump energy-saving mechanism, dynamic flow regulation and cooling capacity release during load fluctuations are realized, solving the problem of energy efficiency loss caused by the lag of the throttling device regulation, and avoiding the life loss caused by frequent start and stop of the compressor; 3. In the present invention, through the diversion cone, the real-time optimal distribution of the refrigerant flow direction at the outlet of the condenser is realized, solving the problem of uneven refrigerant distribution caused by the fixed diversion structure, and improving the heat exchange efficiency of the evaporator; 4. In the present invention, through the conical thrust disc, the control of the air gap is realized, solving the problem of refrigerant reflux oscillation under high pressure difference conditions, and optimizing the mechanical vibration transmission path. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is the front view structural schematic diagram of the present invention; Figure 2 is the structural schematic diagram of the variable diameter throttling mechanism of the present invention; Figure 3 is the internal structural schematic diagram of the magnetic levitation compressor of the present invention; Figure 4 is the structural schematic diagram of the stirring barrel of the present invention; Figure 5 is the structural schematic diagram of the electromagnetic bearing assembly of the present invention; Figure 6Schematic structural diagram of the adaptive flow guiding mechanism of the present invention; Figure 7 Schematic structural diagram of the heat dissipation system of the present invention; Figure 8 Schematic structural diagram of the fluorine pump energy-saving mechanism of the present invention.

[0020] In the figure: 1. Magnetic levitation compressor; 2. Variable-diameter throttling mechanism; 3. Electromagnetic bearing assembly; 4. Front-stage closed impeller; 5. Rear-stage semi-open impeller; 6. Evaporator; 7. Condenser; 8. Refrigerant circulation pipeline; 9. Chiller base; 10. Support frame; 11. Column; 12. Variable-diameter valve body; 13. Fluorine pump energy-saving mechanism; 14. Actuator; 15. Heat dissipation pipe; 16. Cross-slider coupling; 17. Fluorine pump; 18. Cold storage tank; 19. Three-way valve; 20. Radial bearing; 21. Axial bearing; 22. Rotor; 23. Tapered thrust plate; 24. Stirring barrel; 25. Chemical addition port; 26. Central cylinder; 27. Cutter head; 28. Annular crushing plate; 29. Waterproof electrical box; 30. Y-shaped diverter; 31. Three-dimensional shock-absorbing bellows; 32. Adaptive flow guiding mechanism; 33. Flow guiding cone; 34. Annular adjusting ring; 35. Spiral guide groove. Detailed implementation manners

[0021] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0022] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "upper", "lower", "inner", "outer", "front end", "rear end", "both ends", "one end", "the other end", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0023] In the description of the present invention, it should be noted that, unless otherwise clearly specified and defined, terms such as "installation", "equipped with", "connection", etc. should be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0024] Please refer to Figure 1 、 Figure 2 , Figure 3 and Figure 5 ,an embodiment provided by the present invention: an energy-saving magnetic levitation centrifugal chiller, including a magnetic levitation compressor 1, a variable diameter throttling mechanism 2 and a heat exchange system. The heat exchange system is fixedly installed on the outer wall side of the magnetic levitation compressor 1, and the variable diameter throttling mechanism 2 is fixedly installed on the outer wall side of the heat exchange system. The outlet of the magnetic levitation compressor 1 is directly connected to the heat exchange system through a pipeline, and the variable diameter throttling mechanism 2 is connected to the heat exchange system through a pipeline; the magnetic levitation compressor 1 includes an electromagnetic bearing assembly 3, a front-stage closed impeller 4 and a rear-stage semi-open impeller 5. The electromagnetic bearing assembly 3, the front-stage closed impeller 4 and the rear-stage semi-open impeller 5 are coaxially linearly arranged along the same rotating shaft. The electromagnetic bearing assembly 3 is centrally arranged in the middle of the rotating shaft. The hub of the front-stage closed impeller 4 is fixedly connected to the end of the rotating shaft through a key connection. The rear-stage semi-open impeller 5 is fixedly installed at the rear end of the outer wall of the electromagnetic bearing assembly 3. The shaft body of the rear-stage semi-open impeller 5 and the electromagnetic bearing assembly 3 form a rigid connection through interference fit; The variable diameter throttling mechanism 2 is connected in series to the main circulation pipeline from the outlet of the condenser 7 to the inlet of the evaporator 6; the variable diameter throttling mechanism 2 includes a variable diameter valve body 12, an actuator 14 and a heat dissipation pipe 15. The actuator 14 is fixedly installed at the top of the outer wall of the variable diameter valve body 12. The heat dissipation pipe 15 is sleeved on the outer wall of the variable diameter valve body 12. The surface of the heat dissipation pipe 15 is provided with spiral fins. The variable diameter valve body 12 includes a valve core and a variable diameter pipe. The valve core and the variable diameter pipe are connected by a threaded locking structure. The output shaft of the actuator 14 is connected to the rear end shaft of the valve core through a cross-slider coupling 16. The data line of the pressure sensor is passed through the wire groove arranged inside the heat dissipation pipe 15, and the data line of the pressure sensor extends to the junction box on the side of the variable diameter valve body 12. A heat-conducting silicone grease layer is filled between the heat dissipation pipe 15 and the variable diameter pipe; Furthermore, first of all, the electromagnetic bearing assembly 3 is centrally installed in the middle of the rotating shaft. The front-stage closed impeller 4 is fixed to the front end of the rotating shaft through a keyway, and the rear-stage semi-open impeller 5 is rigidly connected to the outer wall of the rear end of the shaft body of the electromagnetic bearing assembly 3 through interference fit. The front-stage closed impeller 4 is cast from aluminum alloy, and the rear-stage semi-open impeller 5 is of stainless steel welded structure. The distance between the two-stage impellers is 50 mm, forming a two-stage compression flow channel. 8 groups of sector-shaped neodymium iron boron permanent magnetic blocks are circumferentially embedded in the inner ring of the radial bearing 20, and the polarities of adjacent permanent magnetic blocks are arranged alternately. The outer ring electromagnetic coil is wound with enameled wire. The Hall sensors installed on both sides of the radial bearing 20 are connected to the PID controller through shielded cables. The controller reads the actual displacement voltage signal of the Hall sensor and adjusts the current through the PID algorithm. Then, the outlet of the magnetic levitation compressor 1 is directly connected to the inlet end of the condenser 7 through a seamless steel pipe. The inner wall of the pipeline is polished to a mirror finish, and a pressure sensor is set to monitor the exhaust pressure. The liquid outlet end of the condenser 7 is connected to the inlet of the variable diameter throttling mechanism 2 through a copper pipe. The outlet of the variable diameter throttling mechanism 2 is connected to the inlet of the evaporator 6 through a heat-insulating pipe, forming a high-pressure refrigerant liquid channel. The gas outlet end of the evaporator 6 returns to the inlet of the magnetic levitation compressor 1 through a metal hose with a rubber shock-absorbing layer. The inner diameter of the hose matches the inlet of the compressor, and guide vanes are arranged on the inner wall to reduce air flow disturbance. 6 involute spline grooves are opened on the hub of the front-stage closed impeller 4 and connected to the end of the rotating shaft through a hot-fitted spline sleeve. The inner hole of the hub of the rear-stage semi-open impeller 5 and the shaft body of the electromagnetic bearing assembly 3 are in interference fit. After heating the impeller, it is sleeved on the shaft body, and a rigid connection is formed after cooling.

[0025] Finally, the low-pressure refrigerant steam from the evaporator 6 enters the front-stage closed impeller 4. Under the action of the centrifugal force generated by the high-speed rotation of the impeller, the pressure and temperature are increased. After the flow direction is adjusted by the intermediate guide ring, the steam enters the rear-stage semi-open impeller 5. The compressed high-pressure gas enters the condenser 7 through the compressor outlet pipeline. The high-pressure refrigerant gas in the condenser 7 exchanges heat with the cooling water and condenses into a liquid, which flows into the variable diameter throttling mechanism 2. The unit controller adjusts the flow cross-sectional area of the variable diameter pipe by driving the valve core to rotate through the actuator 14 according to the superheat at the outlet of the evaporator 6, so that the refrigerant flow dynamically matches the load demand. The throttled low-pressure liquid enters the evaporator 6 and evaporates into a gas after absorbing the heat of the chilled water.

[0026] Please refer to Figure 1 、 Figure 3 and Figure 4, an embodiment provided by the present invention: an energy-saving magnetic levitation centrifugal chiller. The heat exchange system includes an evaporator 6, a condenser 7, and a refrigerant circulation pipeline 8. The evaporator 6 is fixedly installed on a support frame 10 on the outer side of the chiller base 9. A column 11 is fixedly installed at the bottom end of the outer wall of the condenser 7, and the column 11 is vertically installed at the top end of the outer wall of the evaporator 6. The evaporator 6 is connected to the chilled water pipeline through a flange interface, and the condenser 7 is connected to the cooling tower water pipeline through a threaded joint; the refrigerant circulation pipeline 8 is arranged in a U-shaped direction along the rear end of the inner wall of the chiller. The refrigerant circulation pipeline 8 includes an outlet pipe section of the magnetic levitation compressor 1, an inlet pipe section of the condenser 7, an inlet pipe section of the evaporator 6, and a return air pipe section of the magnetic levitation compressor 1. The refrigerant circulation pipeline 8 uses a copper hard pipe to connect the outlet of the magnetic levitation compressor 1, the inlet of the shell side of the condenser 7, and the outlet of the tube side of the condenser 7 in sequence. The outlet of the tube side of the condenser 7 is connected to the inlet of the tube side of the evaporator 6 through an electronic expansion valve, and the outlet of the shell side of the evaporator 6 returns to the inlet of the magnetic levitation compressor 1 through a bypass branch of the fluorine pump 17; A waterproof electrical box 29 is arranged inside the chiller base 9. A frequency conversion unit is arranged at the top end of the inner wall of the waterproof electrical box 29. A dual-power supply contactor is arranged at the bottom end of the outer wall of the frequency conversion unit. The output end of the frequency conversion unit is connected to the winding of the magnetic levitation compressor 1 through a shielded cable, and a mechanical interlock is provided in the dual-power supply line; Furthermore, first, the armature of the dual-power supply contactor is mechanically connected through a stainless steel connecting rod. When the main circuit voltage is abnormal, the mechanical interlock connecting rod drives the armature of the other contactor to attract, and at the same time locks the main circuit contactor. Only a single-power supply is connected to the frequency conversion unit. The frequency conversion unit transmits electric energy to the winding of the magnetic levitation compressor 1 through a shielded cable. The magnetic levitation compressor 1 operates, and the refrigerant starts to circulate under the action of the magnetic levitation compressor 1. The magnetic levitation compressor 1 compresses the refrigerant into a high-temperature and high-pressure gas, and transports it to the refrigerant circulation pipeline 8 through the outlet pipe section of the magnetic levitation compressor 1 Then, the high-temperature and high-pressure refrigerant gas follows the U-shaped direction of the refrigerant circulation pipeline 8, enters the inlet pipe section of the condenser 7, and then enters the inlet of the shell side of the condenser 7. In the condenser 7, the refrigerant exchanges heat with the cooling water in the cooling tower water pipeline connected through a threaded joint. Due to the cooling effect of the cooling water, the high-temperature and high-pressure refrigerant gas gradually condenses into a high-temperature and high-pressure liquid. The condensed high-temperature and high-pressure liquid flows out from the outlet of the tube side of the condenser 7 and passes through the electronic expansion valve. The electronic expansion valve controls the flow rate and pressure of the refrigerant according to the setting, and throttles and depressurizes the high-temperature and high-pressure liquid refrigerant into a low-temperature and low-pressure liquid.

[0027] Finally, the low-temperature and low-pressure liquid refrigerant enters the tube-side inlet of the evaporator 6 through the inlet pipe section of the evaporator 6. In the evaporator 6, the refrigerant exchanges heat with the chilled water in the chilled water pipeline connected through the flange interface. The refrigerant absorbs the heat in the chilled water, reducing the temperature of the chilled water, while the refrigerant itself evaporates into a low-temperature and low-pressure gas. The evaporated low-temperature and low-pressure refrigerant gas flows out from the shell-side outlet of the evaporator 6. Part of it passes through the bypass branch of the fluorine pump 17 and, under the action of the fluorine pump 17, returns to the inlet of the magnetic levitation compressor 1.

[0028] Please refer to Figure 1 、 Figure 4 、 Figure 7 and Figure 8 , an embodiment provided by the present invention: an energy-saving magnetic levitation centrifugal chiller. A bypass branch connecting the outlet of the evaporator 6 and the suction pipe section of the magnetic levitation compressor 1 is fixedly installed with a fluorine pump energy-saving mechanism 13. The fluorine pump energy-saving mechanism 13 is connected in parallel with the main pipeline through a three-way valve 19. The fluorine pump energy-saving mechanism 13 includes a fluorine pump 17, a cold storage tank 18, and a three-way valve 19. The outer wall of the cold storage tank 18 is welded with an L-shaped bracket and fixedly installed on the base 9 of the chiller. The two outlets on both sides of the bottom of the three-way valve 19 are respectively connected to the inlet of the variable diameter throttling mechanism 2 and the pipeline of the fluorine pump 17 through threaded interfaces. The inlet of the fluorine pump 17 is connected to the outlet of the fluorine pump 17 side of the three-way valve 19 through a corrugated compensator. The outlet of the fluorine pump 17 is connected to the inlet pipeline of the evaporator 6 through a check valve; the valve core is composed of a hemispherical valve flap connected to the lower end of the valve stem. The top of the valve stem is connected to a stepper motor, and the stepper motor drives the rotation of the valve stem through a toothed belt. There are two annular sealing grooves in the inner cavity of the valve body, which are respectively connected to the variable diameter throttling mechanism 2 and the pipeline of the fluorine pump 17; The inner cavity of the cold storage tank 18 is divided into upper and lower areas. The upper layer is a spiral copper tube heat exchange layer. The two ends of the spiral copper tube heat exchange layer are respectively connected to the outlet pipeline of the fluorine pump 17 and the inlet of the evaporator 6 through quick-installing clamps. The lower layer is filled with a phase change material, and the phase change material is encapsulated in a three-dimensional grid composed of honeycomb aluminum plates; Furthermore, first, the stepper motor drives the rotation of the valve stem through a toothed belt. Since the lower end of the valve stem is connected to a hemispherical valve flap, the rotation of the valve stem causes the hemispherical valve flap to rotate, and the three-way valve 19 opens the channel leading to the fluorine pump energy-saving mechanism 13. Part of the refrigerant at the outlet of the evaporator 6 flows into the fluorine pump energy-saving mechanism 13; the refrigerant enters the upper spiral copper tube heat exchange layer of the cold storage tank 18. The spiral copper tube heat exchange layer increases the flow path and heat exchange area of the refrigerant. During the process of the refrigerant flowing in the spiral copper tube, it exchanges heat with the phase change material filled in the lower layer. The phase change material in the lower layer is encapsulated in a three-dimensional grid composed of honeycomb aluminum plates. During the heat exchange process, the refrigerant releases heat, and the phase change material absorbs heat and undergoes a phase change, storing the cold energy; Then, the refrigerant after heat exchange in the cold storage tank 18 flows out from the spiral copper tube heat exchange layer and reaches the fluorine pump 17 through the pipeline connected by the quick-installation clamp. The inlet of the fluorine pump 17 is connected to the outlet on the fluorine pump 17 side of the three-way valve 19 through a corrugated compensator. The corrugated compensator compensates for the thermal expansion and contraction of the pipeline and the installation error. The fluorine pump 17 pressurizes the refrigerant, overcomes the pipeline resistance and the system pressure, and continues to circulate in the system. The refrigerant at the outlet of the fluorine pump 17 passes through a check valve. The check valve prevents the refrigerant from flowing back, making the refrigerant flow unidirectionally towards the inlet of the evaporator 6. The refrigerant is connected to the inlet pipeline of the evaporator 6 and participates in the refrigeration cycle again. In this process, the cold storage tank 18 stores cold energy in advance, making the temperature of the refrigerant entering the evaporator 6 lower; Finally, when the load of the chiller increases or the external environmental conditions are no longer suitable for using the fluorine pump energy-saving mechanism 13, the stepper motor drives the valve stem to rotate, causing the hemispherical valve flap to change position. The three-way valve 19 switches the regulation degree, closes the channel leading to the fluorine pump energy-saving mechanism 13, and the refrigerant directly flows from the outlet of the evaporator 6 to the suction pipe section of the magnetic levitation compressor 1 through the main pipeline again, restoring the normal refrigeration cycle mode. At the same time, the phase change material in the cold storage tank 18 releases the stored cold energy through heat exchange with the surrounding environment.

[0029] Please refer to Figure 1 , Figure 3 and Figure 5 , an embodiment provided by the present invention: an energy-saving magnetic levitation centrifugal chiller, the electromagnetic bearing assembly 3 includes a radial bearing 20 and an axial bearing 21. Eight groups of electromagnetic coils are equidistantly distributed inside the radial bearing 20. The axial bearing 21 is arranged at the end of the rotor 22. An annular bearing seat is fixedly installed on the inner wall of the housing of the magnetic levitation compressor 1. Eight groups of sector-shaped neodymium iron boron permanent magnets are circumferentially embedded in the inner wall of the annular bearing seat. The magnetic poles of adjacent permanent magnets are arranged alternately as N-S. The electromagnetic coils are circumferentially distributed on the outer surface of the rotor 22 through winding skeletons. Each group of winding skeletons is arranged radially opposite to the permanent magnets. The outer wall of the winding skeleton is wound with enameled copper wire to form electromagnetic coils. The coil leads pass through the axial through hole of the rotor 22 and are connected to an external power supply. Hall sensors are fixedly installed on both sides of the annular bearing seat. A conical thrust plate 23 is fixedly installed at the end of the rotor 22. Axial electromagnets are symmetrically arranged on both sides of the conical thrust plate 23. The electromagnet iron cores are fixed on the inner side of the housing end cover by bolts. A working air gap of 1.2 - 1.5 mm is formed between the end face of the iron core and the conical thrust plate 23; A two-way pressure stabilizing pipeline structure is arranged between the magnetic levitation compressor 1 and the evaporator 6. The two-way pressure stabilizing pipeline structure includes a Y-shaped shunt 30 and a three-dimensional shock-absorbing bellows 31. The Y-shaped shunt 30 is arranged at the outlet end of the magnetic levitation compressor 1, and the three-dimensional shock-absorbing bellows 31 is arranged in the return air pipe section. The two outlet branch pipes of the Y-shaped shunt 30 are respectively connected to the inlet of the shell side of the condenser 7 and the bypass interface of the fluorine pump energy-saving mechanism 13. A transition pipe section with guide ribs is arranged between the flange end face of the three-dimensional shock-absorbing bellows 31 and the suction port of the magnetic levitation compressor 1, and a ring-shaped rectifying grid is arranged on the inner wall of the transition pipe section; Further, first, an external power supply supplies power to the electromagnetic coils in the electromagnetic bearing assembly 3. Since 8 groups of electromagnetic coils are evenly distributed inside the radial bearing 20, and each winding skeleton is radially aligned with 8 groups of sector-shaped neodymium iron boron permanent magnets circumferentially embedded in the inner wall of the annular bearing seat, a mutually interacting magnetic field force is generated between the energized electromagnetic coils and the permanent magnets. The magnetic poles of adjacent permanent magnets are arranged in an alternating N-S pattern, making the magnetic field force distribution between the electromagnetic coils and the permanent magnets uniform and stable, providing a radial magnetic levitation support force for the rotor 22. The rotor 22 is magnetically levitated inside the magnetic levitation compressor 1 in the radial direction. Hall sensors fixedly installed on both sides of the annular bearing seat monitor the position and magnetic field change of the rotor 22. The Hall sensors feed back the monitored signals to the control system, and the control system dynamically adjusts the magnitude and direction of the current in the electromagnetic coils according to the feedback signals to control the radial magnetic levitation position of the rotor 22. The gap between the rotor 22 and the shell of the magnetic levitation compressor 1 is uniform. In the axial direction, the conical thrust disk 23 fixedly installed at the end of the rotor 22 cooperates with the axially symmetrically arranged axial electromagnets. The iron cores of the axial electromagnets are fixed to the inner side of the shell end cover by bolts. When the axial electromagnets are energized, a working air gap of 1.2 - 1.5 mm is formed between the end face of the iron core and the conical thrust disk 23, and an axial magnetic field force is generated in this air gap to provide an axial magnetic levitation support force for the rotor 22.

[0030] Then, the magnetic levitation compressor 1 compresses the refrigerant. The refrigerant gas at low temperature and low pressure enters the magnetic levitation compressor 1 from the evaporator 6 through the two-way pressure stabilizing pipeline structure. Before entering the magnetic levitation compressor 1, the refrigerant first passes through the three-dimensional shock-absorbing bellows 31 to absorb the vibration and impact generated during the refrigerant flow. After passing through the three-dimensional shock-absorbing bellows 31, the refrigerant enters the suction port of the magnetic levitation compressor 1 through the transition pipe section with guide ribs. The inner wall of the transition pipe section is provided with a ring-shaped rectifying grid. The guide ribs and the ring-shaped rectifying grid rectify and guide the flow of the refrigerant, so that the refrigerant enters the magnetic levitation compressor 1 evenly and stably. The refrigerant entering the magnetic levitation compressor 1 is compressed into a gas at high temperature and high pressure. The compressed refrigerant gas at high temperature and high pressure is discharged from the outlet end of the magnetic levitation compressor 1 and passes through the Y-shaped shunt 30. The two outlet branches of the Y-shaped shunt 30 are respectively connected to the shell-side inlet of the condenser 7 and the bypass interface of the fluorine pump energy-saving mechanism 13. Part of the refrigerant gas enters the shell side of the condenser 7 through one outlet branch of the Y-shaped shunt 30, exchanges heat with the cooling water in the condenser 7, and condenses into a liquid refrigerant after releasing heat. The other part of the refrigerant gas enters the bypass interface of the fluorine pump energy-saving mechanism 13 through the other outlet branch of the Y-shaped shunt 30 and participates in the energy-saving cycle process of the fluorine pump energy-saving mechanism 13.

[0031] Finally, the liquid refrigerant coming out of the condenser 7 undergoes throttling and pressure reduction and then enters the evaporator 6. In the evaporator 6, the liquid refrigerant absorbs the heat of the chilled water and evaporates into a gas at low temperature and low pressure. The cooled chilled water is transported to the place where refrigeration is required. The refrigerant that has undergone the energy-saving cycle of the fluorine pump energy-saving mechanism 13 flows out of the fluorine pump energy-saving mechanism 13 and then flows along the connecting pipeline to the Y-shaped shunt 30 to continue to participate in the refrigeration process.

[0032] Please refer to Figure 1 、 Figure 3 and Figure 6 As shown in The refrigerant circulation pipeline 8 is integrated with an adaptive flow guiding mechanism 32 at the outlet of the tube side of the condenser 7. The adaptive flow guiding mechanism 32 includes a rotatable flow guiding cone 33 and an annular adjusting ring 34. The flow guiding cone 33 is linked with the actuator 14 through a connecting rod. The inner wall of the annular adjusting ring 34 is provided with radially telescopic flow guiding vanes. The telescopic stroke of the flow guiding vanes forms a mechanical interlock with the valve core opening of the variable diameter throttling mechanism 2. A spiral guide groove 35 is formed on the outer surface of the flow guiding cone 33, and the spiral guide groove 35 guides the refrigerant flow to the inlet of the evaporator 6; Further, first, solid or granular medicine is injected into the mixing barrel 24 through the medicine adding port 2. After the medicine falls into the mixing barrel 24, the stainless steel baffles on the inner sides of the upper and lower rows of rectangular openings on the outer wall of the central cylinder 26 are turned downward due to the gravity of the medicine, and the medicine enters the annular cavity between the central cylinder 26 and the inner wall of the mixing barrel 24. The main shaft motor installed at the bottom of the mixing barrel 24 is started, and the main shaft drives the cutter head 27 to rotate at a high speed. The conical teeth at the bottom end of the outer wall of the annular crushing plate 28 initially crush the medicine particles with a particle size > 5 mm. After the particles are hit by the cutter head 27 at a high speed and fly towards the barrel wall, they collide with the conical teeth for the second time. The crushed medicine solution converges to the bottom of the mixing barrel 24 through the through holes in the middle of the annular crushing plate 28 under the action of the centrifugal force generated by the rotation of the cutter head 27, and is transported to the premixing chamber of the refrigerant circulation pipeline 8 by the medicine delivery pump through the quick coupling; Then, when the refrigerant flows through the outlet of the tube side of the condenser 7, the actuator 14 drives the flow guiding cone 33 to move axially through the connecting rod. When the valve core opening of the variable diameter throttling mechanism 2 increases, the actuator 14 pushes the flow guiding cone 33 towards the outlet direction of the condenser 7, and the distance between the tip of the flow guiding cone 33 and the inner wall of the outlet pipe expands, reducing the refrigerant flow resistance; when the valve core opening decreases, the flow guiding cone 33 moves in the reverse direction, and the tip inserts into the outlet pipe, forming a flow guiding contraction for the high-speed refrigerant. The flow guiding vanes on the inner wall of the annular adjusting ring 34 are rigidly connected with the valve core rod of the variable diameter throttling mechanism 2 through a connecting rod. When the vanes are fully extended, the ends of the vanes fit with the spiral guide groove 35 on the outer surface of the flow guiding cone 33, guiding the refrigerant to flow towards the inlet of the evaporator 6 along a spiral path; when the vanes contract, the refrigerant is quickly guided through the straight section of the guide groove 35, reducing the flow pressure drop; Finally, at a load rate of 30% - 70%, when the medicine delivery pump of the mixing barrel 24 is started, the intelligent controller synchronously sends a signal to the actuator 14 to fix the flow guiding cone 33 at the middle position to avoid vortex loss during the guiding process of the medicine solution. After the medicine delivery pump of the mixing barrel 24 stops, the stainless steel baffle of the central cylinder 26 automatically resets and closes by relying on the torsion spring to prevent the refrigerant vapor from flowing back into the mixing barrel 24; the annular crushing plate 28 is fixed to the barrel wall through four support rods to form an inclined installation angle of 45°, and the spiral guide groove 35 of the flow guiding cone 33 is treated with mirror polishing.

[0033] Working principle: First, the electromagnetic bearing assembly 3 of the magnetic levitation compressor 1 uses the magnetic levitation force generated by the radial electromagnetic coil and the permanent magnet block to support the rotor 22 without contact. The front-stage closed impeller 4 and the rear-stage semi-open impeller 5 perform double-stage compression on the refrigerant during high-speed rotation. The compressed high-temperature and high-pressure gaseous refrigerant directly enters the condenser 7 through the outlet pipe section; Then, the high-temperature refrigerant exchanges heat with the circulating cooling water of the cooling tower in the shell side of the condenser 7 and condenses into high-pressure liquid refrigerant. The liquid refrigerant adjusts the flow rate through the variable-diameter throttling mechanism 2. The actuator 14 drives the valve core to change the diameter of the variable-diameter pipe through the coupling 16. Combining the fin heat dissipation of the heat dissipation pipe 15 and the throttling of the thermal conductive silicone grease layer, the throttled low-temperature and low-pressure refrigerant enters the tube side of the evaporator 6 and absorbs the heat of the chilled water to complete vaporization. When the load decreases, the three-way valve 19 switches to the fluorine pump 17 branch. The phase change material in the cold storage tank 18 releases the stored cold through the spiral copper pipe. The fluorine pump 17 drives the refrigerant to return to the compressor inlet through the bypass, reducing the compressor operation time. The adaptive flow guiding mechanism 32 synchronously adjusts the angle of the flow guiding cone 33 and the telescopic stroke of the flow guiding vane through the interlock mechanism; Finally, the gaseous refrigerant returns to the compressor through the two-way pressure stabilizing pipeline. The Y-shaped shunt 30 balances the flow distribution. The three-dimensional shock-absorbing bellows 31 and the rectifying grid eliminate the pressure pulsation. The frequency conversion unit adjusts the compressor speed in real time according to the feedback of the Hall sensor. The mixing barrel 24 continuously processes the impurities in the circulating water through the cutter head 27 and the crushing plate 28.

[0034] For those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or basic characteristics of the present invention. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present invention. Any reference signs in the claims should not be regarded as limiting the claimed claims.

Claims

1. An energy-saving magnetic levitation centrifugal chiller, characterized in that: It includes a magnetic levitation compressor (1), a variable-diameter throttling mechanism (2) and a heat exchange system. The heat exchange system is fixedly installed on the outer wall side of the magnetic levitation compressor (1), and the variable-diameter throttling mechanism (2) is fixedly installed on the outer wall side of the heat exchange system. The outlet of the magnetic levitation compressor (1) is directly connected to the heat exchange system through a pipeline, and the variable-diameter throttling mechanism (2) is connected to the heat exchange system through a pipeline; The magnetic levitation compressor (1) includes an electromagnetic bearing assembly (3), a front-stage closed impeller (4) and a rear-stage semi-open impeller (5). The electromagnetic bearing assembly (3), the front-stage closed impeller (4) and the rear-stage semi-open impeller (5) are coaxially linearly arranged along the same rotating shaft. The electromagnetic bearing assembly (3) is centrally arranged in the middle of the rotating shaft. The hub of the front-stage closed impeller (4) is fixedly connected to the end of the rotating shaft by a key connection. The rear-stage semi-open impeller (5) is fixedly installed at the rear end of the outer wall of the electromagnetic bearing assembly (3). The shaft body of the rear-stage semi-open impeller (5) and the electromagnetic bearing assembly (3) form a rigid connection through interference fit.

2. The energy-saving magnetic levitation centrifugal chiller according to claim 1, wherein: The variable-diameter throttling mechanism (2) is connected in series to the main circulation pipeline from the outlet of the condenser (7) to the inlet of the evaporator (6); The variable-diameter throttling mechanism (2) includes a variable-diameter valve body (12), an actuator (14) and a heat dissipation pipe (15). The actuator (14) is fixedly installed at the top of the outer wall of the variable-diameter valve body (12). The heat dissipation pipe (15) is sleeved on the outer wall of the variable-diameter valve body (12). The surface of the heat dissipation pipe (15) is provided with spiral fins. The variable-diameter valve body (12) includes a valve core and a variable-diameter pipe. The valve core and the variable-diameter pipe are connected by a threaded locking structure. The output shaft of the actuator (14) is connected to the rear end shaft of the valve core through a cross-slider coupling (16). The data line of the pressure sensor is passed through the wire groove arranged inside the heat dissipation pipe (15), and the data line of the pressure sensor extends to the junction box on the side of the variable-diameter valve body (12). A thermal conductive silicone grease layer is filled between the heat dissipation pipe (15) and the variable-diameter pipe.

3. An energy-saving magnetic levitation centrifugal chiller according to claim 1, characterized in that: The heat exchange system includes an evaporator (6), a condenser (7) and a refrigerant circulation pipeline (8). The evaporator (6) is fixedly installed on the support frame (10) on the outer wall side of the base (9) of the water chiller. A column (11) is fixedly installed at the bottom end of the outer wall of the condenser (7). The column (11) is vertically installed at the top end of the outer wall of the evaporator (6). The evaporator (6) is connected to the chilled water pipeline through a flange interface, and the condenser (7) is connected to the cooling tower water pipeline through a threaded joint; The refrigerant circulation pipeline (8) is arranged in a U-shaped trend along the rear end of the inner wall of the water chiller. The refrigerant circulation pipeline (8) includes an outlet pipe section of the magnetic levitation compressor (1), an inlet pipe section of the condenser (7), an inlet pipe section of the evaporator (6) and a return air pipe section of the magnetic levitation compressor (1). The refrigerant circulation pipeline (8) uses a copper hard pipe to connect the outlet of the magnetic levitation compressor (1), the inlet of the shell side of the condenser (7) and the outlet of the tube side of the condenser (7) in sequence. The outlet of the tube side of the condenser (7) is connected to the inlet of the tube side of the evaporator (6) through an electronic expansion valve. The outlet of the shell side of the evaporator (6) returns to the inlet of the magnetic levitation compressor (1) through a bypass branch of the fluorine pump (17).

4. The energy-saving magnetic levitation centrifugal chiller according to claim 2, characterized in that: A bypass branch connecting the outlet of the evaporator (6) to the suction pipe section of the magnetic levitation compressor (1) is fixedly installed with a fluorine pump energy-saving mechanism (13). The fluorine pump energy-saving mechanism (13) is connected in parallel with the main pipeline through a three-way valve (19). The fluorine pump energy-saving mechanism (13) includes a fluorine pump (17), a cold storage tank (18), and a three-way valve (19). The outer wall of the cold storage tank (18) is welded with an L-shaped bracket and fixedly installed on the base (9) of the chiller. The two bottom outlets of the three-way valve (19) are respectively connected to the inlet of the variable-diameter throttling mechanism (2) and the pipeline of the fluorine pump (17) through threaded interfaces. The inlet of the fluorine pump (17) is connected to the fluorine pump (17) side outlet of the three-way valve (19) through a corrugated compensator. The outlet of the fluorine pump (17) is connected to the inlet pipeline of the evaporator (6) through a check valve. The valve core consists of a hemispherical valve flap connected to the lower end of the valve stem. The top of the valve stem is connected to a stepping motor, and the stepping motor drives the rotation of the valve stem through a toothed belt. There are two annular sealing grooves in the inner cavity of the valve body, which are respectively connected to the variable-diameter throttling mechanism (2) and the pipeline of the fluorine pump (17).

5. An energy-saving magnetic levitation centrifugal chiller according to claim 1, characterized in that: The electromagnetic bearing assembly (3) includes a radial bearing (20) and an axial bearing (21). There are 8 groups of electromagnetic coils evenly distributed inside the radial bearing (20). The axial bearing (21) is arranged at the end of the rotor (22). An annular bearing seat is fixedly installed on the inner wall of the housing of the magnetic levitation compressor (1). 8 groups of sector-shaped neodymium iron boron permanent magnets are circumferentially embedded in the inner wall of the annular bearing seat. The magnetic poles of adjacent permanent magnets are arranged alternately as N-S. The electromagnetic coils are circumferentially distributed on the outer surface of the rotor (22) through winding skeletons. Each winding skeleton is arranged radially opposite to the permanent magnet. The outer wall of the winding skeleton is wound with enameled copper wire to form an electromagnetic coil. The coil leads pass through the axial through hole of the rotor (22) and are connected to an external power supply. Hall sensors are fixedly installed on both sides of the annular bearing seat. A conical thrust disk (23) is fixedly installed at the end of the rotor (22). Axial electromagnets are symmetrically arranged on both sides of the conical thrust disk (23). The electromagnet iron cores are fixed inside the housing end cover through bolts, and a working air gap of 1.2 - 1.5 mm is formed between the end face of the iron core and the conical thrust disk (23).

6. The energy-saving magnetic levitation centrifugal chiller according to claim 4, characterized in that: The inner cavity of the cold storage tank (18) is divided into upper and lower zones. The upper layer is a spiral copper tube heat exchange layer. The two ends of the spiral copper tube heat exchange layer are respectively connected to the outlet pipeline of the fluorine pump (17) and the inlet of the evaporator (6) through quick-installation clamps. The lower layer is filled with a phase change material, and the phase change material is encapsulated in a three-dimensional grid composed of honeycomb aluminum plates.

7. An energy-saving magnetic levitation centrifugal chiller according to claim 1, characterized in that: A stirring barrel (24) is arranged on the outer wall side of the magnetic levitation compressor (1). A medicine adding port (25) with a threaded cap is fixedly installed at the top of the outer wall of the stirring barrel (24). The bottom of the outer wall of the stirring barrel (24) is connected to a medicine delivery pump through a quick-installation joint. A central cylinder (26) is coaxially arranged inside the stirring barrel (24). On the outer wall of the central cylinder (26), there are two rows of rectangular openings distributed staggeredly up and down. Inside the openings, there are stainless steel baffles with spring return hinges. At the bottom end of the inner wall of the mixing barrel (24), a cutter head (27) is fixedly installed. The bottom of the cutter head (27) penetrates and installs the main shaft. 10 mm above the cutter head (27), an annular crushing plate (28) is fixedly installed. The annular crushing plate (28) is fixed to the inner wall of the mixing barrel (24) through four support rods. At the bottom end of the outer wall of the annular crushing plate (28), there are conical teeth distributed at equal angles.

8. The energy-saving magnetic levitation centrifugal chiller according to claim 3, wherein: Inside the base (9) of the chiller, there is a waterproof electrical box (29). At the top end of the inner wall of the waterproof electrical box (29), there is a frequency conversion unit. At the bottom end of the outer wall of the frequency conversion unit, there is a dual-power supply contactor. The output end of the frequency conversion unit is connected to the winding of the magnetic levitation compressor (1) through a shielded cable. There is a mechanical interlock in the dual-power supply line.

9. An energy-saving magnetic levitation centrifugal chiller according to claim 1, characterized in that: Between the magnetic levitation compressor (1) and the evaporator (6), there is a two-way voltage stabilizing pipeline structure, which includes a Y-shaped shunt (30) and a three-dimensional shock-absorbing bellows (31). The Y-shaped shunt (30) is arranged at the outlet end of the magnetic levitation compressor (1). The three-dimensional shock-absorbing bellows (31) is arranged in the return air pipe section. The two outlet branch pipes of the Y-shaped shunt (30) are respectively connected to the inlet of the shell side of the condenser (7) and the bypass interface of the fluorine pump energy-saving mechanism (13). Between the flange end face of the three-dimensional shock-absorbing bellows (31) and the suction port of the magnetic levitation compressor (1), there is a transition pipe section with guide ribs. The inner wall of the transition pipe section is provided with an annular rectifying grid.

10. The energy-saving magnetic levitation centrifugal chiller according to claim 3, wherein: At the outlet of the tube side of the condenser (7) in the refrigerant circulation pipeline (8), an adaptive flow guiding mechanism (32) is integrated. The adaptive flow guiding mechanism (32) includes a rotatable flow guiding cone (33) and an annular adjusting ring (34). The flow guiding cone (33) is linked with the actuator (14) through a connecting rod. The inner wall of the annular adjusting ring (34) is provided with radially telescopic flow guiding vanes. The telescopic stroke of the flow guiding vanes forms a mechanical interlock with the valve core opening of the variable diameter throttling mechanism (2). The outer surface of the flow guiding cone (33) is provided with a spiral guide groove (35), and the spiral guide groove (35) guides the refrigerant flow to the inlet of the evaporator (6).

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