A structure of an oil-free refrigeration compressor with integrated magnetic levitation bearing

Abstract

This utility model relates to the field of refrigeration compressors and discloses an oil-free refrigeration compressor structure with integrated magnetic levitation bearings. It includes a permanent magnet motor, a rotor fixedly mounted on the left end of the permanent magnet motor, a drive shaft fixedly mounted on the inner wall of the rotor, an auxiliary component at the right end of the drive shaft, and a magnetic levitation assembly on the outer wall of the drive shaft near the left side of the rotor. A housing is detachably connected to the outer wall of the permanent magnet motor. The magnetic levitation assembly includes a radial magnetic levitation bearing, with multiple sets of magnetic plates fixedly connected to the outer surface of the radial magnetic levitation bearing. The outer surface of the magnetic plates has radial patterns. In this utility model, through the cooperation of components such as the radial magnetic levitation bearing, the fixed ring, and the thrust magnetic levitation bearing, the drive shaft achieves contactless levitation, eliminating mechanical friction and significantly improving the compressor's operational stability and service life. Simultaneously, it eliminates the need for lubricating oil, ensuring the purity of the refrigerant.

Description

Technical Field

[0001] This utility model relates to the field of refrigeration compressors, and in particular to a structure of an oil-free refrigeration compressor with an integrated magnetic levitation bearing. Background Technology

[0002] In the fields of refrigeration and air conditioning, cold chain logistics, and industrial refrigeration, the refrigeration compressor, as a core power component, directly determines the system performance through its operating efficiency, reliability, and the purity of the working fluid. Currently, most mainstream refrigeration compressors adopt structures such as rolling rotors and scroll compressors, which generally rely on mechanical bearings for rotor support.

[0003] The above-mentioned device has the following drawbacks: existing mechanical bearings inevitably experience mechanical friction during operation, which not only causes energy loss and reduces compressor efficiency, but also requires regular lubrication to reduce wear. The lubricating oil is easy to mix into the refrigerant, which will contaminate the refrigerant and affect heat exchange efficiency. In addition, an oil separation device is required, which increases the system complexity and cost. Therefore, an oil-free refrigeration compressor structure with integrated magnetic levitation bearing is proposed to solve the above problems. Utility Model Content

[0004] To overcome the above shortcomings, this utility model provides an oil-free refrigeration compressor structure with integrated magnetic levitation bearing, which aims to improve the problem of high mechanical friction loss caused by the reliance on mechanical bearings in traditional refrigeration compressors in the prior art.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: an oil-free refrigeration compressor structure with integrated magnetic levitation bearing, comprising a permanent magnet motor, a rotor fixedly mounted on the left end of the permanent magnet motor, a drive shaft fixedly mounted on the inner wall of the rotor, an auxiliary component provided on the right end of the drive shaft, a magnetic levitation component provided on the outer wall of the drive shaft near the left side of the rotor, a housing detachably connected to the outer wall of the permanent magnet motor, the magnetic levitation component comprising a radial magnetic levitation bearing, multiple sets of magnetic sheets fixedly connected to the outer surface of the radial magnetic levitation bearing, radial textures formed on the outer surface of the magnetic sheets, a fixing ring provided on the outer wall of the drive shaft near the right side of the radial magnetic levitation bearing, a position sensor fixedly mounted on the left surface of the fixing ring, a thrust magnetic levitation bearing fixedly mounted on the outer wall of the drive shaft near the right side of the fixing ring, and a magnetic ring fixedly mounted on the left surface of the thrust magnetic levitation bearing.

[0006] As a further description of the above technical solution: the auxiliary component includes an auxiliary seat, the right end of which is fixedly connected to a first impeller, and the right surface of the first impeller is fixedly connected to multiple sets of transmission rods.

[0007] As a further description of the above technical solution: a second impeller is detachably connected to the left end of the drive shaft.

[0008] As a further description of the above technical solution: multiple sets of evenly distributed drive teeth are provided on the outer wall of the second impeller.

[0009] As a further description of the above technical solution: the inner wall of the housing is provided with an installation groove adapted to the permanent magnet motor, and both ends of the housing are provided with sealing end caps, and the center of the sealing end cap is provided with a through hole for the drive shaft to pass through.

[0010] As a further description of the above technical solution: the magnetic sheet is made of neodymium iron boron permanent magnet material, and multiple sets of magnetic sheets are distributed in a ring array on the outer surface of the radial magnetic levitation bearing.

[0011] As a further description of the above technical solution: the radial magnetic levitation bearing is fixedly installed on the outer wall of the drive shaft.

[0012] As a further description of the above technical solution: the auxiliary seat is fixedly installed on the right surface of the thrust magnetic levitation bearing.

[0013] This utility model has the following beneficial effects:

[0014] 1. In this utility model, the radial magnetic levitation bearing, fixed ring, thrust magnetic levitation bearing and other components in the equipment cooperate with each other through the connection relationship to achieve non-contact levitation of the drive shaft, eliminate mechanical friction, greatly improve the operating stability and service life of the compressor, and at the same time, no lubricating oil is required, ensuring the purity of the refrigerant.

[0015] 2. In this utility model, the drive rod, the first impeller, the transmission rod and other components in the equipment cooperate with each other through the connection relationship. The design of the double impeller and the transmission rod enables the refrigerant to undergo two-stage compression, which improves the compression efficiency and pressure. The transmission rod also enhances the rigidity of the impeller, helping the compressor to complete the refrigeration fluid transportation efficiently and stably. Attached Figure Description

[0016] Figure 1 This is a partial cross-sectional view of the main body of an oil-free refrigeration compressor structure with integrated magnetic levitation bearing proposed in this utility model.

[0017] Figure 2 This is a front view of the main body of an oil-free refrigeration compressor structure with integrated magnetic levitation bearing proposed in this utility model.

[0018] Figure 3 This is an exploded view of a partial area of ​​the auxiliary components of an oil-free refrigeration compressor structure with integrated magnetic levitation bearing proposed in this utility model.

[0019] Figure 4This is a partial schematic diagram of the magnetic levitation component of an oil-free refrigeration compressor structure with integrated magnetic levitation bearings proposed in this utility model.

[0020] Legend:

[0021] 1. Housing; 2. Permanent magnet motor; 3. Rotor; 4. Magnetic suspension assembly; 41. Radial magnetic suspension bearing; 42. Magnetic sheet; 43. Radial texture; 44. Fixing ring; 45. Position sensor; 46. Thrust magnetic suspension bearing; 47. Magnetic ring; 5. Auxiliary assembly; 51. Auxiliary seat; 52. First impeller; 53. Transmission rod; 6. Second impeller; 7. Drive shaft. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0023] Reference Figure 1 - Figure 2 This utility model provides an embodiment of an oil-free refrigeration compressor structure with integrated magnetic levitation bearings, including a permanent magnet motor 2. The permanent magnet motor 2 serves as the power source for the compressor, generating a rotating magnetic field through electromagnetic induction to drive the rotor 3 to rotate, thereby driving the drive shaft 7 and related components to operate, providing power output for the entire compressor. The rotor 3 is fixedly installed on the left end of the permanent magnet motor 2. The rotor 3 cooperates with the permanent magnet motor 2 and rotates under the force generated by the motor. The drive shaft 7 is fixed on its inner wall, transmitting its own rotational motion to the drive shaft 7 to realize power transmission. The drive shaft 7 is fixedly installed on the inner wall of the rotor 3. An auxiliary component 5 is provided on the right end of the drive shaft 7. The outer wall of the drive shaft 7 is close to... A magnetic suspension assembly 4 is provided on the left side of the rotor 3. The magnetic suspension assembly 4 is an integral part that realizes non-contact suspension support for the drive shaft 7, reducing mechanical friction and improving operational stability and service life. The outer wall of the permanent magnet motor 2 is detachably connected to the housing 1. The housing 1 serves as the external protection and support structure of the compressor. The mounting groove on its inner wall is used to fix the permanent magnet motor 2. The sealing end caps at both ends achieve sealing protection for the internal components. The through hole in the center of the end cap provides rotation space for the drive shaft 7 and ensures a sealed environment inside the compressor. The inner wall of the housing 1 is provided with a mounting groove that matches the permanent magnet motor 2, and both ends of the housing 1 are provided with sealing end caps. The center of the sealing end cap is provided with a through hole for the drive shaft 7 to pass through.

[0024] Reference Figure 2 - Figure 4The magnetic levitation assembly 4 includes a radial magnetic levitation bearing 41, which is fixedly mounted on the outer wall of the drive shaft 7. The radial magnetic levitation bearing 41 levitates and supports the drive shaft 7 in the radial direction through the magnetic force of other magnetic components, limiting the radial displacement of the drive shaft 7. Multiple sets of magnetic sheets 42 are fixedly connected to the outer surface of the radial magnetic levitation bearing 41. The magnetic sheets 42 are made of neodymium iron boron permanent magnet material. The magnetic sheets 42 generate magnetic force through their own magnetism and in conjunction with other magnetic structures, providing a magnetic foundation for the radial levitation of the radial magnetic levitation bearing 41. The annular array distribution ensures uniform radial force, and the multiple sets of magnetic sheets 42 are arranged in an annular array on the outer surface of the radial magnetic levitation bearing 41. Radial grooves 43 are formed on the outer surface of the magnetic sheets 42. The radial grooves 43 optimize the magnetic field distribution of the magnetic sheets 42, enhance the stability of the magnetic force, and may also help reduce magnetic interference. The outer wall of the drive shaft 7 is close to the radial magnetic levitation bearing 41. A fixing ring 44 is provided on the right side of the drive shaft 7. The fixing ring 44 provides a mounting base for the position sensor 45 and also plays a certain role in limiting the surrounding components. The position sensor 45 is fixedly installed on the left surface of the fixing ring 44. The position sensor 45 is used to detect the position offset of the drive shaft 7 in real time and feed the position information back to the control system so as to adjust the magnetic force of the magnetic levitation bearing in time to ensure the stable levitation of the drive shaft 7. A thrust magnetic levitation bearing 46 is fixedly installed on the right side of the outer wall of the drive shaft 7 near the fixing ring 44. The thrust magnetic levitation bearing 46 levitates and supports the drive shaft 7 in the axial direction through the magnetic force of the magnetic ring 47 and other components, limiting the axial displacement of the drive shaft 7. A magnetic ring 47 is fixedly installed on the left surface of the thrust magnetic levitation bearing 46. The magnetic ring 47, together with the thrust magnetic levitation bearing 46 and other related magnetic components, generates axial magnetic force, providing a magnetic force basis for the axial levitation of the thrust magnetic levitation bearing 46.

[0025] Reference Figure 2 - Figure 4The auxiliary component 5 assists the compressor in performing functions such as fluid transport related to refrigeration. The auxiliary component 5 includes an auxiliary seat 51, which provides mounting and fixing support for the first impeller 52, enabling linkage between the first impeller 52 and components such as the drive shaft 7. The auxiliary seat 51 is fixedly mounted on the right surface of the thrust magnetic levitation bearing 46. The first impeller 52 is fixedly connected to the right end of the auxiliary seat 51. When the first impeller 52 rotates with the drive shaft 7, it generates suction and compression on fluids such as refrigerant, participating in fluid transport during the refrigeration cycle. Multiple sets of transmission rods 53 are fixedly connected to the right surface of the first impeller 52. The surface can enhance the structural strength of the first impeller 52, or assist in power transmission and linkage with other components in a specific structure. The left end of the drive shaft 7 is detachably connected to the second impeller 6. As the core component for power transmission, the drive shaft 7 connects the rotor 3, the magnetic suspension assembly 4, the auxiliary assembly 5 and the second impeller 6, transmitting the rotational motion of the permanent magnet motor 2 and the rotor 3 to each component, driving them to work together. The outer wall of the second impeller 6 is provided with multiple sets of evenly distributed drive teeth. The second impeller 6 can process the fluid in cooperation with the first impeller 52 or alone. The drive teeth on its outer wall can enhance the interaction with the fluid and improve the fluid transport or compression efficiency.

[0026] Working principle:

[0027] When the stator of the permanent magnet motor 2 is energized, it generates a rotating magnetic field, which interacts with the permanent magnets fixed on the rotor 3, driving the rotor 3 to rotate at high speed. The rotor 3 is connected to the drive shaft 7 by an interference fit or spline, so the drive shaft 7 obtains an angular velocity synchronized with the rotor 3. The left end of the drive shaft 7 is detachably connected to the second impeller 6, and the right end is connected to the first impeller 52 through an auxiliary seat 51, thereby transmitting power to the first and second stage impellers simultaneously, realizing two-stage series compression.

[0028] A radial magnetic levitation bearing 41 is interference-fitted onto the outer wall of the drive shaft 7, with multiple sets of magnetic plates 42 arranged in a ring array around its outer periphery. The magnetic plates 42 are neodymium iron boron permanent magnets, with radial grooves 43 on their surfaces to optimize the magnetic field distribution. An electromagnetic coil (not shown) with complementary polarity to the magnetic plates 42 is located on the inner wall of the housing 1, within the housing mounting slot. When the coil is energized, it generates a controllable radial magnetic force with the magnetic plates 42, keeping the radial displacement of the drive shaft 7 close to zero. A position sensor 45 mounted on the left surface of the fixing ring 44 detects the radial offset of the drive shaft 7 in real time and feeds it back to the controller. The controller adjusts the coil current, maintaining radial levitation in a closed loop. The thrust magnetic levitation bearing 46 is fixed to the outer wall of the drive shaft 7 and adjacent to the radial magnetic levitation bearing 41. A magnetic ring 47 is mounted on its left surface. The magnetic ring 47 interacts with an axial electromagnet (not shown) inside the end cover of the housing 1, generating an adjustable axial force to counteract the aerodynamic thrust of the impeller and the gravitational component, achieving zero axial displacement. The magnitude of the axial force is also adjusted in real time by the closed-loop system formed by the position sensor 45 and the controller.

[0029] The refrigerant enters through the intake port of the casing 1, where it is first accelerated and initially compressed by the drive teeth on the outer wall of the second impeller 6. It then enters the annular flow channel between the permanent magnet motor 2 and the casing 1, also serving as a cooling mechanism for the motor. The refrigerant continues to flow to the right, undergoes secondary pressurization by the first impeller 52, and is then discharged through the exhaust port of the casing 1. Both stages of compression are driven at the same speed by the same drive shaft 7, ensuring that the compression ratio and flow rate are matched. The transmission rods 53 are arranged radially on the right surface of the first impeller 52, improving impeller rigidity and balancing local stresses.

[0030] Sealed end caps are installed at both ends of the housing 1. The central through hole of the end cap maintains a 0.5-1mm non-contact gap with the drive shaft 7, forming a labyrinth seal. Combined with the zero-friction characteristics of magnetic levitation, this ensures that there is no oil inside the cavity and no external leakage. The mounting groove on the inner wall of the housing 1 and the outer wall of the permanent magnet motor 2 form a secondary seal through an O-ring or metal gasket, which meets the requirements for long-term operation of high-pressure refrigerant. When the system loses power or the control fails, the magnetic levitation force disappears instantly, and the drive shaft 7 falls under the action of gravity and aerodynamic thrust. It is temporarily supported by the mechanical protection bearing (not shown) on the inner side of the end cap of the housing 1, which prevents the rotor 3 from colliding with the stator or the impeller with the housing, thus achieving a safe shutdown.

[0031] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A structure for an oil-free refrigeration compressor with integrated magnetic levitation bearing, comprising a permanent magnet motor (2), characterized in that: The permanent magnet motor (2) has a rotor (3) fixedly installed on its left end. A drive shaft (7) is fixedly installed on the inner wall of the rotor (3). An auxiliary component (5) is provided on the right end of the drive shaft (7). A magnetic suspension component (4) is provided on the outer wall of the drive shaft (7) near the left side of the rotor (3). The outer wall of the permanent magnet motor (2) is detachably connected to a housing (1). The magnetic suspension assembly (4) includes a radial magnetic suspension bearing (41). Multiple sets of magnetic sheets (42) are fixedly connected to the outer surface of the radial magnetic suspension bearing (41). Radial textures (43) are formed on the outer surface of the magnetic sheets (42). A fixing ring (44) is provided on the outer wall of the drive shaft (7) near the right side of the radial magnetic suspension bearing (41). A position sensor (45) is fixedly installed on the left surface of the fixing ring (44). A thrust magnetic suspension bearing (46) is fixedly installed on the outer wall of the drive shaft (7) near the right side of the fixing ring (44). A magnetic ring (47) is fixedly installed on the left surface of the thrust magnetic suspension bearing (46).

2. The structure of an oil-free refrigeration compressor with an integrated magnetic levitation bearing according to claim 1, characterized in that: The auxiliary component (5) includes an auxiliary seat (51), and a first impeller (52) is fixedly connected to the right end of the auxiliary seat (51). Multiple sets of transmission rods (53) are fixedly connected to the right surface of the first impeller (52).

3. The structure of an oil-free refrigeration compressor with an integrated magnetic levitation bearing according to claim 1, characterized in that: The left end of the drive shaft (7) is detachably connected to a second impeller (6).

4. The structure of an oil-free refrigeration compressor with an integrated magnetic levitation bearing according to claim 3, characterized in that: The outer wall of the second impeller (6) is provided with multiple sets of evenly distributed drive teeth.

5. The structure of an oil-free refrigeration compressor with an integrated magnetic levitation bearing according to claim 1, characterized in that: The inner wall of the housing (1) is provided with an installation groove that is compatible with the permanent magnet motor (2), and both ends of the housing (1) are provided with sealing end caps. A through hole for the drive shaft (7) to pass through is provided at the center of the sealing end cap.

6. The structure of an oil-free refrigeration compressor with an integrated magnetic levitation bearing according to claim 1, characterized in that: The magnetic sheet (42) is made of neodymium iron boron permanent magnet material, and multiple sets of magnetic sheets (42) are distributed in a ring array on the outer surface of the radial magnetic levitation bearing (41).

7. The structure of an oil-free refrigeration compressor with an integrated magnetic levitation bearing according to claim 1, characterized in that: The radial magnetic levitation bearing (41) is fixedly installed on the outer wall of the drive shaft (7).

8. The structure of an oil-free refrigeration compressor with an integrated magnetic levitation bearing according to claim 2, characterized in that: The auxiliary seat (51) is fixedly installed on the right surface of the thrust magnetic levitation bearing (46).

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