CN221257170U - Two-stage air-float air compressor - Google Patents

Abstract

The application provides a two-stage air-float air compressor, which belongs to the technical field of air compressors and comprises the following components: the device comprises a main shaft, a shell, a primary semi-open compression assembly and a secondary semi-open compression assembly; the stator, the shell and the main shaft are integrally designed, so that better heat conduction is realized, the heat dissipation of the air compressor is facilitated, the size and the weight of the whole air compressor can be reduced, and the air compressor is miniaturized; the first-stage semi-open compression assembly is used for carrying out first-stage compression on the gas and compressing the gas in the first-stage compression chamber to generate first-stage compressed gas; the second-stage semi-open compression assembly is used for carrying out secondary compression on gas, and secondary compression gas is generated by compression in the secondary compression chamber, and because the cooling chamber is communicated with the primary compression chamber, partial compression gas can be introduced into the shell assembly, the primary compression gas cools the shell, the main shaft and other internal components of the shell, and high-pressure air flow is utilized to take away heat generated by friction of operating parts of the air compressor, so that the service life of parts in the air compressor is prolonged.

Description

Two-stage air-float air compressor

Technical Field

The application belongs to the technical field of air compressors, and particularly relates to a two-stage air-float air compressor.

Background

At present, a centrifugal air compressor is generally designed in a permanent magnet motor direct drive mode, a motor rotor and a main shaft are made into an integrated structure, a centrifugal impeller is fixedly connected to the shaft end of the main shaft, the impeller is arranged in a volute, and under the ultrahigh-speed rotation of the rotor, the impeller drives gas to rotate at a high speed, and high-pressure and high-flow air is generated through interaction with the volute and supplied to a fuel cell engine. In order to improve the pressure and flow of the output air, the centrifugal air compressor often adopts a rotating speed control implementation mode with an ultrahigh rotating speed, however, the ultrahigh rotating speed can cause the air compressor to be incapable of rapidly cooling and radiating.

The patent application with the publication number of CN112761971A discloses a two-stage air foil bearing supporting high-speed centrifugal air compressor, copper pipes are distributed along the inner side wall of an inner shell, cooling air passages are formed in the copper pipes, the right ends of the copper pipes are communicated with a cooling air inlet joint, the shell is cooled by introducing cooling medium into the copper pipes, however, the cooling effect of the cooling structure is poor, a large amount of heat accumulated in the air compressor is still difficult to dissipate in time, and the normal operation of the air compressor is affected.

Disclosure of utility model

The present utility model aims to solve at least one of the technical problems existing in the prior art or related art.

In view of this, according to an embodiment of the present application, a two-stage air-floating air compressor is provided, including: the device comprises a main shaft, a shell, a primary semi-open compression assembly and a secondary semi-open compression assembly; the main shaft is provided with a stator; the shell is sleeved on the outer side of the stator, the inner wall surface of the shell is attached to the outer side wall of the stator, and a cooling cavity is formed in the cavity of the shell; the first-stage semi-open type compression assembly is arranged at the first end of the shell, a first-stage compression chamber is arranged in the first-stage semi-open type compression assembly, and the first-stage compression chamber is communicated with the shell so as to cool the interior of the shell, so that a cooling chamber is formed in the shell; the second-stage semi-open compression assembly is arranged at the second end of the shell, and a second-stage compression chamber is arranged in the second-stage semi-open compression assembly.

In one possible embodiment, the two-stage air compressor comprises: a heat sink; the heat radiating fins are arranged on the outer wall surface of the shell along the circumferential direction of the shell, and the heat radiating fins are arranged along the axial direction of the shell.

In one possible embodiment, the two-stage air compressor comprises: a cooling channel, a medium inlet and a medium outlet; the cooling channel is spirally arranged in the side wall of the shell along the circumferential direction of the shell; the medium inlet is arranged on the shell and is communicated with the cooling channel; the medium outlet is arranged on the shell and is communicated with the cooling channel.

In one possible embodiment, the two-stage air compressor comprises: a connecting pipe; the first end of connecting pipe is connected with the exhaust end of one-level compression cavity, and the second end of connecting pipe is connected with the second grade compression cavity air inlet to carry the compressed air in the one-level compression cavity to the second grade compression cavity in through the connecting pipe.

In one possible embodiment, the two-stage air compressor comprises: an exhaust passage and an exhaust port; the exhaust passage penetrates through the shell and is communicated with the cooling cavity; the exhaust port is arranged on the shell and is communicated with the exhaust channel.

In one possible embodiment, a primary semi-open compression assembly includes: the device comprises a thrust bearing assembly, a first backboard, a first impeller, a first volute, a first radial bearing assembly, a first communication channel and a second communication channel; the thrust bearing assembly is sleeved on the outer side of the main shaft and is connected with the shell; the first backboard is sleeved on the outer side of the main shaft and is connected with the thrust bearing assembly; the first impeller is sleeved on the outer side of the main shaft, the first impeller is connected with the main shaft, and the first impeller is positioned on one side of the first backboard away from the secondary compression chamber; a first-stage compression chamber is arranged in the first volute, the first volute is covered on the outer side of the first impeller, and the first volute is connected with the shell; the first radial bearing assembly is sleeved on the outer side of the main shaft, the first radial bearing assembly is connected with the thrust bearing assembly, the first radial bearing assembly is positioned on one side of the thrust bearing assembly, which is close to the second-stage semi-open compression assembly, and the first radial bearing assembly is positioned in the cooling cavity; the first communication channel is arranged on the thrust bearing assembly and is communicated with the first-stage compression chamber; the second communication channel is arranged on the first radial bearing assembly and is communicated with the first communication channel and the cooling chamber so as to enable the first-stage compression chamber to be communicated with the cooling chamber.

In one possible embodiment, a thrust bearing assembly includes: thrust bearing, thrust bearing pedestal and thrust disk; the thrust bearing is sleeved on the outer side of the main shaft; the thrust bearing seat is sleeved on the outer side of the main shaft and is connected with the shell; the thrust disk suit is in the outside of main shaft, and two thrust disks are connected with first backplate and thrust bearing seat respectively, and two thrust disks laminate with thrust bearing's two terminal surfaces respectively.

In one possible embodiment, the first radial bearing assembly comprises: the first radial bearing, the first bearing seat and the first gasket; the first radial bearing is sleeved on the outer side of the main shaft; the first bearing seat is sleeved on the outer side of the first radial bearing, and the first bearing seat is connected with the thrust bearing seat; the first gasket is arranged on the first bearing seat along the circumferential direction of the main shaft, and the first gasket is attached to the end face of the first radial bearing.

In one possible embodiment, the two-stage semi-open compression assembly comprises: the second back plate, the third communication channel, the second impeller, the second volute and the second radial bearing assembly; the second backboard is sleeved on the outer side of the main shaft and is connected with the shell; the third communication channel is arranged on the second backboard and is used for communicating the cooling cavity with the exhaust channel; the second impeller is sleeved on the outer side of the main shaft, the second impeller is connected with the main shaft, and the second impeller is positioned on one side of the second backboard away from the primary compression chamber; a second-stage compression chamber is arranged in the second volute, the second volute is covered on the outer side of the second impeller, and the second volute is connected with the shell; the second radial bearing assembly is sleeved on the outer side of the main shaft and fixed on the second back plate, the second radial bearing assembly is located on one side, close to the first-stage compression chamber, of the second back plate, and the second radial bearing assembly is located in the cooling chamber.

In one possible embodiment, the second radial bearing assembly comprises: a second radial bearing, a second bearing, and a second shim; the second radial bearing is sleeved on the outer side of the main shaft; the second bearing seat is sleeved on the outer side of the second radial bearing, and the second bearing seat is connected with the second backboard; the second gasket is arranged on the second bearing seat along the circumferential direction of the main shaft, and the second gasket is attached to the end face of the second radial bearing.

Compared with the prior art, the two-stage air-float air compressor has the beneficial effects that:

The casing suit is in the outside of stator, and stator, casing and main shaft adopt integrated design, heat conduction that can be better to help the air compressor machine heat dissipation, can also reduce whole machine size and weight, be favorable to the miniaturization of air compressor machine.

The first-stage semi-open compression assembly is used for carrying out first-stage compression on the gas and compressing the gas in the first-stage compression chamber to generate first-stage compressed gas; the second-stage semi-open compression assembly is used for carrying out secondary compression on gas, and secondary compression gas is generated by compression in the secondary compression chamber, and because the cooling chamber is communicated with the primary compression chamber, partial compression gas can be introduced into the shell assembly, the primary compression gas cools the shell, the main shaft and other internal components of the shell, and high-pressure air flow is utilized to take away heat generated by friction of operating parts of the air compressor, so that the service life of parts in the air compressor is prolonged.

The two-stage semi-open compression assembly is connected in series through the cooling chamber, so that the low-flow high-pressure ratio of the air compressor can be realized, the rotating speed range is enlarged, and the air compressor can reach a wide rotating speed range of 20000-120000 rpm.

Drawings

Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the application. Also, like reference numerals are used to designate like parts throughout the figures. In the drawings:

fig. 1 is a schematic structural diagram of a first angle of a two-stage air compressor according to an embodiment of the present application;

Fig. 2 is a schematic structural diagram of a second angle of a two-stage air compressor according to an embodiment of the present application;

FIG. 3 is an enlarged view at A of FIG. 1;

FIG. 4 is an enlarged view at B of FIG. 1;

wherein, the correspondence between the reference numerals and the component names in fig. 1 to 4 is:

110. A main shaft; 120. a stator; 130. a housing; 140. a first stage semi-open compression assembly; 150. a second stage semi-open compression assembly; 160. a first stage compression chamber; 170. a secondary compression chamber; 180. a cooling chamber; 210. a heat sink; 220. a cooling channel; 230. a medium inlet; 240. a medium outlet; 250. a connecting pipe; 260. an exhaust passage; 270. an exhaust port;

131. a thrust bearing assembly; 132. a first back plate; 133. a first impeller; 134. a first volute; 135. a first radial bearing assembly; 136. a first communication passage; 137. a second communication passage; 141. a second back plate; 142. a third communication passage; 143. a second impeller; 144. a second volute; 145. a second radial bearing assembly;

1311. A thrust bearing; 1312. thrust bearing seat; 1323. a thrust plate; 1351. a first radial bearing; 1352. a first bearing seat; 1353. a first gasket; 1451. a second radial bearing; 1452. a second bearing seat; 1453. and a second gasket.

Detailed Description

In the description of the present 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 orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present application.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present application, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.

In the present application, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art according to the specific circumstances.

The preferred embodiments of the present application will be described below with reference to the accompanying drawings, it being understood that the preferred embodiments described herein are for illustration and explanation of the present application only, and are not intended to limit the present application.

As shown in fig. 1, according to an embodiment of the present application, there is provided a two-stage air-floating air compressor, including: a main shaft 110, a housing 130, a primary semi-open compression assembly 140 and a secondary semi-open compression assembly 150; the main shaft 110 is provided with a stator 120; the casing 130 is sleeved on the outer side of the stator 120, the inner wall surface of the casing 130 is attached to the outer side wall of the stator 120, and a cooling cavity 180 is formed in the cavity of the casing 130; the first-stage semi-open compression assembly 140 is disposed at a first end of the housing 130, a first-stage compression chamber 160 is disposed in the first-stage semi-open compression assembly 140, and the first-stage compression chamber 160 is communicated with the housing 130 to cool the interior of the housing 130, so that a cooling chamber 180 is formed in the interior of the housing 130; the second stage semi-open compression assembly 150 is disposed at the second end of the housing 130, and a second stage compression chamber 170 is disposed within the second stage semi-open compression assembly 150.

The two-stage air-float air compressor provided by the embodiment of the application comprises a main shaft 110, a shell 130, a first-stage semi-open compression assembly 140 and a second-stage semi-open compression assembly 150; the shell 130 is sleeved on the outer side of the stator 120, and the stator 120, the shell 130 and the main shaft 110 are integrally designed, so that better heat conduction is realized, the heat dissipation of the air compressor is facilitated, the size and the weight of the whole air compressor can be reduced, and the miniaturization of the air compressor is facilitated; the first-stage semi-open compression assembly 140 is used for first-stage compression of gas and compression in the first-stage compression chamber 160 to generate first-stage compressed gas; the second-stage semi-open compression assembly 150 is used for performing second-stage compression on gas, and compressing in the second-stage compression chamber 170 to generate second-stage compressed gas, and since the cooling chamber 180 is communicated with the first-stage compression chamber 160, part of the compressed gas can be introduced into the casing assembly, the first-stage compressed gas cools the casing 130, the main shaft 110 and other internal components of the casing 130, and high-pressure air flow is utilized to take away heat generated by friction of operating parts of the air compressor, so that the service life of parts in the air compressor is prolonged.

Further, the air inlet end of the primary compression chamber 160 is disposed parallel to the axis of the main shaft 110, and the main stream air outlet end of the primary compression chamber 160 is disposed along the tangential direction of the housing 130; the intake end of the secondary compression chamber 170 is disposed parallel to the axis of the main shaft 110, and the exhaust end of the secondary compression chamber 170 is disposed in the tangential direction of the housing 130.

As shown in fig. 1 and 2, in one possible embodiment, a two-stage air-bearing air compressor includes: a heat sink 210; the heat sink 210 is disposed on an outer wall surface of the housing 130 in a circumferential direction of the housing 130, and the heat sink 210 is disposed in an axial direction of the housing 130.

In this technical scheme, because the inner wall of the casing 130 is closely attached to the outer side wall of the stator 120, the heat dissipation fins 210 are arranged on the outer surface of the casing 130, so that the air compressor can be further effectively assisted in rapid heat dissipation, and the normal operation of the air compressor is ensured.

Further, the heat dissipation fins 210 are equally spaced on the outer side wall of the housing 130 in the axial direction of the housing 130 to improve the uniformity of heat dissipation of the air compressor.

As shown in fig. 1 and 2, in one possible embodiment, a two-stage air-bearing air compressor includes: a cooling channel 220, a medium inlet 230, and a medium outlet 240; the cooling passage 220 is spirally provided inside the side wall of the housing 130 in the circumferential direction of the housing 130; a medium inlet 230 is provided on the housing 130, and the medium inlet 230 communicates with the cooling passage 220; the medium outlet 240 is provided on the housing 130, and the medium outlet 240 communicates with the cooling passage 220.

In this technical scheme, through offer the cooling channel 220 on casing 130 lateral wall, let in the cooling channel 220 through medium import 230 and cool off each part in casing 130 and the cooling cavity 180, further improve the cooling effect of air compressor machine to guarantee the running state of inside motor stator 120 of air compressor machine and its control circuit and rotor, realize the effective heat dissipation of air compressor machine.

As shown in fig. 2, in one possible embodiment, the two-stage air compressor includes: a connection pipe 250; a first end of the connection pipe 250 is connected to the discharge end of the primary compression chamber 160, and a second end of the connection pipe 250 is connected to the intake end of the secondary compression chamber 170 to transfer the compressed air in the primary compression chamber 160 into the secondary compression chamber 170 through the connection pipe 250.

In this embodiment, the primary compression chamber 160 and the secondary compression chamber 170 are simultaneously connected through the connection pipe 250 so that the primary compression chamber 160 communicates with the secondary compression chamber 170, and the primary compression gas in the primary compression chamber 160 is transferred into the secondary compression chamber 170 through the connection pipe 250 to secondarily compress the compression gas.

As shown in fig. 1 and 2, in one possible embodiment, a two-stage air-bearing air compressor includes: an exhaust passage 260 and an exhaust port 270; an exhaust passage 260 penetrates the housing 130, and the exhaust passage 260 communicates with the cooling chamber 180; an exhaust port 270 is provided on the housing 130, the exhaust port 270 being in communication with the exhaust passage 260.

In this technical scheme, through set up exhaust passage 260 on casing 130 lateral wall to set up gas vent 270 on casing 130 outer wall, so that the gas in the cooling chamber 180 is discharged from gas vent 270 through exhaust passage 260, prevent in the cooling chamber 180 gaseous backward flow to the one-level compression chamber 160, in order to guarantee that the mainstream gas in the one-level compression chamber 160 flows smoothly, thereby avoid cooling chamber 180 to get the gas in-process and cause the flow disorder, the air compressor efficiency that leads to declines, guarantees the steady operation of air compressor.

As shown in fig. 1 and 3, in one possible embodiment, the one-stage semi-open compression assembly 140 comprises: a thrust bearing assembly 131, a first backplate 132, a first impeller 133, a first volute 134, a first radial bearing assembly 135, a first communication passage 136, and a second communication passage 137; the thrust bearing assembly 131 is sleeved on the outer side of the main shaft 110, and the thrust bearing assembly 131 is connected with the shell 130; the first back plate 132 is sleeved on the outer side of the main shaft 110, and the first back plate 132 is connected with the thrust bearing assembly 131; the first impeller 133 is sleeved on the outer side of the main shaft 110, the first impeller 133 is connected with the main shaft 110, and the first impeller 133 is positioned on one side of the first back plate 132 away from the secondary compression chamber 170; the first volute 134 is internally provided with a first-stage compression chamber 160, the first volute 134 is covered on the outer side of the first impeller 133, and the first volute 134 is connected with the shell 130; the first radial bearing assembly 135 is sleeved on the outer side of the main shaft 110, the first radial bearing assembly 135 is connected with the thrust bearing assembly 131, the first radial bearing assembly 135 is positioned on one side of the thrust bearing assembly 131 close to the second-stage semi-open compression assembly 150, and the first radial bearing assembly 135 is positioned in the cooling chamber 180; the first communication passage 136 is provided on the thrust bearing assembly 131, and the first communication passage 136 communicates with the first stage compression chamber 160; the second communication passage 137 is provided on the first radial bearing assembly 135, and the second communication passage 137 communicates with both the first communication passage 136 and the cooling chamber 180 to communicate the primary compression chamber 160 with the cooling chamber 180.

In this solution, the first impeller 133 is fixed on the main shaft 110 and rotates synchronously with the main shaft 110, and by installing the first radial bearing assembly 135 and the thrust bearing assembly 131 on the main shaft 110, the first radial bearing assembly 135 bears the radial load of the main shaft 110 during rotation, and the thrust bearing assembly 131 bears the axial thrust of the main shaft 110 during rotation, so as to keep the relative position between the main shaft 110 and the stator 120 fixed; the first volute 134 is fixed at one end of the casing 130 and surrounds the first volute 134 to form a first-stage compression chamber 160, the first impeller 133 is located in the first-stage compression chamber 160 of the first volute 134, when the first impeller 133 rotates synchronously with the main shaft 110, first-stage compressed gas is generated in the first-stage compression chamber 160, the flow direction of the first-stage compressed gas is limited through the first communication channel 136 on the thrust bearing assembly 131 and the second communication channel 137 on the first radial bearing assembly 135, most of the first-stage compressed gas enters the second-stage compression chamber 170 through the first volute 134 to be secondarily compressed, and a small part of the first-stage compressed gas enters the cooling chamber 180 through the first communication channel 136 and the second communication channel 137 to cool the internal components of the casing 130.

Further, the first radial bearing 1351 and the thrust bearing 1311 are air suspension bearings, and high-pressure air generated by the first radial bearing 1351 and the thrust bearing 1311 forms an air film, so that friction between the bearing and the main shaft 110 is reduced, mechanical loss is reduced, and the service life of the air compressor is prolonged.

The first sealing ring is sleeved on the main shaft 110, and the first back plate 132 is sleeved on the outer side of the first sealing ring, so that a gap between the main shaft 110 and the first back plate 132 is sealed, and therefore primary compressed gas can only flow out from the main flow gas discharge end of the first communication channel 136 and the first volute 134, uniformity of gas in the cooling cavity 180 is guaranteed, and the cooling effect is improved.

As shown in fig. 1 and 3, in one possible embodiment, the thrust bearing assembly 131 includes: thrust bearing 1311, thrust bearing block 1312, and thrust disk 1323; thrust bearing 1311 is sleeved outside spindle 110; the thrust bearing seat is sleeved on the outer side of the main shaft 110, and the thrust bearing seat 1312 is connected with the shell 130; thrust disk 1323 is sleeved outside main shaft 110, two thrust disks 1323 are respectively connected with first back plate 132 and thrust bearing seat 1312, and two thrust disks 1323 are respectively attached to two end faces of thrust bearing 1311.

In this solution, the thrust bearing 1311 is sleeved on the main shaft 110, the thrust bearing seat 1312 is fixed on the housing 130, one thrust disc 1323 is fixed on the thrust bearing seat 1312, the other thrust disc 1323 is fixed on the first back plate 132, and the two thrust discs 1323 are respectively attached to two end faces of the thrust bearing 1311, so as to transfer the axial thrust of the main shaft 110 to the thrust bearing 1311, thereby preventing the main shaft 110 from generating axial displacement, and the casing, the stator 120 and the main shaft 110 are in an integrated structure, so that the thrust bearing 1311 is provided to reduce the tendency of deformation of the main shaft 110 and the casing, and prolong the service life of the air compressor.

As shown in fig. 1 and 3, in one possible embodiment, the first radial bearing assembly 135 comprises: a first radial bearing 1351, a first bearing seat 1352, and a first pad 1353; the first radial bearing 1351 is sleeved on the outer side of the main shaft 110; the first bearing seat 1352 is sleeved outside the first radial bearing 1351, and the first bearing seat 1352 is connected with the thrust bearing seat 1312; the first gasket 1353 is disposed on the first bearing seat 1352 along the circumferential direction of the main shaft 110, and the first gasket 1353 is attached to the end surface of the first radial bearing 1351.

In this technical scheme, first radial bearing 1351 suit is in the outside of main shaft 110, and first bearing frame 1352 is fixed on thrust bearing frame 1312, carries out radial spacing to first radial bearing through first bearing frame 1352, and then carries out radial spacing to main shaft 110, prevents that main shaft 110 from producing radial displacement, guarantees that main shaft 110 steadily rotates, further reduces main shaft 110 and the tendency of casing deformation, prolongs the life of air compressor machine.

As shown in fig. 1 and 4, in one possible embodiment, the two-stage semi-open compression assembly 150 comprises: a second back plate 141, a third communication channel 142, a second impeller 143, a second volute 144, and a second radial bearing assembly 145; the second back plate 141 is sleeved on the outer side of the main shaft 110, and the second back plate 141 is connected with the shell 130; the third communication channel 142 is disposed on the second back plate 141, and the third communication channel 142 is used for communicating the cooling chamber 180 with the exhaust channel 260; the second impeller 143 is sleeved on the outer side of the main shaft 110, the second impeller 143 is connected with the main shaft 110, and the second impeller 143 is positioned on one side of the second back plate 141 far away from the first-stage compression chamber 160; a secondary compression chamber 170 is arranged in the second volute 144, the second volute 144 is covered on the outer side of the second impeller 143, and the second volute 144 is connected with the shell 130; the second radial bearing assembly 145 is sleeved on the outer side of the main shaft 110 and fixed on the second back plate 141, and the second radial bearing assembly 145 is positioned on one side of the second back plate 141 close to the primary compression chamber 160, and the second radial bearing assembly 145 is positioned in the cooling chamber 180.

In this embodiment, the second impeller 143 is fixed to the main shaft 110 and rotates in synchronization with the main shaft 110, and the radial load of the main shaft 110 during rotation is borne by mounting the second radial bearing assembly 145 on the main shaft 110; the second scroll casing 144 is fixed at the other end of the housing 130 and surrounds the second scroll casing to form a second-stage compression chamber 170, the second impeller 143 is positioned in the second-stage compression chamber 170 of the second scroll casing 144, when the second impeller 143 rotates synchronously with the main shaft 110, the second-stage compression gas is formed in the second-stage compression chamber 170, and is discharged from an exhaust port 270 on the second scroll casing 144; the third communication channel 142 on the second back plate 141 limits the flow direction of the gas in the cooling chamber 180, so that the gas in the cooling chamber 180 is discharged from the exhaust channel 260 and the outside of the shell 130 through the third communication channel 142, and the exhaust function of the cooling chamber 180 is realized, so that the main flow gas in the first-stage compression chamber 160 is ensured to flow smoothly, the flow disorder caused in the gas taking process of the cooling chamber 180 is avoided, and the stable operation of the air compressor is ensured.

In this technical scheme, through setting up first impeller 133 and second impeller 143 respectively at the both ends of main shaft 110, at the in-process that the rotor drove two impeller rotations, the axial thrust of two impellers can offset each other, and then reduces thrust bearing 1311 applied axial force to reduce the interaction force between the part, be favorable to reducing the air compressor machine wearing and tearing, extension air compressor machine's life.

The second sealing ring is sleeved on the main shaft 110, and the second back plate 141 is sleeved on the outer side of the second sealing ring, so that a gap between the main shaft 110 and the second back plate 141 is sealed, gas in the cooling chamber 180 is prevented from entering the secondary compression chamber 170, turbulent airflow in the cooling chamber 180 and the secondary compression chamber 170 is prevented, and the working efficiency and stable operation of the air compressor are ensured.

It can be appreciated that the cooling chamber 180 is simultaneously communicated with the second communication channel 137 and the third communication channel 142, so that the primary compression chamber 160 is communicated with the secondary compression chamber 170, and further, the series connection of the primary semi-open compression assembly 140 and the secondary semi-open compression assembly 150 is realized, so that the low-flow high-pressure ratio of the air compressor is realized, and the rotating speed of the air compressor reaches a wide rotating speed range of 20000-120000 rpm.

As shown in fig. 1 and 4, in one possible embodiment, the second radial bearing assembly 145 comprises: a second radial bearing 1451, a second bearing seat 1452, and a second shim 1453; the second radial bearing 1451 is sleeved outside the main shaft 110; the second bearing seat 1452 is sleeved outside the second radial bearing 1451, and the second bearing seat 1452 is connected with the second back plate 141; the second shim 1453 is provided on the second bearing seat 1452 in the circumferential direction of the main shaft 110, and the second shim 1453 is attached to an end surface of the second radial bearing 1451.

In this technical scheme, second radial bearing 1451 suit is in the outside of main shaft 110, and second bearing seat 1452 is fixed on thrust bearing seat 1312, carries out radial spacing to the second bearing through second bearing seat 1452, and then carries out radial spacing to main shaft 110, prevents that main shaft 110 from producing radial displacement, guarantees that main shaft 110 steadily rotates, further reduces the tendency that main shaft 110 and casing warp, extension air compressor machine's life.

Further, the second radial bearing 1451 and the thrust bearing 1311 are air suspension bearings, and high-pressure air generated by the first radial bearing 1351 and the thrust bearing 1311 forms an air film, so that friction between the bearing and the main shaft 110 is reduced, mechanical loss is reduced, and the service life of the air compressor is prolonged.

It will be readily appreciated by those skilled in the art that the above advantageous ways can be freely combined and superimposed without conflict.

The foregoing description of the preferred embodiments of the application is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the application. The foregoing is merely a preferred embodiment of the present application, and it should be noted that it will be apparent to those skilled in the art that modifications and variations can be made without departing from the technical principles of the present application, and these modifications and variations should also be regarded as the scope of the application.

Claims (10)

1. The utility model provides a two-stage air compressor machine, its characterized in that, two-stage air compressor machine includes:

The main shaft is provided with a stator;

the shell is sleeved on the outer side of the stator, and the inner wall surface of the shell is attached to the outer side wall of the stator;

the first-stage semi-open type compression assembly is arranged at the first end of the shell, a first-stage compression chamber is arranged in the first-stage semi-open type compression assembly, and the first-stage compression chamber is communicated with the shell so as to cool the interior of the shell, so that a cooling chamber is formed in the shell;

The second-stage semi-open type compression assembly is arranged at the second end of the shell, and a second-stage compression chamber is arranged in the second-stage semi-open type compression assembly.

2. A two-stage air compressor as recited in claim 1, wherein the two-stage air compressor comprises:

And the cooling fins are arranged on the outer wall surface of the shell along the circumferential direction of the shell, and are arranged along the axial direction of the shell.

3. A two-stage air compressor as recited in claim 1, wherein the two-stage air compressor comprises:

A cooling passage that is provided in the interior of the side wall of the housing in a spiral shape along the circumferential direction of the housing;

The medium inlet is arranged on the shell and is communicated with the cooling channel;

And the medium outlet is arranged on the shell and is communicated with the cooling channel.

4. A two-stage air compressor as recited in claim 1, wherein the two-stage air compressor comprises:

The first end of the connecting pipe is connected with the exhaust end of the primary compression chamber, and the second end of the connecting pipe is connected with the air inlet end of the secondary compression chamber, so that compressed air in the primary compression chamber is conveyed into the secondary compression chamber through the connecting pipe.

5. The two-stage air compressor of claim 4, wherein the two-stage air compressor comprises:

An exhaust passage extending through the housing, the exhaust passage in communication with the cooling chamber;

And the exhaust port is arranged on the shell and is communicated with the exhaust channel.

6. The two-stage air compressor of claim 1, wherein the one-stage semi-open compression assembly comprises:

The thrust bearing assembly is sleeved on the outer side of the main shaft and is connected with the shell;

The first backboard is sleeved on the outer side of the main shaft and is connected with the thrust bearing assembly;

The first impeller is sleeved on the outer side of the main shaft, connected with the main shaft and located on one side, far away from the secondary compression chamber, of the first back plate;

The first volute is internally provided with the first-stage compression chamber, the first volute is covered on the outer side of the first impeller, and the first volute is connected with the shell;

The first radial bearing assembly is sleeved on the outer side of the main shaft, the first radial bearing assembly is connected with the thrust bearing assembly, the first radial bearing assembly is positioned on one side, close to the two-stage semi-open compression assembly, of the thrust bearing assembly, and the first radial bearing assembly is positioned in the cooling cavity;

A first communication passage provided on the thrust bearing assembly, the first communication passage communicating with the primary compression chamber;

And the second communication channel is arranged on the first radial bearing assembly and is communicated with the first communication channel and the cooling chamber so that the primary compression chamber is communicated with the cooling chamber.

7. The two-stage air compressor of claim 6 wherein the thrust bearing assembly comprises:

the thrust bearing is sleeved on the outer side of the main shaft;

The thrust bearing seat is sleeved on the outer side of the main shaft and is connected with the shell;

The thrust disc is sleeved on the outer side of the main shaft, the two thrust discs are respectively connected with the first back plate and the thrust bearing seat, and the two thrust discs are respectively attached to the two end faces of the thrust bearing.

8. The two-stage air compressor of claim 7 wherein the first radial bearing assembly comprises:

The first radial bearing is sleeved on the outer side of the main shaft;

The first bearing seat is sleeved on the outer side of the first radial bearing, and the first bearing seat is connected with the thrust bearing seat;

The first gasket is arranged on the first bearing seat along the circumferential direction of the main shaft, and the first gasket is attached to the end face of the first radial bearing.

9. The two-stage air compressor of claim 5 wherein the two-stage semi-open compression assembly comprises:

The second backboard is sleeved on the outer side of the main shaft and is connected with the shell;

A third communication channel provided on the second back plate, the third communication channel being used for communicating the cooling chamber with the exhaust channel;

The second impeller is sleeved on the outer side of the main shaft, connected with the main shaft and positioned on one side of the second back plate far away from the primary compression chamber;

The second volute is internally provided with the two-stage compression chamber, the second volute is covered on the outer side of the second impeller, and the second volute is connected with the shell;

the second radial bearing assembly is sleeved on the outer side of the main shaft and fixed on the second back plate, the second radial bearing assembly is located on one side, close to the first-stage compression chamber, of the second back plate, and the second radial bearing assembly is located in the cooling chamber.

10. The two-stage air compressor of claim 9 wherein the second radial bearing assembly comprises:

the second radial bearing is sleeved on the outer side of the main shaft;

The second bearing seat is sleeved on the outer side of the second radial bearing, and the second bearing seat is connected with the second backboard;

The second gasket is arranged on the second bearing seat along the circumferential direction of the main shaft, and the second gasket is attached to the end face of the second radial bearing.