A bearing zone with independent bearing cavities

Abstract

The application discloses a bearing area with independent bearing cavity and relates to the technical field of compressors, which is mainly characterized in that a bearing cavity is formed by connecting a flow guide cover with an inlet casing assembly to provide an independent cavity structure on the air intake side for supporting bearings, avoid direct impact of air intake on the bearings, and avoid the influence of air intake on oil discharge and air exhaust of the bearing area, so that the oil discharge and air exhaust are smoother, lubricating oil and oil fume are prevented from entering the compressor, and the medium in the compressor is prevented from being polluted. The main technical scheme of the application is as follows: a bearing area with independent bearing cavity, comprising: an inlet casing assembly, which forms an air intake cavity; a flow guide cover, which is located in the air intake cavity of the inlet casing assembly and is connected with the inlet casing assembly, and a bearing cavity is formed between the flow guide cover and the inlet casing assembly, and the bearing cavity is used for mounting supporting bearings.

Description

Technical Field

[0001] This invention relates to the field of compressor technology, and more particularly to a bearing area with an independent bearing cavity. Background Technology

[0002] In order to reduce the losses in the intake volute, the low-pressure section compressor of a large compressed air energy storage project usually adopts an axial intake design structure, and the intake side bearing area needs to be arranged in the intake chamber.

[0003] There is no effective structure for protecting the bearing in the existing technology. The intake air flows directly towards the bearing, causing direct impact on the bearing. The oil and gas discharge in the bearing area will be directly affected by the intake air. On the one hand, it will lead to poor oil and gas discharge. On the other hand, the oil and gas will flow into the compressor flow channel with the intake air, affecting the compressor performance. Summary of the Invention

[0004] In view of this, in order to solve at least one of the above-mentioned technical problems, the present invention provides a bearing region with an independent bearing cavity.

[0005] To achieve the above objectives, the present invention mainly provides the following technical solutions: This invention provides a bearing region with an independent bearing cavity, comprising: Imported housing components form the air intake chamber; The air deflector is located in the air intake cavity of the inlet housing assembly and is connected to the inlet housing assembly. The air deflector and the inlet housing assembly form a bearing cavity, which is used to install the support bearing.

[0006] The fairing is opposite to the axial air inlet on one side of the air inlet chamber, and the cross-sectional area of ​​the outer contour of the fairing decreases in the direction close to the axial air inlet.

[0007] The imported housing assembly is equipped with an oil drain channel and an oil supply channel. The imported housing assembly also constitutes an oil inlet chamber, which is located in the bearing cavity and is used to connect to the support bearing. The oil supply channel connects to the outside of the inlet housing assembly and the oil inlet chamber, and the oil discharge channel connects to the outside of the inlet housing assembly and the bearing cavity; The oil drain channel is located on the side of the oil supply channel near the axial air inlet of the inlet housing assembly.

[0008] The bearing area with an independent bearing cavity also includes: The bearing housing assembly is located in the bearing cavity and is connected to the inlet housing assembly. The bearing housing assembly and the inlet housing assembly form a sub-cavity, which is used to install and support the bearing. The bearing housing assembly is connected to a smoke exhaust pipe, and the inlet housing assembly is provided with a smoke exhaust channel. The smoke exhaust pipe is connected to the side of the bearing housing assembly facing the axial air inlet of the inlet housing assembly and is located outside the sub-cavity and inside the bearing cavity. The first end of the exhaust pipe is connected to the sub-cavity, and the second end of the exhaust pipe is opposite to the exhaust channel, which is connected to the outside of the inlet housing assembly and the bearing cavity.

[0009] The bearing housing assembly includes an imported bearing housing cover and an imported bearing housing side plate. The imported bearing housing cover is connected to the imported housing assembly through the imported bearing housing side plate, and the exhaust pipe is connected to the imported bearing housing cover.

[0010] The bearing area with an independent bearing cavity also includes: An oil baffle is located in the sub-cavity and is connected to the bearing housing assembly; The oil baffle plate is axially opposite to the first end inlet of the exhaust pipe in the inlet housing assembly, and is spaced apart from the first end inlet of the exhaust pipe.

[0011] The height of the first end of the exhaust pipe is higher than the axis of the imported housing assembly.

[0012] The imported housing assembly is also equipped with a condensate venting channel, which runs through the bearing cavity and the outside of the imported housing assembly. The condensate venting channel is located on the side of the axial air inlet of the imported housing assembly opposite to the bearing housing assembly.

[0013] The bearing area with an independent bearing cavity also includes: The inlet-side oil seal connects the bearing housing assembly and the inlet housing assembly, and is used to connect with the rotor. The inlet-side oil seal includes an oil retainer ring, which is located at one end of the inlet-side oil seal near the axial air inlet of the inlet housing assembly. The oil retainer ring extends in a direction perpendicular to the axis of the inlet housing assembly.

[0014] The bearing area with an independent bearing cavity also includes: The rotor front section is used to connect to the support bearing. The rotor front section is provided with an outwardly protruding shaft boss, which is spaced apart from the inlet side oil seal. The shaft boss is located between the inlet side oil seal and the support bearing.

[0015] This invention proposes a bearing area with an independent bearing cavity. The bearing cavity is formed by connecting the guide shroud to the inlet housing assembly. The supporting bearing is located in the bearing cavity, which realizes the independent cavity structure on the air intake side of the bearing. The independent bearing area is isolated from the external air intake chamber, avoiding direct impact of the air intake on the bearing. The oil and gas discharge of the bearing area is not affected by the air intake, and the oil and gas discharge is smoother. It also prevents lubricating oil and oil fumes from entering the compressor and contaminating the medium inside the compressor. Attached Figure Description

[0016] Figure 1 A cross-sectional view of a centrifugal compressor with an independent bearing cavity in a bearing area provided for an embodiment of the present invention; Figure 2 A cross-sectional view of a first partial structure of a bearing region with an independent bearing cavity, provided in an embodiment of the present invention; Figure 3 This is a cross-sectional schematic diagram of a second partial structure of a bearing region with an independent bearing cavity, provided as an embodiment of the present invention.

[0017] The components include: stator 110, imported housing assembly 120, imported housing 121, support column 122, upper inner shell of imported housing 123, flange 124, axial air inlet 101, bearing cavity 102, oil drain channel 103, oil supply channel 104, sub-cavity 105, smoke exhaust channel 106, condensate exhaust channel 107, air outlet 108, rotor 200, rotor front area 210, shaft boss 220, support bearing 300, support bearing cover 310, thrust bearing 400, guide shroud 500, smoke exhaust pipe 600, bearing box assembly 700, imported bearing box top cover 710, imported bearing box side plate 730, oil baffle 800, imported side oil seal 900, oil baffle ring 910, annular cavity 911, puller seal 1000, and main sealing gas injection port 1001. Detailed Implementation

[0018] To further illustrate the technical means and effects adopted by the present invention to achieve the intended purpose, the following detailed description, in conjunction with the accompanying drawings and preferred embodiments, details the specific implementation, structure, features, and effects of the bearing area with an independent bearing cavity proposed according to the present invention.

[0019] like Figures 1-3 As shown, an embodiment of the present invention provides a bearing region with an independent bearing cavity, comprising: Imported housing assembly 120, the imported housing assembly 120 constitutes the air intake chamber; The air deflector 500 is located in the air intake cavity of the inlet housing assembly 120 and is connected to the inlet housing assembly 120. The air deflector 500 and the inlet housing assembly 120 form a bearing cavity 102, which is used to install the support bearing 300.

[0020] Bearing sections with independent bearing cavities can be used in centrifugal compressors, such as... Figure 1As shown, the following text will describe various embodiments of the bearing area with an independent bearing cavity in conjunction with a centrifugal compressor. The inlet housing assembly 120 also forms an axial air inlet 101 communicating with the air inlet chamber. The axial air inlet 101 allows air to enter along the axial direction of the inlet housing assembly 120, while the outlet air of the centrifugal compressor can be volute air. For example... Figure 1 The diagram shows a usage scenario of a bearing area with an independent bearing cavity, with the centrifugal compressor's outlet 108 discharging air radially.

[0021] When the bearing area with independent bearing cavities is in use, it is connected to the stator 110 of the compressor. The stator 110 includes an outlet volute and a bend, which connects the inlet chamber and the outlet volute of the inlet housing assembly 120. When the bearing area with independent bearing cavities is in use, the inlet housing assembly 120 carries the support bearing 300. One end of the rotor 200 of the centrifugal compressor is supported and precisely centered by the support bearing 300. The rotor 200 consists of a main shaft and multiple impellers connected in series on it. The impellers correspond to the bend, and the rotor 200 rotates at high speed. Gas enters through the axial inlet 101 under the push of the impellers. The impellers drive the gas to rotate at high speed, generating centrifugal force. The gas diffuses and flows in the bend, gradually increasing the gas velocity and pressure, continuously producing high-pressure compressed air, which then flows out after being decelerated and diffused through the outlet volute.

[0022] Support bearings 300 are used to support and position the rotor 200. There are two support bearings 300, each supporting the rotor 200 from both ends, allowing the rotor 200 to rotate relative to the stator 110. In this application, the support bearing 300 installed in the bearing cavity 102 refers to the front support bearing 300, i.e., the bearing near the axial air inlet 101, while the rear support bearing 300 is the bearing near the air outlet 108. The support bearing 300 can be a tilting pad bearing. In some embodiments, a thrust bearing 400 is also provided on the side of the rear support bearing 300 away from the axial air inlet 101. It should be noted that the support bearing 300 mentioned below refers to the front support bearing 300, i.e., the support bearing 300 located in the bearing cavity 102, and will not be described individually thereafter.

[0023] The structure of the inlet housing assembly 120 can vary, as long as it cooperates with the diffuser 500 to provide an independent chamber for the support bearing 300. In one embodiment, the inlet housing assembly 120 of the stator 110 further includes an inlet housing 121, a support column 122, and an upper inner shell 123. The inlet housing 121 is approximately cylindrical, with its inner diameter increasing near the axial air inlet 101. The inlet housing 121 forms both the air inlet chamber and the axial air inlet 101. The support column 122 is located below the interior of the inlet housing 121, extending upwards. The support bearing 300 is connected to the support column 122, which supports the support bearing 300 and provides a channel, as will be described in further detail below. The upper inner shell 123 of the inlet housing has an upwardly curved arc structure. The upper inner shell 123 is connected to the support column 122, forming a space between them. This space has a front opening and a rear opening in the axial direction of the stator 110. A flow guide 500 covers the front opening, while the rotor 200 extends through the rear opening between the upper inner shell 123 and the support column 122, and then is inserted into the support bearing 300. Figure 3 As shown, a pulley seal 1000 is provided between the rotor 200 and the stator 110, or between the rotor 200 and the rear opening edge formed by the upper inner shell 123 of the inlet housing and the support column 122. In some embodiments, the inlet housing assembly 120 also includes a flange 124 connected to the edge of the axial air inlet 101.

[0024] Thus, the imported housing assembly 120 and the guide shroud 500 form an independent chamber, the bearing cavity 102, located inside the imported housing assembly 120. The outer wall of the independent chamber supports the bearing 300 and blocks the airflow, while the inner wall of the independent chamber can guide the lubricating oil out, thus isolating the intake air from the leaked lubricating oil and fumes.

[0025] The present invention proposes a bearing area with an independent bearing cavity, which is connected to the inlet housing assembly through a guide shroud to form the bearing cavity. The supporting bearing is located in the bearing cavity, thereby providing an independent cavity structure on the air intake side of the bearing. The independent bearing area is isolated from the external air intake chamber, avoiding direct impact of the air intake on the bearing. The oil and gas discharge of the bearing area is not affected by the air intake, and the oil and gas discharge is smoother. This prevents lubricating oil and oil fumes from entering the compressor and contaminating the medium inside the compressor.

[0026] The shape of the fairing 500 can be various. For example, in one embodiment, the fairing 500 is opposite to the axial air inlet 101, and the cross-sectional area of ​​the outer contour of the fairing 500 decreases in the direction close to the axial air inlet 101.

[0027] The air deflector 500 covers only the area relative to the axial air inlet 101, as described above, covering the front opening. The air deflector 500 has a smooth, outward-protruding arc-shaped transition structure relative to the axial air inlet 101. This arc-shaped design effectively reduces flow resistance, minimizes flow loss, ensures air intake, and guarantees compressor efficiency. Furthermore, the connection between the air deflector 500 and the inlet housing assembly 120 also uses a smooth arc surface transition, thereby reducing wind resistance. In some embodiments, the air deflector 500 may be made of a more wear-resistant material than the inlet housing assembly 120, thereby increasing the service life of the air deflector 500.

[0028] In one embodiment, the bearing area with an independent bearing cavity further includes a bearing housing assembly 700, which is located in the bearing cavity 102 and connected to the inlet housing assembly 120. The bearing housing assembly 700 and the inlet housing assembly 120 form a sub-cavity 105, which is used to install the support bearing 300.

[0029] The bearing housing assembly 700 can be connected to the support column 122 of the aforementioned embodiment. The sub-cavity 105 is a chamber within the bearing cavity 102 formed by the bearing housing assembly 700 and the support column 122; that is, the bearing cavity 102 includes the sub-cavity 105, or the sub-cavity 105 is located within the bearing cavity 102. A through-hole is formed between the bearing housing assembly 700 and the support column 122, and the rotor 200 extends into the sub-cavity 105 through the through-hole and connects with the support bearing 300 within the sub-cavity 105.

[0030] The bearing housing assembly 700 can have various structures, such as in one embodiment, like... Figure 2 As shown, the bearing housing assembly 700 includes an imported bearing housing cover 710 and an imported bearing housing side plate 730. The imported bearing housing cover 710 is connected to the imported housing assembly 120 through the imported bearing housing side plate 730.

[0031] The imported bearing housing side plate 730 is positioned opposite the axial air inlet 101, and the imported bearing housing top cover 710 and the imported bearing housing side plate 730 can be bolted together. In one embodiment, the bearing area with an independent bearing cavity further includes a supporting bearing cover 310, which is located between the imported bearing housing top cover 710 and the supporting bearing 300, thereby fixing the supporting bearing 300. The bearing housing assembly 700 includes a separate structure of the imported bearing housing top cover 710 and the imported bearing housing side plate 730, facilitating installation.

[0032] In one embodiment, the inlet housing assembly 120 is provided with an oil drain channel 103 and an oil supply channel 104. The inlet housing assembly 120 also forms an oil inlet chamber located in the bearing cavity 102. The oil inlet chamber is used to connect and support the bearing 300. The oil supply channel 104 connects the outside of the stator 110 and the oil inlet chamber. The oil drain channel 103 connects the outside of the inlet housing assembly 120 and the bearing cavity 102. The oil drain channel 103 is located on the side of the oil supply channel 104 opposite to the axial air inlet 101.

[0033] The oil inlet chamber is used to supply lubricating oil to the support bearing 300. In embodiments including the support column 122, both the oil drain channel 103 and the oil supply channel 104 are vertically extending channels located on the support column 122. The oil drain channel 103 communicates with a sub-cavity 105 within the bearing cavity 102, meaning the top opening of the oil drain channel 103 is located on the bottom wall of the sub-cavity 105. The oil supply channel 104 is used to supply lubricating oil between the support bearing 300 and the inlet housing assembly 120, while the oil drain channel 103 is used to drain dripping lubricating oil. This allows the oil inlet and outlet of the support bearing 300 to be led from inside the bearing cavity 102 to outside the inlet housing assembly 120, reducing lubricating oil leakage points.

[0034] In one embodiment, a smoke exhaust pipe 600 is connected to the bearing housing assembly 700, and a smoke exhaust channel 106 is provided on the inlet housing assembly 120. The smoke exhaust pipe 600 is connected to the side of the bearing housing assembly 700 facing the axial air inlet 101 and is located outside the sub-cavity 105 and inside the bearing cavity 102. The first end of the smoke exhaust pipe 600 communicates with the sub-cavity 105, and the second end of the smoke exhaust pipe 600 is opposite to the smoke exhaust channel 106. The smoke exhaust channel 106 communicates with the outside of the inlet housing assembly 120 and the bearing cavity 102.

[0035] For example, the exhaust pipe 600 is connected to the upper cover 710 of the inlet bearing housing. The exhaust pipe 600 is an L-shaped pipe, with its upper end inserted into the side wall of the upper cover 710 of the inlet bearing housing relative to the axial air inlet 101, and then communicating with the sub-cavity 105, and its lower end extending vertically downward. The exhaust channel 106 is configured as a channel opened on the support column 122 and extending vertically, with the top opening of the exhaust channel 106 located outside the sub-cavity 105, on the bottom wall of the bearing cavity 102. The bottom end of the exhaust pipe 600 corresponds vertically to the top opening of the exhaust channel 106, or the bottom end of the exhaust pipe 600 can be inserted into the exhaust channel 106, thereby guiding the oil fumes to the outside of the inlet housing assembly 120.

[0036] In one embodiment, the bearing area with an independent bearing cavity further includes an oil baffle 800, which is located in the sub-cavity 105 and connected to the bearing housing assembly 700. A portion of the structure of the oil baffle 800 is axially opposite to the first end inlet of the exhaust pipe 600 in the inlet housing assembly 120 and is spaced apart from the first end inlet of the exhaust pipe 600.

[0037] The oil baffle 800 has a bent structure, including a base plate and a side plate, which are vertically connected. The base plate is connected to the side wall of the inlet bearing housing cover 710 of the bearing housing assembly 700 and is located below the exhaust pipe 600. The side plate corresponds axially to the inlet of the exhaust pipe 600. As a result, the oil in the fumes will be blocked by the oil baffle 800, preventing lubricating oil from splashing into the exhaust pipe 600, ensuring oil and fume separation, preventing excessive oil accumulation in the exhaust pipe 600, and ensuring smooth exhaust.

[0038] In one embodiment, the height of the first end of the exhaust pipe 600 is higher than the axis of the inlet housing assembly 120.

[0039] The inlet of the exhaust pipe 600 is set at a high position to reduce the probability of lubricating oil splashing into the exhaust pipe 600, and the oil fumes flow upward, so they can enter the exhaust pipe 600 more smoothly.

[0040] In one embodiment, the inlet housing assembly 120 is further provided with a condensate draining channel 107, which passes through the bearing cavity 102 and the outer side of the inlet housing assembly 120. The condensate draining channel 107 is located on the side opposite to the axial air inlet 101 of the bearing housing assembly 700.

[0041] The condensate drainage channel 107 is formed on the support column 122, and the condensate drainage channel 107 may include an inclined extension section and a vertical extension section. The inclined extension section is located above the vertical extension section and communicates with the vertical extension section. The top opening of the condensate drainage channel 107 is located outside the sub-cavity 105, on the bottom wall of the bearing cavity 102, and on the side of the sub-cavity 105 away from the axial air inlet 101.

[0042] In one embodiment, the bearing area with an independent bearing cavity further includes an inlet-side oil seal 900, which is located between the rotor 200 and the bearing housing assembly 700 and between the rotor 200 and the inlet housing assembly 120.

[0043] The bearing housing cover 710 of the bearing housing assembly 700 forms a through-hole between the bearing housing cover 710 and the support column 122 at the position where it passes through the rotor 200. The through-hole is used for the rotor 200 to pass through. The inlet-side oil seal 900 is connected to the edge of the through-hole and is located between the through-hole and the rotor 200. Figure 3 As shown, the inlet-side oil seal 900 can be a comb-tooth seal. The inlet-side oil seal 900 is used to prevent lubricating oil from leaking into the sub-cavity 105 on the side opposite to the compressor interior.

[0044] The inlet side oil seal 900 includes an oil retainer ring 910, which is located at one end of the inlet side oil seal 900 near the axial air inlet 101. The oil retainer ring 910 extends away from the rotor 200 in a direction perpendicular to the axis of the inlet housing assembly 120.

[0045] The oil baffle ring 910 serves to block lubricating oil. Together with the comb seal, the oil baffle ring 910 prevents lubricating oil from entering the compressor. The oil baffle ring 910 forms an annular cavity 911 on one side of the opposite axial intake port 101. The blocked lubricating oil flows into the annular cavity 911 through the side wall of the bearing housing assembly 700, and then slides down the annular cavity 911 and drips.

[0046] To further block lubricating oil, in one embodiment, the bearing area with an independent bearing cavity further includes: a rotor front area 210, on which a protruding shaft boss 220 is provided, the shaft boss 220 is spaced apart from the inlet side oil seal 900, and the shaft boss 220 is located between the inlet side oil seal 900 and the support bearing 300.

[0047] The rotor front section 210 is part of the rotor structure, used to connect to the support bearing 300. In use, the rotor front section 210 is connected to the rotor body of the centrifugal compressor to form a complete rotor 200. The shaft boss 220 is located near the oil baffle ring 910 and is axially positioned between it and the oil baffle ring 910, with the gap being only a slit. The shaft boss 220 is a ring-shaped protruding structure extending radially outward. The height of the shaft boss 220 can correspond axially to the inner ring of the oil baffle ring 910, thereby cooperating with the oil baffle ring 910 to block lubricating oil in the axial direction, especially providing a good blocking effect for lubricating oil flowing along the rotor 200.

[0048] The shaft boss 220 can be a flat surface perpendicular to the axis on one side relative to the axial air inlet 101, while the side opposite to the axial air inlet 101 can be an arc-shaped or sloping surface. This can more effectively block lubricating oil on one side of the axial air inlet 101. The shaft boss 220 occupies little space and has good structural stability.

[0049] In some embodiments, where a pulley seal 1000 is provided between the aforementioned rotor 200 and the inlet housing assembly 120, the pulley seal 1000 provides a further seal relative to the inlet-side oil seal 900. For example... Figure 3 As shown, the inlet housing assembly 120, or support column 122, has a main sealing air injection port 1001 at the Labellen seal 1000. By injecting dry instrument air at a pressure slightly higher than the compressor air, a small amount of lubricating oil that has bypassed the inlet side oil seal 900 is effectively prevented from entering the compressor interior. The lubricating oil blocked by the Labellen seal 1000 will flow downwards along the side wall, allowing the small amount of lubricating oil that has overflowed past the inlet side oil seal 900 to be discharged through the condensate drain channel 107.

[0050] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of protection of the present invention.

Claims

1. A bearing region with an independent bearing cavity, characterized in that, include: An imported housing assembly (120) forms an air intake chamber; A fairing (500) is located in the air intake cavity of the inlet housing assembly (120) and is connected to the inlet housing assembly (120). A bearing cavity (102) is formed between the fairing (500) and the inlet housing assembly (120). The bearing cavity (102) is used to install a support bearing (300).

2. The bearing region with an independent bearing cavity according to claim 1, characterized in that, The air deflector (500) is opposite to the axial air inlet (101) on one side of the air inlet chamber, and the cross-sectional area of ​​the outer contour of the air deflector (500) decreases in the direction close to the axial air inlet (101).

3. The bearing region with an independent bearing cavity according to claim 1, characterized in that, The inlet housing assembly (120) is provided with an oil drain channel (103) and an oil supply channel (104). The inlet housing assembly (120) also forms an oil inlet chamber, which is located in the bearing cavity (102) and is used to connect the support bearing (300). The oil supply channel (104) is connected to the outside of the inlet housing assembly (120) and the oil inlet chamber, and the oil discharge channel (103) is connected to the outside of the inlet housing assembly (120) and the bearing cavity (102). The oil drain channel (103) is located on the side of the oil supply channel (104) near the axial air inlet (101) of the inlet housing assembly (120).

4. The bearing region with an independent bearing cavity according to claim 1, characterized in that, The bearing area with an independent bearing cavity also includes: A bearing housing assembly (700) is located in the bearing cavity (102) and connected to the inlet housing assembly (120). The bearing housing assembly (700) and the inlet housing assembly (120) form a sub-cavity (105), which is used to install the support bearing (300). The bearing housing assembly (700) is connected to a smoke exhaust pipe (600), and the inlet housing assembly (120) is provided with a smoke exhaust channel (106). The smoke exhaust pipe (600) is connected to the side of the bearing housing assembly (700) facing the axial air inlet (101) of the inlet housing assembly (120), and is located outside the sub-cavity (105) and inside the bearing cavity (102). The first end of the exhaust pipe (600) is connected to the sub-cavity (105), and the second end of the exhaust pipe (600) is opposite to the exhaust channel (106). The exhaust channel (106) is connected to the outside of the inlet housing assembly (120) and the bearing cavity (102).

5. The bearing region with an independent bearing cavity according to claim 4, characterized in that, The bearing housing assembly (700) includes an imported bearing housing cover (710) and an imported bearing housing side plate (730). The imported bearing housing cover (710) is connected to the imported housing assembly (120) through the imported bearing housing side plate (730). The exhaust pipe (600) is connected to the imported bearing housing cover (710).

6. The bearing region with an independent bearing cavity according to claim 4, characterized in that, The bearing area with an independent bearing cavity also includes: An oil baffle (800) is located in the sub-cavity (105) and connected to the bearing housing assembly (700); A portion of the structure of the oil baffle (800) is axially opposite to the first end inlet of the exhaust pipe (600) in the inlet housing assembly (120), and is spaced apart from the first end inlet of the exhaust pipe (600).

7. The bearing region with an independent bearing cavity according to claim 4, characterized in that, The height of the first end of the exhaust pipe (600) is higher than the axis of the inlet housing assembly (120).

8. The bearing region with an independent bearing cavity according to claim 4, characterized in that, The inlet housing assembly (120) is also provided with a condensate drain channel (107), which runs through the bearing cavity (102) and the outer side of the inlet housing assembly (120). The condensate drain channel (107) is located on the side of the bearing housing assembly (700) opposite to the axial air inlet (101) of the inlet housing assembly (120).

9. The bearing region with an independent bearing cavity according to claim 4, characterized in that, The bearing area with an independent bearing cavity also includes: An inlet side oil seal (900) is connected to the bearing housing assembly (700) and the inlet housing assembly (120), and the inlet side oil seal (900) is used to connect to the rotor (200); The inlet side oil seal (900) includes an oil baffle ring (910), which is disposed at one end of the inlet side oil seal (900) near the axial air inlet (101) of the inlet housing assembly (120), and the oil baffle ring (910) extends in a direction perpendicular to the axis of the inlet housing assembly (120).

10. The bearing region with an independent bearing cavity according to claim 9, characterized in that, The bearing area with an independent bearing cavity also includes: The rotor front area (210) is used to connect to the support bearing (300). The rotor front area (210) is provided with an outwardly protruding shaft boss (220). The shaft boss (220) is spaced apart from the inlet side oil seal (900). The shaft boss (220) is located between the inlet side oil seal (900) and the support bearing (300).

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