Air compressors, air conditioners and automobiles

Abstract

The present disclosure relates to the technical field of air compression equipment, and in particular to an air compressor. The air compressor includes: a housing, in which a motor cavity is provided; a motor, which is arranged in the motor cavity and includes a stator and a rotor, and the rotor passes through the stator; a radial bearing, which is arranged on the rotor; and an air cooling structure, including a cooling air inlet, a cooling air outlet and a bearing air cooling flow channel, the cooling air inlet and the cooling air outlet are both arranged on the housing, and the bearing air cooling flow channel is arranged on the radial bearing and is connected with the cooling air inlet and the cooling air outlet. Based on this, the cooling effect of the radial bearing in the air compressor can be improved.

Description

Technical Field

[0001] The present disclosure relates to the technical field of air compression equipment, and in particular to an air compressor, an air conditioner and a car. Background Art

[0002] An air compressor is a mechanical device that compresses atmospheric pressure air and turns it into high-pressure gas for use in gas-using equipment. The speed of an air compressor is generally high, which will generate a lot of heat. This heat will affect the life of the stator, rotor, and bearings in the air compressor, and thus affect the performance of the air compressor.

[0003] In the related art, the cooling effect of the radial bearing in the air compressor needs to be improved. Summary of the invention

[0004] A technical problem to be solved by the present disclosure is to improve the cooling effect of radial bearings in air compressors.

[0005] In order to solve the above technical problems, the present disclosure provides an air compressor, which includes:

[0006] A housing having a motor cavity therein;

[0007] A motor is disposed in the motor cavity and includes a stator and a rotor, wherein the rotor passes through the stator;

[0008] a radial bearing disposed on the rotor; and

[0009] The air cooling structure includes a cooling air inlet, a cooling air outlet and a bearing air cooling channel. The cooling air inlet and the cooling air outlet are both arranged on the shell. The bearing air cooling channel is arranged on the radial bearing and is connected with the cooling air inlet and the cooling air outlet.

[0010] In some embodiments, the air compressor includes at least two radial bearings, and the at least two radial bearings include a first radial bearing and a second radial bearing. The first radial bearing and the second radial bearing are located on both sides of the axial direction of the stator and are arranged sequentially along the direction from the cooling air inlet to the cooling air outlet. The bearing air cooling flow channel includes a first bearing flow channel and a second bearing flow channel. The first bearing flow channel is arranged on the first radial bearing, and the second bearing flow channel is arranged on the second radial bearing. The first bearing flow channel and the second bearing flow channel are both connected to the motor cavity.

[0011] In some embodiments, the first bearing flow channel includes a first radial flow channel and a first axial flow channel, the first radial flow channel extends along the radial direction of the rotor, the first axial flow channel extends along the axial direction of the rotor, the first radial flow channel is connected to the cooling air inlet and is connected to the motor cavity through the first axial flow channel; and / or, the second bearing flow channel includes a second axial flow channel and a second radial flow channel, the second axial flow channel extends along the axial direction of the rotor, the second radial flow channel extends along the radial direction of the rotor, the second axial flow channel is connected to the motor cavity and is connected to the cooling air outlet through the second radial flow channel.

[0012] In some embodiments, the air compressor includes an axial bearing, which is arranged in the housing and located on the side of the second radial bearing away from the first radial bearing. The second bearing flow channel is connected to the cooling air outlet through the space where the axial bearing is located, so that the cooling air flowing out of the second bearing flow channel flows through the axial bearing in the process of flowing to the cooling air outlet, thereby cooling the axial bearing.

[0013] In some embodiments, the air compressor includes a bearing seat, the bearing seat supports the radial bearing, and a connecting flow channel is provided on the bearing seat. The cooling air inlet and / or the cooling air outlet are connected to the bearing air cooling flow channel through the connecting flow channel.

[0014] In some embodiments, the bearing air cooling channel is disposed on the bearing shell of the radial bearing.

[0015] In some embodiments, the air cooling structure includes a buffer cavity, which is located in the shell and connected to the cooling air inlet and the bearing air cooling flow channel.

[0016] In some embodiments, the buffer cavity is connected to the cooling air inlet and the motor cavity.

[0017] In some embodiments, the air cooling structure includes a baffle, which is disposed in the shell and closes the opening of the cache cavity toward the motor cavity. A vent is provided on the baffle, and the cache cavity is connected to the motor cavity through the vent.

[0018] In some embodiments, a plurality of vents are disposed on the baffle plate, and the plurality of vents are evenly spaced on the baffle plate along the circumference of the rotor.

[0019] In some embodiments, the vents are located outside the windings of the stator in the radial direction of the rotor.

[0020] In some embodiments, the ratio of the outer diameter of the stator to the number of vents is 18-25.

[0021] In some embodiments, the air compressor includes a cooling water inlet, a cooling water outlet and a spiral flow channel. The cooling water inlet, the cooling water outlet and the spiral flow channel are all arranged on the shell. The cooling water inlet and the cooling water outlet are connected through the spiral flow channel. When the cooling water flows through the spiral flow channel, the iron core of the stator is cooled.

[0022] In some embodiments, in the axial direction of the rotor, two ends of the spiral flow channel extend beyond the two side edges of the core.

[0023] In some embodiments, in the axial direction of the rotor, the end of the spiral flow channel extends beyond the edge of the core by 20 to 30 mm.

[0024] A second aspect of the present disclosure further provides an air conditioner, which includes an air compressor according to an embodiment of the present disclosure.

[0025] A third aspect of the present disclosure further provides an automobile, which includes the air compressor of an embodiment of the present disclosure.

[0026] By providing a bearing air cooling channel on the radial bearing, cooling air can flow through the inside of the radial bearing, thereby helping to improve the cooling effect of the radial bearing in the air compressor.

[0027] Other features and advantages of the present disclosure will become apparent from the following detailed description of exemplary embodiments of the present disclosure with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the embodiments of the present disclosure or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present disclosure. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0029] Figure 1 It is a structural schematic diagram of the air compressor in the embodiment of the present disclosure.

[0030] Figure 2 Schematic diagram of the air path of the air cooling structure in the embodiment of the present disclosure.

[0031] Figure 3 It is a schematic diagram of the arrangement of the first axial flow channel and the vent in the embodiment of the present disclosure.

[0032] Figure 4 It is a schematic diagram of the arrangement of the first radial flow channel in the embodiment of the present disclosure.

[0033] Figure 5 It is a schematic diagram of the arrangement of the second axial flow channel and the second radial flow channel in the embodiment of the present disclosure.

[0034] Description of reference numerals:

[0035] 10. Air compressor;

[0036] 11. housing; 12. first sealing plate; 13. second sealing plate; 14. motor cavity; 15. bearing cavity;

[0037] 2. Motor; 21. Stator; 211. Iron core; 212. Winding; 22. Rotor; 23. First impeller; 24. Second impeller;

[0038] 3. radial bearing; 31. first radial bearing; 32. second radial bearing; 33. bearing shell;

[0039] 4. bearing seat; 41. first bearing seat; 42. second bearing seat; 43. mounting hole;

[0040] 5. Axial bearing; 51. First axial bearing; 52. Second axial bearing;

[0041] 6. Air cooling structure; 61. Cooling air inlet; 62. Cooling air outlet; 63. Bearing air cooling channel; 631. First bearing channel; 632. Second bearing channel; 633. First radial channel; 634. First axial channel; 635. Second axial channel; 636. Second radial channel; 64. Connecting channel; 65. Buffer chamber; 66. Baffle; 661. Vent; 662. Connecting hole;

[0042] 7. Water cooling structure; 71. Cooling water inlet; 72. Cooling water outlet; 73. Spiral flow channel;

[0043] 81. Sealing ring; 82. Sealing pad; DETAILED DESCRIPTION

[0044] The technical solutions in the embodiments of the present disclosure will be clearly and completely described below in conjunction with the drawings in the embodiments of the present disclosure. Obviously, the described embodiments are only part of the embodiments of the present disclosure, rather than all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means intended to limit the present disclosure and its application or use. Based on the embodiments in the present disclosure, all other embodiments obtained by ordinary technicians in this field without carrying out creative work are within the scope of protection of the present disclosure.

[0045] Technologies, methods, and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and equipment should be considered as part of the specification.

[0046] In the description of the present disclosure, it should be understood 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 disclosure.

[0047] In addition, the technical features involved in the different embodiments of the present disclosure described below can be combined with each other as long as they do not conflict with each other.

[0048] Figure 1-Figure 5 The structure of the air compressor disclosed in the present invention is exemplarily shown.

[0049] See also Figure 1 In some embodiments, the air compressor 10 is a centrifugal air compressor, which includes a housing 11, a motor 2, a compression device and a bearing device.

[0050] The housing 1 has a chamber inside to provide installation space for the motor 2 and other structural components such as a bearing device. As an example, the housing 1 is cylindrical.

[0051] The motor 2 is disposed in the housing 1 and includes a stator 21 and a rotor 22. The stator 21 is fixedly disposed in the housing 1. For example, in some embodiments, the stator 21 is fixed to the inner surface of the housing 1 by an interference connection. The rotor 22 is rotatably disposed in the housing 1 and passes through the stator 2, that is, the rotor 3 is rotatably disposed in the stator 21. The stator 21 includes an iron core 211 and a winding 212. The iron core 211 includes silicon steel sheets, which are stacked. The winding 212 is wound on the iron core 211, specifically, as shown in FIG. Figure 1 As shown, the winding 212 is wound on the inner wall of the core 211 and extends from the core 211 toward both axial sides to form a first coil (eg, Figure 1 A line package on the right side of the line package, which can also be called the right line package) and a second line package (for example Figure 1 A line package on the left side of the diagram, also called the left line package).

[0052] During operation, the rotor 22 rotates at high speed and cooperates with the stator 21 to achieve the conversion of electrical energy and mechanical energy to drive the compression device to rotate.

[0053] The compression device is used to compress the air and pressurize the air. The compression device includes an impeller disposed on the rotor 22. For example, see Figure 1 In some examples, the compression device includes two impellers, namely a first impeller 23 and a second impeller 24. The first impeller 23 and the second impeller 24 are respectively connected to the axial ends of the rotor 22 to rotate under the drive of the rotor 22 to form a negative pressure, inhale air from the outside, and make the air flow to the impeller outlet under the action of centrifugal force. The pressure of the air is increased through the diffusion effect of the impeller and the diffusion channel to achieve the purpose of air pressurization.

[0054] The bearing device is disposed on the rotor 22 to support the rotor 22. Figure 1In some embodiments, the bearing device includes a radial bearing 3, and the bearing device also includes an axial bearing 5. As an example, the radial bearing 3 and the axial bearing 5 are both gas bearings. In this case, the radial bearing 3 is a radial gas bearing, and the axial bearing 5 is an axial gas bearing. Gas bearings are bearings that work with gas, do not require lubrication with lubricating oil, and have the advantages of low friction, a wide applicable speed range and a wide temperature range.

[0055] Continue to see Figure 1 In some embodiments, the bearing device comprises at least two radial bearings 3. For example, Figure 1 It can be seen that in some embodiments, the bearing device includes two radial bearings 3, namely a first radial bearing 31 and a second radial bearing 32. The first radial bearing 31 and the second radial bearing 32 are arranged at the axial ends of the rotor 22 and at the axial sides of the stator 21. The two radial bearings 3 are respectively sleeved with bearing seats 4 outside, and the bearing seats 4 support the radial bearings 3. As an example, see Figure 3 The bearing seat 4 is provided with a mounting hole 43. During assembly, screws and other threaded connectors pass through the mounting hole 43 to achieve the installation and fixation of the bearing seat 4 on the housing 11. The bearing seat 4 corresponding to the first radial bearing 31 is called the first bearing seat 41, and the first bearing seat 41 supports the first radial bearing 31. The bearing seat 4 corresponding to the second radial bearing 32 is called the second bearing seat 42, and the second bearing seat 42 supports the second radial bearing 32. Figure 1 and Figure 2 As shown, a portion of the first bearing seat 41 extends out of the housing 11 and is connected to the first axial end face of the housing 11 through a sealing ring 81 (see Figure 2 The second bearing seat 42 is integrally located inside the housing 11 and is matched with the inner wall of the housing 11. At the same time, the first bearing seat 41 and the second bearing seat 42 are respectively provided with a first sealing plate 12 and a second sealing plate 13 on the axial outer sides. The first sealing plate 12 is located between the first impeller 23, the first radial bearing 31 and the first bearing seat 41. Figure 1 As shown, in some embodiments, the first sealing plate 12 and the first bearing seat 41 are sealed by a sealing ring 81. The second sealing plate 13 is located between the second impeller 24 and the second radial bearing 32, and the second sealing plate 13 cooperates with the second axial end surface of the housing 11 to seal the internal space of the housing 11 located axially outside the second bearing seat 42.

[0056] like Figure 1As shown, under the separation effect of the first bearing seat 41 and the second bearing seat 42, the chamber in the housing 11 is separated into a motor chamber 14 and a bearing chamber 15. The motor chamber 14 is located between the housing 11, the first bearing seat 41 and the second bearing seat 42. The motor chamber 14 is the space where the motor 2 is located, the stator 21 is located in the motor chamber 14, and the rotor 22 passes through the motor chamber 14. The bearing chamber 15 is located between the second bearing seat 42, the second sealing plate 13, the rotor 22 and the housing 11.

[0057] Also, see Figure 1 In some embodiments, the bearing device comprises at least two axial bearings 5. For example, Figure 1 It can be known that in some embodiments, the bearing device includes two axial bearings 5, namely a first axial bearing 51 and a second axial bearing 52. The first axial bearing 51 and the second axial bearing 52 are both located in the bearing cavity 15. At this time, the first axial bearing 51 and the second axial bearing 52 are both located on the side of the second radial bearing 32 away from the stator 21 (also the side of the second radial bearing 32 away from the first radial bearing 31). The first axial bearing 51 and the second axial bearing 52 are arranged in sequence along the direction away from the stator 21, that is, the first axial bearing 51 is closer to the stator 21 relative to the second axial bearing 52.

[0058] During the operation of the air compressor 10, the stator 21, the rotor 22 and the bearing device generate heat. If they are not effectively cooled, their performance may deteriorate and their life may be shortened, which may affect the operating accuracy, working reliability and service life of the air compressor 10. For example, the rotor 22 is affected by the frequency conversion harmonics, and its magnetic steel position may easily exceed the magnetic steel tolerance temperature, resulting in demagnetization. For another example, if the core 211 and the winding 212 of the stator 21 cannot be effectively cooled, the life and performance of the stator 21 will be affected. If the radial bearing 3 and the axial bearing 5 cannot be effectively cooled, the life and performance of the radial bearing 3 and the axial bearing 5 will also be affected.

[0059] Therefore, the air compressor 10 needs to be cooled to prevent the structural components of the air compressor 10 from overheating, thereby affecting the service life and performance stability.

[0060] Air cooling is usually used for the radial bearing 3. However, in the related art, the cooling air usually only flows through the surface of the radial bearing 3, such as through the gap between the radial bearing 3 and the rotor 22. In this case, the cooling air cannot fully remove the heat of the radial bearing 3, and the cooling effect needs to be improved.

[0061] In view of the above, see Figure 2In some embodiments of the present disclosure, the air compressor 10 includes an air cooling structure 6, and the air cooling structure 6 includes a cooling air inlet 61, a cooling air outlet 62, and a bearing air cooling channel 63. The cooling air inlet 61 and the cooling air outlet 62 are both arranged on the housing 11. Specifically, the cooling air inlet 61 and the cooling air outlet 62 are both arranged on the side wall of the housing 11 and communicated with the chamber in the housing 11. The bearing air cooling channel 63 is arranged on the radial bearing 3, for example, see Figure 4 In some embodiments, the bearing air cooling channel 63 is disposed on the bearing shell 33 of the radial bearing 3 and is located inside the bearing shell 33. The bearing air cooling channel 63 is communicated with the cooling air inlet 61 and the cooling air outlet 62.

[0062] Based on the above arrangement, the cooling air can flow through the bearing air cooling channel 63 in the process of flowing from the cooling air inlet 61 to the cooling air outlet 62. Since the bearing air cooling channel 63 is arranged on the radial bearing 3, the cooling air flowing through the bearing air cooling channel 63 actually flows through the inside of the radial bearing 3. In this way, compared with the situation where the cooling air only flows through the surface of the radial bearing 3 but not through the inside of the radial bearing 3, the heat of the radial bearing 3 can be more fully taken away, and the radial bearing 3 can be more fully cooled, which is beneficial to extend the service life of the radial bearing 3, and further beneficial to improve the operating stability and working reliability of the air compressor 10, and extend the service life of the air compressor 10.

[0063] As an example, see Figure 2 In the case where the air compressor 10 includes the first radial bearing 31 and the second radial bearing 32, the cooling air inlet 61 and the cooling air outlet 62 are sequentially arranged along the direction from the first radial bearing 31 to the second radial bearing 32, that is, the first radial bearing 31 and the second radial bearing 32 are sequentially arranged along the direction from the cooling air inlet 61 to the cooling air outlet 62, and the bearing air cooling channel 63 includes a first bearing channel 631 and a second bearing channel 632, the first bearing channel 631 is arranged on the first radial bearing 31, the second bearing channel 632 is arranged on the second radial bearing 32, and the first bearing channel 631 and the second bearing channel 632 are both connected to the motor cavity 14. In this way, the cooling air flowing into the housing 11 from the cooling air inlet 61 can flow through the first bearing channel 631 on the first radial bearing 31 and the second bearing channel 632 on the second radial bearing 32 in the process of flowing to the cooling air outlet 62, and the first radial bearing 31 and the second radial bearing 32 are cooled in sequence. Since the cooling air can flow through the inside of the first radial bearing 31 and the second radial bearing 32 , the first radial bearing 31 and the second radial bearing 32 can be cooled more fully.

[0064] As an implementation of the first bearing flow channel 631, see Figure 2The first bearing flow channel 631 includes a first radial flow channel 633 and a first axial flow channel 634. The first radial flow channel 633 extends along the radial direction of the rotor 22 (also the radial direction of the first radial bearing 31). The first axial flow channel 634 extends along the axial direction of the rotor 22 (also the axial direction of the first radial bearing 31). The first radial flow channel 633 is connected to the cooling air inlet 61 and is connected to the motor cavity 14 through the first axial flow channel 634, for example, see Figure 2 In some embodiments, a connecting flow channel 64 is provided on the first bearing seat 41, and the first radial flow channel 633 is connected to the cooling air inlet 61 through the connecting flow channel 64 on the first bearing seat 41, so that the bearing air cooling flow channel 63 is connected to the cooling air inlet 61 through the connecting flow channel 64 on the bearing seat 4. Based on this, when the cooling air flowing in from the cooling air inlet 61 flows through the first radial bearing 31, it can first enter the first radial flow channel 633 and flow radially, and then flow from the first radial flow channel 633 to the first axial flow channel 634 and flow axially, and then flow out from the first axial flow channel 634, flow into the motor cavity 14, and continue to flow downstream. This radial-first-then-axial flow mode is more in line with the relative position relationship between the first radial bearing 31 and the cooling air inlet 61, with a shorter flow path and a better cooling effect.

[0065] Among them, see Figure 3 and Figure 4 The number of the first radial flow channel 633, the first axial flow channel 634 and the connecting flow channel 64 on the first bearing seat 41 is not limited to one. Figure 3 and Figure 4 It can be seen that in some embodiments, the first radial bearing 31 is provided with a plurality of first radial channels 633 and a plurality of first axial channels 634, and these plurality of first radial channels 633 and the plurality of first axial channels 634 are uniformly distributed along the circumferential direction. Since the number of the first radial channels 633 and the first axial channels 634 is large and the distribution is uniform, it is conducive to achieving more sufficient and uniform cooling of the first radial bearing 31, and can prevent the first radial bearing 31 from forming a local high temperature zone due to local non-cooling. In addition, in some embodiments, the first bearing seat 41 is provided with a plurality of (for example, 4) connecting channels 64, and these plurality of connecting channels 64 are uniformly distributed on the first bearing seat 41 along the circumferential direction, and are connected with the first radial channels 633 one by one, so that the cooling gas can enter the first radial bearing 31 more uniformly, and the first radial bearing 31 is uniformly cooled.

[0066] As an implementation of the second bearing flow channel 632, see Figure 2The second bearing flow channel 632 includes a second axial flow channel 635 and a second radial flow channel 636. The second axial flow channel 635 extends along the axial direction of the rotor 22 (also the axial direction of the second radial bearing 32). The second radial flow channel 636 extends along the radial direction of the rotor 22 (also the radial direction of the second radial bearing 32). The second axial flow channel 635 is connected to the motor cavity 14 and is connected to the cooling gas outlet 62 through the second radial flow channel 636, for example, see Figure 2 and Figure 5 In some embodiments, a connecting flow channel 64 is provided on the second bearing seat 42, and the second radial flow channel 636 is connected to the cooling air outlet 62 through the connecting flow channel 64 on the second bearing seat 42, so that the bearing air cooling flow channel 63 can be connected to the cooling air outlet 62 through the connecting flow channel 64 on the bearing seat 4. Based on this, when the cooling air flows through the second radial bearing 32, it can first enter the second axial flow channel 635, flow in the axial direction, and then flow from the second axial flow channel 635 into the second radial flow channel 636, flow in the radial direction, and then flow out from the second radial flow channel 636 and continue to flow downstream. This flow mode of first axial and then radial is more in line with the relative position relationship characteristics between the second radial bearing 32 and the first radial bearing 31, the motor cavity 14 and the cooling air outlet 62, and the flow path is shorter and the cooling effect is better.

[0067] Among them, see Figure 5 The number of the second axial flow channel 635, the second radial flow channel 636, and the connecting flow channel 64 on the second bearing seat 42 is not limited to one. Figure 5 It can be seen that in some embodiments, the first radial bearing 31 is provided with a plurality of second axial flow channels 635 and a plurality of second radial flow channels 636, and the plurality of second axial flow channels 635 and the plurality of second radial flow channels 636 are uniformly distributed along the circumferential direction. Since the number of the second axial flow channels 635 and the second radial flow channels 636 are large and uniformly distributed, it is conducive to achieving more sufficient and uniform cooling of the second radial bearing 32, and can prevent the second radial bearing 32 from forming a local high temperature area due to local non-cooling. In addition, see Figure 5 In some embodiments, a plurality of (for example, 4) connecting flow channels 64 are provided on the second bearing seat 42. The plurality of connecting flow channels 64 are evenly distributed on the second bearing seat 42 along the circumferential direction, and are connected with the second radial flow channels 636 one by one. In this way, the cooling air flowing out of the second radial bearing 32 can flow downstream more evenly, thereby achieving uniform cooling of downstream components (for example, the axial bearing 5).

[0068] See also Figure 2In the case where the bearing device also includes an axial bearing 5, in some embodiments, the second radial flow channel 636 is connected to the cooling air outlet 62 through the space where the axial bearing 5 is located (i.e., the bearing cavity 15). In this way, the second bearing flow channel 632 is connected to the cooling air outlet 62 through the space where the axial bearing 5 is located, so that the cooling air flowing out of the second bearing flow channel 632 can flow through the axial bearing 5 in the process of flowing to the cooling air outlet 62, so as to cool the axial bearing 5, thereby realizing the sequential cooling of the first radial bearing 31, the second radial bearing 32 and the axial bearing 5 (for example, the first axial bearing 51 and the second axial bearing 52).

[0069] As a further improvement to the above embodiments, see Figure 2 The air cooling structure 6 includes a buffer chamber 65, which is located in the housing 11 and communicates with the cooling air inlet 61 and the bearing air cooling channel 63. Figure 2 As shown, in the embodiment where the air compressor 10 includes the first radial bearing 31 and the second radial bearing 32, the buffer cavity 65 is located upstream of the first radial bearing 31, that is, upstream of the first bearing flow channel 631. More specifically, Figure 2 As shown, when the first bearing flow channel 631 includes a first radial flow channel 633 and a first axial flow channel 634, the cache cavity 65 is located upstream of the first radial flow channel 633, and is specifically arranged on the first bearing seat 41, which is a complete annular groove on the first bearing seat 41, and is located upstream of the connecting flow channel 64 of the first bearing seat 41.

[0070] Based on the above arrangement, the cooling air flowing from the cooling air inlet 61 to the inside of the housing 1 first flows into the buffer cavity 65, and then flows to the bearing air cooling channel 63. In the case where the buffer cavity 65 is not provided, since the air pressure on the side close to the cooling air inlet 61 is usually larger in the radial direction, and the air pressure on the side away from the cooling air inlet 61 is usually smaller, it may cause the air flow rate on the side close to the cooling air inlet 61 to be larger, and the air flow rate on the side away from the cooling air inlet 61 to be smaller, resulting in uneven cooling, and the cooling on the side close to the cooling air inlet 61 is more sufficient, while the cooling on the side away from the cooling air inlet 61 is poor. After the buffer cavity 65 is provided, the buffer cavity 65 can cache the cooling air, make the air pressure distribution more uniform, prevent the air pressure difference between the side close to the cooling air inlet 61 and the side away from the cooling air inlet 61 from being too large, and guide the cooling air to be more fully distributed in the entire radial direction. Therefore, the cooling uniformity can be effectively improved, and uniform cooling of radially different parts of the components in the housing 11 (such as the radial bearing 3, the stator 21 and the rotor 22) can be achieved.

[0071] Further, see Figure 2 In some embodiments, the buffer cavity 65 not only connects the cooling air inlet 61 and the bearing air cooling channel 63, but also connects the cooling air inlet 61 and the motor cavity 14. Figure 2 As shown, the cooling air flowing from the cooling air inlet 61 to the buffer chamber 65 can flow downstream in two ways, one of which flows directly to the motor chamber 14, flows through the space between the stator 21 and the housing 11 and between the stator 21 and the rotor 22, and cools the stator 21 and the rotor 22 in the motor chamber 14, and the other flows to the radial bearing 3 first, cools the radial bearing 3, and then flows to the motor chamber 14, flows through the space between the stator 21 and the housing 11 and between the stator 21 and the rotor 22, and cools the stator 21 and the rotor 22 in the motor chamber 14. In this way, the radial bearing 3, the stator 21, and the rotor 22 can be cooled more effectively. Based on the cache pressure equalization effect of the buffer chamber 65, the cooling air can not only cool the different radial parts of the radial bearing 3 more evenly, but also cool the different radial parts of the stator 21 and the rotor 22 more evenly.

[0072] As a method for achieving communication between the buffer cavity 65 and the motor cavity 14, see Figure 2 The air cooling structure 6 includes a baffle 66, which is disposed in the housing 11 and closes the opening of the buffer cavity 65 toward the motor cavity 14, and a vent 661 is provided on the baffle 66, through which the buffer cavity 65 is connected to the motor cavity 14. Figure 3 In some embodiments, the baffle 66 is a circular ring plate, which is sleeved on the first bearing seat 41 and has a connecting hole 662 thereon. A screw or other threaded connector passes through the connecting hole 662 to fix the baffle 66 on the housing 11. Figure 2 As shown, a sealing gasket 82 is provided between the baffle 66 and the first bearing seat 41 to improve the sealing performance.

[0073] A baffle 66 is provided, and communication between the buffer cavity 65 and the motor cavity 14 is achieved through the vent 661 on the baffle 66. On the one hand, the cooling air in the buffer cavity 65 can be directly flowed into the motor cavity 14. On the other hand, it can also prevent the cooling air in the buffer cavity 65 from instantly rushing into the motor cavity 14. The cooling air is guided to flow toward the motor cavity 14 while also flowing toward the radial bearing 3, thereby effectively controlling the distribution of the cooling air flow between the motor cavity 14 and the radial bearing 3.

[0074] The number of the vents 661 is not limited. Figure 3 and Figure 4 In some embodiments, the number of the vents 661 may be multiple. As an example, the ratio of the outer diameter of the stator 21 to the number of the vents 661 is 18-25.

[0075] In order to further improve the cooling uniformity of the stator 21 and the rotor 22, see Figure 3 and Figure 4In some embodiments, the vents 661 on the baffle 66 are evenly spaced and arranged on the baffle 66 along the circumference of the rotor 22 (also the circumference of the baffle 66). In this way, the cooling air in the buffer cavity 65 can flow more evenly into the motor cavity 14, and the stator 21 and the rotor 22 can be cooled more evenly, achieving better cooling uniformity and preventing local high temperature.

[0076] Also, see Figure 2 In some embodiments, in the radial direction of the rotor 22, the vent 661 is located outside the winding 212 of the stator 21, that is, the vent 661 is located radially outside the winding 212 of the stator 21. Figure 2 As shown, after the gas flows out from the vent 661, it can be blown toward the winding 212 to cool the corresponding side coil package, thereby achieving sufficient cooling of the corresponding side coil package. It can be seen that this setting enables the coil package ( Figure 1 The winding package on the right side (i.e., the right winding package in the middle) is specially cooled, which can improve the cooling effect of the winding package compared to the case where the winding package is not specially cooled in the related art. In particular, when the vents 661 are evenly distributed along the circumference, uniform circumferential blowing can be achieved on the winding package on the side where the baffle 66 is located, and the corresponding side winding package can be evenly cooled. Effective cooling of the winding package is conducive to extending the service life of the stator 21 and improving the working reliability of the stator 21.

[0077] In the above-mentioned embodiments, the radial bearing 3, the axial bearing 5, the stator 21 and the rotor 22 are all cooled by air cooling.

[0078] In addition to using air cooling to cool the air compressor 10 , water cooling can also be used to cool the air compressor 10 .

[0079] Back to Figure 1 As a way of implementing the water-cooling method, the air compressor 10 includes a water-cooling structure 7, which includes a cooling water inlet 71, a cooling water outlet 72 and a spiral flow channel 73. The cooling water inlet 71, the cooling water outlet 72 and the spiral flow channel 73 are all arranged on the shell 11. The cooling water inlet 71 and the cooling water outlet 72 are connected through the spiral flow channel 73. When the cooling water flows through the spiral flow channel 73, the iron core 211 of the stator 21 is cooled. Specifically, the spiral flow channel 73 is located inside the shell 11. In this way, the iron core 211 of the stator 21 can be cooled based on the water cooling method, the temperature of the silicon steel plate of the stator 21 is reduced, and the service life of the stator 21 is extended.

[0080] Among them, Figure 1As shown, in some embodiments, in the axial direction of the rotor 22, both ends of the spiral flow channel 73 extend beyond the two side edges of the iron core 211 of the stator 21. For example, in the axial direction of the rotor 22, the end of the spiral flow channel 73 extends beyond the edge of the iron core 211 by 20 to 30 mm.

[0081] In the above-mentioned setting, since the axial ends of the spiral flow channel 73 extend axially outward relative to the axial ends of the iron core 211 of the stator 21, the spiral flow channel 73 can fully cover the iron core 211 of the stator 21, so that the silicon steel sheets of the stator 21 can be more fully water-cooled.

[0082] See also Figure 1 and Figure 2 When the air compressor 10 includes both the air cooling structure 6 and the water cooling structure 7 of the aforementioned embodiments, a composite cooling method of air cooling and water cooling can be used to cool the air compressor 10, thereby realizing a composite strong cooling process for the air compressor 10, effectively overcoming the limitations of using water cooling or air cooling alone, and more fully and effectively reducing the temperatures of the radial bearing 3, the axial bearing 5, the stator 21 and the rotor 22.

[0083] Next, combine Figure 1-5 The illustrated embodiment illustrates the above-mentioned composite intensive cooling process.

[0084] It should be understood that in the following description, 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 Figure 1 The orientation or positional relationship shown is only for the convenience of describing the present disclosure and simplifying the description. Unless otherwise stated, these orientation words do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the scope of protection of the present disclosure; the orientation words "inside and outside" refer to the inside and outside relative to the contour of each component itself.

[0085] like Figure 1-5 As shown, in the illustrated embodiment, the air compressor 10 includes a housing 11, a stator 21, a rotor 22, a first radial bearing 31, a first bearing seat 41, a second radial bearing 32, a second bearing seat 42, a first axial bearing 51, a second axial bearing 52, a first sealing plate 12, a second sealing plate 13 and a baffle 66.

[0086] like Figure 1 and Figure 2As shown, in this embodiment, the first radial bearing 31 and the second radial bearing 32 are arranged on the rotor 22 and are respectively located on the right and left sides of the stator 21. The first bearing seat 41 and the second bearing seat 42 are respectively supported between the first radial bearing 31 and the second radial bearing 32 and the housing 11. The space between the first bearing seat 41, the second bearing seat 42 and the housing 11 forms a motor cavity 14. The first sealing plate 12 is located on the right side of the first bearing seat 41. The second sealing plate 13 is located on the left side of the second bearing seat 42. The space between the second bearing seat 42, the second sealing plate 13, the housing 11 and the rotor 22 forms a bearing cavity 15, and the first axial bearing 51 and the second axial bearing 52 are both arranged in the bearing cavity 15, and the two are arranged in sequence from right to left.

[0087] like Figure 1 and Figure 2 As shown, in this embodiment, a cooling water inlet 71, a cooling water outlet 72, a spiral flow channel 73, a cooling air inlet 61 and a cooling air outlet 62 are provided on the shell 11. The cooling water inlet 71 and the cooling air outlet 62 are both located on the left side of the stator 21. The cooling water outlet 72 and the cooling air inlet 61 are both located on the right side of the stator 21. Any two of the cooling water inlet 71, the cooling water outlet 72, the cooling air inlet 61 and the cooling air outlet 62 may be located on the same plane of the shell 11, or may be arranged at an angle. The spiral flow channel 73 is connected to the cooling water inlet 71 and the cooling water outlet 72, and its left-right width is wider than the left-right width of the iron core 211 of the stator 21, and its flow area is 30 to 40 mm. 2 .

[0088] like Figure 2-4 As shown, in this embodiment, a cache cavity 65 and four communication channels 64 are provided on the first bearing seat 41. The cache cavity 65 is a groove opening toward the right side. The four communication channels 64 on the first bearing seat 41 are evenly distributed along the circumferential direction, and each communication channel 64 extends in the radial direction and connects the cache cavity 65 and the first radial bearing 31.

[0089] like Figure 2 As shown in FIG. 1 , a baffle 66 is provided at the opening of the buffer cavity 65 toward the right (i.e., the opening toward the motor cavity 14). The baffle 66 blocks the opening of the buffer cavity 65, and as shown in FIG. Figure 2-4 As shown, the baffle 66 is provided with a plurality of vents 661 evenly distributed along the circumferential direction, and the plurality of vents 661 are located radially outside the right coil of the stator 21, connecting the buffer cavity 65 with the motor cavity 14. Compared with the case where the buffer cavity 65, the baffle 66 and the cooling air inlet 61 are arranged on the left side, the advantage of arranging the buffer cavity 65, the baffle 66 and the cooling air inlet 61 on the right side is that the space on the right side is relatively large, which makes it more convenient to arrange the buffer cavity 65 and also makes it more convenient for the buffer cavity 65 to fully play the role of air equalization.

[0090] like Figure 2-4 As shown, in this embodiment, four first radial flow channels 633 and a plurality of first axial flow channels 634 are evenly distributed along the circumferential direction on the first radial bearing 31. Each first radial flow channel 633 is connected to each connecting flow channel 64 on the first bearing seat 41, and is connected to the inlet of the first axial flow channel 634. The outlet of each first axial flow channel 634 is connected to the motor cavity 14.

[0091] like Figure 5 As shown, in this embodiment, a plurality of second axial flow channels 635 and four second radial flow channels 636 are evenly distributed along the circumferential direction on the second radial bearing 32. The inlet of each second axial flow channel 635 is connected to the motor cavity 14. At the same time, the outlet of the second axial flow channel 635 is connected to the second bearing seat 42 through each second radial flow channel 636.

[0092] like Figure 5 As shown, in this embodiment, four communication channels 64 are evenly distributed along the circumferential direction on the second bearing seat 42. Each communication channel 64 on the second bearing seat 42 extends radially and connects each second radial channel 636 with the bearing cavity 15.

[0093] like Figure 5 and Figure 2 As shown, the bearing cavity 15 is communicated with the cooling air outlet 62 .

[0094] Based on the above configuration, this embodiment can implement a water-cooling process and an air-cooling process.

[0095] The water cooling process is as follows: cooling water enters the housing 11 from the cooling water inlet 71 , flows through the spiral flow channel 73 , takes away the heat of the housing 11 and the silicon steel sheets of the stator 21 , and then flows out from the cooling water outlet 72 .

[0096] like Figure 2 As shown by the arrow in the middle, the air cooling process is:

[0097] First, the cooling air enters the housing 11 through the cooling air inlet 61, flows through the connecting flow channel 64 provided on the first bearing seat 41, and then enters the buffer cavity 65 provided on the first bearing seat 41;

[0098] Then, the gas entering the buffer chamber 65 is divided into two parts as it continues to flow downstream, one part of the gas is directly blown toward the right winding package of the stator 21 through the air vents 661 evenly distributed 360° on the baffle 66, and the right winding package is evenly circumferentially blown to fully and evenly cool the right winding package; the other part of the gas flows through the first radial flow channels 633 on the first radial bearing 31 through the connecting flow channels 64 arranged on the first bearing seat 41, and flows to the first axial flow channels 634 on the first radial bearing 31. In this process, this part of the gas also gathers and drives the air in the space between the first bearing seat 41 and the first sealing plate 12 to flow fully. In the process of flowing through the first radial bearing 31, these cooling gases fully take away the heat of the first radial bearing 31. Of course, in this process, a part of the cooling gas also flows to the gap between the first radial bearing 31 and the rotor 22 for cooling;

[0099] After the cooling of the right coil and the first radial bearing is completed respectively, the two parts of gas are gathered in the gap between the stator 21 and the rotor 22, and continue to carry away the heat generated by harmonic heating and wind grinding loss of the rotor 22 through gas convection, thereby cooling the rotor 22;

[0100] After the cooling air flows out from the gap between the stator 21 and the rotor 22, a part of the cooling air flows radially outward, flows through the left winding package of the stator 21, and removes the heat of the left winding package. Then, the cooling air gathers with another part of the cooling air and flows through the second radial bearing 32, and flows through the second axial flow channel 635 and the second radial flow channel 636 on the second radial bearing 32 in sequence, and removes the heat of the second radial bearing 32.

[0101] Afterwards, all the cooling air flows out from the second radial flow channel 636 and reaches the bearing cavity 15, and drives the gas in the bearing cavity 15 to flow, thereby fully taking away the heat of the first axial bearing 51 and the second axial bearing 52;

[0102] Finally, the gas after absorbing heat flows to the outside of the housing through the cooling gas outlet 62 .

[0103] It can be seen that this embodiment uses a composite enhanced cooling method of water cooling + air cooling to cool the air compressor 10, which can not only effectively water cool the silicon steel plate of the stator 21, but also fully and evenly air cool the first radial bearing 31, the second radial bearing 32, the first axial bearing 51, the second axial bearing 52, the windings on both sides of the stator 21, and the rotor 22, wherein both sides of the windings can be evenly blown around and evenly cooled, and the two radial bearings and the two axial bearings can be more accurately managed for cooling air, so that each bearing can be effectively cooled. In this way, it is beneficial to improve the operating accuracy and working reliability of the air compressor 10 and extend the service life of the air compressor 10.

[0104] The air compressor 10 of this embodiment can be applied to various air-using systems, for example, it can be applied to the air supply system of a fuel cell engine of an automobile (such as an electric car), or it can also be applied to an air conditioner.

[0105] The above description is only an exemplary embodiment of the present disclosure and is not intended to limit the present disclosure. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present disclosure shall be included in the protection scope of the present disclosure.

Claims

1. An air compressor (10), characterized in that: include: A housing (11) having a motor chamber (14) therein; A motor (2) is disposed in the motor cavity (14) and comprises a stator (21) and a rotor (22), wherein the rotor (22) passes through the stator (21); a radial bearing (3) disposed on the rotor (22); and The air cooling structure (6) comprises a cooling air inlet (61), a cooling air outlet (62), a bearing air cooling channel (63), a buffer chamber (65) and a baffle (66), wherein the cooling air inlet (61) and the cooling air outlet (62) are both arranged on the housing (11), the bearing air cooling channel (63) is arranged on the radial bearing (3) and is in communication with the cooling air inlet (61) and the cooling air outlet (62), and the buffer chamber (65) is located in the housing (11) and is in communication with the cooling air inlet (61) and the cooling air outlet (62). The bearing air cooling channel (63), the cooling air inlet (61) and the motor cavity (14), the baffle (66) is arranged in the shell (11) and closes the opening of the cache cavity (65) facing the motor cavity (14), the baffle (66) is provided with a plurality of vents (661), and the plurality of vents (661) are evenly arranged on the baffle (66) along the circumference of the rotor (22), and the cache cavity (65) is connected to the motor cavity (14) through the vents (661).

2. The air compressor (10) according to claim 1, characterized in that: The air compressor (10) comprises at least two radial bearings (3), wherein the at least two radial bearings (3) comprise a first radial bearing (31) and a second radial bearing (32), wherein the first radial bearing (31) and the second radial bearing (32) are located on both axial sides of the stator (21) and are arranged in sequence along a direction from the cooling air inlet (61) to the cooling air outlet (62), and the bearing air cooling flow channel (63) comprises a first bearing flow channel (631) and a second bearing flow channel (632), wherein the first bearing flow channel (631) is arranged on the first radial bearing (31), and the second bearing flow channel (632) is arranged on the second radial bearing (32), and the first bearing flow channel (631) and the second bearing flow channel (632) are both connected to the motor cavity (14).

3. The air compressor (10) according to claim 2, characterized in that: The first bearing flow channel (631) comprises a first radial flow channel (633) and a first axial flow channel (634), wherein the first radial flow channel (633) extends in the radial direction of the rotor (22), and the first axial flow channel (634) extends in the axial direction of the rotor (22), and the first radial flow channel (633) is connected to the cooling air inlet (61) and is connected to the motor cavity (14) through the first axial flow channel (634); and / or the second bearing flow channel (632) comprises a second axial flow channel (635) and a second radial flow channel (636), wherein the second axial flow channel (635) extends in the axial direction of the rotor (22), and the second radial flow channel (636) extends in the radial direction of the rotor (22), and the second axial flow channel (635) is connected to the motor cavity (14) and is connected to the cooling air outlet (62) through the second radial flow channel (636).

4. The air compressor (10) according to claim 2, characterized in that: The air compressor (10) includes an axial bearing (5), which is arranged in the housing (11) and is located on the side of the second radial bearing (32) away from the first radial bearing (31). The second bearing flow channel (632) is connected to the cooling air outlet (62) through the space where the axial bearing (5) is located, so that the cooling air flowing out of the second bearing flow channel (632) flows through the axial bearing (5) in the process of flowing to the cooling air outlet (62), thereby cooling the axial bearing (5).

5. The air compressor (10) according to claim 1, characterized in that: The air compressor (10) comprises a bearing seat (4), wherein the bearing seat (4) supports the radial bearing (3), and a connecting flow channel (64) is provided on the bearing seat (4), and the cooling air inlet (61) and / or the cooling air outlet (62) are connected to the bearing air cooling flow channel (63) through the connecting flow channel (64).

6. The air compressor (10) according to claim 1, characterized in that: The bearing air cooling channel (63) is arranged on the bearing shell (33) of the radial bearing (3).

7. The air compressor (10) according to claim 1, characterized in that: In the radial direction of the rotor (22), the vent (661) is located outside the winding (212) of the stator (21).

8. The air compressor (10) according to any one of claims 1 to 7, characterized in that: The air compressor (10) comprises a cooling water inlet (71), a cooling water outlet (72) and a spiral flow channel (73); the cooling water inlet (71), the cooling water outlet (72) and the spiral flow channel (73) are all arranged on the housing (11); the cooling water inlet (71) and the cooling water outlet (72) are connected through the spiral flow channel (73); when the cooling water flows through the spiral flow channel (73), the iron core (211) of the stator (21) is cooled.

9. The air compressor (10) according to claim 8, characterized in that: In the axial direction of the rotor (22), two ends of the spiral flow channel (73) extend beyond the two side edges of the iron core (211).

10. The air compressor (10) according to claim 9, characterized in that: In the axial direction of the rotor (22), the end of the spiral flow channel (73) extends to 20 to 30 mm beyond the edge of the iron core (211).

11. An air conditioner, characterized in that: It comprises an air compressor (10) as described in any one of claims 1 to 10.

12. A car, characterized in that: It comprises an air compressor (10) as described in any one of claims 1 to 10.

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