Two-stage air floating air compressor cooling system

Abstract

This application provides a two-stage air-float air compressor cooling system, belonging to the field of air compressor technology. It includes a main shaft, stator, housing, and cooling channels. The stator, housing, and main shaft are integrated, enabling better heat conduction and thus helping the air compressor dissipate heat. This also reduces the overall size and weight of the air compressor, facilitating its miniaturization. The cooling channels are used to cool the housing. By placing the inlet and outlet of the cooling channels at the same end of the housing, the cooling medium can flow back and forth within the housing, forming a circulating cooling loop in the water-cooling channel. This makes the temperature of the cooling medium more uniform during flow, resulting in more uniform cooling of the housing and its internal components. This improves the uniformity of heat dissipation in the air compressor, providing excellent cooling performance and preventing thermal bending deformation of internal components due to uneven heat dissipation and temperature gradients. Effective cooling ensures normal and stable operation of the air compressor and extends its service life.

Description

Technical Field

[0001] This application belongs to the field of air compressor technology, specifically relating to a two-stage air-float air compressor cooling system. Background Technology

[0002] Currently, centrifugal air compressors are generally designed using a direct-drive permanent magnet motor, integrating the motor rotor and main shaft into a single structure. A centrifugal impeller is fixedly connected to the end of the main shaft, and the impeller is housed within a volute. Under the ultra-high-speed rotation of the rotor, the impeller drives the gas to rotate at high speed, interacting with the volute to generate high-pressure, high-flow-rate air, which is then supplied to the fuel cell engine. To increase the pressure and flow rate of the output air, centrifugal air compressors often employ ultra-high speed control. However, ultra-high-speed rotation can lead to insufficient cooling and heat dissipation in the air compressor.

[0003] For example, patent application CN112761971A discloses a high-speed centrifugal air compressor supported by a two-stage air foil bearing. The cooling medium enters the cooling water channel from the cooling water inlet connector. After circulating once in the cooling water channel, the cold water flows out from the cooling water outlet connector, carrying away the heat inside the casing. However, this cooling structure has poor cooling effect and poor heat dissipation uniformity of the air compressor, which affects the normal operation of the air compressor. Summary of the Invention

[0004] The present invention aims to solve at least one of the technical problems existing in the prior art or related art.

[0005] In view of this, a two-stage air-float air compressor cooling system is proposed according to an embodiment of this application, comprising:

[0006] Main spindle, with a stator mounted on it;

[0007] The housing is fitted onto the outside of the stator, and the inner wall of the housing is in contact with the outer wall of the stator.

[0008] The cooling channel is arranged on the shell along the circumference, with the inlet and outlet ends of the cooling channel located at the same end of the shell.

[0009] In one feasible implementation, the cooling channels are arranged spirally on the housing along the axial direction of the housing.

[0010] In one feasible implementation, the cooling channel includes:

[0011] The water inlet channel is spirally arranged inside the side wall of the shell along the axial direction of the shell;

[0012] The water inlet is located on the outer wall of the shell and is connected to the water inlet channel.

[0013] The return water channel is spirally arranged inside the side wall of the shell along the axial direction of the shell, and the return water channel is connected to the inlet water channel.

[0014] The return water inlet is located on the outer wall of the shell. It is connected to the return water channel and is located at the same end of the shell as the inlet.

[0015] In one feasible implementation, the return water channel and the inlet water channel are distributed at intervals along the axial direction of the shell.

[0016] In one feasible implementation, the two-stage air-float compressor cooling system further includes:

[0017] The primary compression chamber is connected to the shell and is used for primary compression of the gas.

[0018] The thrust bearing assembly is mounted on the outside of the main shaft and is connected to the housing.

[0019] The first radial bearing assembly is mounted on the outside of the main shaft and is connected to the thrust bearing assembly. The first radial bearing assembly is located inside the housing.

[0020] The first connecting channel is disposed on the thrust bearing assembly and is connected to the first-stage compression chamber.

[0021] The second connecting channel is disposed on the first radial bearing assembly and is connected to the first connecting channel and the housing to cool the inside of the housing by means of primary compressed gas, thereby forming a cooling chamber inside the housing.

[0022] In one feasible implementation, the thrust bearing assembly includes a thrust bearing housing, which is fitted onto the outside of the main shaft and connected to the housing. The thrust bearing housing is provided with a first communication channel.

[0023] The first connecting channel includes:

[0024] The first annular portion is disposed on the thrust bearing housing along the circumference of the thrust bearing housing, and the first annular portion is connected to the second connecting channel.

[0025] The air intake section is arranged radially on the thrust bearing seat along the first annular section, and the air intake section is connected to the first annular section and the first-stage compression chamber.

[0026] In one feasible implementation, the first radial bearing assembly includes a first radial bearing and a first bearing housing, the first bearing housing being fitted onto the outside of the first radial bearing, the first bearing housing being connected to a thrust bearing housing, and the first bearing housing being provided with a second communicating channel.

[0027] The second connecting channel consists of several guide holes. The guide holes penetrate the first bearing housing along the axial direction and are arranged on the first bearing housing in the circumferential direction. The guide holes are connected to the first annular part.

[0028] The guide hole includes a first guide hole, a second guide hole, and a third guide hole, which are respectively arranged on different circumferences of the first bearing housing.

[0029] In one feasible implementation, the two-stage air-float compressor cooling system further includes:

[0030] The second back plate is fitted onto the outside of the main shaft and is connected to the housing.

[0031] The third connecting channel is located on the second back plate and is used to exhaust gas from the cooling chamber.

[0032] The secondary compression chamber is connected to the shell and is connected to the primary compression chamber. The secondary compression chamber is used to perform secondary compression on the primary compressed gas.

[0033] The second radial bearing assembly is mounted on the outside of the spindle, fixed to the second back plate, and located in the cooling chamber.

[0034] In one feasible implementation, the third communication channel includes:

[0035] The second annular portion is disposed on the second back plate along the circumference of the second back plate, and the second annular portion is connected to the cooling chamber.

[0036] An exhaust section is provided on the second back plate along the radial direction of the second annular portion, and the exhaust section is connected to the second annular portion.

[0037] In one feasible implementation, the two-stage air-float compressor cooling system further includes:

[0038] An exhaust passage that penetrates the housing and is connected to a third connecting passage;

[0039] The exhaust port is located on the housing and is connected to the exhaust channel.

[0040] The two-stage air-float air compressor cooling system disclosed in this application has the following advantages compared with the prior art:

[0041] The stator, housing, and main shaft are designed as a single unit, which can conduct heat better, thus helping the air compressor dissipate heat. It can also reduce the overall size and weight of the machine, which is conducive to the miniaturization of the air compressor.

[0042] The cooling channel is used to cool the housing. By setting the inlet and outlet of the cooling channel at the same end of the housing, the cooling medium can flow back and forth in the housing, forming a circulating cooling loop in the water-cooling channel. This makes the temperature of the cooling medium more uniform during flow, thereby making the cooling of the housing and its internal components more uniform, improving the uniformity of heat dissipation of the air compressor, and resulting in good cooling effect. At the same time, by setting a first connecting channel on the thrust bearing assembly and a second connecting channel on the first radial bearing assembly, the primary compression chamber is connected to the cavity inside the housing through the first and second connecting channels. This allows the first compressed gas to be delivered to the cavity inside the housing, forming a cooling chamber inside the housing. The generated compressed gas is directly drawn from inside the housing to cool the housing and its internal components. The dual circulation pipeline and the compressed gas are drawn in from the inside of the housing for simultaneous cooling both outside and inside. This prevents the internal components of the air compressor from thermally bending and deforming due to uneven heat dissipation and temperature gradients. It effectively cools the air compressor, prevents rotor vibration caused by rotor thermal bending deformation, and ensures normal and stable operation of the air compressor, extending its service life. Attached Figure Description

[0043] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0044] Figure 1 A schematic structural diagram of a two-stage air-float air compressor cooling system according to an embodiment of this application, taken from the first angle.

[0045] Figure 2 A schematic structural diagram of the cooling path within a two-stage air-float air compressor cooling system according to an embodiment of this application;

[0046] Figure 3 A schematic structural diagram of a two-stage air-float air compressor cooling system according to an embodiment of this application, taken from a second angle.

[0047] Figure 4 A schematic structural diagram of the cooling channel of a two-stage air-float air compressor cooling system according to an embodiment of this application;

[0048] Figure 5 for Figure 1 Enlarged view of point A;

[0049] Figure 6A schematic structural diagram of the first angle of the first connecting channel of a two-stage air-float air compressor cooling system according to an embodiment of this application;

[0050] Figure 7 A schematic structural diagram of the second angle of the first connecting channel of a two-stage air-float air compressor cooling system according to an embodiment of this application;

[0051] Figure 8 for Figure 1 Enlarged view of point B;

[0052] Figure 9 A schematic structural diagram of the second connecting channel of a two-stage air-float air compressor cooling system according to an embodiment of this application;

[0053] in, Figures 1 to 8 The correspondence between the reference numerals and component names in the attached drawings is as follows:

[0054] 110; Spindle; 120; Stator; 130; Housing; 140; Cooling channel; 210; Primary compression chamber; 220; Thrust bearing assembly; 230; First radial bearing assembly; 240; First connecting channel; 250; Second connecting channel; 310; Second back plate; 320; Third connecting channel; 330; Secondary compression chamber; 340; Second radial bearing assembly; 410; Exhaust channel; 420; Exhaust port; 430; Cooling chamber;

[0055] 141. Water inlet channel; 142. Water inlet; 143. Water return channel; 144. Water return outlet; 221. Thrust bearing; 222. Thrust bearing housing; 231. First radial bearing; 232. First bearing housing; 241. First annular portion; 242. Air intake portion; 251. First guide hole; 252. Second guide hole; 253. Third guide hole; 321. Second annular portion; 322. Exhaust portion; 341. Second radial bearing; 342. Second bearing housing. Detailed Implementation

[0056] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application and simplifying the description, and 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. Therefore, they should not be construed as limitations on this application.

[0057] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0058] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0059] The preferred embodiments of this application are described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit this application.

[0060] like Figures 1 to 4 As shown in the embodiment of this application, a two-stage air-float air compressor cooling system is proposed, including: a main shaft 110, a housing 130, and a cooling channel 140; a stator 120 is provided on the main shaft 110; the housing 130 is fitted on the outside of the stator 120, and the inner wall surface of the housing 130 is in contact with the outer wall surface of the stator 120; the cooling channel 140 is arranged circumferentially on the housing 130, and the inlet end and outlet end of the cooling channel 140 are located at the same end of the housing 130.

[0061] The two-stage air-float air compressor cooling system provided in this embodiment includes a main shaft 110, a stator 120, a housing 130, and a cooling channel 140. The housing 130 is fitted onto the outside of the stator 120. The stator 120, housing 130, and main shaft 110 are integrated, which improves heat conduction and helps dissipate heat from the air compressor. It also reduces the overall size and weight of the air compressor, which is beneficial for miniaturization. The cooling channel 140 is used to cool the housing 130. By setting the inlet and outlet of the cooling channel 140 at the same end of the housing 130, the cooling... The cooling medium can flow back and forth in the housing 130, forming a circulating cooling loop in the water cooling channel. This makes the temperature more uniform when the cooling medium flows, thereby making the cooling of the housing 130 and its internal components more uniform. This improves the uniformity of heat dissipation of the air compressor, resulting in better cooling effect. It also prevents the internal components of the air compressor from experiencing thermal bending deformation due to uneven heat dissipation and temperature gradients. This effectively cools the air compressor, preventing rotor vibration caused by thermal bending deformation, which would otherwise cause vibration of the entire air compressor. This ensures the normal and stable operation of the air compressor and extends its service life.

[0062] Furthermore, heat sinks are provided on the outer wall of the housing 130 to further improve the heat dissipation capacity of the housing 130, so that the heat inside the housing 130 can be transferred to the housing 130, which is beneficial to improving the heat dissipation efficiency of the air compressor.

[0063] Furthermore, the cooling medium can be gas or liquid, and when the cooling medium is liquid, the cooling effect on the air compressor is better.

[0064] like Figure 4 As shown, in one feasible embodiment, the cooling channel 140 is spirally arranged on the housing 130 along the axial direction of the housing 130.

[0065] In this technical solution, by spirally arranging the cooling channel 140 along the axial direction of the housing 130 on the housing 130, the cooling channel 140 extends along the length direction of the housing 130, increasing the contact area between the cooling channel 140 and the housing 130, thereby improving the cooling efficiency and effect of the cooling channel 140 and rapidly cooling the air compressor.

[0066] like Figure 3 and Figure 4As shown, in one feasible embodiment, the cooling channel 140 includes: a water inlet channel 141, a water inlet 142, a water return channel 143, and a water return outlet 144; the water inlet channel 141 is spirally arranged in the side wall of the housing 130 along the axial direction of the housing 130; the water inlet 142 is arranged on the outer wall of the housing 130 and is connected to the water inlet channel 141; the water return channel 143 is spirally arranged in the side wall of the housing 130 along the axial direction of the housing 130 and is connected to the water inlet channel 141; the water return outlet 144 is arranged on the outer wall of the housing 130 and is connected to the water return channel 143, and the water return outlet 144 and the water inlet 142 are located at the same end of the housing 130.

[0067] In this technical solution, the cooling medium is introduced into the water inlet channel 141 through the water inlet 142. The cooling medium flows from the first end of the housing 130 to the second end of the housing 130 through the water inlet channel 141, then enters the water return channel 143 and flows back from the second end of the housing 130 to the first end of the housing 130, and then is discharged from the water return port 144. In this way, the cooling medium flows back and forth along the housing 130 to form a circulating cooling loop. Compared with a unidirectional cooling structure, the water inlet channel 141 and the water return channel 143 allow the cooling medium to cool the internal components of the air compressor more evenly, avoiding the problem of one end of the air compressor not being effectively cooled for a long time, which would shorten the service life of the air compressor, thus effectively extending the service life of the air compressor.

[0068] Furthermore, both the inlet 142 and the outlet 144 are located at the secondary compression end of the air compressor. The secondary compression end will accumulate more heat than the primary compression end. By allowing the cooling medium to enter from the secondary compression end, it is beneficial to cool the secondary compression end quickly, so that the temperature of the slightly higher secondary compression end drops more significantly, while the temperature of the slightly lower primary compression end drops less significantly, which is beneficial to improving the temperature uniformity of the air compressor.

[0069] like Figure 4 As shown, in one feasible embodiment, the return water channel 143 and the inlet water channel 141 are distributed at intervals along the axial direction of the housing 130.

[0070] In this technical solution, by distributing the return water channel 143 and the inlet water channel 141 at intervals along the length of the housing 130, the inlet water with a lower temperature and the return water with a slightly higher temperature are interspersed around the circumference of the housing 130. This not only prevents local overheating of the air compressor, but also reduces the temperature difference between the two ends of the air compressor, allowing the air compressor to dissipate heat evenly, improving the cooling effect of the air compressor, and making the air compressor more uniform in temperature after cooling, which is conducive to the stable operation of the air compressor.

[0071] It is understandable that the water inlet channel 141 and the water return channel 143 are two spiral channels. The water inlet channel 141 and the water return channel 143 are spaced apart, which is equivalent to inserting one spiral channel into the other spiral channel. That is, the water inlet channel 141 and the water return channel 143 are arranged in the gap between each other, so that the water inlet and water return flow through the length of the housing 130, improving the uniformity of the temperature of the cooling medium in the housing 130, thereby improving the uniformity of heat dissipation of the air compressor.

[0072] like Figure 1 As shown, in one feasible embodiment, the two-stage air-float compressor cooling system further includes: a primary compression chamber 210, a thrust bearing assembly 220, a first radial bearing assembly 230, a first connecting channel 240, and a second connecting channel 250; the primary compression chamber 210 is connected to the housing 130 and is used for primary compression of the gas; the thrust bearing assembly 220 is fitted onto the outside of the main shaft 110 and is connected to the housing 130; the first radial bearing assembly 230 is fitted onto the outside of the main shaft 110. The first radial bearing assembly 230 is connected to the thrust bearing assembly 220, and the first radial bearing assembly 230 is located inside the housing; the first connecting channel 240 is disposed on the thrust bearing assembly 220 and is connected to the primary compression chamber 210; the second connecting channel 250 is disposed on the first radial bearing assembly 230 and is connected to the first connecting channel 240 and the housing 130, so as to cool the inside of the housing 130 by primary compressed gas, so that a cooling chamber 430 is formed inside the housing 130.

[0073] In this technical solution, the primary compression chamber 210 is used to compress the gas in the first stage to generate primary compressed gas in the primary compression chamber 210. By providing a first connecting channel 240 on the thrust bearing assembly 220 and a second connecting channel 250 on the first radial bearing assembly 230, the primary compression chamber 210 is connected to the cavity in the housing 130 through the first connecting channel 240 and the second connecting channel 250, thereby delivering the first compressed gas to the cavity in the housing 130, forming a cooling chamber 430 inside the housing 130 to cool the housing 130 and its internal components.

[0074] In this technical solution, the primary compression chamber 210 includes a first impeller and a first volute. The first impeller is fixed on the main shaft 110 and rotates synchronously with the main shaft 110. The first volute is fixed to one end of the housing 130 and forms the primary compression chamber 210. The first impeller is located inside the primary compression chamber 210 of the first volute. When the first impeller rotates synchronously with the main shaft 110, primary compressed gas is generated in the primary compression chamber 210. This gas passes through the first connecting channel 240 on the thrust bearing assembly 220 and the first radial bearing assembly 230. The second connecting channel 250 limits the flow direction of the primary compressed gas, allowing a small portion of the gas to enter the cooling chamber 430 through the first connecting channel 240 and the second connecting channel 250 to cool the internal components of the housing 130. This allows most of the primary compressed gas to enter the secondary compression chamber 330 through the first volute for secondary compression. The design of the internal gas cooling path of the air compressor is more reasonable, making the stator 120 components more compactly matched. This saves on manufacturing costs and allows the air compressor to occupy less space, which is beneficial for the miniaturization of the air compressor.

[0075] Furthermore, the first radial bearing 231 and the thrust bearing 221 are selected as air suspension bearings. The high-pressure gas generated by the first radial bearing 231 and the thrust bearing 221 themselves forms an air film, which reduces the friction between the bearing and the main shaft 110, reduces mechanical loss, and helps to extend the service life of the air compressor.

[0076] like Figures 5 to 7 As shown, in one feasible embodiment, the thrust bearing assembly 220 includes a thrust bearing housing 222, which is fitted onto the outside of the main shaft 110 and connected to the housing 130. A first connecting channel 240 is provided on the thrust bearing housing 222. The first connecting channel 240 includes a first annular portion 241 and an air intake portion 242. The first annular portion 241 is disposed circumferentially on the thrust bearing housing 222 and is connected to the second connecting channel 250. The air intake portion 242 is disposed radially on the thrust bearing housing 222 along the first annular portion 241 and is connected to the first annular portion 241 and the primary compression chamber 210.

[0077] In this technical solution, the gas intake section 242 is used to introduce the primary compressed gas in the primary compression chamber 210 into the first annular section 241. The gas is taken in at a 360° cross section through the first annular section 241, which reduces the pressure change after the gas is diverted in the primary compression chamber 210. This can maximize the smooth flow of the mainstream gas in the primary compression chamber 210 and prevent the flow turbulence caused during the cooling gas intake process, thereby ensuring the stable operation of the air compressor and ensuring that the original working efficiency of the air compressor is not affected.

[0078] like Figures 5 to 7As shown, in one feasible embodiment, the first radial bearing assembly 230 includes a first radial bearing 231 and a first bearing housing 232. The first bearing housing 232 is fitted onto the outside of the first radial bearing 231. The first bearing housing 232 is connected to the thrust bearing housing 222. A second connecting channel 250 is provided on the first bearing housing 232. The second connecting channel 250 is composed of a plurality of guide holes. The guide holes penetrate the first bearing housing 232 along the axial direction and are arranged on the first bearing housing 232 circumferentially. The guide holes are connected to the first annular portion 241. The guide holes include a first guide hole 251, a second guide hole 252, and a third guide hole 253. The first guide hole 251, the second guide hole 252, and the third guide hole 253 are respectively arranged on different circumferences of the first bearing housing 232.

[0079] In this technical solution, several guide holes penetrating the first bearing housing 232 constitute the second connecting channel 250. By setting the guide holes on different circumferences of the first bearing housing 232, the primary compressed gas can enter the cooling chamber 430 from different positions of the first bearing housing 232, which plays a role in diverting and slowing the flow, so that the primary compressed gas enters the cooling chamber 430 in a more dispersed form. This ensures that the primary compressed gas has sufficient uniformity when entering the cooling chamber 430, prevents the cooling airflow from concentrating, and thus improves the uniformity of heat dissipation of the air compressor.

[0080] Furthermore, the first guide hole 251, the second guide hole 252 and the third guide hole 253 have different diameters. By setting guide holes with different diameters, the gas flow rate is adjusted so that the primary compressed gas enters the cooling chamber 430 at a more uniform speed.

[0081] like Figure 8 and Figure 9 As shown, in one feasible embodiment, the two-stage air-float compressor cooling system further includes: a second back plate 310, a third connecting channel 320, a secondary compression chamber 330, and a second radial bearing assembly 340; the second back plate 310 is fitted onto the outside of the main shaft 110 and is connected to the housing 130; the third connecting channel 320 is disposed on the second back plate 310 and is used to discharge gas from the cooling chamber 430; the secondary compression chamber 330 is connected to the housing 130 and communicates with the primary compression chamber 210, and is used to perform secondary compression on the primary compressed gas; the second radial bearing assembly 340 is fitted onto the outside of the main shaft 110, fixed on the second back plate 310, and is located within the cooling chamber 430.

[0082] In this technical solution, a third connecting channel 320 is provided in the second back plate 310 to connect with the cooling chamber 430, allowing the primary compressed gas in the cooling chamber 430 to be discharged through the third connecting channel 320. This prevents the gas in the cooling chamber 430 from flowing back into the primary compression chamber 210, ensuring smooth flow of the mainstream gas in the primary compression chamber 210. This avoids flow turbulence during the gas intake process of the cooling chamber 430, which would lead to a decrease in air compressor efficiency and ensure stable operation of the air compressor. The internal gas cooling circuit design of the air compressor is more reasonable, and the stator 120 components are more compactly matched. This saves on processing and manufacturing costs and allows the air compressor to occupy less space, which is beneficial for the miniaturization of the air compressor.

[0083] In this technical solution, the secondary compression chamber 330 includes a second impeller and a second volute. The second impeller is fixed on the main shaft 110 and rotates synchronously with the main shaft 110. The second volute is fixed to the other end of the housing 130 and forms the secondary compression chamber 330. The second impeller is located inside the secondary compression chamber 330 of the second volute. When the second impeller rotates synchronously with the main shaft 110, secondary compressed gas is formed in the secondary compression chamber 330 and discharged from the exhaust port 420 on the second volute. The flow direction of the gas in the cooling chamber 430 is limited by the third connecting channel 320 on the second back plate 310 to ensure smooth flow of the mainstream gas in the primary compression chamber 210, thereby avoiding flow turbulence during the gas intake process of the cooling chamber 430 and ensuring stable operation of the air compressor.

[0084] It is understandable that, since the first impeller and the second impeller are respectively set at both ends of the main shaft 110, the axial thrust of the two impellers can cancel each other out during the process of the rotor driving the two impellers to rotate, thereby reducing the axial force applied by the thrust bearing 221, so as to reduce the interaction force between the components, which is beneficial to reduce the wear of the air compressor and extend the service life of the air compressor.

[0085] Furthermore, the secondary compression chamber 330 is connected to the primary compression chamber 210 through a connecting pipe outside the outer housing 130. The secondary compression chamber 330 is used to further compress the primary compressed gas to generate secondary compressed gas within the secondary compression chamber 330.

[0086] like Figure 8 and Figure 9 As shown in one feasible embodiment, the third connecting channel 320 includes: a second annular portion 321 and an exhaust portion 322; the second annular portion 321 is disposed circumferentially on the second back plate 310 and is connected to the cooling chamber 430; the exhaust portion 322 is disposed radially on the second back plate 310 along the second annular portion 321 and is connected to the second annular portion 321.

[0087] In this technical solution, by arranging the second annular portion 321 along the circumference of the second back plate 310 and taking in air at the 360° cross section of the second back plate, the uniformity of gas flow in the cooling chamber 430 can be maximized, so that the primary compressed gas is evenly distributed in the cooling chamber 430, thereby evenly removing the heat from the housing 130 and its internal components, and making the air compressor dissipate heat evenly, which is conducive to maintaining the stable operation of the air compressor. By connecting the exhaust portion 322 with the second annular portion 321, the gas in the cooling chamber 430 is guided by the exhaust portion 322 to be discharged along a preset path, ensuring the smoothness of exhaust from the cooling chamber 430.

[0088] In one feasible embodiment, the two-stage air-float compressor cooling system further includes: an exhaust passage 410 and an exhaust port 420; the exhaust passage 410 penetrates the housing 130 and is connected to the third connecting passage 320; the exhaust port 420 is disposed on the housing 130 and is connected to the exhaust passage 410.

[0089] In this technical solution, by opening an exhaust channel 410 on the side wall of the housing 130 and setting an exhaust port 420 on the outer wall of the housing 130, the gas in the cooling chamber 430 is discharged from the housing 130 through the exhaust port 420 after passing through the third connecting channel 320 and the exhaust channel 410. This realizes the exhaust function of the cooling chamber 430, ensuring smooth flow of the mainstream gas in the primary compression chamber 210, thereby avoiding flow turbulence during the gas intake process of the cooling chamber 430, ensuring stable operation of the air compressor, and using high-pressure airflow to remove the heat generated by friction of the air compressor's operating parts, thereby improving the service life of the components inside the air compressor.

[0090] It will be readily understood by those skilled in the art that the aforementioned advantageous methods can be freely combined and superimposed without conflict.

[0091] The above are merely preferred embodiments of this application and are not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application. The above are merely preferred embodiments of this application. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of this application, and these improvements and modifications should also be considered within the protection scope of this application.

Claims

1. A two-stage air-float air compressor cooling system, characterized in that, The two-stage air-float air compressor cooling system includes: A main spindle, on which a stator is provided; A housing, which is fitted onto the outside of the stator, with the inner wall of the housing fitting against the outer wall of the stator; A cooling channel is provided on the housing along the circumference of the housing, and the inlet and outlet ends of the cooling channel are located at the same end of the housing; A primary compression chamber is connected to the housing and is used for primary compression of gas. A thrust bearing assembly, which is fitted onto the outside of the main shaft and connected to the housing; A first radial bearing assembly is fitted onto the outside of the main shaft, is connected to the thrust bearing assembly, and is located inside the housing. A first connecting channel is disposed on the thrust bearing assembly and is connected to the first-stage compression chamber. The second connecting channel is disposed on the first radial bearing assembly and is connected to the first connecting channel and the housing to cool the interior of the housing with primary compressed gas, thereby forming a cooling chamber inside the housing. The thrust bearing assembly includes a thrust bearing housing, which is fitted onto the outside of the main shaft. The thrust bearing housing is connected to the housing, and the first communicating channel is provided on the thrust bearing housing. The first communication channel includes: A first annular portion is disposed on the thrust bearing housing along the circumference of the thrust bearing housing, and the first annular portion is connected to the second communicating channel; An air intake section is provided on the thrust bearing seat along the radial direction of the first annular portion, and the air intake section is connected to the first annular portion and the first-stage compression chamber. The first radial bearing assembly includes a first radial bearing and a first bearing housing. The first bearing housing is fitted onto the outside of the first radial bearing and is connected to the thrust bearing housing. The first bearing housing is provided with a second communicating channel. The second connecting channel is composed of a plurality of guide holes, which penetrate the first bearing seat along the axial direction and are arranged on the first bearing seat along the circumference of the first bearing seat. The guide holes are connected to the first annular portion. The guide hole includes a first guide hole, a second guide hole, and a third guide hole, which are respectively arranged on different circumferences of the first bearing seat.

2. The two-stage air-float air compressor cooling system according to claim 1, characterized in that: The cooling channel is spirally arranged on the housing along the axial direction of the housing.

3. The two-stage air-float air compressor cooling system according to claim 2, characterized in that, The cooling channel includes: A water inlet channel is spirally arranged within the side wall of the housing along the axial direction of the housing. A water inlet is provided on the outer wall of the housing and is connected to the water inlet channel; A return water channel is spirally arranged in the side wall of the housing along the axial direction of the housing, and the return water channel is connected to the inlet water channel; The return water inlet is disposed on the outer wall surface of the housing, and is connected to the return water channel. The return water inlet and the inlet are located at the same end of the housing.

4. The two-stage air-float air compressor cooling system according to claim 3, characterized in that: The return water channel and the inlet water channel are distributed at intervals along the axial direction of the shell.

5. The two-stage air-float air compressor cooling system according to claim 1, characterized in that, The two-stage air-float air compressor cooling system also includes: The second back plate is fitted onto the outside of the main shaft and is connected to the housing. A third connecting channel is disposed on the second back plate and is used to exhaust gas from the cooling chamber. A secondary compression chamber is connected to the housing and communicates with the primary compression chamber. The secondary compression chamber is used to perform secondary compression on the primary compressed gas. The second radial bearing assembly is fitted onto the outside of the spindle, fixed to the second back plate, and located within the cooling chamber.

6. The two-stage air-float air compressor cooling system according to claim 5, characterized in that, The third communication channel includes: The second annular portion is disposed on the second back plate along the circumference of the second back plate, and the second annular portion is connected to the cooling chamber; An exhaust section is provided on the second back plate along the radial direction of the second annular portion, and the exhaust section is connected to the second annular portion.

7. A two-stage air-float air compressor cooling system according to claim 5, characterized in that, The two-stage air-float air compressor cooling system also includes: An exhaust passage extends through the housing and is connected to the third connecting passage; An exhaust port is provided on the housing and is connected to the exhaust channel.

Images