Magnetic suspension blower and magnetic suspension compressor

Abstract

The utility model provides a magnetic suspension air blower and a magnetic suspension compressor, the magnetic suspension air blower comprises a casing, an air blowing impeller, a rotating shaft, a motor assembly and an axial magnetic suspension bearing, the casing is provided with an air blowing port and an air outlet, the axial magnetic suspension bearing comprises a thrust disc, and the thrust disc is fixedly sleeved on the rotating shaft; a via hole communicated with the interior is further formed in the machine shell, and the rotating shaft is rotationally matched with the via hole; a gap between the rotating shaft and the via hole forms an air inlet channel, a first heat dissipation flow channel is arranged in the machine shell, and the first heat dissipation flow channel is communicated with the air inlet channel; and the first heat dissipation flow channel is used for introducing air of the air inlet channel and enabling the air to flow through the thrust disc so as to dissipate heat of the thrust disc. The air inlet channel formed between the rotating shaft and the via hole can assist in air inlet and increase the air inlet amount, and the first heat dissipation flow channel guides air of the air inlet channel to the thrust disc, so that heat dissipation can be conducted on the thrust disc, the temperature of the thrust disc can be reduced, and the cooling effect of the thrust disc is good.

Description

Technical Field

[0001] The utility model belongs to the technical field of magnetic suspension blowers, and in particular relates to a magnetic suspension blower and a magnetic suspension compressor. Background Art

[0002] Magnetic levitation blowers generate significant heat during operation. Excessive heat can cause motor malfunctions. When the motor is shut down, the cooling impeller fails to function properly, causing the motor to rapidly heat up, impacting its service life. Therefore, heat dissipation design is essential. Existing magnetic levitation blowers primarily use air cooling and water cooling. These utilize a series single-channel structure, where the cooling air absorbs heat as it passes through the axial stator windings, increasing the cooling air temperature. However, the thrust plate in existing magnetic levitation blowers exhibits poor cooling performance, requiring improvement. Utility Model Content

[0003] Therefore, the utility model provides a magnetic levitation blower and a magnetic levitation compressor, which can solve the technical problem of high temperature at the thrust plate of the magnetic levitation blower in the prior art.

[0004] In order to solve the above problems, the utility model provides a magnetic levitation blower, comprising a casing, a blast impeller, a rotating shaft, a motor assembly and an axial magnetic levitation bearing, wherein the casing is provided with an air blast port and an air outlet, and the motor assembly is used to drive the rotating shaft to rotate, so that the rotating shaft drives the blast impeller to rotate, so that the blast impeller drives the air flow to enter the air from the air blast port; the axial magnetic levitation bearing comprises a first axial stator, a second axial stator and a thrust disk located between the first axial stator and the second axial stator, and the thrust disk is sleeved on the rotating shaft; the casing is further provided with a through hole communicating with the interior, and the rotating shaft rotatably cooperates with the through hole;

[0005] The gap between the rotating shaft and the through hole forms an air inlet channel, and the housing has a first heat dissipation channel, which is connected to the air inlet channel; the first heat dissipation channel is used to introduce wind from the air inlet channel and allow the wind to flow through the thrust plate to dissipate heat from the thrust plate.

[0006] In some embodiments, the thrust plate is provided with an air hole structure running through both axial ends, and the air hole structure constitutes a part of the first heat dissipation channel, so that at least a part of the wind introduced from the air inlet channel into the first heat dissipation channel flows through the thrust plate through the air hole structure.

[0007] In some embodiments, the rotating shaft has a first section, a second section, and a third section connected in sequence along the axial direction, the rotating shaft is rotatably engaged with the through-hole through the first section, and the rotating shaft is sleeved on the axial magnetic bearing through the third section; the second section is sleeved with a bearing seat and a first radial magnetic bearing in sequence along the axial direction, and the first radial magnetic bearing is close to the axial magnetic bearing relative to the bearing seat;

[0008] The first heat dissipation channel is used to allow the wind flowing out of the air inlet channel to flow through the bearing seat and the first radial magnetic bearing in sequence, and then flow to the thrust plate.

[0009] In some embodiments, the housing further comprises a second heat dissipation channel, which is connected to the air blast port. The second heat dissipation channel is used to introduce wind from the air blast port and allow the wind to flow through the second axial stator; the second axial stator is closer to the blower impeller relative to the first axial stator.

[0010] In some embodiments, the second axial stator has a first side facing away from the first axial stator, and air in the second heat dissipation channel is configured to flow through the second axial stator from the first side.

[0011] In some embodiments, the second heat dissipation channel is used to allow air to flow through the motor assembly to dissipate heat from the motor assembly.

[0012] In some embodiments, the casing further includes an air outlet channel, and the first heat dissipation channel and the second heat dissipation channel are used to guide the wind out of the air outlet through the air outlet channel after intersecting inside the casing, wherein the air outlet channel is used to dissipate heat from the motor assembly.

[0013] In some embodiments, a heat dissipation sleeve is provided between the motor assembly and the inner wall of the housing, and the heat dissipation sleeve is used to dissipate heat from the stator core;

[0014] The heat dissipation sleeve has heat dissipation holes inside, and the heat dissipation holes constitute a part of the air outlet flow channel, so that the air outlet flow channel dissipates heat to the motor component through the heat dissipation sleeve.

[0015] In some embodiments, the motor assembly includes a stator and a rotor, the rotor is fixedly connected to the rotating shaft, and the stator is used to drive the rotating shaft to rotate by driving the rotor;

[0016] The motor assembly is located between the second axial stator and the blower impeller. A second air gap is provided between the end of the stator facing away from the blower impeller and the first side. The first heat dissipation channel and the second heat dissipation channel intersect at the second air gap.

[0017] In some embodiments, when a heat dissipation sleeve is provided between the motor assembly and the inner wall of the housing, the motor assembly is sleeved in the heat dissipation sleeve via the stator, the heat dissipation sleeve is located between the second axial stator and the blower impeller, the heat dissipation sleeve has a second side and a third side opposite to each other in the axial direction, the second side is closer to the second axial stator relative to the third side, and the heat dissipation hole has a first opening on the second side;

[0018] There is a gap between the second side and the first side, so that the first opening is connected to the second air outlet gap.

[0019] In some embodiments, the heat dissipation hole is a blind hole extending from the second side to the third side, an air outlet connected to the heat dissipation hole is provided on the outer wall of the heat dissipation sleeve, and the air outlet channel is connected to the air outlet through the air outlet.

[0020] In some embodiments, when the thrust plate is provided with an air hole structure penetrating through both axial ends, the total opening area of ​​the air hole structure at either end of the thrust plate is St;

[0021] The motor assembly includes a stator and a rotor, the rotor is fixedly connected to the rotating shaft, and the stator is used to drive the rotating shaft to rotate by driving the rotor; the gap between the stator and the rotor forms an air passage, and the air passage constitutes a part of the second heat dissipation channel; wherein, the cross-sectional area of ​​the air passage at its narrowest point in the section perpendicular to the axial direction of the rotating shaft is Sq, and 0.6≤St / Sq≤0.8.

[0022] In some embodiments, the motor assembly includes a stator and a rotor, the rotor is fixedly connected to the rotating shaft, and the stator is used to drive the rotating shaft to rotate by driving the rotor; the gap between the stator and the rotor forms an air passage, and the air passage constitutes a part of the second heat dissipation channel; wherein, the cross-sectional area of ​​the air passage at its narrowest point in the cross section perpendicular to the axial direction of the rotating shaft is Sq; the opening area of ​​the air blast port is S; wherein, 0.12≤Sq / S≤0.21.

[0023] In some embodiments, in the axial direction along the rotating shaft, the housing has a first end and a second end opposite to each other, and the housing has a cylindrical section located between the first end and the second end, the outer radius of the cylindrical section at any point in the axial direction of the rotating shaft is Rt, and the inner radius is Rtn, 1.05≤Rt / Rtn≤1.1.

[0024] In some embodiments, the total air inlet area of ​​the magnetic levitation blower is S 总进 The total outlet area of ​​the magnetic levitation blower is S总出 , where 0.13≤S 总进 / S 总出 ≤0.22.

[0025] In some embodiments, the radius of the widest part of the via hole is Rx, and the radius of the tuyere is R, wherein 0.21≤Rx / R≤0.22.

[0026] In some embodiments, the housing has a first end and a second end opposite to each other in the axial direction of the rotating shaft, the housing has a side surface located between the first end and the second end, and the air outlet is provided on the side surface;

[0027] One of the air blast port and the air inlet passage is located at the first end, and the other is located at the second end.

[0028] The utility model also provides a magnetic levitation compressor, which comprises any one of the magnetic levitation blowers described above.

[0029] In some embodiments, the magnetic levitation compressor further includes a volute and an impeller, the volute having a compression chamber, the impeller being rotatably disposed in the compression chamber, and the impeller being configured to compress the gas in the compression chamber when rotating; the impeller being located on a side of the casing away from the tuyere, the rotating shaft extending out of the through hole, and the rotating shaft being fixedly connected to the impeller so that the rotating shaft can drive the impeller to rotate;

[0030] The through hole is communicated with the compression chamber, wherein a comb tooth structure is provided on an inner wall of the through hole.

[0031] The magnetic levitation blower and magnetic levitation compressor provided by the utility model have the following beneficial effects:

[0032] 1. The air inlet channel formed between the rotating shaft and the through hole can assist the air intake and increase the air intake volume. The first heat dissipation channel guides the wind from the air inlet channel to the thrust plate, thereby dissipating the heat of the thrust plate, which is beneficial to reducing the temperature of the thrust plate and achieving a better cooling effect of the thrust plate.

[0033] 2. The airflow from the second heat dissipation channel dissipates heat when passing through the second axial stator. The cooled second axial stator cools the thrust plate, allowing the airflow from the second heat dissipation channel to indirectly cool the thrust plate through the second axial stator. The second heat dissipation channel, in conjunction with the first heat dissipation channel, enhances the heat dissipation and cooling effect of the thrust plate.

[0034] 3. Since the air in the second heat dissipation flow channel and the air outlet flow channel both flows through the motor assembly, the second heat dissipation flow channel cooperates with the air outlet flow channel to perform secondary heat dissipation on the motor assembly, thereby improving the heat dissipation effect of the motor assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following is a brief introduction to the drawings required for the embodiments or the description of the prior art. The drawings described below are merely exemplary. For those skilled in the art, other implementation drawings can be derived from the provided drawings without inventive effort.

[0036] Figure 1 This is an assembly structure diagram of the magnetic levitation blower of the present utility model;

[0037] Figure 2 This is a cross-sectional view of the magnetic levitation blower of the present utility model;

[0038] Figure 3 It is a schematic diagram reflecting the air inlet channel between the rotating shaft and the via hole;

[0039] Figure 4 It is a schematic diagram reflecting the vias on the casing;

[0040] Figure 5 It is a schematic diagram reflecting the comb-tooth structure on the inner wall of the via.

[0041] The accompanying drawings are:

[0042] 1. Casing; 2. Air outlet; 3. Blower impeller; 4. Rotating shaft; 5. Heat dissipation sleeve; 6. Motor assembly; 8. Axial magnetic bearing; 10. Air outlet; 12. First radial magnetic bearing; 13. Second radial magnetic bearing; 16. Comb structure; 17. Bearing seat; 18. Current collector; 19. Air passage; 20. Support seat; 51. Heat dissipation hole; 61. Stator; 62. Rotor; 81. First axial stator; 82. Thrust plate; 83. Second axial stator; 101, first end; 102, second end; 103, cylindrical section; 160, through hole; 161, air inlet channel; 121, first radial stator; 122, first radial rotor; 131, second radial stator; 132, second radial rotor; 511, air outlet; 512, first opening; 611, stator core; 612, coil winding; 821, air hole structure; 831, first side; 832, second air gap. DETAILED DESCRIPTION

[0043] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is in no way intended to limit the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0044] In the description of the present invention, it needs to be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "horizontal, vertical, vertical, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings. They are only for the convenience of describing the present invention and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present invention; the directional words "inside and outside" refer to the inside and outside relative to the outline of each component itself.

[0045] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used herein to describe the spatial positional relationship of a device or feature to other devices or features as shown in the figures. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figures. For example, if the device in the drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0046] In addition, it should be noted that the use of words such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. Unless otherwise stated, the above words have no special meaning and therefore cannot be understood as limiting the scope of protection of this utility model.

[0047] See also Figure 1-Figure 5As shown, according to an embodiment of the present invention, a magnetic levitation blower is provided, comprising a casing 1, a blower impeller 3, a rotating shaft 4, a motor assembly 6 and an axial magnetic levitation bearing 8. The casing 1 is provided with an air blast port 10 and an air outlet 2. The motor assembly 6 is used to drive the rotating shaft 4 to rotate, so that the rotating shaft 4 drives the blower impeller 3 to rotate, so that the blower impeller 3 drives the air flow to enter from the air blast port 10. The axial magnetic levitation bearing 8 includes a first axial stator 81, a second axial stator 83 and a thrust plate 82 located between the first axial stator 81 and the second axial stator 83. The thrust plate 82 is fixed on the rotating shaft 4, for example, the thrust plate 82 can be integrally formed on the rotating shaft 4. The casing 1 is also provided with a through hole 160 connected to the interior, and the rotating shaft 4 rotates in conjunction with the through hole 160.

[0048] Among them, such as Figure 3 As shown, the gap between the rotating shaft 4 and the through hole 160 forms an air inlet channel 161. A first heat dissipation channel is provided within the housing 1 and communicates with the air inlet channel 161. The first heat dissipation channel is used to draw air from the air inlet channel 161 and direct it through the thrust plate 82 to dissipate heat from the thrust plate 82.

[0049] In the above example, external air can enter the interior of the housing 1 through the air inlet duct 161. Specifically, the air can flow into the air inlet duct 161 driven by the external fan blades. The air inlet duct 161 formed between the rotating shaft 4 and the through hole 160 can assist in the air intake and increase the air intake volume. The first heat dissipation channel guides the air from the air inlet duct 161 to the thrust plate 82, thereby dissipating heat from the thrust plate 82, which helps to reduce the temperature of the thrust plate 82 and improve the cooling effect of the thrust plate 82.

[0050] like Figure 2 As shown, the housing 1 may be provided with a collector 18 , which is trumpet-shaped, and a large opening of the collector 18 serves as the aforementioned air blast port 10 .

[0051] In order to allow the wind of the first heat dissipation channel to flow through the thrust plate 82, in some embodiments, as shown in FIG. Figure 2 As shown, the aforementioned thrust plate 82 can be provided with an air hole structure 821 running through both axial ends, and the air hole structure 821 constitutes a part of the first heat dissipation channel, so that at least a part of the wind introduced into the first heat dissipation channel from the air inlet channel 161 flows through the thrust plate 82 through the air hole structure 821.

[0052] In the above example, by providing the air hole structure 821 passing through both axial ends of the thrust plate 82, the air can flow quickly from one axial side of the thrust plate 82 to the other side, thereby improving the air flow efficiency and achieving a better cooling effect of the thrust plate 82.

[0053] The air hole structure 821 is composed of at least one air hole that passes through both axial ends of the thrust plate 82 .

[0054] It should be noted here that: there is a first gap between the thrust disk 82 and the first axial stator 81, and a second gap between the thrust disk 82 and the second axial stator 83. A part of the wind in the first heat dissipation channel can also flow into the first gap from the gap between the first axial stator 81 and the rotating shaft 4, and then flow to the radial side of the thrust disk 82 through the first gap, and then flow into the gap between the second axial stator 83 and the rotating shaft 4 through the second gap, thereby achieving the effect of making the wind in the first heat dissipation channel flow through the thrust disk 82.

[0055] In some embodiments, the openings of the air vent structure 821 on both axial sides of the thrust plate 82 are respectively a first opening and a second opening. A first gap is defined between the first axial stator 81 and the rotating shaft 4, and the first opening is opposite to the first gap. A second gap is defined between the second axial stator 83 and the rotating shaft 4, and the second opening is opposite to the second gap.

[0056] In the above example, by making the openings at both ends of the air outlet structure 821 opposite to the first gap and the second gap respectively, it is further beneficial to allow the wind to flow quickly from one axial side of the thrust plate 82 to the other side, thereby further improving the air outlet efficiency and achieving a better cooling effect of the thrust plate 82.

[0057] In some embodiments, as Figure 2 As shown, the aforementioned rotating shaft 4 has a first section, a second section, and a third section connected in sequence along the axial direction. The rotating shaft 4 rotates with the through hole 160 through the first section, and the rotating shaft 4 is sleeved on the axial magnetic bearing 8 through the third section. The second section is sleeved with a bearing seat 17 and a first radial magnetic bearing 12 in sequence along the axial direction. The first radial magnetic bearing 12 is close to the axial magnetic bearing 8 relative to the bearing seat 17. Among them, the aforementioned first heat dissipation flow channel is used to allow the wind flowing out of the air inlet channel 161 to flow through the bearing seat 17 and the first radial magnetic bearing 12 in sequence, and then flow to the thrust plate 82.

[0058] In the above example, since the wind flowing out of the air inlet channel 161 flows through the bearing seat 17 and the first radial magnetic bearing 12 in sequence, and then flows to the thrust plate 82, the above-mentioned first heat dissipation channel is a series heat dissipation channel, which can save costs while ensuring the cooling effect.

[0059] The first radial magnetic bearing 12 is used to provide radial support for the rotating shaft 4. In some embodiments, Figure 2As shown, the first radial magnetic bearing 12 may include a first radial rotor 122 and a first radial stator 121 sleeved outside the first radial rotor 122. The first radial rotor 122 is sleeved on the rotating shaft 4. A gap channel is defined between the first radial rotor 122 and the first radial stator 121. The gap channel extends through both axial ends of the first radial magnetic bearing 12. This gap channel constitutes a portion of the aforementioned first heat dissipation channel.

[0060] In some embodiments, as Figure 2 As shown, the housing 1 may further include a second heat dissipation channel, which communicates with the air blast port 10. The second heat dissipation channel is used to draw air from the air blast port 10 and direct it through the second axial stator 83. The second axial stator 83 is located closer to the impeller 3 than the first axial stator 81.

[0061] In the above example, the airflow from the second heat dissipation channel can dissipate heat from the second axial stator 83 when passing through the second axial stator 83. The cooled second axial stator 83 can then cool the thrust plate 82. In this way, the airflow from the second heat dissipation channel can indirectly cool the thrust plate 82 through the second axial stator 83. The second heat dissipation channel, in conjunction with the aforementioned first heat dissipation channel, can enhance the heat dissipation and cooling effect of the thrust plate 82.

[0062] In order to achieve the effect of the wind flowing through the second axial stator 83 in the second heat dissipation channel, in a specific application example, as shown in FIG. Figure 2 As shown, the aforementioned second axial stator 83 has a first side 831 facing away from the first axial stator 81 , and the wind of the second heat dissipation channel is used to flow through the second axial stator 83 from the first side 831 .

[0063] In some embodiments, as Figure 2 As shown, the aforementioned second heat dissipation channel is used to allow air to flow through the motor assembly 6 to dissipate heat from the motor assembly 6, thereby cooling the motor assembly 6 and preventing the motor assembly 6 from malfunctioning due to excessive temperature.

[0064] In some embodiments, as Figure 2 As shown, the housing 1 is further provided with a support base 20 for supporting the impeller 3. The support base 20 is located between the impeller 3 and the motor assembly 6. The second heat dissipation channel is configured to allow air flowing from the air blast port 10 to flow sequentially through the support base 20 and the motor assembly 6 before reaching the second axial stator 83.

[0065] In the above example, since the wind flowing out of the air blast port 10 flows through the support seat 20 and the motor assembly 6 in sequence, and then flows to the second axial stator 83, the above-mentioned second heat dissipation channel is a series heat dissipation channel, which can save costs while ensuring the cooling effect.

[0066] In some embodiments, as Figure 2 As shown, the magnetic levitation blower of the present invention further includes a second radial magnetic bearing 13, which includes a second radial rotor 132 and a second radial stator 131 sleeved outside the second radial rotor 132. The second radial rotor 132 is sleeved on the rotating shaft 4. The second radial stator 131 is fixed to the support base 20. The second radial magnetic bearing 13 is used to provide radial support for the rotating shaft 4.

[0067] In some embodiments, the housing 1 further includes an air outlet channel, wherein the first heat dissipation channel and the second heat dissipation channel are used to converge inside the housing 1 and then guide the air out of the air outlet 2 through the air outlet channel. The air outlet channel is used to dissipate heat from the motor assembly 6.

[0068] In the above example, since the outlet flow channel can dissipate heat from the motor assembly 6, it can further dissipate heat and cool the motor assembly 6, preventing the motor assembly 6 from overheating and malfunctioning. Furthermore, since both the second heat dissipation channel and the outlet flow channel can dissipate heat from the motor assembly 6, the second heat dissipation channel and the outlet flow channel can cooperate to provide secondary heat dissipation for the motor assembly 6, thereby improving the heat dissipation effect of the motor assembly 6. Furthermore, since the first heat dissipation channel and the second heat dissipation channel share the same outlet flow channel, the structure of the outlet flow channel can be simplified, reducing costs.

[0069] In some embodiments, as Figure 2 As shown, a heat dissipation sleeve 5 is provided between the motor assembly 6 and the inner wall of the housing 1 to dissipate heat from the motor assembly 6. The heat dissipation sleeve 5 has heat dissipation holes 51 therein, which constitute part of the aforementioned air outlet flow path, allowing the air outlet flow path to dissipate heat from the motor assembly 6 through the heat dissipation sleeve 5.

[0070] In the above example, by introducing the wind from the air outlet duct into the heat dissipation sleeve 5, the wind can dissipate heat and cool the heat dissipation sleeve 5 when flowing through the heat dissipation sleeve 5, and then indirectly dissipate heat to the motor assembly 6 through the heat dissipation sleeve 5, so that the temperature of the motor assembly 6 is reduced.

[0071] In some embodiments, the heat dissipation sleeve 5 may be a metal sleeve, such as an aluminum sleeve, etc. The heat dissipation sleeve 5 made of metal is beneficial to heat dissipation of the motor assembly 6 .

[0072] In some embodiments, the aforementioned heat dissipation holes 51 may extend inside the heat dissipation sleeve 5 along the axial direction of the rotating shaft 4 to increase the contact area between the airflow and the heat dissipation sleeve 5 and improve the heat dissipation effect.

[0073] In order to achieve the effect of the intersection of the first heat dissipation channel and the second heat dissipation channel inside the housing 1, in some embodiments, as shown in FIG. Figure 2As shown, the aforementioned motor assembly 6 includes a stator 61 and a rotor 62, and the rotor 62 is fixedly connected to the rotating shaft 4. The stator 61 is used to drive the rotating shaft 4 to rotate by driving the rotor 62. The stator 61 includes a stator core 611 and a coil winding 612 disposed on the stator core. The motor assembly 6 is located between the second axial stator 83 and the blower impeller 3. A second airflow gap 832 is defined between the end of the stator 61 facing away from the blower impeller 3 and the aforementioned first side 831. The aforementioned first heat dissipation channel and the second heat dissipation channel intersect at this second airflow gap 832.

[0074] In the above example, when the first heat dissipation channel and the second heat dissipation channel intersect at the above-mentioned second air gap 832, a vortex will be formed, and the vortex will cause part of the air flow from the second heat dissipation channel to flow to the thrust disk 82, thereby further dissipating heat and cooling the thrust disk 82, so that the heat dissipation effect of the thrust disk 82 is better.

[0075] It should be noted here that: when the airflow in the first heat dissipation channel is too small, the airflow in the second heat dissipation channel can also flow to the thrust plate 82 through the gap between the second axial stator 83 and the rotating shaft 4, and then pass through the air outlet structure 821 on the thrust plate 82 to dissipate heat and cool the thrust plate 82.

[0076] In some embodiments, when a heat dissipation sleeve 5 is provided between the motor assembly 6 and the inner wall of the housing 1, the motor assembly 6 is sheathed within the heat dissipation sleeve 5 via the stator 61. The heat dissipation sleeve 5 is located between the second axial stator 83 and the impeller 3. The heat dissipation sleeve 5 has a second side and a third side in an axial direction that are opposite to each other. The second side is closer to the second axial stator 83 than the third side. The heat dissipation hole 51 has a first opening 512 on the second side. A gap is formed between the second side and the first side 831, so that the first opening 512 communicates with the second airflow gap 832.

[0077] In the above example, after the airflow of the first heat dissipation channel and the second heat dissipation channel intersect at the second air gap 832, they can enter the heat dissipation hole 51 from the first opening 512 to dissipate heat to the heat dissipation sleeve 5, and indirectly dissipate heat and cool the motor assembly 6 through the heat dissipation sleeve 5.

[0078] In some embodiments, as Figure 2 As shown, the aforementioned heat dissipation hole 51 can be a blind hole extending from the second side to the third side, and an air outlet 511 connected to the heat dissipation hole 51 is provided on the outer wall of the heat dissipation sleeve 5, and the air outlet channel is connected to the aforementioned air outlet 2 through the air outlet 511.

[0079] In the above example, since the heat dissipation hole 51 is a blind hole, the end of the heat dissipation hole 51 close to the third side is a closed end, for example, it can prevent the heat dissipation hole 51 and the second heat dissipation channel airflow on the side of the motor assembly 6 close to the blower impeller 3 from leaking gas.

[0080] In some embodiments, as Figure 2 As shown, when the thrust plate 82 is provided with an air hole structure 821 extending axially through both ends, the total opening area of ​​the air hole structure 821 at either axial end of the thrust plate 82 is St. The air hole structure 821 can be composed of at least one air hole extending axially through both ends of the thrust plate 82. The total opening area of ​​the air hole structure 821 at the first end (A) of the thrust plate 82 is the sum of the opening areas of the air holes at the first end (A). The first end (A) is either axial end of the thrust plate 82.

[0081] like Figure 2 As shown, the aforementioned motor assembly 6 includes a stator 61 and a rotor 62. The rotor 62 is fixedly connected to the rotating shaft 4. The stator 61 is used to drive the rotating shaft 4 to rotate by driving the rotor 62. The stator 61 includes a stator core 611 and a coil winding 612 disposed on the stator core. The gap between the stator 61 and the rotor 62 forms an air passage 19. This air passage 19 constitutes part of the aforementioned second heat dissipation flow channel. The cross-sectional area of ​​the air passage 19 at its narrowest point in a section perpendicular to the axial direction of the rotating shaft is Sq, and 0.6≤St / Sq≤0.8.

[0082] It should be noted here that: Figure 2 As shown, along the axial direction of the shaft 4, the gap between the stator 61 and the rotor 62 is larger at both ends and smaller in the middle. The narrowest part of the air passage 19 is located in the middle of the shaft axial direction.

[0083] In the above example, by making 0.6≤St / Sq≤0.8, it can be ensured that the thrust plate 82 has sufficient strength and heat dissipation gas can pass through, so that the magnetic levitation blower of the present invention has a better heat dissipation effect. Specifically, when the ratio of St / Sq exceeds 0.8, that is, St is too large or too small, or Sq is too large or too small. When St is too large, it will reduce performance and increase wind friction loss. When St is too small, it will affect the heat dissipation effect and cannot effectively reduce the temperature of the thrust plate 82. When Sq is too large, it is easy to reduce the efficiency of the motor; when Sq is too small, the flow rate flowing between the stator 6 and the rotor 62 becomes smaller, resulting in a worse heat dissipation effect.

[0084] In some embodiments, the opening area of ​​the tuyere 10 is S, wherein 0.12≤Sq / S≤0.21.

[0085] The cross-sectional area Sq of the narrowest part of the above-mentioned air passage 19 in the section perpendicular to the axis of the rotating shaft is sometimes also referred to as the air gap area. In the above example, when the inlet area S is constant, when the ratio of the air gap area Sq to the opening area S of the air blast port 10 is smaller, if Sq is smaller, the flow resistance in the air passage 19 increases, and the heat dissipation effect becomes worse. When the ratio of Sq to S is larger, if Sq is larger, that is, the gap between the stator 6 and the rotor 62 increases, resulting in a decrease in motor efficiency. Therefore, when 0.12≤Sq / S≤0.21, the motor efficiency and heat dissipation effect are optimal.

[0086] In some embodiments, as Figure 2 As shown, the housing 1 has a first end 101 and a second end 102 opposite to each other in the axial direction of the shaft 4, and a cylindrical section 103 located between the first end 101 and the second end 102. The outer radius of the cylindrical section 103 at any point in the axial direction of the shaft is Rt, and the inner radius is Rtn, where 1.05 ≤ Rt / Rtn ≤ 1.1.

[0087] In the above example, by setting 1.05 ≤ Rt / Rtn ≤ 1.1, the thickness of the cylindrical section 103 can be limited, preventing the excessive thickness of the housing 1 from causing poor heat dissipation of the motor assembly 6. Since heat is transferred between the cylindrical section 103, the airflow, the motor assembly 6, and the like when dissipating heat from the motor assembly 6, an excessively thick cylindrical section 103 can result in poor airflow heat dissipation.

[0088] In some embodiments, the total air inlet area of ​​the magnetic levitation blower of the present invention is S 总进 The total outlet area of ​​the magnetic levitation blower of this utility model is S 总出 , where 0.13≤S 总进 / S 总出 ≤0.22.

[0089] In the above example, by making 0.13≤S 总进 / S 总出 ≤0.22, can make the heat dissipation effect of the magnetic levitation blower of the utility model better. Specifically, when the ratio of the total air inlet area to the total air outlet area is smaller, the total air inlet area is larger or the total air outlet area is smaller. According to the relationship between the inlet flow rate, the inlet area and the inlet speed, when the total air inlet area is larger, the air inlet speed is smaller, and the heat dissipation effect decreases; and when the total air outlet area is smaller, it is difficult for the air flow to flow out from the air outlet 2, and it cannot take away the heat well, affecting the heat dissipation effect. Similarly, it can be seen that the larger the ratio of the total air inlet area to the total air outlet area, the same effect on the heat dissipation effect.

[0090] like Figure 3As shown, the aforementioned air inlet channel 161 has an annular air inlet at one end of the housing 1. In a specific application example, the air inlet of the magnetic levitation blower of the present invention only includes the annular air inlet and the aforementioned air blast port 10. The area of ​​the aforementioned air blast port 10 is S, and the area of ​​the annular air inlet is Sx. Therefore, S 总进 =S+Sx. The area of ​​the aforementioned air outlet 2 is Sc. The number of the aforementioned air outlet 2 can be more than two, and all are connected to the heat dissipation hole 51. Among them, the total air outlet area S of the magnetic levitation blower of the utility model is 总出 It is the sum of the areas of all air outlets 2.

[0091] It should be noted here that: Figure 2 As shown, the tuyere 10 is generally a circular tuyere, the radius of the tuyere 10 is R, and the area of ​​the tuyere 10 is S=Π*R 2 The air outlet 2 is generally a circular opening, the radius of the air outlet 2 is r1, and the area of ​​the air outlet 2 is Sc=Π*r1 2 The outer radius of the annular air inlet is r2, the inner diameter of the annular air inlet is r3, and the area of ​​the annular air inlet is Sx = Π*(r2-r3) 2 .

[0092] In some embodiments, the radius of the widest part of the through hole 160 is Rx, and the radius of the tuyere 10 is R. Wherein, 0.21≤Rx / R≤0.22.

[0093] In the above example, Rx / R is between 0.21 and 0.22 because when the Rx / R ratio is too large, that is, greater than 0.22, it may be that Rx is too large or the tuyere radius R is too small. A large Rx reduces the efficiency of the blower impeller 3. A small tuyere radius R will make the blower impeller 3 ineffective, resulting in a small amount of gas flow entering the blower. Conversely, when the Rx / R ratio is too small, that is, less than 0.21, when Rx is too small, the heat dissipation effect is not achieved, resulting in a small amount of gas flow entering the blower. A large tuyere radius R slows the gas flow rate and causes significant losses.

[0094] In some embodiments, as Figure 2 As shown, the housing 1 has a first end 101 and a second end 102 opposite each other in the axial direction of the rotating shaft 4. The housing 1 has a side surface located between the first end 101 and the second end 102, and the air outlet 2 is provided on the side surface. One of the aforementioned air blast port 10 and the air inlet passage 161 is located at the first end 101, and the other is located at the second end 102.

[0095] In the above example, the magnetic levitation blower of the present invention forms an axial air inlet at both ends and a radial air outlet. The air inlet and air outlet are arranged on different sides, which helps prevent wind from crossing.

[0096] In some embodiments, the distance between the end surface of the first end 101 and the end surface of the second end 102 of the housing is L, and the distance between the motor assembly 6 and the end surface of the first end 101 can be 1 / 4L to 1 / 2L. The distance between the axial magnetic bearing and the end surface of the first end 101 is 1 / 2L to 2 / 3L.

[0097] An embodiment of the present invention further provides a magnetic levitation compressor, which may include any of the aforementioned magnetic levitation blowers. Because the magnetic levitation compressor utilizes the aforementioned magnetic levitation blower, the air inlet channel 161 formed between the rotating shaft 4 and the through hole 160 can assist in air intake and increase the air intake volume. The first heat dissipation channel directs air from the air inlet channel 161 to the thrust plate 82, thereby dissipating heat from the thrust plate 82, thereby lowering the temperature of the thrust plate 82 and improving the cooling effect of the thrust plate 82.

[0098] In some embodiments, the magnetic levitation compressor of the present invention further includes a volute and an impeller. The volute has a compression chamber, and the impeller is rotatably disposed within the compression chamber. The impeller is configured to compress the gas within the compression chamber as it rotates. The impeller is located on the side of the casing 1 facing away from the tuyere 10. The rotating shaft 4 extends through the aforementioned through-hole 160 and is fixedly connected to the impeller so that the rotating shaft 4 can drive the impeller to rotate. The aforementioned through-hole 160 communicates with the compression chamber. The inner wall of the aforementioned through-hole 160 may be provided with a comb-tooth structure 16.

[0099] When the rotating shaft 4 drives the impeller to rotate, the impeller draws external air into the compression chamber for compression. Part of the gas can flow into the interior of the casing 1 through the air inlet channel 161, and then flow to the thrust plate 82 through the first heat dissipation channel to dissipate heat for the thrust plate 82.

[0100] In the above example, the comb structure 16 can control the amount of air flowing from the compression chamber into the air inlet channel 161 to prevent the amount of air flowing into the air inlet channel 161 from being too large and affecting the compression efficiency of the compressor.

[0101] In some embodiments, when the radius of the widest part of the via hole 160 is Rx, Figure 5 As shown, the comb structure 16 is uneven along the axial direction of the rotating shaft 4, and the widest part of the through hole 160 is located at the concave part of the comb structure. In other words, the radius of the groove of the comb structure is the aforementioned Rx.

[0102] For ease of understanding, the overall structure of the present invention is described below, and its working principle is explained.

[0103] In the existing magnetic levitation blower structure, the temperatures of various components are different, the internal temperature distribution is uneven, and the temperature difference is large, which affects the service life of the motor. In addition, the heat dissipation gas of the existing magnetic levitation blower is realized through the air gaps of the internal structures to achieve the heat dissipation function. The heat dissipation flow path is small, resulting in excessive pressure loss inside the motor. The magnetic levitation blower of the present invention, by adding an air inlet channel 161 and allowing the air flow of the air outlet flow path to pass through the motor assembly 6, has a more reasonable internal gas flow path. It can give full play to the cooling effect of the gas on the various components within the magnetic levitation blower of the present invention, thereby reducing the internal temperature difference of the magnetic levitation blower of the present invention and making the temperature field distribution more uniform. In addition, it can also play a role in reducing the internal pressure loss of the gas in the magnetic levitation blower of the present invention.

[0104] Among them, the magnetic levitation blower of the present invention can give full play to the cooling and heat dissipation effect of air. Without changing the rotation speed of the impeller 3, the overall air volume can be outputted in a large amount, and the temperature at the position of the thrust plate 82 can be reduced, so as to achieve the purpose of reducing the temperature of the whole machine, so that the blower has better performance and application value. Specifically, the magnetic levitation blower of the present invention takes in air at the same time through the air blast port 10 and the air inlet channel 161. The air blast port 10 relies on the rotation of the impeller 3 to inhale air, and the air inlet channel 161 obtains part of the air volume through leakage from the compression chamber. The cooperation between the air blast port 10 and the air inlet channel 161 increases the overall air intake volume of the present invention compared with the previous one. In addition, the airflows of the first heat dissipation channel and the second heat dissipation channel meet at the second axial stator 83, so that the airflows of the two can move repeatedly at the thrust plate 82, taking away more heat, thereby reducing the temperature at the thrust plate 82. Compared with the prior art, the number of air outlets 2 of the present invention is relatively small. Among them, the utility model can give full play to the cooling and heat dissipation effect of air while changing the air inlet volume and reducing the number of air outlets 2, thereby reducing the overall temperature.

[0105] like Figure 2As shown, the magnetic levitation blower of the present invention has two air inlets, namely the air vent 10 and the annular air inlet of the air inlet channel 161 on the casing 1. Among them, the air is mainly sucked in from the air vent 10. The external air flows from the air vent 10 through the collector 18 into the interior of the casing 1, and the air flow passes through the support seat 20. The gap between the stator 6 and the rotor 62 forms an air passage 19. The air flow flows through the air passage 19 to dissipate heat and cool the motor assembly 6, and the air flow takes away the heat; part of the air flow flowing out of the air passage 19 can flow to the thrust plate 82 to further reduce the temperature of the axial magnetic levitation bearing 8, and the other part can flow through the heat dissipation sleeve 5 and flow out from the air outlet 2. There is a comb tooth structure 16 on the inner wall of the aforementioned through hole 160, and part of the gas in the compression chamber leaks into the casing 1 from the air inlet channel 161. The airflow flowing into the casing 1 from the air inlet channel 161 flows through the bearing seat 17 and the first radial magnetic bearing 12 in sequence, and then flows through the first axial stator 81, the thrust plate 82 and the second axial stator 83 in sequence, further reducing the temperature at the axial magnetic bearing 8, and finally flows out from the air outlet 2 through the heat dissipation sleeve 5.

[0106] It is easy for those skilled in the art to understand that, under the premise of no conflict, the advantageous technical features of the above-mentioned methods can be freely combined and superimposed.

[0107] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principles of the present invention shall be included in the scope of protection of the present invention. The above description is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and variations can be made without departing from the technical principles of the present invention. Such improvements and variations shall also be considered within the scope of protection of the present invention.

Claims

1. A magnetic suspension blower, comprising a casing (1), a blast impeller (3), a rotating shaft (4), a motor assembly (6) and an axial magnetic suspension bearing (8), wherein the casing (1) is provided with an air blast port (10) and an air outlet (2), and the motor assembly (6) is used to drive the rotating shaft (4) to rotate, so that the rotating shaft (4) drives the blast impeller (3) to rotate, so that the blast impeller (3) drives the air flow to enter the air blast port (10); the axial magnetic suspension bearing (8) comprises a first axial stator (81), a second axial stator (83) and a thrust plate (82), wherein the thrust plate (82) is located between the first axial stator (81) and the second axial stator (83), and the thrust plate (82) is sleeved on the rotating shaft (4); the casing (1) is further provided with a through hole (160) communicating with the interior, and the rotating shaft (4) is rotatably matched with the through hole (160), characterized in that: The gap between the rotating shaft (4) and the through hole (160) forms an air inlet channel (161), and the housing (1) has a first heat dissipation channel, which is connected to the air inlet channel (161); the first heat dissipation channel is used to introduce wind from the air inlet channel (161) and allow the wind to flow through the thrust disk (82) to dissipate heat from the thrust disk (82).

2. The magnetic levitation blower according to claim 1, characterized in that: The thrust plate (82) is provided with an air hole structure (821) running through both axial ends. The air hole structure (821) constitutes a part of the first heat dissipation channel, so that at least a part of the wind introduced into the first heat dissipation channel from the air inlet channel (161) flows through the thrust plate (82) through the air hole structure (821).

3. The magnetic levitation blower according to claim 1 or 2, characterized in that: The rotating shaft (4) has a first section, a second section, and a third section connected in sequence along the axial direction; the rotating shaft (4) is rotatably engaged with the through hole (160) through the first section, and the rotating shaft (4) is sleeved on the axial magnetic suspension bearing (8) through the third section; a bearing seat (17) and a first radial magnetic suspension bearing (12) are sleeved in sequence on the second section along the axial direction; the first radial magnetic suspension bearing (12) is close to the axial magnetic suspension bearing (8) relative to the bearing seat (17); The first heat dissipation channel is used to allow the wind flowing out of the air inlet channel (161) to flow through the bearing seat (17) and the first radial magnetic bearing (12) in sequence, and then flow to the thrust plate (82).

4. The magnetic levitation blower according to claim 1 or 2, characterized in that: The housing (1) further comprises a second heat dissipation channel, the second heat dissipation channel being in communication with the blast port (10), the second heat dissipation channel being used to introduce wind from the blast port (10) and allowing the wind to flow through the second axial stator (83); the second axial stator (83) is closer to the blast impeller (3) relative to the first axial stator (81).

5. The magnetic levitation blower according to claim 4, characterized in that: The second axial stator (83) has a first side (831) facing away from the first axial stator (81), and the wind of the second heat dissipation channel is used to flow through the second axial stator (83) from the first side (831).

6. The magnetic levitation blower according to claim 4, characterized in that: The second heat dissipation channel is used to allow wind to flow through the motor assembly (6) to dissipate heat from the motor assembly (6).

7. The magnetic levitation blower according to claim 4, characterized in that: The housing (1) further comprises an air outlet channel, wherein the first heat dissipation channel and the second heat dissipation channel are used to guide the air out of the air outlet (2) through the air outlet channel after the air meets inside the housing (1), wherein the air outlet channel is used to dissipate heat from the motor assembly (6).

8. The magnetic levitation blower according to claim 7, characterized in that: A heat dissipation sleeve (5) is provided between the motor assembly (6) and the inner wall of the housing (1), and the heat dissipation sleeve (5) is used to dissipate heat from the motor assembly (6); The heat dissipation sleeve (5) has heat dissipation holes (51) inside, and the heat dissipation holes (51) constitute a part of the air outlet flow channel, so that the air outlet flow channel dissipates heat from the motor assembly (6) through the heat dissipation sleeve (5).

9. The magnetic levitation blower according to claim 7 or 8, characterized in that: When the second axial stator (83) has a first side (831) facing away from the first axial stator (81), and the wind of the second heat dissipation channel is used to flow through the second axial stator (83) from the first side (831), The motor assembly (6) includes a stator (61) and a rotor (62), wherein the rotor (62) is fixedly connected to the rotating shaft (4), and the stator (61) is used to drive the rotating shaft (4) to rotate by driving the rotor (62); The motor assembly (6) is located between the second axial stator (83) and the blower impeller (3); a second air gap (832) is provided between the end of the stator (61) facing away from the blower impeller (3) and the first side (831); and the first heat dissipation channel and the second heat dissipation channel meet at the second air gap (832).

10. The magnetic levitation blower according to claim 9, characterized in that: When a heat dissipation sleeve (5) is provided between the motor assembly (6) and the inner wall of the housing (1), and the heat dissipation sleeve (5) is used to dissipate heat from the motor assembly (6); the heat dissipation sleeve (5) has a heat dissipation hole (51) inside, and the heat dissipation hole (51) constitutes a part of the air outlet flow channel, so that the air outlet flow channel dissipates heat from the motor assembly (6) through the heat dissipation sleeve (5), the motor assembly (6) is sleeved in the heat dissipation sleeve (5) through the stator (61), the heat dissipation sleeve (5) is located between the second axial stator (83) and the blower impeller (3), the heat dissipation sleeve (5) has a second side and a third side opposite to each other along the axial direction, the second side is close to the second axial stator (83) relative to the third side, and the heat dissipation hole (51) has a first opening (512) on the second side; There is a gap between the second side and the first side (831), so that the first opening (512) is connected to the second air outlet gap (832).

11. The magnetic levitation blower according to claim 10, characterized in that: The heat dissipation hole (51) is a blind hole extending from the second side to the third side; an air outlet (511) communicating with the heat dissipation hole (51) is provided on the outer wall of the heat dissipation sleeve (5); and the air outlet flow channel is communicated with the air outlet (2) through the air outlet (511).

12. The magnetic levitation blower according to claim 4, characterized in that: When the thrust disc (82) is provided with an air hole structure (821) that passes through both axial ends, the total opening area of ​​the air hole structure (821) at either end of the thrust disc (82) is St; The motor assembly (6) includes a stator (61) and a rotor (62), wherein the rotor (62) is fixedly connected to the rotating shaft (4), and the stator (61) is used to drive the rotating shaft (4) to rotate by driving the rotor (62); a gap between the stator (61) and the rotor (62) forms an air passage (19), and the air passage (19) constitutes a part of the second heat dissipation channel; wherein the cross-sectional area of ​​the narrowest part of the air passage (19) in a cross section perpendicular to the axial direction of the rotating shaft is Sq, and 0.6≤St / Sq≤0.

8.

13. The magnetic levitation blower according to claim 4, characterized in that: The motor assembly (6) includes a stator (61) and a rotor (62), wherein the rotor (62) is fixedly connected to the rotating shaft (4), and the stator (61) is used to drive the rotating shaft (4) to rotate by driving the rotor (62); a gap between the stator (61) and the rotor (62) forms an air passage (19), and the air passage (19) constitutes a part of the second heat dissipation channel; wherein the cross-sectional area of ​​the air passage (19) at its narrowest point in a cross section perpendicular to the axial direction of the rotating shaft is Sq; the opening area of ​​the air blast port (10) is S; wherein 0.12≤Sq / S≤0.

21.

14. The magnetic levitation blower according to any one of claims 1, 2, 5 to 8, and 10 to 12, characterized in that: In the axial direction of the rotating shaft (4), the housing (1) has a first end (101) and a second end (102) opposite to each other, and the housing (1) has a cylindrical section (103) located between the first end (101) and the second end (102). The outer radius of the cylindrical section (103) at any point in the axial direction of the rotating shaft (4) is Rt, and the inner radius is Rtn, and 1.05≤Rt / Rtn≤1.

1.

15. The magnetic levitation blower according to any one of claims 1, 2, 5 to 8, and 10 to 12, characterized in that: The total air inlet area of ​​the magnetic levitation blower is S 总进 The total outlet area (2) of the magnetic levitation blower is S 总出 , where 0.13≤S 总进 / S 总出 ≤0.

22.

16. The magnetic levitation blower according to any one of claims 1, 2, 5 to 8, and 10 to 12, characterized in that: The radius of the widest part of the through hole (160) is Rx, and the radius of the blast port (10) is R, wherein 0.21≤Rx / R≤0.

22.

17. The magnetic levitation blower according to any one of claims 1, 2, 5 to 8, and 10 to 12, characterized in that: In the axial direction along the rotating shaft (4), the housing (1) has a first end (101) and a second end (102) opposite to each other, the housing (1) has a side surface located between the first end (101) and the second end (102), and the air outlet (2) is arranged on the side surface; One of the air blast port (10) and the air inlet channel (161) is located at the first end (101), and the other is located at the second end (102).

18. A magnetic levitation compressor, characterized in that: The invention comprises the magnetic levitation blower according to any one of claims 1 to 17.

19. The magnetic levitation compressor according to claim 18, characterized in that: It also includes a volute and an impeller, the volute having a compression chamber, the impeller being rotatably disposed in the compression chamber, and the impeller being used to compress the gas in the compression chamber when rotating; the impeller being located on a side of the housing (1) away from the blast port (10), the rotating shaft (4) extending out of the through hole (160), and the rotating shaft (4) being fixedly connected to the impeller so that the rotating shaft (4) can drive the impeller to rotate; The through hole (160) is in communication with the compression chamber, wherein a comb tooth structure (16) is provided on the inner wall of the through hole (160).

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