Magnetic suspension screw refrigeration compressor

Abstract

A magnetic levitation screw refrigeration compressor is characterized by being composed of at least a body component (1), a drive rotor (2), a driven rotor (3), a magnetic coupling (7), a radial permanent magnet bearing (8), and a bidirectional permanent magnet axial thrust bearing (9) forming an integral whole. Its beneficial effects are: eliminating the frictional power consumption of the rotating moving parts of the compressor, realizing oil-free lubrication operation, eliminating the defects of oil film thermal resistance and increased pressure drop due to the filter screen, realizing full adaptability to refrigerants and zero leakage, simplifying the refrigeration cycle system, saving resources, and greatly improving the performance and reliability of the compressor.

Description

Technical Field

[0001] The invention relates to a screw refrigeration compressor in the field of air conditioning and refrigeration, in particular to a magnetic suspension screw refrigeration compressor. Background Art

[0002] In the field of air conditioning and refrigeration, screw refrigeration compressors are widely used. There are two types of screw refrigeration compressors: open type and closed type. The difference between the two is whether the connection between the motor and the compressor is through a coupling. The open type is independent of the coupling and mechanical seal, and the closed type is the direct connection of the two in the same cavity without a coupling. The closed type is divided into a detachable semi-closed type and a non-detachable fully closed type.

[0003] Open and closed types each have their own advantages and disadvantages:

[0004] 1. In terms of air tightness, the closed screw refrigeration compressor is created to overcome the mechanical seal leakage defect of the open screw refrigeration compressor.

[0005] The open screw refrigeration compressor and the drive motor are independent of each other and connected by a coupling. Due to the airtightness requirements of the refrigeration compressor refrigerant, its mechanical seal requires high reliability. Mechanical seals have defects such as leakage due to wear and aging of seals, friction heat and additional loss of work.

[0006] The closed screw refrigeration compressor overcomes the defect of mechanical seal leakage in the open screw refrigeration compressor, has extremely high air tightness and achieves zero leakage.

[0007] 2. In terms of the adaptability of refrigerants, closed and open types have their own adaptability.

[0008] Open screw refrigeration compressors are only suitable for low-priced single refrigerants such as R717 and R22, and are not suitable for diverse mixed refrigerants of different proportions such as R407C.

[0009] Because R717 has a chemical corrosion effect on the metal copper wire of the motor winding, the closed screw refrigeration compressor is suitable for most refrigerants except R717. R717 is a natural refrigerant that does not damage the ozone layer and has no greenhouse effect. The currently widely used R22 has the problem of refrigerant replacement.

[0010] 3. In terms of the quality requirements for refrigerants and lubricants, the closed type has higher requirements than the open type.

[0011] The motor and refrigerant of the closed screw refrigeration compressor are in the same cavity, and the quality of the refrigerant and lubricant, such as the water content, is extremely high. In the manufacturing process of the closed screw refrigeration compressor, not only the motor winding must be insulated and dried above Class E, but the system must also be tightly vacuumed. Even so, the motor sometimes burns out due to the water content of the medium and the large cantilever deflection of the motor rotor. This defect does not exist in the open type.

[0012] 4. In terms of whether the drive motor cooling method consumes refrigeration capacity, the closed type is not as good as the open type.

[0013] When the screw refrigeration compressor is turned on and driven by an electric motor, the drive motor is cooled by ambient air or water and no refrigeration capacity is consumed.

[0014] The motor and refrigerant of the closed screw refrigeration compressor are in the same cavity, and the drive motor is cooled by the liquid or low-temperature gas of the refrigerant. The closed type has the defects of increasing the system heat load and consuming refrigeration capacity.

[0015] 5. In terms of the diversity of drive motor load power, the closed type is not as good as the open type.

[0016] The screw refrigeration compressor and the driver are independent of each other, and the driver load power can be selected according to different power requirements under different operating conditions.

[0017] The driving motor load power of a closed screw refrigeration compressor is generally selected according to the maximum operating condition of the air conditioner. When the operating condition changes, the load power cannot be changed, which has the defect of a big horse pulling a small cart.

[0018] 6. In terms of drive engine diversity, the closed type is not as good as the open type.

[0019] Open screw refrigeration compressors can be driven by electric motors, gas engines and oil engines, while closed screw refrigeration compressors can only be driven by electric motors.

[0020] The screw compressor utilizes a pair of mutually meshing driving rotors 2 and driven rotors 3 with specific convex and concave tooth shapes installed in the body 102, which produce periodic volume changes during rotation to achieve the functions of sucking, compressing and exhausting gaseous media.

[0021] Depend on Figure 1 and Figure 3The closed screw refrigeration compressor is at least composed of a body 102, an exhaust end seat 103, an exhaust end cover 104, an end cover 105, a motor end cover 107, a driving rotor 2, a driving rotor suction end radial rolling bearing 21, a driving rotor suction end sleeve 22, a driving rotor exhaust end sleeve 23, a driving rotor exhaust end radial rolling bearing 24, a driving rotor exhaust end clearance adjustment ring 25, a driving rotor exhaust end axial thrust bearing 26, a driving rotor exhaust end bearing cover 27, and a driving rotor exhaust end butterfly spring 28. , a locking nut 29 at the exhaust end of the driving rotor, a driven rotor 3, a radial rolling bearing 31 at the intake end of the driven rotor, a sleeve 32 at the intake end of the driven rotor, a sleeve 33 at the exhaust end of the driven rotor, a radial rolling bearing 34 at the exhaust end of the driven rotor, a clearance adjustment ring 35 at the exhaust end of the driven rotor, an axial thrust bearing 36 at the exhaust end of the driven rotor, a bearing cover 37 at the exhaust end of the driven rotor, a butterfly spring 38 at the exhaust end of the driven rotor, a locking nut 39 at the exhaust end of the driven rotor, an oil separator component 4, a semi-enclosed motor 5 and other parts.

[0022] The oil separator component 4 is composed of at least a cylinder 401 and a stainless steel wire filter 402;

[0023] The semi-enclosed motor 5 is composed of a motor stator 501 and a motor rotor 502 .

[0024] Depend on Figure 2 and Figure 3 The screw refrigeration compressor is at least composed of a body 102, an exhaust end seat 103, an exhaust end cover 104, an end cover 105, a pointer seat 106, an intake end seat 108, an intake end cover 109, a shaft seal seat 110, a mechanical seal 6, a driving rotor 2, a driving rotor intake end radial rolling bearing 21, a driving rotor intake end sleeve 22, a driving rotor exhaust end sleeve 23, a driving rotor exhaust end radial rolling bearing 24, a driving rotor exhaust end clearance adjustment ring 25, a driving rotor exhaust end axial thrust bearing 26, and a driving rotor exhaust end. The driven rotor exhaust end bearing cover 27, the driving rotor exhaust end butterfly spring 28, the driving rotor exhaust end locking nut 29, the driven rotor 3, the driven rotor suction end radial rolling bearing 31, the driven rotor suction end sleeve 32, the driven rotor exhaust end sleeve 33, the driven rotor exhaust end radial rolling bearing 34, the driven rotor exhaust end clearance adjustment ring 35, the driven rotor exhaust end axial thrust bearing 36, the driven rotor exhaust end bearing cover 37, the driven rotor exhaust end butterfly spring 38, the driven rotor exhaust end locking nut 39 and other parts.

[0025] The mechanical seal 6 is composed of a carbide static ring 601, a static ring sealing ring 602, a graphite dynamic ring 603, a dynamic ring sealing ring 604, a spring 605, and a dynamic ring seat 606. There is friction power consumption between the dynamic and static rings, and oil spray lubrication and cooling are required.

[0026] The existing screw refrigeration compressors are all equipped with radial rolling bearings and axial thrust bearings, which have friction power consumption and require oil injection lubrication and cooling. The oil circulation system is complex and has many components. For example, an oil separator, oil cooler and circulating oil pump need to be installed in the system, and oil return is difficult. For example, the full liquid evaporator in the system has the defects of insufficient oil and gas separation, increased oil film thermal resistance in the condenser and evaporator, and increased pressure drop in the filter. Summary of the invention

[0027] In order to solve the defects of the open screw refrigeration compressor and the closed screw refrigeration compressor in the prior art and to improve and develop their respective advantages, the present invention proposes a magnetic suspension screw refrigeration compressor.

[0028] When a screw refrigeration (air conditioning) compressor operates under different working conditions, the radial forces and axial forces exerted on the driving rotor 2 and the driven rotor 3 are different in magnitude and direction.

[0029] The technical solution adopted by the present invention to solve the technical problem is: at least a body component 1, a driving rotor 2, a driven rotor 3, a magnetic coupling 7, a radial permanent magnetic bearing 8 and a bidirectional permanent magnetic axial thrust bearing 9 constitute an integral body, and its characteristics are:

[0030] The connecting body 101, the machine body 102, the exhaust end seat 103, the exhaust end cover 104, the end cover 105, and the muffler 111 are connected to form a machine body part by screws;

[0031] The driving rotor 2, the driving rotor suction end radial permanent magnetic bearing 201, the driving rotor suction end shaft sleeve 22, the driving rotor exhaust end shaft sleeve 23, the driving rotor exhaust end radial permanent magnetic bearing 202, the driving rotor exhaust end clearance adjustment ring 203, the driving rotor exhaust end bidirectional permanent magnetic axial thrust bearing 204, the driving rotor exhaust end bearing gland 27, the driving rotor exhaust end butterfly spring 28, and the driving rotor exhaust end locking nut 29 are assembled to form the driving rotor components;

[0032] The driven rotor 3, the driven rotor suction end radial permanent magnetic bearing 301, the driven rotor suction end shaft sleeve 32, the driven rotor exhaust end shaft sleeve 33, the driven rotor exhaust end radial permanent magnetic bearing 302, the driven rotor exhaust end clearance adjustment ring 303, the driven rotor exhaust end bidirectional permanent magnetic axial thrust bearing 304, the driven rotor exhaust end bearing gland 37, the driven rotor exhaust end butterfly spring 38, and the driven rotor exhaust end locking nut 39 are assembled to form the driven rotor component;

[0033] The driving coupling 701, the shielding cover 702, the outer rotating body 703, the outer magnetic shoe 704, the inner rotating body 705, and the inner magnetic shoe 706 are combined to form a magnetic coupling;

[0034] The outer ring body 801, the outer magnetic ring 802, the outer magnetic ring pressure ring 803, the inner ring body 804, the inner magnetic ring 805, and the inner magnetic ring pressure ring 806 are combined to form a radial permanent magnetic bearing;

[0035] The outer ring inlay 901, the static magnetic ring 902, the outer pressure ring 903, the inner ring inlay 904, the thrust magnetic ring 905 and the inner pressure ring 906 form a bidirectional permanent magnetic axial thrust bearing.

[0036] Under the action of the magnetic force of the radial permanent magnetic bearing 201 at the driving rotor suction end and the radial permanent magnetic bearing 202 at the driving rotor exhaust end, the driving rotor 2 is suspended.

[0037] Under the action of the magnetic force of the radial permanent magnetic bearing 301 at the suction end of the driven rotor and the radial permanent magnetic bearing 302 at the exhaust end of the driven rotor, the driven rotor 3 is suspended.

[0038] Under the joint action of the bidirectional permanent magnet axial thrust bearing 204 at the exhaust end of the driving rotor, the bearing cover 27 at the exhaust end of the driving rotor, the butterfly spring 28 at the exhaust end of the driving rotor, and the locking nut 29 at the exhaust end of the driving rotor, the driving rotor 2 achieves a balance of bidirectional axial forces.

[0039] Under the joint action of the bidirectional permanent magnet axial thrust bearing 304 at the exhaust end of the driven rotor, the bearing cover 37 at the exhaust end of the driven rotor, the butterfly spring 38 at the exhaust end of the driven rotor, and the locking nut 39 at the exhaust end of the driven rotor, the driven rotor 3 achieves a balance of bidirectional axial forces.

[0040] Under the isolation effect of the shielding cover 702, the screw refrigeration compressor achieves zero leakage of static sealing and full adaptability of refrigerant.

[0041] The beneficial effects of the present invention are: eliminating the friction power consumption of the rotating moving parts of the compressor, achieving oil-free lubrication operation, eliminating the defects of oil film thermal resistance and increased pressure drop of the filter, achieving comprehensive adaptability and zero leakage to the refrigerant, simplifying the refrigeration cycle system and saving resources, and greatly improving the performance and reliability of the compressor. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0043] Figure 1 The invention is a horizontal cross-sectional view of an example of a semi-enclosed screw refrigeration (air conditioning) compressor in the prior art.

[0044] Figure 2 It is a horizontal cross-sectional view of an example of an open screw refrigeration (air conditioning) compressor in the prior art.

[0045] Figure 3The present invention is a horizontal cross-sectional view of an example of a rotor component of a screw refrigeration (air conditioning) compressor in the prior art.

[0046] Figure 4 It is a horizontal cross-sectional view of an embodiment of a magnetically suspended screw refrigeration (air conditioning) compressor of the present invention.

[0047] Figure 5 It is a horizontal cross-sectional view of an embodiment of a rotor component of a magnetically suspended screw refrigeration (air conditioning) compressor of the present invention.

[0048] Figure 6 The present invention is an axial cross-sectional view of an embodiment of a magnetic coupling of a magnetically suspended screw refrigeration (air conditioning) compressor.

[0049] Figure 7 The invention is an embodiment of a radial permanent magnetic bearing of a magnetically suspended screw refrigeration (air conditioning) compressor.

[0050] Figure 8 The invention is an embodiment of a bidirectional permanent magnetic axial thrust bearing of a magnetically suspended screw refrigeration (air conditioning) compressor.

[0051] Fig. 9 It is another embodiment of the radial permanent magnetic bearing of a magnetic suspension screw refrigeration (air conditioning) compressor of the present invention.

[0052] Fig.10 It is another embodiment of the bidirectional permanent magnetic axial thrust bearing of a magnetic suspension screw refrigeration (air conditioning) compressor of the present invention.

[0053] In the figure: 1. body parts, 2. driving rotor, 3. driven rotor, 4. oil separator parts, 5. semi-enclosed motor, 6. mechanical seal, 7. magnetic coupling, 8. radial permanent magnetic bearing, 9. bidirectional permanent magnetic axial thrust bearing;

[0054] 21. Driving rotor suction end radial rolling bearing, 22. Driving rotor suction end shaft sleeve, 23. Driving rotor exhaust end shaft sleeve, 24. Driving rotor exhaust end radial rolling bearing, 25. Driving rotor exhaust end clearance adjustment ring, 26. Driving rotor exhaust end axial thrust bearing, 27. Driving rotor exhaust end bearing gland, 28. Driving rotor exhaust end butterfly spring, 29. Driving rotor exhaust end locking nut;

[0055] 31. Radial rolling bearing at the suction end of the driven rotor, 32. Bushing at the suction end of the driven rotor, 33. Bushing at the exhaust end of the driven rotor, 34. Radial rolling bearing at the exhaust end of the driven rotor, 35. Clearance adjustment ring at the exhaust end of the driven rotor, 36. Axial thrust bearing at the exhaust end of the driven rotor, 37. Bearing gland at the exhaust end of the driven rotor, 38. Butterfly spring at the exhaust end of the driven rotor, 39. Locking nut at the exhaust end of the driven rotor;

[0056] 101. Connector, 102. Machine body, 103. Exhaust end seat, 104. Exhaust end cover, 105. End cover, 106. Pointer seat, 107. Motor end cover, 108. Intake end seat, 109. Intake end cover, 110. Shaft seal seat, 111. Muffler;

[0057] 201. Driving rotor suction end radial permanent magnetic bearing, 202. Driving rotor exhaust end radial permanent magnetic bearing, 203. Driving rotor exhaust end clearance adjustment ring, 204. Driving rotor exhaust end bidirectional permanent magnetic axial thrust bearing;

[0058] 301. radial permanent magnetic bearing at the suction end of the driven rotor, 302. radial permanent magnetic bearing at the exhaust end of the driven rotor, 303. clearance adjustment ring at the exhaust end of the driven rotor, 304. bidirectional permanent magnetic axial thrust bearing at the exhaust end of the driven rotor;

[0059] 401. Cylinder, 402. Stainless steel wire filter;

[0060] 501. Motor stator, 502. Motor rotor;

[0061] 601. Carbide static ring, 602. Static ring seal, 603. Graphite dynamic ring, 604. Dynamic ring seal, 605. Spring, 606. Dynamic ring seat;

[0062] 701. driving coupling, 702. shielding cover, 703. outer rotating body, 704. outer magnetic tile, 705. inner rotating body, 706. inner magnetic tile;

[0063] 801. outer ring body, 802. outer magnetic ring, 803. outer magnetic ring pressure ring, 804. inner ring body, 805. inner magnetic ring, 806. inner magnetic ring pressure ring;

[0064] 901. Outer ring inlay, 902. Static magnetic ring, 903. Outer pressure ring, 904. Inner ring inlay, 905. Thrust magnetic ring, 906. Inner pressure ring,

[0065] A. Liquid injection opening, B. Economizer steam supply opening. DETAILED DESCRIPTION

[0066] exist Figure 4 , 5In the embodiments of a magnetically suspended screw refrigeration (air conditioning) compressor shown in Figures , 6, 7 and 8, the compressor is formed into a whole by at least a body component 1, a driving rotor 2, a driven rotor 3, a magnetic coupling 7, a radial permanent magnetic bearing 8 and a bidirectional permanent magnetic axial thrust bearing 9.

[0067] The connecting body 101, the machine body 102, the exhaust end seat 103, the exhaust end cover 104, the end cover 105, and the muffler 111 are connected to form a machine body part by screws;

[0068] The driving rotor 2, the driving rotor suction end radial permanent magnetic bearing 201, the driving rotor suction end shaft sleeve 22, the driving rotor exhaust end shaft sleeve 23, the driving rotor exhaust end radial permanent magnetic bearing 202, the driving rotor exhaust end clearance adjustment ring 203, the driving rotor exhaust end bidirectional permanent magnetic axial thrust bearing 204, the driving rotor exhaust end bearing gland 27, the driving rotor exhaust end butterfly spring 28, and the driving rotor exhaust end locking nut 29 are assembled to form the driving rotor components;

[0069] The driven rotor 3, the driven rotor suction end radial permanent magnetic bearing 301, the driven rotor suction end shaft sleeve 32, the driven rotor exhaust end shaft sleeve 33, the driven rotor exhaust end radial permanent magnetic bearing 302, the driven rotor exhaust end clearance adjustment ring 303, the driven rotor exhaust end bidirectional permanent magnetic axial thrust bearing 304, the driven rotor exhaust end bearing gland 37, the driven rotor exhaust end butterfly spring 38, and the driven rotor exhaust end locking nut 39 are assembled to form the driven rotor component;

[0070] The driving coupling 701, the shielding cover 702, the outer rotating body 703, the outer magnetic shoe 704, the inner rotating body 705, and the inner magnetic shoe 706 are combined to form a magnetic coupling;

[0071] The outer ring body 801, the outer magnetic ring 802, the outer magnetic ring pressure ring 803, the inner ring body 804, the inner magnetic ring 805, and the inner magnetic ring pressure ring 806 are combined to form a radial permanent magnetic bearing;

[0072] The outer ring inlay 901, the static magnetic ring 902, the outer pressure ring 903, the inner ring inlay 904, the thrust magnetic ring 905 and the inner pressure ring 906 form a bidirectional permanent magnetic axial thrust bearing.

[0073] The machine body 102 is characterized in that: a liquid injection opening A or an economizer steam supplementation opening B is opened in the compression chamber of the machine body 102.

[0074] The magnetic coupling 7 is characterized in that: the driving coupling 701 is connected to the outer rotating body 703, the outer magnetic tile 704 is embedded in the outer rotating body 703, the inner rotating body 705 is connected to the driving rotor 2, the inner magnetic tile 706 is embedded in the inner rotating body 705, and the shielding cover 702 isolates the outer rotating body 703 and the inner rotating body 705 and is connected to the connecting body 101; the outer magnetic tile 704 and the inner magnetic tile 706 are arranged in an even number of pairs in the circumferential direction, are magnetized radially, and the magnetic lines of force of adjacent magnetic rows are in opposite directions.

[0075] The radial permanent magnetic bearing 8 is characterized in that: the outer ring body 801, the outer magnetic ring 802 and the outer magnetic ring pressure ring 803 are combined into one body, the inner ring body 804, the inner magnetic ring 805 and the inner magnetic ring pressure ring 806 are combined into one body, and can be installed separately in pairs; the outer magnetic ring 802 and the inner magnetic ring 805 are arranged in an even number of pairs in the axial direction, axially magnetized, and the magnetic properties of the connected magnetic rings repel each other, or radially magnetized, and the magnetic properties of the inner and outer magnetic rings repel each other.

[0076] The bidirectional permanent magnetic axial thrust bearing 9 is characterized in that: the static magnetic ring 902 is respectively embedded in the outer ring inlay 901 and the outer pressure ring 903, the thrust magnetic ring 905 is embedded between the inner ring inlay 904 and the inner pressure ring 906, and the thrust magnetic ring 905 is located between the two static magnetic rings 902; the magnetic forces between the thrust magnetic ring 905 and the static magnetic ring 902 repel each other.

[0077] The working process of the magnetic suspension screw refrigeration (air conditioning) compressor is as follows:

[0078] Under the action of an external driving force (such as a motor or a fuel engine), the driving coupling 701 drives the outer rotating body 703 to rotate, and the outer magnetic tile 704 embedded in the outer rotating body 703 drives the inner magnetic tile 706 embedded in the inner rotating body 705 through magnetic force, so that the inner rotating body 705 rotates synchronously. In this process, the outer magnetic tile 704 and the inner magnetic tile 706 are non-contact, and there is no friction power consumption.

[0079] The inner rotating body 705 is connected to the driving rotor 2. When the inner rotating body 705 is driven to rotate, the driving rotor 2 is also driven to rotate synchronously.

[0080] The driving rotor 2 and the driven rotor 3 are a pair of screw rotors with specific convex and concave tooth shapes that mesh with each other, and are both placed in the cavity of the body 102. As the driving rotor 2 rotates, the basic volume of the driving rotor 2 and the driven rotor 3 changes periodically from expansion to contraction, so that the refrigerant gas undergoes a suction, compression, and discharge process in the compressor cavity, and the state of the refrigerant gas changes: the temperature rises, the pressure rises, and the volume decreases. After the high-temperature and high-pressure refrigerant gas is discharged from the compressor, it enters the condenser, releases heat through heat exchange and condenses into liquid. The liquid enters the evaporator after pressure reduction and throttling, absorbs heat through heat exchange and evaporates into low-temperature and low-pressure refrigerant gas, and the state of the refrigerant gas changes again: the temperature decreases, the pressure decreases, and the volume increases. The refrigerant gas is sucked into the compressor again, thus completing the refrigeration cycle.

[0081] The liquid medium has the characteristics of large latent heat of vaporization and certain viscosity. Spraying a certain amount of refrigerant liquid into the compressor cavity can absorb compression heat, reduce the adiabatic index of the medium, make the compression process tend to be an isothermal process, reduce power consumption, and at the same time, absorb noise during the vaporization process of the medium. A liquid spray opening A is provided in the compression chamber of the machine body 102 to play a role in cooling and reducing noise. A certain amount of refrigerant liquid sprayed into the compressor cavity comes from a branch of the condenser in the refrigeration system, enters the compressor cavity through the liquid spray opening A, mixes with the refrigerant gas sucked by the compressor, absorbs heat and vaporizes, and is discharged together into the condenser to be cooled into liquid, thereby completing the liquid spray cycle.

[0082] The periodic change of the unit volume of the driving rotor 2 and the driven rotor 3 from expansion to contraction provides the possibility of re-steam replenishment, so that the screw compressor can achieve quasi-two-stage compression, i.e. economizer, which greatly improves the low-temperature performance of the compressor. The economizer steam replenishment opening B is opened for this purpose.

[0083] The magnetically suspended screw refrigeration (air conditioning) compressor of the present invention has advantages that are unattainable by the screw refrigeration (air conditioning) compressors in the prior art: it eliminates the friction power consumption of the rotating moving parts of the compressor, realizes oil-free lubrication operation, eliminates the defects of oil film thermal resistance and increased pressure drop caused by the filter, achieves comprehensive adaptability to refrigerants and zero leakage, simplifies the refrigeration cycle system, saves resources, and greatly improves the performance and reliability of the compressor.

[0084] Fig. 9 and Figure 7 The difference is: Fig. 9 The inner and outer magnetic rings are radially magnetized, and Figure 7 It is axial magnetization.

[0085] Fig.10 and Figure 8 The difference is: Fig.10 The thrust magnetic ring is composed of two identical magnetic rings repelling each other. Figure 8 It is a magnetic ring. Fig.10 and Figure 8 , the magnetism between the thrust magnetic ring and the static magnetic ring repels each other.

Claims

1. A magnetically suspended screw refrigeration compressor, comprising at least a body component (1), a driving rotor (2), a driven rotor (3), a magnetic coupling (7), a radial permanent magnetic bearing (8) and a bidirectional permanent magnetic axial thrust bearing (9) to form an integral body, characterized in that: The connecting body (101), the machine body (102), the exhaust end seat (103), the exhaust end cover (104), the end cover (105), and the muffler (111) are connected to form a machine body component by screws; The drive rotor (2), the drive rotor suction end radial permanent magnetic bearing (201), the drive rotor suction end shaft sleeve (22), the drive rotor exhaust end shaft sleeve (23), the drive rotor exhaust end radial permanent magnetic bearing (202), the drive rotor exhaust end clearance adjustment ring (203), the drive rotor exhaust end bidirectional permanent magnetic axial thrust bearing (204), the drive rotor exhaust end bearing pressure cover (27), the drive rotor exhaust end butterfly spring (28), and the drive rotor exhaust end locking nut (29) are assembled to form a drive rotor component; The driven rotor (3), a driven rotor suction end radial permanent magnetic bearing (301), a driven rotor suction end shaft sleeve (32), a driven rotor exhaust end shaft sleeve (33), a driven rotor exhaust end radial permanent magnetic bearing (302), a driven rotor exhaust end clearance adjustment ring (303), a driven rotor exhaust end bidirectional permanent magnetic axial thrust bearing (304), a driven rotor exhaust end bearing gland (37), a driven rotor exhaust end butterfly spring (38), and a driven rotor exhaust end locking nut (39) are assembled to form a driven rotor component; The driving coupling (701), the shielding cover (702), the outer rotating body (703), the outer magnetic tile (704), the inner rotating body (705), and the inner magnetic tile (706) are combined to form a magnetic coupling (7); The outer ring body (801), the outer magnetic ring (802), the outer magnetic ring pressure ring (803), the inner ring body (804), the inner magnetic ring (805), and the inner magnetic ring pressure ring (806) are combined to form a radial permanent magnetic bearing (8); The outer ring inlay (901), the static magnetic ring (902), the outer pressure ring (903), the inner ring inlay (904), the thrust magnetic ring (905), and the inner pressure ring (906) are combined to form a bidirectional permanent magnetic axial thrust bearing (9); The driving rotor exhaust end clearance adjustment ring (203) and the driven rotor exhaust end clearance adjustment ring (303) are both in contact with one end of the outer ring inlay (901) and the inner ring inlay (904); the driving rotor exhaust end locking nut (29) and the driven rotor exhaust end locking nut (39) are both in contact with the other end of the inner ring inlay (904); and the driving rotor exhaust end bearing pressure cover (27) and the driven rotor exhaust end bearing pressure cover (37) are both in contact with the other end of the outer ring inlay (901); A liquid injection opening (A) or an economizer steam supplement opening (B) is provided in the compression chamber of the machine body (102); The driving coupling (701) is connected to the outer rotating body (703), the outer magnetic tile (704) is embedded in the outer rotating body (703), the inner rotating body (705) is connected to the driving rotor (2), the inner magnetic tile (706) is embedded in the inner rotating body (705), and the shielding cover (702) isolates the outer rotating body (703) and the inner rotating body (705) and is connected to the connecting body (101); the outer magnetic tile (704) and the inner magnetic tile (706) are arranged in an even number of pairs in the circumferential direction, are magnetized in the radial direction, and the magnetic lines of force of adjacent magnetic rows are in opposite directions; The outer ring body (801), the outer magnetic ring (802) and the outer magnetic ring pressing ring (803) are combined into one body, and the inner ring body (804), the inner magnetic ring (805) and the inner magnetic ring pressing ring (806) are combined into one body, and can be installed separately in pairs; the outer magnetic ring (802) and the inner magnetic ring (805) are arranged in an even number of pairs in the axial direction, and are magnetized in the axial direction, and the magnetic properties of the connected magnetic rings repel each other, or are magnetized in the radial direction, and the magnetic properties of the inner and outer magnetic rings repel each other; The static magnetic ring (902) is respectively inlaid on the outer ring inlay (901) and the outer pressure ring (903), and the thrust magnetic ring (905) is inlaid between the inner ring inlay (904) and the inner pressure ring (906). The thrust magnetic ring (905) is located between the two static magnetic rings (902); the thrust magnetic ring (905) and the static magnetic ring (902) are magnetically repelled from each other.

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