Motor bearing cooling structure and compressor

Abstract

The invention provides a motor bearing cooling structure and a compressor, the motor bearing cooling structure comprises a rotor, the rotor is sleeved with a stator, the rotor is sleeved with a first bearing, the first bearing and the stator are sequentially arranged in the axial direction of the rotor, the rotor is provided with a first cavity, and the first cavity is provided with a second cavity; at least part of the first cavity is opposite to the first bearing, the rotor is provided with a plurality of first through holes and a plurality of second through holes, the first through holes are opposite to the first bearing, the second through holes are located between the first bearing and the stator, and the first through holes are communicated with the second through holes. The first through hole and the second through hole are communicated with the first cavity, and air flow flows into the first cavity through the second through hole and then flows out of the first through hole so as to conduct heat exchange on the first bearing. According to the water vapor compressor, the technical problem that in the prior art, a water vapor compressor cannot effectively cool a motor bearing, and consequently the bearing is prone to being damaged can be solved.

Description

Technical Field

[0001] The present invention belongs to the technical field of compressors, and in particular relates to a motor bearing cooling structure and a compressor. Background Art

[0002] Conventional water vapor compressors provide cooling gas through a fan, and the gas flows from the fan to the rotor. Since the gap between the bearing and the rotor is very small, about 20 threads, and the pressure difference between the motor cavity and the outside of the support is very small, only a small part of the gas will flow to the gap between the bearing and the rotor 1 to cool the bearing. Most of the gas will flow from the gap between the stator and the rotor to the secondary bearing side to cool the stator, and then flow from the secondary bearing side to the surface cooler. The surface cooler cools the flowing gas, and then the fan supplies air to the motor cavity to form an internal circulation cooling system. At present, this method can effectively cool the motor stator and rotor, but the cooling effect on the bearing is very poor.

[0003] For a steam compressor, during the startup of the motor rotor, dry friction will occur between the rotor and the bearing, generating a large amount of heat. The bearings and rotor will expand due to the heat. If the bearings and rotor are not cooled in time, the rotor and bearings will lock, thereby damaging the bearings.

[0004] Since the water vapor compressor in the prior art has a very poor cooling effect on the bearings, when the motor rotor starts, dry friction will occur between the rotor and the bearings, and the bearings and rotor will expand due to heat, leading to technical problems such as bearing damage. Therefore, the present invention studies and designs a motor bearing cooling structure and compressor. Summary of the Invention

[0005] Therefore, the present invention provides a motor bearing cooling structure and a compressor, which can solve the technical problem in the prior art that the steam compressor cannot effectively cool the motor bearings, resulting in easy damage to the bearings.

[0006] In order to solve the above problems, the present invention provides a motor bearing cooling structure, including: a rotor, the rotor is sleeved in a stator, the rotor is sleeved with a first bearing, the first bearing and the stator are arranged in sequence along the axial direction of the rotor, the rotor has a first chamber, the first chamber is at least partially opposite to the first bearing, a plurality of first through holes and a plurality of second through holes are provided on the rotor, the first through holes are arranged opposite to the first bearing, the second through holes are located between the first bearing and the stator, and the first through holes and the second through holes are connected to the first chamber, and the air flow flows into the first chamber through the second through holes and then flows out from the first through holes to exchange heat with the first bearing.

[0007] In some embodiments, the rotor is provided with a second bearing, the stator is located between the second bearing and the first bearing, the rotor has a second chamber, the second chamber (10) is at least partially opposite to the second bearing, the rotor is provided with a plurality of third through holes and a plurality of fourth through holes, the fourth through holes are arranged opposite to the second bearing, the third through holes are arranged opposite to the windings of the stator, the third through holes and the fourth through holes are connected to the second chamber, and the airflow flows through the gap between the rotor and the stator, flows into the second chamber through the third through holes, and then flows out from the fourth through holes to perform heat exchange on the second bearing.

[0008] In some embodiments, the plurality of first through-holes, the plurality of second through-holes, the plurality of third through-holes, and the plurality of fourth through-holes are spaced apart along the circumferential direction of the rotor.

[0009] In some embodiments, the rotor includes a magnet located between the first cavity and the second cavity.

[0010] In some embodiments, the rotor includes a first section, a second section, and a third section, the outer diameter of the second section is larger than the outer diameters of the first section and the third section, and the outer diameters of the first section and the third section are the same.

[0011] In some embodiments, the magnetic steel is located in the second section, and the first chamber and the second chamber are at least partially located in the second section, the first through hole is located in the first section, the second through hole and the third through hole are located in the second section, and the fourth through hole is located in the third section.

[0012] In some embodiments, a bearing sleeve is provided between the first bearing and the rotor and between the second bearing and the rotor, and a plurality of grooves are provided on the inner wall of the bearing sleeve. The grooves extend along the axial direction of the rotor and pass through the bearing sleeve. The fourth through hole is connected to the groove at the second bearing, and the second through hole is connected to the groove at the first bearing.

[0013] In some embodiments, a plurality of the grooves are spaced apart along the circumference of the bearing sleeve.

[0014] In some embodiments, one end of the bearing sleeve abuts against an end surface of the second section, and the thickness of the bearing sleeve and the difference in outer diameters of the second section and the first section are the same.

[0015] The present invention also provides a compressor, which includes the above-mentioned motor bearing cooling structure.

[0016] The motor bearing cooling structure and compressor provided by the present invention have the following beneficial effects:

[0017] Through the second through hole, the first chamber and the first through hole, the air flow can flow into the first chamber through the second through hole and then flow out from the first through hole to exchange heat with the first bearing, thereby solving the problem in the prior art that the air flow cannot effectively cool the bearing due to the small gap between the bearing and the rotor. In addition, the first chamber can also reduce the weight of the rotor, reduce the load on the bearing, and further improve the reliability of the motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] To more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for the embodiments or the description of the prior art. The drawings described below are merely exemplary. Those skilled in the art can, without inventive effort, derive other implementation drawings based on the provided drawings.

[0019] Figure 1 is an assembly diagram of the motor bearing cooling structure of the present invention;

[0020] Figure 2 yes Figure 1 A partial enlarged view of the first bearing in the middle;

[0021] Figure 3 yes Figure 2 A partial enlarged view of the second bearing;

[0022] Figure 4 This is a schematic diagram of the structure of the bearing sleeve in the motor bearing cooling structure of the present invention. Figure 1 ;

[0023] Figure 5 This is a schematic diagram of the structure of the bearing sleeve in the motor bearing cooling structure of the present invention. Figure 2 ;

[0024] Figure 6 Schematic diagram of the structure of the rotor in the motor bearing cooling structure of the present invention;

[0025] Figure 7 It is a structural schematic diagram of a compressor according to another embodiment of the present invention.

[0026] The accompanying drawings are:

[0027] 1. Rotor; 2. Stator; 3. Bearing sleeve; 4. First bearing; 5. Fan; 6. Surface cooler; 7. Second bearing; 8. Magnet; 9. First chamber; 10. Second chamber; 11. Groove; 12. First through hole; 13. Second through hole; 14. Third through hole; 15. Fourth through hole. DETAILED DESCRIPTION

[0028] The following will be combined with the accompanying 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 part of the embodiments of the present invention, rather than all the 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.

[0029] In the description of the present invention, it should be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "horizontal, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the accompanying 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.

[0030] 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.

[0031] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the present invention.

[0032] See also Figure 1-7As shown, according to an embodiment of the present invention, a motor bearing cooling structure is provided, including: a rotor 1, the rotor 1 is sleeved in a stator 2, a first bearing 4 is sleeved on the rotor 1, the first bearing 4 and the stator 2 are arranged in sequence along the axial direction of the rotor 1, the rotor 1 has a first chamber 9, the first chamber 9 is at least partially opposite to the first bearing 4, a plurality of first through holes 12 and a plurality of second through holes 13 are provided on the rotor 1, the first through holes 12 are arranged opposite to the first bearing 4, the second through holes 13 are located between the first bearing 4 and the stator 2, and the first through holes 12 and the second through holes 13 are connected to the first chamber 9, and the air flow flows into the first chamber 9 through the second through holes 13 and then flows out from the first through holes 12 to exchange heat with the first bearing 4.

[0033] In this technical solution, through the second through hole 13, the first chamber 9 and the first through hole 12, the air flow can flow into the first chamber 9 through the second through hole 13 and then flow out from the first through hole 12 to exchange heat with the first bearing 4, thereby solving the problem in the prior art that the air flow cannot effectively cool the bearing due to the small gap between the bearing and the rotor 1. In addition, the first chamber 9 can also reduce the weight of the rotor, reduce the load on the bearing, and further improve the reliability of the motor.

[0034] In some embodiments, the rotor 1 is provided with a second bearing 7, the stator 2 is located between the second bearing 7 and the first bearing 4, the rotor 1 has a second chamber 10, the second chamber 10 is at least partially opposite to the second bearing 7, the rotor 1 is provided with a plurality of third through holes 14 and a plurality of fourth through holes 15, the fourth through holes 15 are arranged opposite to the second bearing 7, the third through holes 14 are arranged opposite to the windings of the stator 2, the third through holes 14 and the fourth through holes 15 are connected to the second chamber 10, and the air flow flows through the gap between the rotor 1 and the stator 2, flows into the second chamber 10 through the third through holes 14, and then flows out from the fourth through holes 15 to exchange heat with the second bearing 7.

[0035] In this technical solution, dry friction exists between the rotor 1 and the bearings during startup, and the rotor 1 does not fully float until it reaches its critical speed. From startup to critical speed, the rotor 1 and the bearings are in a state of dry friction, generating a significant amount of heat. This heat causes the rotor 1 and bearings to heat up and expand. If they are not cooled promptly, they can lock. In the water vapor compressor, the parts of the rotor 1 located on both sides of the stator 2 are provided with bearings, which are connected to the support through the bearings. The motor bearing cooling structure of the present invention exchanges heat with the first bearing 4 on one side of the rotor 1 through the second through hole 13, the first chamber 9 and the first through hole 12. When the air flow enters the shell through the third through hole 14, the second chamber 10 and the fourth through hole 15, a part of the air flow can flow into the first chamber 9 through the second through hole 13 and then flow out from the first through hole 12 to exchange heat with the first bearing 4. The other part of the air flow flows through the gap between the rotor 1 and the stator 2, flows into the second chamber 10 through the third through hole 14, and then flows out from the fourth through hole 15 to exchange heat with the second bearing 7. It can not only cool the motor stator and rotor, but also effectively cool the bearings. At the same time, the first chamber 9 and the second chamber 10 can also reduce the weight of the rotor, reduce the load on the bearing, and further improve the reliability of the motor.

[0036] In some embodiments, a plurality of the first through holes 12 , a plurality of the second through holes 13 , a plurality of the third through holes 14 , and a plurality of the fourth through holes 15 are arranged at intervals along the circumferential direction of the rotor 1 .

[0037] In this technical solution, multiple first through holes 12, multiple second through holes 13, multiple third through holes 14, and multiple fourth through holes 15 are arranged at intervals along the circumference of the rotor 1, increasing the air inlet area and the air outlet area of ​​the first chamber 9 and the second chamber 10, increasing the heat exchange area of ​​the first bearing 4 and the second bearing 7, and improving the heat exchange efficiency.

[0038] In some embodiments, the rotor 1 includes a magnet 8 , and the magnet 8 is located between the first cavity 9 and the second cavity 10 .

[0039] In this technical solution, the magnetic steel 8 is located between the first chamber 9 and the second chamber 10. While ensuring the reliability of the rotor 1, the structure of the rotor 1 is fully utilized, the weight of the rotor is effectively reduced, and the stability of the rotor is improved.

[0040] In some embodiments, the rotor 1 includes a first section, a second section, and a third section, the outer diameter of the second section is larger than the outer diameters of the first section and the third section, and the outer diameters of the first section and the third section are the same.

[0041] In this technical solution, the rotor 1 adopts a three-section structure, which effectively disperses the stress generated by the rotor during high-speed rotation, improves the mechanical strength and stability of the rotor, and reduces the risk of breakage and deformation.

[0042] In some embodiments, the magnetic steel 8 is located in the second section, and the first chamber 9 and the second chamber 10 are at least partially located in the second section, the first through hole 12 is located in the first section, the second through hole 13 and the third through hole 14 are located in the second section, and the fourth through hole 15 is located in the third section.

[0043] In this technical solution, the second section has an annular groove, the channel steel 8 is located in the annular groove, and the outer surface of the channel steel 8 and the bottom of the annular groove are located on the same circumferential surface. An annular sleeve is provided in the annular groove, and the thickness of the annular sleeve matches the depth of the annular groove, so that the magnet is connected to the second section through the sleeve.

[0044] In some embodiments, a bearing sleeve 3 is provided between the first bearing 4 and the rotor 1 and between the second bearing 7 and the rotor 1. The inner wall of the bearing sleeve 3 is provided with a plurality of grooves 11. The grooves 11 extend along the axial direction of the rotor 1 and pass through the bearing sleeve 3. The fourth through hole 15 is connected to the groove 11 at the second bearing 7, and the second through hole 12 is connected to the groove 11 at the first bearing 4.

[0045] In this technical solution, since the first through hole 12, the second through hole 13, the third through hole 14, and the fourth through hole 15 need to be drilled by a drill during processing, hole edges will be generated after drilling. During high-speed operation, the hole edges will easily scratch the bearings. Therefore, a bearing sleeve 3 is provided to prevent the bearings from being scratched by the hole edges. Through the groove 3, an air flow circulates in the groove 3, and the gas cools the bearing sleeve 3. The bearing sleeve 3 exchanges heat with the bearing, thereby cooling the bearing.

[0046] In some embodiments, a plurality of grooves 11 are arranged at intervals along the circumference of the bearing sleeve 3 .

[0047] In this technical solution, the grooves 11 are arranged at intervals along the circumference of the bearing sleeve 3 to increase the heat exchange area of ​​the bearing sleeve 3 and improve the heat exchange efficiency between the bearing sleeve 3 and the airflow, thereby reducing the temperature of the motor bearing and preventing the rotor and bearing from locking and damaging the bearing.

[0048] In the motor bearing cooling structure of the present invention, the interior of the rotor 1 is hollowed out. The rotor 1 is made of titanium alloy, which not only ensures the strength of the rotor 1 after hollowing, but also effectively reduces the weight of the rotor and reduces the load on the bearing 4. Eight holes are drilled on both sides of the rotor 1. Since the edges of the holes can easily scratch the bearings during high-speed operation of the rotor after drilling, a bearing sleeve 3 is required at the bearing position of the rotor 1. Part of the gas flows from the fan 5 to the second through hole 13, flows into the first chamber 9 through the second through hole 13, flows into the groove 11 from the first through hole 12, and flows to the outside of the first support through the groove 11 of the bearing sleeve 3 to be discharged, cooling the first bearing 4. Another part of the airflow flows through the gap between the rotor 1 and the stator 2, flows into the second chamber 10 through the third through hole 14, flows into the groove 11 from the fourth through hole 15, and flows to the outside of the second support through the groove 11 of the bearing sleeve 3 to be discharged, cooling the second bearing 7. After flowing out of the compressor, the airflow flows through the surface cooler 6 and then flows to the fan 5. It can not only cool the stator and rotor of the motor, but also effectively cool the bearings. At the same time, the reduced weight of the rotor 1 reduces the load on the bearings and increases the reliability of the stable operation of the compressor.

[0049] In some embodiments, one end of the bearing sleeve 3 abuts against the end surface of the second section, and the thickness of the bearing sleeve 3 and the difference in outer diameter between the second section and the first section are the same.

[0050] In this technical solution, the thickness of the bearing sleeve 3 and the difference in outer diameter between the second section and the first section are the same, so that the bearing model remains unchanged and the bearing can be prevented from being scratched by the edge of the hole. In addition, one end of the bearing sleeve 3 abuts against the end face of the second section, which can also ensure a stable connection between the bearing sleeve 3 and the rotor 1.

[0051] The present invention also provides a compressor comprising the above-mentioned motor bearing cooling structure.

[0052] In this technical solution, the compressor of the present invention is preferably a water vapor compressor, which also includes a fan 5 and a surface cooler 6. The air flow enters the compressor through the fan 5, and a part of the air flow flows into the first chamber 9 through the second through hole 13, and then flows out from the first through hole 12 to exchange heat with the first bearing 4. The other part of the air flow flows through the gap between the rotor 1 and the stator 2, flows into the second chamber 10 through the third through hole 14, and then flows out from the fourth through hole 15 to exchange heat with the second bearing 7. After flowing out of the compressor, the air flow flows through the surface cooler 6 and then flows to the fan 5.

[0053] 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.

[0054] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention. The above description is merely a preferred embodiment of the present invention. It should be noted that those skilled in the art can make various improvements and variations without departing from the technical principles of the present invention, and such improvements and variations shall also be considered within the scope of protection of the present invention.

Claims

1. A motor bearing cooling structure, characterized in that: include: A rotor (1) is provided, wherein the rotor (1) is sleeved in a stator (2), a first bearing (4) is sleeved on the rotor (1), the first bearing (4) and the stator (2) are arranged in sequence along the axial direction of the rotor (1), the rotor (1) has a first chamber (9), the first chamber (9) is at least partially opposite to the first bearing (4), a plurality of first through holes (12) and a plurality of second through holes (13) are provided on the rotor (1), the first through holes (12) are arranged opposite to the first bearing (4), the second through holes (13) are located between the first bearing (4) and the stator (2), and the first through holes (12) and the second through holes (13) are connected to the first chamber (9), and air flows into the first chamber (9) through the second through holes (13) and then flows out from the first through holes (12) to perform heat exchange on the first bearing (4).

2. The motor bearing cooling structure according to claim 1, characterized in that: The rotor (1) is provided with a second bearing (7), the stator (2) is located between the second bearing (7) and the first bearing (4), the rotor (1) has a second chamber (10), the second chamber (10) is at least partially opposite to the second bearing (7), the rotor (1) is provided with a plurality of third through holes (14) and a plurality of fourth through holes (15), the fourth through holes (15) are arranged opposite to the second bearing (7), the third through holes (14) are arranged opposite to the winding of the stator (2), the third through holes (14) and the fourth through holes (15) are connected to the second chamber (10), and the airflow flows through the gap between the rotor (1) and the stator (2), flows into the second chamber (10) through the third through holes (14), and then flows out from the fourth through holes (15) to perform heat exchange on the second bearing (7).

3. The motor bearing cooling structure according to claim 2, characterized in that: A plurality of the first through holes (12), a plurality of the second through holes (13), a plurality of the third through holes (14), and a plurality of the fourth through holes (15) are arranged at intervals along the circumferential direction of the rotor (1).

4. The motor bearing cooling structure according to claim 2, characterized in that: The rotor (1) comprises a magnetic steel (8), and the magnetic steel (8) is located between the first chamber (9) and the second chamber (10).

5. The motor bearing cooling structure according to claim 4, characterized in that: The rotor (1) comprises a first section, a second section and a third section, the outer diameter of the second section is larger than the outer diameters of the first section and the third section, and the outer diameters of the first section and the third section are the same.

6. The motor bearing cooling structure according to claim 5, characterized in that: The magnetic steel (8) is located in the second section, and the first chamber (9) and the second chamber (10) are at least partially located in the second section, the first through hole (12) is located in the first section, the second through hole (13) and the third through hole (14) are located in the second section, and the fourth through hole (15) is located in the third section.

7. The motor bearing cooling structure according to claim 5, characterized in that: A bearing sleeve (3) is provided between the first bearing (4) and the rotor (1), and between the second bearing (7) and the rotor (1); a plurality of grooves (11) are provided on the inner wall of the bearing sleeve (3); the grooves (11) extend along the axial direction of the rotor (1) and pass through the bearing sleeve (3); the fourth through hole (15) is connected to the groove (11) at the second bearing (7); and the second through hole (12) is connected to the groove (11) at the first bearing (4).

8. The motor bearing cooling structure according to claim 7, characterized in that: A plurality of grooves (11) are arranged at intervals along the circumference of the bearing sleeve (3).

9. The motor bearing cooling structure according to claim 7, characterized in that: One end of the bearing sleeve (3) abuts against the end surface of the second section, and the thickness of the bearing sleeve (3) and the difference in outer diameters of the second section and the first section are the same.

10. A compressor, characterized in that: The motor bearing cooling structure comprises the motor bearing cooling structure according to any one of claims 1 to 9.

Images