Two-stage full air-cooled structure of magnetic suspension gas compressor

Abstract

The application discloses a two-stage full-air cooling structure of a magnetic suspension gas compressor, and relates to the technical field of gas compressors. The compressor body comprises a casing, a stator, a rotor and a centrifugal impeller. The two-stage full-air cooling structure of the magnetic suspension gas compressor comprises the following: a first hole channel formed in the stator, the casing being provided with a first air inlet and a second air inlet, and the first hole channel being communicated with the first air inlet and a gap; a second hole channel formed in an end plate, one end of the second hole channel being communicated with the second air inlet and the inner side of the end plate; a third hole channel formed in a magnetic suspension bearing assembly, the third hole channel being communicated with the second hole channel and the gap; and a fourth hole channel formed in a rotor shaft, one end of the fourth hole channel being communicated with the gap, and the other end of the fourth hole channel being communicated with the outer side of the end plate. The application solves the problems of complex structure and high maintenance cost of the magnetic suspension air compressor using a traditional water cooling system.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of air compressors, in particular to a two-stage full-air-cooling structure of a magnetic suspension gas compressor. BACKGROUND

[0002] A magnetic suspension air compressor is an air compression device that uses magnetic suspension technology to achieve contactless operation. It has characteristics such as high efficiency, low noise, and long service life, and is widely used in industrial fields. The following are its core features and applications:

[0003] The core principle of a magnetic suspension air compressor is to suspend the rotor in the air through electromagnetic force, achieving frictionless and oil-free operation. The rotor rotates at a speed of 20,000 rpm, maintaining a small gap (equivalent to 1% of the diameter of a hair) with the stator, and does not require lubricating oil and mechanical bearings during operation.

[0004] Existing magnetic suspension air compressors use traditional water cooling systems, which require the configuration of heat exchangers, circulating pump sets, and complex pipelines, resulting in a complex structure of the magnetic suspension air compressor and high maintenance costs. SUMMARY

[0005] To overcome the defects of the prior art, a two-stage full-air-cooling structure of a magnetic suspension gas compressor is provided to solve the problem of complex structure and high maintenance cost of the magnetic suspension air compressor using the traditional water cooling system.

[0006] To achieve the above-mentioned purpose, a two-stage full-air-cooling structure of a magnetic suspension gas compressor is provided, comprising:

[0007] The compressor body includes a housing, a stator fixedly arranged in the housing, a rotor rotatably arranged coaxially in the stator, and two centrifugal impellers connected coaxially to the two ends of the rotor shaft. The opposite ends of the housing are provided with end plates, the end plates are provided with shaft holes, the rotor shaft of the rotor is rotatably arranged in the shaft hole, the two ends of the rotor shaft extend to the outside of the two end plates, and a magnetic suspension bearing assembly is coaxially arranged in the housing. The magnetic suspension bearing assembly is arranged around the end of the rotor shaft, and a gap is formed between one side of the magnetic suspension bearing assembly and the stator. The two-stage full-air-cooling structure of the magnetic suspension gas compressor comprises:

[0008] A first hole is formed in the stator, the housing is provided with a first air inlet and a second air inlet, and the first hole is connected to the first air inlet and the gap;

[0009] A second hole is formed in the end plate, one end of the second hole is connected to the second air inlet and the inside of the end plate;

[0010] a third hole formed in the magnetic bearing assembly, the third hole being in communication with the second hole and the gap;

[0011] a fourth hole formed in the rotor shaft, one end of the fourth hole being in communication with the gap, the other end of the fourth hole being in communication with the outside of the end plate, the rotor driving the centrifugal impeller to rotate to reduce the air pressure value of the outside of the end plate, so that the cooling gas outside of the casing is sucked into the casing through the first suction port and the second suction port, and then is merged into the gap through the first hole, the second hole and the third hole, and finally is discharged to the outside of the end plate through the fourth hole.

[0012] Further, the first suction port is in a strip shape and is arranged along the circumferential direction of the casing.

[0013] Further, the first hole comprises:

[0014] a first radial hole section penetrating through the stator and being in communication with the first suction port;

[0015] a first axial hole section being in communication with the first radial hole section and the gap.

[0016] Further, the shape and size of the hole of the first radial hole section are adapted to the shape and size of the first suction port.

[0017] Further, the first axial hole section is in a plurality, and the plurality of first axial hole sections are arranged at intervals along the circumferential direction of the stator.

[0018] Further, the magnetic bearing assembly comprises a radial magnetic bearing and an axial magnetic bearing arranged coaxially, and the third hole comprises a second axial hole section opened on the radial magnetic bearing and a third axial hole section opened on the axial magnetic bearing.

[0019] Further, the fourth hole comprises:

[0020] a second radial hole section penetrating through the rotor shaft and being in communication with the gap;

[0021] a fourth axial hole section being in communication with the second radial hole section and the outside of the end plate.

[0022] Further, the fourth axial hole section comprises:

[0023] a first flow guide hole, one end of the first flow guide hole being in communication with the second radial hole section;

[0024] A spiral flow guide groove is formed on the circumferential surface of the rotor shaft, the spiral flow guide groove and the hole wall of the shaft hole form a second flow guide hole, one end of the second flow guide hole is connected to the other end of the first flow guide hole, and the other end of the second flow guide hole is communicated to the outside of the end plate.

[0025] The magnetic suspension gas compressor with the double-stage full-air cooling structure has the advantages that the double-stage full-air cooling structure of the magnetic suspension gas compressor is innovative and solves the problems of the prior art, the double-stage full-air cooling structure of the magnetic suspension gas compressor is provided with multiple sets of heat dissipation channels on the radial surface of the casing and corresponds to the cooling requirements of the stator winding, the bearing and the rotor, the double-stage full-air cooling structure of the magnetic suspension gas compressor is provided with centrifugal impellers on the two sides of the casing and spiral flow guide grooves at the two ends of the rotor shaft, the cooling gas efficiency is doubled through the double-stage pressurization design, compared with the traditional water cooling system, the double-stage full-air cooling structure of the magnetic suspension gas compressor can realize the accurate cooling of the stator coil and the bearing rotor, the heat dissipation efficiency is significantly improved through the directional airflow strengthening technology, and finally the temperature balance control between the components of the motor is achieved. BRIEF DESCRIPTION OF DRAWINGS

[0026] Other characteristics, objects and advantages of the present application will become more apparent from the following detailed description of non-restrictive embodiments, made with reference to the attached drawings:

[0027] Figure 1 FIG. 1 is a structural schematic diagram of a double-stage full-air cooling structure of a magnetic suspension gas compressor according to an embodiment of the present application.

[0028] Figure 2 FIG. 2 is a sectional view of the double-stage full-air cooling structure of the magnetic suspension gas compressor according to the embodiment of the present application.

[0029] Figure 3 FIG. 3 is an exploded structural schematic diagram of the magnetic suspension gas compressor according to the embodiment of the present application.

[0030] Figure 4 FIG. 4 is a structural schematic diagram of an end of the magnetic suspension gas compressor according to the embodiment of the present application.

[0031] Figure 5 FIG. 5 is a structural schematic diagram of a stator of the magnetic suspension gas compressor according to the embodiment of the present application.

[0032] Figure 6 FIG. 6 is a structural schematic diagram of a spiral flow guide groove of the magnetic suspension gas compressor according to the embodiment of the present application.

[0033] Figure 7 FIG. 7 is a cooling gas flow direction schematic diagram of the double-stage full-air cooling structure of the magnetic suspension gas compressor according to the embodiment of the present application.

[0034] REFERENCE NUMERALS:

[0035] The shell 1, the end plate 11, the first air inlet a, the second air inlet b, the gap c, and the integrated sensor 12;

[0036] The stator 2;

[0037] The rotor 3, the rotor shaft 31, the rotor magnet 32, and the magnet protection sleeve 33;

[0038] The centrifugal impeller 4;

[0039] The magnetic suspension bearing assembly 5, the radial magnetic suspension bearing 51, and the axial magnetic suspension bearing 52;

[0040] The first hole A, the first radial hole section d, and the first axial hole section e;

[0041] The second hole B;

[0042] The third hole C, the second axial hole section f, and the third axial hole section g;

[0043] The fourth hole D, the second radial hole section h, the first flow guide hole i, and the spiral flow guide groove j. DETAILED DESCRIPTION

[0044] The application will be further described below in conjunction with the drawings and embodiments. It should be understood that the specific embodiments described herein are merely intended for the purpose of interpretation of the related application, and are not limiting of the application. In addition, it should be noted that only the parts related to the application are shown in the drawings for the purpose of description.

[0045] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict. The present application will be described in detail below with reference to the drawings and in conjunction with the embodiments.

[0046] Reference Figures 1 to 7 As shown in the drawings, the present application provides a two-stage full-air-cooled structure of a magnetic suspension gas compressor, which comprises a first hole A, a second hole B, a third hole C, and a fourth hole D. The first hole A, the second hole B, the third hole C, and the fourth hole D form a hole group for cooling gas flow.

[0047] In the present embodiment, the compressor body comprises a shell 1, a stator 2, a rotor 3, and a centrifugal impeller 4. The structure of the die-casting machine body is arranged in axial symmetry in the axial direction thereof.

[0048] The shell 1 is in a cylindrical shape. The shell has two opposite ends in the axial direction thereof. The shell 1 is respectively provided with an end plate 11 at the two opposite ends, so that the inner cavity of the shell is in a sealed state. The end plate 11 is provided with a shaft hole. The shaft hole is coaxially arranged with the shell.

[0049] The stator 2 is fixedly arranged in the casing 1. The stator is fixedly arranged on the inner wall of the casing. The stator is located at the middle position of the casing.

[0050] The rotor 3 is rotatably arranged in the stator 2, and the rotor is coaxially arranged with the stator. The rotor shaft 31 at both ends of the rotor 3 is rotatably arranged in the shaft hole of the end plate.

[0051] The rotor shaft 31 at both ends of the rotor 3 extends to the outside of the end plate 11. The rotor 3 at both ends of the rotor shaft 31 is provided with two centrifugal impellers 4.

[0052] The magnetic suspension bearing assembly 5 is coaxially arranged in the casing 1. In this embodiment, an integrated sensor 12 is also arranged in the casing. The magnetic suspension bearing assembly is arranged between the casing and the rotor shaft, and the integrated sensor 12 is used to realize the support and suspension of the rotor.

[0053] The magnetic suspension bearing assembly 5 is arranged at the end of the rotor shaft 31. The magnetic suspension bearing assembly is arranged between the end plate and the stator. Referring to Figure 2 , the magnetic suspension bearing assembly 5 is arranged on one side of the stator 2 to form a gap c.

[0054] In this embodiment, the first hole A of the hole group is formed in the stator 2. The casing 1 is provided with a first air inlet a and a second air inlet b. The first hole A is communicated with the first air inlet a and the gap c. Among them, the first air inlet is arranged at the middle position of the casing, and the second air inlet is arranged at the position close to the end plate of the casing.

[0055] Referring to Figure 1 , the first air inlet on the casing is in the shape of a long strip. The first air inlet is arranged along the circumferential direction of the casing 1.

[0056] In this embodiment, two first air inlets are arranged at the middle position of the casing. Each first air inlet includes four first air inlets. The four air inlets are arranged at equal intervals along the circumferential direction of the casing.

[0057] Referring to Figure 2 , the first hole A includes a first radial hole section d and a first axial hole section e.

[0058] Among them, the first radial hole section is arranged along the radial direction of the stator. The first axial hole section is arranged along the axial direction of the stator. The stator is in the shape of a ring. The inner side of the stator 2 is provided with a three-layer structure of the rotor 3, the magnetic steel protection sleeve 33 and the rotor magnetic steel 32. The magnetic suspension bearing assembly is arranged between the rotor shaft at both ends of the rotor and the casing, that is, the gap is formed at both ends of the rotor.

[0059] The first radial hole section d is formed through the inner and outer ring surfaces of the stator 2. The inner ring surface of the stator and the rotor are formed with a gap, which is communicated with the air gap. One end of the first radial hole section d is communicated with the first air inlet a. The first axial hole section e is communicated with the other end of the first radial hole section d and the air gap c. The first hole channel guides the cooling gas sucked in by the first air inlet into the air gap, while effectively reducing the temperature of the stator (coil) (as shown by the middle red dotted arrow line). On the other hand, part of the cooling gas enters the gap between the stator and the rotor via the first radial hole section, and then flows into the air gap, which also reduces the temperature of the rotor. Figure 7

[0060] Referring to Figure 5 , the shape and size of the orifice of the first radial hole section d are adapted to the shape and size of the first air inlet a. In combination with Figure 2 and Figure 7 , the first axial hole section e is provided in a plurality of numbers. The plurality of first axial hole sections e are arranged at intervals in the circumferential direction of the stator 2.

[0061] Referring to Figure 2 , the second hole channel B of the hole channel group is formed in the end plate 11. One end of the second hole channel B is communicated with the second air inlet b and the inner side of the end plate 11. One end of the second hole channel is formed on the circumferential surface of the end plate to be connected to the second air inlet of the housing. The other end of the second hole channel is formed on the inner side surface of the end plate to be communicated with the inner cavity of the housing.

[0062] Continuing to refer to Figure 2 and Figure 7 , the third hole channel C of the hole channel group is formed in the magnetic bearing assembly 5. The third hole channel C is communicated with the second hole channel B and the air gap c.

[0063] In this embodiment, the magnetic bearing assembly 5 includes a radial magnetic bearing 51 and an axial magnetic bearing 52. The radial magnetic bearing 51 and the axial magnetic bearing 52 are coaxially arranged.

[0064] The third hole channel C includes a second axial hole section f and a third axial hole section g.

[0065] The second axial hole section f is formed on the radial magnetic bearing 51.

[0066] The third axial hole section g is formed on the axial magnetic bearing 52.

[0067] In this embodiment, an integrated sensor 53 is also mounted between the radial magnetic bearing 51 and the end plate. Similarly, the integrated sensor 53 is formed with a fifth axial hole section. The second axial hole section, the third axial hole section, and the fifth axial hole section are coaxially arranged.

[0068] The second axial hole section, the third axial hole section, and the fifth axial hole section are provided in a plurality of numbers, respectively.​

[0069] The plurality of second axial hole segments are arranged along the circumferential direction of the radial magnetic bearing 51. The plurality of third axial hole segments are arranged along the circumferential direction of the axial magnetic bearing 52. The plurality of fifth axial hole segments are arranged along the circumferential direction of the integrated sensor 53.

[0070] The cooling gas (as shown by the black dotted arrow line in FIG. 4) sucked in through the second air inlet is introduced into the casing through the second hole channel, and then introduced into the gap through the fifth axial hole segment, the second axial hole segment and the third axial hole segment in sequence. In this way, the temperature of the radial magnetic bearing 51, the axial magnetic bearing 52 and the integrated sensor 53 can be effectively reduced when the cooling gas passes through the third hole channel. Figure 7

[0071] The fourth hole channel D of the hole channel group is formed in the rotor shaft 31. One end of the fourth hole channel D is communicated with the gap c. The other end of the fourth hole channel D is communicated with the outside of the end plate 11.

[0072] Continuing to refer to FIG. 5, Figure 2 and Figure 7 the fourth hole channel D includes a second radial hole segment and a second axial hole segment communicated with the gap c.

[0073] The second radial hole segment is arranged at both ends of the rotor. The second radial hole segment h penetrates the rotor shaft 31 and the end plate of the rotor. The second radial hole segment is communicated with the gap c.

[0074] The fourth axial hole segment is communicated with the second radial hole segment h and the outside of the end plate 11.

[0075] Referring to FIG. 6, Figure 6 and Figure 7 the fourth axial hole segment includes a first flow guide hole i and a spiral flow guide groove j.

[0076] The first flow guide hole i is communicated with the second radial hole segment h at one end. The spiral flow guide groove j is formed on the circumferential surface of the rotor shaft 31. The spiral flow guide groove j is arranged around the circumferential surface of the rotor shaft and has a spiral shape. After the rotor shaft is assembled in the shaft hole of the end plate, the spiral flow guide groove j and the hole wall of the shaft hole form a second flow guide hole. One end of the second flow guide hole is connected to the other end of the first flow guide hole i. The other end of the second flow guide hole is communicated with the outside of the end plate 11.

[0077] Specifically, the cooling gas (as shown by the black dotted arrow line in FIG. 4) introduced into the gap is then discharged to the outside of the end plate through the fourth hole channel. In this process, the cooling gas effectively reduces the temperature of the rotor and the rotor shaft. On the other hand, the unique spiral-shaped second flow guide hole prolongs the flow path of the cooling gas, thereby improving the cooling efficiency. Figure 7 In combination with FIG. 7,

[0078] Figure 7 ​​As shown, the rotor 3 drives the centrifugal impeller 4 by driving the driving structure, and the centrifugal impeller 4 rotates. When the centrifugal impeller 4 rotates at high speed, the gas flow on the outside of the end plate generates pressure, forming an effect similar to a small vacuum pump. By rotating the centrifugal impeller 4 to reduce the air pressure value on the outside of the end plate 11, the cooling gas on the outside of the casing 1 is sucked into the casing 1 through the first suction port a and the second suction port b, and then flows into the gap c through the first hole A, the second hole B and the third hole C, and finally is discharged to the outside of the end plate 11 through the fourth hole D.

[0079] When the two centrifugal impellers at both ends of the casing are running, the cooling gas outside the casing is sucked into the casing from the first suction port in the middle of the casing and the second suction port at both ends of the casing, respectively. The two cooling gases are then respectively merged into the gap of the casing through the first hole, the second hole and the third hole, one of which sequentially cools the integrated sensor, then passes through the radial magnetic bearing again, and finally passes through the axial magnetic bearing; the other cooling gas is used to cool the stator coil, and the stator, the magnetic steel protection sleeve and the rotor magnetic steel are cooled. The two cooling gases are respectively merged into the gap, and then discharged to the outside of the end plate through the fourth hole. The rotor and the rotor shaft are uniformly cooled by the spiral flow guide groove on the rotor shaft.

[0080] The two-stage full-air cooling structure of the magnetic suspension gas compressor of the present application is an innovative air cooling structure solution proposed in view of the shortcomings of the existing magnetic suspension gas compressor cooling technology. The two-stage full-air cooling structure of the magnetic suspension gas compressor of the present application optimizes the casing structure design, sets multiple groups of heat dissipation channels on the radial surface of the casing, and respectively meets the cooling requirements of the stator winding, the bearing and the rotor. Specifically, the two-stage full-air cooling structure of the magnetic suspension gas compressor of the present application symmetrically configures centrifugal impellers on both sides of the casing and sets spiral flow guide grooves at both ends of the rotor shaft, so that the cooling gas efficiency is multiplied by the two-stage pressurization design. Compared with the traditional water cooling system, the two-stage full-air cooling structure of the magnetic suspension gas compressor of the present application not only realizes the precise cooling of the stator coil and the bearing rotor, but also significantly improves the heat dissipation efficiency through directional airflow strengthening technology, and finally achieves temperature balance control among the components of the motor.

[0081] The above description is only the preferred embodiment of the present application and the explanation of the applied technical principles. Those skilled in the art should understand that the scope of the application involved in the present application is not limited to the technical solutions formed by the specific combination of the above technical features, and also covers other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the inventive concept. For example, the above features are replaced with the technical features disclosed in the present application (but not limited to) having similar functions to form a technical solution.

Claims

1. A two-stage, fully air-cooled structure for a magnetically levitated gas compressor, characterized in that, The compressor body includes a casing, a stator fixed within the casing, a rotor rotatably and coaxially mounted within the stator, and two centrifugal impellers coaxially connected to both ends of the rotor shaft. End plates are mounted at opposite ends of the casing, each end plate having a shaft hole through which the rotor shaft rotatably passes. Both ends of the rotor shaft extend to the outer sides of the end plates. A magnetic levitation bearing assembly is coaxially mounted within the casing, sleeved on the end of the rotor shaft. A gap is formed between one side of the magnetic levitation bearing assembly and the stator. The two-stage, fully air-cooled structure of the magnetic levitation gas compressor includes: A first channel is formed in the stator, and the housing has a first air intake and a second air intake. The first channel connects the first air intake and the gap. A second channel is formed in the end plate, and one end of the second channel is connected to the second air intake and the inner side of the end plate; A third channel is formed in the magnetic levitation bearing assembly, and the third channel connects the second channel and the gap; A fourth channel is formed in the rotor shaft, one end of the fourth channel is connected to the gap, and the other end of the fourth channel is connected to the outside of the end plate; The fourth channel includes: a second radial section that penetrates the rotor shaft and communicates with the gap; and a fourth axial section that communicates with the second radial section and the outer side of the end plate. The fourth axial bore section includes: a first guide hole, one end of which is connected to the second radial bore section; a spiral guide groove formed on the circumferential surface of the rotor shaft, the spiral guide groove and the bore wall of the shaft hole forming a second guide hole, one end of which is connected to the other end of the first guide hole, and the other end of which is connected to the outside of the end plate.

2. The two-stage all-air-cooled structure of the magnetic levitation gas compressor according to claim 1, characterized in that, The first air intake is elongated and is arranged along the circumference of the housing.

3. The two-stage all-air-cooled structure of the magnetic levitation gas compressor according to claim 2, characterized in that, The first channel includes: The first radial hole section penetrates the stator and is connected to the first air intake; The first axial hole section connects the first radial hole section and the gap.

4. The two-stage all-air-cooled structure of the magnetic levitation gas compressor according to claim 3, characterized in that, The shape and size of the orifice of the first radial section are adapted to the shape and size of the first intake port.

5. The two-stage all-air-cooled structure of the magnetic levitation gas compressor according to claim 3, characterized in that, The number of the first axial hole segments is multiple, and the multiple first axial hole segments are spaced apart along the circumferential direction of the stator.

6. The two-stage all-air-cooled structure of the magnetic levitation gas compressor according to claim 1, characterized in that, The magnetic levitation bearing assembly includes a radial magnetic levitation bearing and an axial magnetic levitation bearing arranged coaxially, and the third channel includes a second axial hole segment formed on the radial magnetic levitation bearing and a third axial hole segment formed on the axial magnetic levitation bearing.

7. The two-stage all-air-cooled structure of the magnetic levitation gas compressor according to claim 1, characterized in that, The rotor drives the centrifugal impeller to rotate. The rotation of the centrifugal impeller reduces the air pressure value on the outside of the end plate, so that the cooling gas on the outside of the casing is drawn into the casing through the first and second air inlets, then flows into the gap through the first, second and third channels, and finally is discharged into the outside of the end plate through the fourth channel.

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