Compressor components and compressors

Abstract

The present invention discloses a compressor assembly and a compressor, the compressor assembly includes a hydrodynamic bearing, an electromagnetic bearing and a rotor, the rotor is rotatably inserted in the hydrodynamic bearing and the electromagnetic bearing, and the hydrodynamic bearing and the electromagnetic bearing are arranged side by side along the axial direction of the rotor, and the electromagnetic bearing is arranged to drive the rotor to suspend relative to the hydrodynamic bearing when powered on. When in use, when the compressor is started, the electromagnetic bearing is powered on to generate a magnetic field, and the rotor is driven to suspend relative to the hydrodynamic bearing under the action of the magnetic field. When the compressor is turned off, the electromagnetic bearing is still powered on to generate a magnetic field, and the rotor is driven to suspend relative to the hydrodynamic bearing under the action of the magnetic field. Furthermore, when the speed of the rotor is reduced, dry friction with the hydrodynamic bearing will not occur to cause wear on the hydrodynamic bearing, so that the service life of the hydrodynamic bearing can be improved.

Description

Technical Field

[0001] The present invention relates to the technical field of compressors, and in particular to a compressor assembly and a compressor. Background Art

[0002] Centrifugal refrigeration compressors are high-speed compressors. The compressor rotor rotates at high speed during operation, and reliable bearings are needed to support the rotor. At present, environmentally friendly oil-free hydrodynamic bearings are mainly used to support the rotor.

[0003] However, when the traditional hydrodynamic bearing is in use, especially when the compressor is started and shut down, the rotor speed is low, and friction occurs between the rotor and the hydrodynamic bearing, causing the hydrodynamic bearing to wear, thereby affecting the normal use of the compressor. Summary of the invention

[0004] Based on this, in order to address the problem that traditional hydrodynamic bearings are prone to wear during use, thereby affecting the normal use of the compressor, a compressor assembly and a compressor are proposed. The compressor assembly and the compressor can reduce the wear of the hydrodynamic bearing during use, thereby increasing the service life of the hydrodynamic bearing.

[0005] The specific technical solutions are as follows:

[0006] On the one hand, the present application relates to a compressor assembly, including a hydrodynamic bearing, an electromagnetic bearing and a rotor, wherein the rotor is rotatably inserted in the hydrodynamic bearing and the electromagnetic bearing, and the hydrodynamic bearing and the electromagnetic bearing are arranged side by side along the axial direction of the rotor, and the electromagnetic bearing is configured to drive the rotor to be suspended relative to the hydrodynamic bearing when energized.

[0007] When the above-mentioned compressor assembly is in use, when the compressor is started, the electromagnetic bearing is energized to generate a magnetic field, and under the action of the magnetic field, the rotor is driven to suspend relative to the hydrodynamic bearing. As a result, the rotor will not have dry friction with the hydrodynamic bearing when rotating, causing wear on the hydrodynamic bearing; then, the rotor performs high-speed rotation, continuously bringing gas with a certain viscosity into the gap between the rotor and the hydrodynamic bearing. As the gas continues to enter, the air film generated between the rotor and the hydrodynamic bearing has a certain air film force. When the air film force is sufficient to balance the rotor load, the rotor is completely separated from the hydrodynamic bearing. At this time, the hydrodynamic bearing uses the air film force to support the normal operation of the rotor. When the compressor is started, the electromagnetic bearing is energized to generate a magnetic field, and under the action of the magnetic field, the rotor is driven to suspend relative to the hydrodynamic bearing. When the compressor is turned off, the electromagnetic bearing is still energized to generate a magnetic field, and under the action of the magnetic field, the rotor is driven to suspend relative to the hydrodynamic bearing. As a result, when the speed is reduced, the rotor will still not have dry friction with the hydrodynamic bearing, causing wear on the hydrodynamic bearing. In this way, the service life of the hydrodynamic bearing can be improved.

[0008] The technical solution is further described below:

[0009] In one embodiment, the electromagnetic bearing includes a mounting bracket and a coil, the mounting bracket is provided with a first mounting hole, the rotor is rotatably inserted into the first mounting hole, the coil is arranged on the mounting bracket, and the coil is configured such that the resultant magnetic force generated when energized can overcome the gravity of the rotor and cause the rotor to suspend in the first mounting hole.

[0010] In one embodiment, the mounting bracket includes a first mounting body, a connecting body and a second mounting body, the first mounting body is provided with the first mounting hole, the second mounting body is provided with the second mounting hole, the first mounting body is arranged in the second mounting hole, the first mounting body is connected to the inner wall of the second mounting hole through the connecting body, and the coil is wound around the connecting body.

[0011] In one embodiment, the compressor assembly also includes a pressure sensor and a controller, wherein the pressure sensor is used to detect the pressure on the inner wall of the first mounting hole, and the electromagnetic bearing also includes a power supply, which is used to supply current to the coil. The pressure sensor and the power supply are both communicatively connected to the controller, and the controller controls the power supply to adjust the current supplied to the coil according to the pressure detected by the pressure sensor.

[0012] In one embodiment, the number of the connecting bodies and the number of the coils are both multiple, and the connecting bodies correspond to the coils one by one, the connecting bodies are arranged on the outer wall of the first mounting body at intervals along the circumference of the first mounting body, and the horizontal plane where the axis of the rotor is located is used as the boundary surface, and the number of turns of the coil located above the boundary surface is greater than the number of turns of the coil located below the boundary surface.

[0013] In one embodiment, the number of the connecting bodies and the number of the coils are both multiple, and the connecting bodies correspond to the coils one by one. The connecting bodies are arranged on the outer wall of the first mounting body at intervals along the circumference of the first mounting body, and the horizontal plane where the axis of the rotor is located is used as the boundary plane, and the coils are arranged above the boundary plane.

[0014] In one embodiment, the compressor assembly further includes a non-magnetic conductive component, which is fixed to the first mounting body and disposed between two adjacent coils.

[0015] In one embodiment, a gap formed between the rotor and the hydrodynamic bearing is larger than a gap formed between the rotor and the electromagnetic bearing.

[0016] In one embodiment, the compressor assembly further includes a bearing seat, and the hydrodynamic bearing and the electromagnetic bearing are both fixedly mounted on the bearing seat.

[0017] In one embodiment, the number of the electromagnetic bearings is two, the number of the hydrodynamic bearings is two, the hydrodynamic bearings and the electromagnetic bearings are arranged side by side, and the electromagnetic bearings are each arranged between the two hydrodynamic bearings.

[0018] On the other hand, the present application also relates to a compressor, comprising the compressor assembly in any of the above embodiments.

[0019] When the above-mentioned compressor is in use, when the compressor is started, the electromagnetic bearing is energized to generate a magnetic field, and under the action of the magnetic field, the rotor is driven to suspend relative to the hydrodynamic bearing. As a result, the rotor will not have dry friction with the hydrodynamic bearing when rotating, causing wear on the hydrodynamic bearing; then, the rotor performs high-speed rotation, continuously bringing gas with a certain viscosity into the gap between the rotor and the hydrodynamic bearing. As the gas continues to enter, the air film generated between the rotor and the hydrodynamic bearing has a certain air film force. When the air film force is sufficient to balance the rotor load, the rotor is completely separated from the hydrodynamic bearing. At this time, the hydrodynamic bearing uses the air film force to support the normal operation of the rotor. When the compressor is started, the electromagnetic bearing is energized to generate a magnetic field, and under the action of the magnetic field, the rotor is driven to suspend relative to the hydrodynamic bearing. When the compressor is turned off, the electromagnetic bearing is still energized to generate a magnetic field, and under the action of the magnetic field, the rotor is driven to suspend relative to the hydrodynamic bearing. As a result, when the speed is reduced, the rotor will still not have dry friction with the hydrodynamic bearing, causing wear on the hydrodynamic bearing. In this way, the service life of the hydrodynamic bearing can be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The drawings constituting a part of this application are used to provide a further understanding of the present invention. The schematic embodiments of the present invention and the description thereof are used to explain the present invention and do not constitute an improper limitation on the present invention.

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings used in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0022] In addition, the drawings are not drawn to a 1:1 scale, and the relative sizes of various elements are drawn only as examples in the drawings and are not necessarily drawn according to the true scale.

[0023] Figure 1 is a schematic structural diagram of a compressor assembly in one embodiment;

[0024] Figure 2is a schematic structural diagram of an electromagnetic bearing in one embodiment;

[0025] Figure 3 Schematic diagram of the structure of an electromagnetic bearing in another embodiment.

[0026] Description of reference numerals:

[0027] 10. Compressor assembly; 100. Hydrodynamic bearing; 200. Electromagnetic bearing; 210. Mounting bracket; 212. First mounting body; 2122. First mounting hole; 214. Second mounting body; 2142. Second mounting hole; 216. Connecting body; 220. Coil; 230. Non-magnetic component; 300. Rotor; 400. Bearing seat; 500. Pressure sensor; 600. Boundary surface. DETAILED DESCRIPTION

[0028] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present invention, so the present invention is not limited by the specific embodiments disclosed below.

[0029] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0030] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0031] The hydrodynamic bearings currently used in engineering mainly use gas as the lubricating medium. During startup, the rotor speed is low, resulting in insufficient air pressure between the rotor and the hydrodynamic bearing, causing the air pressure to be unable to support the rotor, which in turn causes dry friction between the hydrodynamic bearing and the rotor. Based on this, the present application proposes a compressor assembly 10, which can reduce the wear of the hydrodynamic bearing 100 during use, thereby increasing the service life of the hydrodynamic bearing 100.

[0032] Please refer to Figure 1 The compressor assembly 10 in one embodiment includes a hydrodynamic bearing 100, an electromagnetic bearing 200 and a rotor 300. The rotor 300 is rotatably inserted in the hydrodynamic bearing 100 and the electromagnetic bearing 200, and the hydrodynamic bearing 100 and the electromagnetic bearing 200 are arranged side by side along the axial direction of the rotor 300. The hydrodynamic bearing 100 is closer to the end of the rotor 300 than the electromagnetic bearing 200. There is a certain gap between the rotor 300 and the hydrodynamic bearing 100. Similarly, there is a certain gap between the rotor 300 and the electromagnetic bearing 200. The rotor 300 can be made of a material that can be attracted by magnetic poles, such as iron.

[0033] For further information, please refer to Figure 1 The compressor assembly 10 further includes a bearing seat 400, and the hydrodynamic bearing 100 and the electromagnetic bearing 200 are both fixedly mounted on the bearing seat 400. Figure 1 There are two electromagnetic bearings 200 and two hydrodynamic bearings 100 . The hydrodynamic bearings 100 and the electromagnetic bearings 200 are arranged side by side, and each electromagnetic bearing 200 is arranged between the two hydrodynamic bearings 100 .

[0034] Furthermore, the electromagnetic bearing 200 is configured to drive the rotor 300 to suspend relative to the hydrodynamic bearing 100 when powered on. At this time, the rotor 300 suspends relative to the hydrodynamic bearing 100, which means that no rotational friction or dry friction occurs between the rotor 300 and the hydrodynamic bearing 100. The electromagnetic bearing 200 can be powered on by an external power supply to supply power to the internal coil 220 of the electromagnetic bearing 200 so that the coil 220 generates a magnetic field, or by an internal power supply of the electromagnetic bearing 200 to supply power to the internal coil 220 of the electromagnetic bearing 200 so that the coil 220 generates a magnetic field.

[0035] Please refer to Figure 1When the compressor is started, the electromagnetic bearing 200 is energized to generate a magnetic field, and under the action of the magnetic field, the rotor 300 is driven to suspend relative to the hydrodynamic bearing 100. As a result, the rotor 300 will not cause dry friction with the hydrodynamic bearing 100 to cause wear on the hydrodynamic bearing 100 when rotating; then, the rotor 300 rotates at a high speed, continuously bringing gas with a certain viscosity into the gap between the rotor 300 and the hydrodynamic bearing 100. As the gas continues to enter, the air film generated between the rotor 300 and the hydrodynamic bearing 100 has a certain air film force. When the air film force is sufficient to balance the load of the rotor 300, the rotor 300 and the hydrodynamic bearing 100 are The hydrodynamic bearing 100 is completely separated. At this time, the hydrodynamic bearing 100 uses the air film force to support the normal operation of the rotor 300. When the compressor is started, the electromagnetic bearing 200 is energized to generate a magnetic field, and the rotor 300 is driven to suspend relative to the hydrodynamic bearing 100 under the action of the magnetic field. When the compressor is turned off, the electromagnetic bearing 200 is still energized to generate a magnetic field, and the rotor 300 is driven to suspend relative to the hydrodynamic bearing 100 under the action of the magnetic field. Furthermore, when the speed of the rotor 300 is reduced, dry friction with the hydrodynamic bearing 100 will not occur to cause wear to the hydrodynamic bearing 100. In this way, the service life of the hydrodynamic bearing 100 can be improved.

[0036] Furthermore, the gap formed between the rotor 300 and the hydrodynamic bearing 100 is larger than the gap formed between the rotor 300 and the electromagnetic bearing 200. In this way, when the rotor 300 is in use, when the compressor is started and shut down, the rotor 300 will not generate dry friction with the hydrodynamic bearing 100, thereby avoiding wear of the hydrodynamic bearing 100.

[0037] For details, please refer to Figure 2 and Figure 3 In this embodiment, the electromagnetic bearing 200 is provided with a mounting bracket 210 and a coil 220. The mounting bracket 210 is provided with a first mounting hole 2122. The rotor 300 is rotatably inserted into the first mounting hole 2122. The coil 220 is arranged on the mounting bracket 210. When in use, the coil 220 generates a magnetic field by energizing the coil 220. The resultant magnetic force generated when the coil 220 is energized can overcome the gravity of the rotor 300 and make the rotor 300 suspended in the first mounting hole 2122. Therefore, the rotor 300 will not generate dry friction with the hydrodynamic bearing 100 when rotating at a low speed, and will not cause certain wear to the hydrodynamic bearing 100.

[0038] For details, please refer to Figure 2 and Figure 3The mounting bracket 210 is provided with a first mounting body 212, a connecting body 216 and a second mounting body 214. The first mounting body 212 is provided with a first mounting hole 2122, the second mounting body 214 is provided with a second mounting hole 2142, the first mounting body 212 is arranged in the second mounting hole 2142, and the first mounting body 212 is connected to the inner wall of the second mounting hole 2142 through the connecting body 216, and the coil 220 is wound around the connecting body 216. Specifically, the first mounting body 212 and the second mounting body 214 are cylindrical, the first mounting body 212 is provided with the first mounting hole 2122, and the second mounting body 214 is provided with the second mounting hole 2142.

[0039] For further information, please refer to Figure 2 The number of the connecting bodies 216 and the number of the coils 220 are both multiple, and the connecting bodies 216 correspond to the coils 220 one by one. The connecting bodies 216 are arranged on the outer wall of the first mounting body 212 at intervals along the circumference of the first mounting body 212. In this way, the magnetic field generated by the coils 220 when powered is distributed along the circumference of the first mounting body 212. Please refer to Figure 2 The compressor assembly 10 further includes a non-magnetic conductive member 230, which is fixed to the first mounting body 212 and disposed between two adjacent coils 220. In this way, by providing the non-magnetic conductive member 230, the magnetic resistance is increased to prevent the magnetic lines of force from flowing inside the first mounting body 212, so that more magnetic field lines pass through the rotor 300. Referring to the figure, the first mounting body 212 is provided with a mounting groove, and the non-magnetic conductive member 230 is disposed in the mounting groove. Optionally, the non-magnetic conductive member 230 can be a filler made of copper, aluminum, zinc or other materials.

[0040] For further information, please refer to Figure 3 , taking the horizontal plane where the axis of the rotor 300 is located as the boundary surface 600, the number of turns of the coil 220 located above the boundary surface 600 is greater than the number of turns of the coil 220 located below the boundary surface 600. At this time, the magnetic force of the magnetic field generated by the coil 220 located above the boundary surface 600 is greater than the magnetic force of the magnetic field generated by the coil 220 located below the boundary surface 600. At this time, by reasonably setting the number of turns of the coil 220, the magnetic force generated by the coil 220 located above the boundary surface 600 can overcome the combined force of the magnetic force of the magnetic field generated by the coil 220 located below the boundary surface 600 and the gravity of the rotor 300, thereby making the rotor 300 stably suspended.

[0041] The horizontal plane where the axis of the rotor 300 is located is the boundary surface 600. Being located above the boundary surface 600 means being located above the boundary surface 600 when the rotor 300 is placed horizontally; being located below the boundary surface 600 means being located below the boundary surface 600 when the rotor 300 is placed horizontally. The purpose of limiting the number of turns of the coil 220 located above the boundary surface 600 to be greater than the number of turns of the coil 220 located below the boundary surface 600 is to ensure that the rotor 300 is always in a suspended state. Considering the thickness of the coil 220, when the coil 220 is exactly located at the boundary surface 600 and protrudes above and below the boundary surface 600, it can be considered that the coil 220 is set at the boundary surface 600, for example Figure 2 In the figure, two coils 220 are located on the boundary surface 600 and are symmetrical to each other.

[0042] Please refer to Figure 2 In this embodiment, the number of coils 220 and connecting bodies 216 are both 8, and the 8 connecting bodies 216 are connected to the outer wall of the first mounting body 212 at a certain interval, and one wire coil 220 is correspondingly installed on one connecting body 216, wherein the 8 coils 220 are divided into three groups, the first group includes 2 coils 220, and the two coils 220 are arranged at intervals in the horizontal direction, the second group includes 3 coils 220, and the third group includes 3 coils 220. The second group and the third group are arranged on the upper and lower sides of the first group, the second group is located above the first group, and the third group is located below the first group, and the number of turns of the coils 220 in the second group is greater than the number of turns of the coils 220 in the third group, and the number of turns of the two coils 220 in the first group can be set to be equal, so that the magnetic force generated by the electromagnetic bearing 200 is along the circumference of the entire rotor 300, and the rotor 300 can be stably suspended. Further, please refer to the figure, the magnetic poles of the magnetic field generated by the eight coils 220 can be distributed in the form of “N pole, N pole, S pole, S pole, N pole, N pole, S pole and S pole” along the circumference of the first mounting hole 2122. In this way, the rotor 300 can be more stably suspended in the first mounting hole 2122.

[0043] In another embodiment, the number of the connecting body 216 and the coil 220 are both multiple, and the connecting body 216 corresponds to the coil 220 one by one. The connecting body 216 is arranged on the outer wall of the first mounting body 212 along the circumferential direction of the first mounting body 212, and the horizontal plane where the axis of the rotor 300 is located is the boundary plane 600, and the coil 220 is arranged above the axis of the rotor 300. In this way, the coil 220 is arranged only above the axis of the rotor 300, and the magnetic force generated by the coil 220 being energized overcomes the gravity of the rotor 300, thereby making the rotor 300 suspended. Among them, the horizontal plane where the axis of the rotor 300 is located is the boundary plane 600, and being located above the boundary plane 600 means being located above the boundary plane 600 when the rotor 300 is placed horizontally.

[0044] Please refer to Figure 3 In another embodiment, the number of coils 220 is 3, the number of connecting bodies 216 is 8, and the 8 connecting bodies 216 are connected to the outer wall of the first installation body 212 at a certain interval, wherein three coils 220 are arranged above the axis of the rotor 300 and are arranged at a certain interval. In this way, the coils 220 are only arranged above the axis of the rotor 300, and the magnetic force generated by the coils 220 being energized overcomes the gravity of the rotor 300, thereby making the rotor 300 levitate.

[0045] During the operation of the compressor, the rotor 300 includes three working states: starting, high-speed rotation and stopping. In each working state, the rotation speed of the rotor 300 is different, the air film force generated between the rotor 300 and the hydrodynamic bearing 100 due to the dynamic pressure effect is also different, and the force of the air film acting on the inner wall of the first mounting hole 2122 is also different.

[0046] Specifically, in order to control the current of the coil 220 according to the operating condition of the rotor 300, and then control the magnetic field force generated by the coil 220, in this embodiment, the compressor assembly 10 also includes a pressure sensor 500 and a controller. The pressure sensor 500 is used to detect the pressure on the inner wall of the first mounting hole 2122. The electromagnetic bearing 200 also includes a power supply, which is used to supply current to the coil 220. The pressure sensor 500 and the power supply are both communicatively connected to the controller, and the controller controls the power supply to adjust the current supplied to the coil 220 according to the pressure detected by the pressure sensor 500.

[0047] For example, when the compressor is in the initial startup stage, at this time, after the coil 220 is energized, due to the electromagnetic induction effect, the coil 220 generates a magnetic field, and under the action of the magnetic field, an attraction is generated on the rotor 300. By controlling the magnitude of the current passing through the coil 220, a larger excitation is generated above the rotor 300, and a smaller excitation is generated by the coil 220 below, thereby overcoming the weight of the rotor 300 itself and being in a suspended state. At the same time, the pressure change is detected by the pressure sensor 500 to adjust the current magnitude of the coil 220, so that the rotor 300 is always in the center movement of the first mounting hole 2122. When the compressor motor is powered off, at this time, the air film force on the rotor 300 changes. At this time, the pressure detected by the pressure sensor 500 will change, thereby controlling the electromagnetic bearing 200 to start energizing, and the rotor 300 is stably suspended to a stop under the action of the magnetic force difference between the upper and lower parts.

[0048] Specifically, the controller may be a micro control unit or a PLC module.

[0049] The pressure sensor 500 includes a strain gauge, on which a non-magnetic material is arranged. The strain gauge senses the pressure of the inner wall of the first mounting hole 2122. The control module includes a proportional amplifier, which outputs corresponding current information based on the pressure information and feeds it back to the coil 220 to adjust the magnetic force.

[0050] Specifically, the hydrodynamic bearing 100 includes a bearing cylinder, a corrugated foil and a foil. The corrugated foil and the foil are arranged on the inner wall of the inner hole of the bearing cylinder along the circumference of the bearing cylinder, and the corrugated foil is arranged between the foil and the inner wall of the inner hole of the bearing cylinder. The corrugated foil is in an arc shape and has a corrugated support protrusion.

[0051] In addition, the present application also relates to a compressor, including the compressor assembly 10 in any of the above embodiments.

[0052] When the above compressor is in use, when the compressor is started, the electromagnetic bearing 200 is energized to generate a magnetic field, and under the action of the magnetic field, the rotor 300 is driven to suspend relative to the hydrodynamic bearing 100. As a result, the rotor 300 will not cause dry friction with the hydrodynamic bearing 100 to cause wear on the hydrodynamic bearing 100 when rotating; then, the rotor 300 performs high-speed rotation, continuously bringing gas with a certain viscosity into the gap between the rotor 300 and the hydrodynamic bearing 100. As the gas continues to enter, the air film generated between the rotor 300 and the hydrodynamic bearing 100 has a certain air film force. When the air film force is sufficient to balance the load of the rotor 300, the rotor 300 is The rotor 300 is completely separated from the hydrodynamic bearing 100. At this time, the hydrodynamic bearing 100 uses the air film force to support the normal operation of the rotor 300. When the compressor is started, the electromagnetic bearing 200 is energized to generate a magnetic field, and the rotor 300 is driven to suspend relative to the hydrodynamic bearing 100 under the action of the magnetic field. When the compressor is turned off, the electromagnetic bearing 200 is still energized to generate a magnetic field, and the rotor 300 is driven to suspend relative to the hydrodynamic bearing 100 under the action of the magnetic field. Furthermore, when the speed of the rotor 300 is reduced, dry friction with the hydrodynamic bearing 100 will not occur to cause wear to the hydrodynamic bearing 100. In this way, the service life of the hydrodynamic bearing 100 can be improved.

[0053] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it 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 a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0054] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0055] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only implementation method.

[0056] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0057] The above embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for those of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A compressor assembly, characterized in that: include: Hydrodynamic bearings and electromagnetic bearings; a rotor, wherein the rotor is rotatably inserted in the hydrodynamic bearing and the electromagnetic bearing, and the hydrodynamic bearing and the electromagnetic bearing are arranged side by side along the axial direction of the rotor, and the electromagnetic bearing is configured to drive the rotor to suspend relative to the hydrodynamic bearing when powered on; The electromagnetic bearing comprises a coil and a mounting bracket, wherein the coil is configured to generate a magnetic force when energized so that the resultant force can overcome the gravity of the rotor and cause the rotor to suspend; the mounting bracket is provided with a first mounting hole, and the rotor is rotatably inserted into the first mounting hole; A pressure sensor and a controller, wherein the pressure sensor is used to detect the pressure on the inner wall of the first mounting hole, and the electromagnetic bearing also includes a power supply, which is used to supply current to the coil. The pressure sensor and the power supply are both communicatively connected to the controller, and the controller controls the power supply to adjust the current supplied to the coil according to the pressure detected by the pressure sensor.

2. The compressor assembly according to claim 1, characterized in that The coil is disposed on the mounting bracket, and the coil is configured such that the resultant magnetic force generated when energized can overcome the gravity of the rotor to cause the rotor to float in the first mounting hole.

3. The compressor assembly according to claim 2, characterized in that The mounting bracket includes a first mounting body, a connecting body and a second mounting body, the first mounting body is provided with the first mounting hole, the second mounting body is provided with the second mounting hole, the first mounting body is arranged in the second mounting hole, the first mounting body is connected to the inner wall of the second mounting hole through the connecting body, and the coil is wound around the connecting body.

4. The compressor assembly according to claim 3, characterized in that The number of the connecting bodies and the number of the coils are both multiple, and the connecting bodies correspond to the coils one by one. The connecting bodies are arranged on the outer wall of the first mounting body at intervals along the circumference of the first mounting body, and the horizontal plane where the axis of the rotor is located is used as the boundary surface. The number of turns of the coil located above the boundary surface is greater than the number of turns of the coil located below the boundary surface.

5. The compressor assembly according to claim 3, characterized in that The number of the connecting bodies and the coils are both multiple, and the connecting bodies correspond to the coils one by one. The connecting bodies are arranged on the outer wall of the first mounting body at intervals along the circumference of the first mounting body, and the horizontal plane where the axis of the rotor is located is used as the boundary plane, and the coils are arranged above the boundary plane.

6. The compressor assembly according to claim 4 or 5, characterized in that It also includes a non-magnetic conductive part, which is fixed to the first installation body and arranged between two adjacent coils.

7. The compressor assembly according to claim 1, characterized in that A gap formed between the rotor and the dynamic pressure bearing is larger than a gap formed between the rotor and the electromagnetic bearing.

8. The compressor assembly according to claim 1, characterized in that It also includes a bearing seat, and the hydrodynamic bearing and the electromagnetic bearing are both fixedly arranged on the bearing seat.

9. The compressor assembly according to claim 1, characterized in that The number of the electromagnetic bearings is two, the number of the hydrodynamic bearings is two, the hydrodynamic bearings and the electromagnetic bearings are arranged side by side, and each of the electromagnetic bearings is arranged between the two hydrodynamic bearings.

10. A compressor, characterized in that: A compressor assembly comprising any one of claims 1 to 9.

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