Compressor inlet chamber structure with bearing cavity

Abstract

The application belongs to the technical field of compressor intake chamber, and provides a multifunctional centrifugal compressor intake chamber assembly structure integrated with bearing cavity. Two inlets are arranged at the inlet of the intake cover shell, which are respectively intake port 1 and intake port 2. The intake port 1 can accept atmospheric environment intake, and the intake port 2 can accept ring control bleed air. The bearing cavity is arranged at one end of the intake cover shell, and the connecting flange is arranged at the other end. The intake chamber assembly structure can provide the following three functions for the APU and small power device: 1. front and rear end support connection, load transmission through the integrated design of the intake support structure, avoiding the complex structure response problem of the multi-component load transmission system design; 2. bearing support structure, the bearing is coupled with the oil distribution function, lubrication function, sealing structure, and the speed measuring wheel for speed measurement is integrated; 3. double-inlet intake control can realize multiple working modes. The assembly structure is simple, and is suitable for compact APU and small power device.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of compressor intake chamber, and particularly relates to a compressor intake chamber structure with a bearing cavity. BACKGROUND

[0002] Centrifugal compressors are widely used in small power devices, APUs and turbochargers due to their high single-stage pressure ratio, reliable structure and other characteristics. For APUs, an intake chamber assembly needs to be arranged in front of the centrifugal compressor. The intake chamber in front of the compressor has an important influence on the flow of the compressor. When the flow distortion is large, the working condition of the compressor becomes poor, and the working range becomes narrow and the vibration becomes too large. The intake chamber inlet is provided with an intake damper assembly to control the closing of the intake port. The traditional APU intake chamber generally surrounds a specific area by a thin-walled structure through spinning to form a main intake chamber space, the total pressure recovery coefficient of the intake is low, and the intake distortion is large. Its technical approach is to open a side of the intake chamber outer wall to connect the intake damper to control the intake state. The intake chamber is often an accessory part of the APU, without load transmission and other functions. In the traditional compressor design, the load transmission is often through multiple components. Due to the effects of thermal load and mechanical load in the transient condition process, the design of the multiple component system makes the structural response complex and difficult to predict. The integrated intake chamber assembly integrates the related functions near the intake into one assembly, has the functions of supporting, transmitting load and arranging bearings, greatly simplifies the number of parts and facilitates size matching, and the manufacturing method can be selected from casting or 3D printing, etc. The manufacturing is convenient, the structure is compact, and the application value is high. SUMMARY

[0003] The purpose of the application is to simplify the structure of the intake part of the small power device, integrate the bearing cavity structure, the rotational speed measurement structure, the front and rear end load transmission and connection functions, and set two different working mode inlets, namely the intake port 1 and the intake port 2. The application realizes a multifunctional centrifugal compressor intake chamber structure, and realizes the integration and simplification of the structure and the function.

[0004] The technical scheme of the application is as follows:

[0005] A compressor intake chamber structure with a bearing cavity, comprising: an intake support shell 4, a flow guide cover 3, a graphite seal 5, a bearing seat 6, an outer ring bushing 7, an inner ring bushing 8, a roller bearing 9, an end cover 10, a speed measuring wheel 11, a transmission shaft sleeve 13, an L-shaped sealing gasket 15 and a sealing ring 14.

[0006] The intake support shell 4 comprises an integrally formed cylindrical intake shell, a funnel-shaped bearing cavity, a first intake port and a second intake port.

[0007] The large end of the bearing cavity is connected with the front end of the intake shell, and the rear end of the intake shell is connected with the flow guide cover 3.

[0008] The fairing 3 is trumpet-shaped, and the outer edge of the fairing 3 is provided with a flange edge which is screwed with the rear end of the air inlet support shell 4;

[0009] The first air inlet and the second air inlet on the air inlet support shell 4 have an included angle of 70°-120°.

[0010] Further, the structure further comprises a transmission shaft sleeve 13, a bearing seat 6 and a roller bearing 9;

[0011] The bearing seat 6 is installed in the bearing cavity of the air inlet support shell 4 through interference fit with the shaft;

[0012] The roller bearing 9 is installed in the bearing seat 6, and the transmission shaft sleeve 13 is sleeved in the roller bearing 9.

[0013] Further, the transmission shaft sleeve 13 is a stepped shaft, and the transmission shaft sleeve 13 has a small-diameter section, a medium-diameter section and a large-diameter section from front to back;

[0014] The large-diameter section is connected with an external impeller, and a plurality of annular grate teeth are arranged on the outer side wall of the large-diameter section, and a sealing ring is arranged between the annular grate teeth and the bearing cavity;

[0015] The roller bearing 9 is arranged in the medium-diameter section, and the inner ring bushing 8 is arranged on the outer surface of the medium-diameter section and located on the side close to the large-diameter section and abutting against the roller bearing 9;

[0016] The inner ring bushing 8 and the bearing seat 6 are provided with an outer ring bushing 7 therebetween, and a sliding oil cavity is formed between the inner ring bushing 8 and the outer ring bushing 7 and communicates with the inside of the roller bearing 9;

[0017] An annular sliding oil groove is arranged on the inner surface of the bearing cavity;

[0018] The outer ring bushing 7 and the bearing seat 6 are provided with a plurality of sliding oil holes in the circumferential direction to communicate the sliding oil cavity with the annular sliding oil groove on the inner surface of the bearing cavity.

[0019] Further, the structure further comprises a graphite sealing ring 5, and the graphite sealing ring 5 is arranged between the medium-diameter section of the transmission shaft sleeve 13 and the bearing seat 6 to seal the gap between the inner ring bushing 8, the outer ring bushing 7 and the bearing seat 6.

[0020] Further, the structure further comprises a speed measuring wheel 11;

[0021] The speed measuring wheel 11 comprises an integrally formed speed measuring section and a connecting section, and the connecting section is connected with the outer spline of the small-diameter section of the transmission shaft sleeve 13 through the inner spline;

[0022] A group of speed measuring teeth are uniformly arranged on the outer surface of the speed measuring section of the speed measuring wheel 11, and a speed measuring sensor is installed on the inner side of the bearing cavity corresponding to the speed measuring wheel 11.

[0023] Further, the structure further comprises: an end cover 10; the end cover 10 is connected with the bearing cavity through screws, one side end surface of the end cover 10 is in contact with the outer ring of the roller bearing 9 and presses the roller bearing, and the inner side wall of the end cover 10 and the outer surface of the speed measuring wheel 11 form a lubricating oil backflow channel.

[0024] Further, the structure further comprises: an L-shaped sealing ring 15 arranged between the end cover 10 and the roller bearing 9, used for preventing the outflow of lubricating oil in the roller bearing 9 from overflowing from the gap between the end cover 10 and the roller bearing 9.

[0025] Further, the roller bearing 9 and the bearing seat 6 are in clearance fit; the inner surface of the corresponding area of the bearing seat 6 and the roller bearing 9 is provided with an annular oil storage groove; the lubricating oil in the annular oil storage groove fills the gap between the roller bearing 9 and the bearing seat 6 and is used for adjusting the damping.

[0026] Further, the bearing cavity is connected with the front end part and forms a sealed large lubricating oil cavity, and a channel is arranged on the inner wall of the bearing cavity to communicate the sealed large lubricating oil cavity with the annular lubricating oil groove.

[0027] The beneficial effects of the present application are as follows:

[0028] 1. The present application is a compact multifunctional compressor inlet chamber structure with a bearing cavity, which is compact in structure, convenient to realize, integrally formed with the bearing cavity and the outer shell, and integrates the bearing support seat structure, thereby reducing the number and weight of parts, small cumulative tolerance, and effectively transmitting the front and rear end loads of the inlet support shell, thereby avoiding the complex problems of structural response prediction in the design of the multi-component load transmission system.

[0029] 2. The integrated inlet chamber is provided with two inlets, namely an inlet 1 and an inlet 2, the inlet 1 can inhale air from the atmospheric environment, and the inlet 2 inhales air from the environmental control system, thereby realizing the function of multiple air sources through the multi-inlet design and realizing multiple mode operation of the engine.

[0030] 3. The bearing system is coupled with the lubricating oil lubrication and distribution function, so that the roller bearing is better lubricated, the extrusion oil film improves the rotor dynamics characteristics, provides the rotor support paper pad for the front end of the compressor, and integrates the speed measuring wheel for speed measurement. BRIEF DESCRIPTION OF DRAWINGS

[0031] Figure 1 It is a compressor inlet chamber structure with a bearing cavity according to the embodiment of the present application;

[0032] Figure 2 It is an inlet support shell according to the embodiment of the present application;

[0033] Figure 3 It is a bearing support according to the embodiment of the present application;

[0034] Figure 4 is the speed measuring wheel intended for the embodiment of the present application;

[0035] Wherein: 1-bolt, 2-nut, 3-duct, 4-intake support shell, 5-graphite seal, 6-bearing seat, 7-outer ring bushing, 8-inner ring bushing, 9-roller bearing, 10-end cover, 11-speed measuring wheel, 12-square air inlet, 13-transmission shaft sleeve, 14-sealing ring, 15-L-shaped sealing pad. DETAILED DESCRIPTION

[0036] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the protection scope of the present application.

[0037] A compressor intake chamber structure with a bearing cavity includes an intake support shell 4 and a duct 3. The duct 3 is fastened to the right flange of the intake support shell 4 by bolts and forms the main space structure of the compressor intake chamber. The duct 3 has the functions of guiding airflow to the compressor inlet and reducing inlet unevenness.

[0038] The designed intake support shell 4 is a multifunctional integrated structure. The outer conical annular surface serves as an outer isolation surface of the intake chamber and has the functions of load transmission and support. It is used to transmit loads at both ends of the intake support shell 4. Two air inlets are arranged on the outer surface of the intake support shell, namely an air inlet 1 and an air inlet 2. The air inlet 1 is used in cooperation with an air intake door to realize environmental air intake and control. The air inlet 2 is connected to a control system through a control air intake valve to receive control air intake and realize double-mode air intake. Figure 2

[0039] The left side of the intake support shell 4 is provided with a horn-shaped bearing cavity. As shown in Figure 1 An oil pipe is arranged in the bearing cavity, and a bearing seat 6 is installed inside. A rotor support system is installed in the bearing cavity in the intake support shell 4 through the bearing seat 6 and an end cover 10. The intake support shell 4 has a radial opening for installing a speed sensor. One side of the end cover 10 is also opened, and the center axes of the two openings are aligned. A speed measuring wheel 11 is used to cooperate with the speed sensor to measure the rotor speed.

[0040] A bearing support structure is also included. As shown in Figure 3 ​As shown, the drive shaft sleeve 13 has three steps. The right end is designed with end face teeth for connection, and the left side is provided with a spline for connecting the speed measuring wheel 11. The first step on the right side of the drive shaft sleeve 13 is provided with a grate sealing structure, which cooperates with the sealing ring 14 to seal the leakage of the compressor. The second step in the middle of the drive shaft sleeve cooperates with the graphite seal 5 to isolate the oil and gas. The third step is located on the far left and is designed with a lubricating oil distribution structure and is equipped with a roller bearing 9. The lubricating oil distribution structure consists of an outer ring bushing 7 and an inner ring bushing 8. The outer ring bushing 7 is provided with several round holes around its circumference, which communicate with the lubricating oil entering from the outside of the bearing housing 6. The lubricating oil is distributed to the roller bearing 9 and the parts that need lubrication through the holes. The inner ring bushing is tightly fitted with the drive shaft on one hand and cooperates with the graphite seal moving ring on the other hand to form a seal on the left and right sides. The inner ring of the roller bearing 9 is provided with a pull-out groove to facilitate the disassembly and assembly of the roller bearing. The outer ring of the roller bearing 9 is pressed by the end cover 10 to form a stable installation of the shaft system. The entire shaft system is installed in the bearing cavity on the left side of the intake support housing 4 through the bearing seat 6.

[0041] It also includes a speed measuring wheel 11 with an internal spline on the right side and an external spline on the transmission shaft sleeve 13. The speed measuring wheel 11 has an internal gear on the left side for connecting the front-end transmission components. Several speed measuring teeth are set on the outer circular surface of the left side of the speed measuring wheel 11 to cooperate with the speed sensor installed on the intake support housing to measure the speed of the transmission shaft sleeve 13.

[0042] The specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0043] like Figure 1 As shown in the diagram, the right end of the intake support housing 4 is connected to the guide shroud 3 via a flange. The flange edge is circumferentially secured with bolts 1 and nuts 2. The outer wall of the intake support housing 4, the outer surface of the bearing cavity, and the guide shroud 3 form the main space of the intake chamber, used to guide the compressor intake airflow. Two air inlets are provided on the outer surface of the intake support housing 4. The structure of the intake support housing is as follows: Figure 2 As shown, air inlet 1 can be used in conjunction with the air intake damper to control the intake of atmospheric air, and air inlet 2 can be used in conjunction with the environmental control intake valve to control the intake of the environmental control system.

[0044] like Figure 1 The bearing cavity and intake support housing 4 shown in the structure are integrated. The bearing cavity is installed inside the bearing housing 6, and the bearing housing 6 is installed on the rotating shaft system. The detailed structure of the rotating shaft system is as follows: Figure 3As shown, the right end of the transmission shaft sleeve 13 is connected with the compressor impeller rotor, the first step of the transmission shaft sleeve 13 is provided with a screen seal for sealing the compressor leakage gas, the second step of the middle part of the transmission shaft sleeve 13 is used for cooperating with the graphite seal 5, the third step of the left side of the transmission shaft sleeve 13 cooperates with the roller bearing 9, the right side of the roller bearing is designed with an outer ring bushing 7 and an inner ring bushing 8, the outer ring bushing 7 is provided with a plurality of circular holes in the circumferential direction, and the inner ring bushing 8 forms an oil distribution structure in front of the roller bearing together, on the other hand, the inner ring bushing 8 also cooperates with the graphite seal to seal the oil and the compressor leakage gas. The spline on the left side of the transmission shaft sleeve 13 is connected with the speed measuring wheel 11, the outer side of the speed measuring wheel 11 is designed with a speed measuring gear, which is used for measuring the speed of the transmission shaft sleeve 13 together with the speed sensor installed on the air inlet support shell 4, and the inner side of the speed measuring wheel 11 is designed with an internal gear, which is used for connecting with the left end transmission component.

[0045] The compressor inlet chamber with bearing cavity is an integrated design, which combines the inlet chamber with the front and rear support functions of the inlet chamber, and integrates the shaft structure, lubrication and sealing structure and speed measuring structure. The shaft can be connected with the right end impeller and the left end rotating component, and the structure is compact and reliable.

[0046] The above is only a specific embodiment of the present application, and the present application is described in detail, and the part not described in detail is a conventional technology. However, the protection scope of the present application is not limited to this, any change or replacement that can be easily thought of by those skilled in the art within the technical range disclosed by the present application should be covered in the protection scope of the present application. The protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A compressor inlet chamber structure with a bearing cavity, characterized in that, The structure includes: an intake support housing (4), a flow guide (3), a graphite sealing ring (5), a bearing seat (6), an outer ring bushing (7), an inner ring bushing (8), a roller bearing (9), an end cap (10), a speed measuring wheel (11), a transmission shaft sleeve (13), an L-shaped sealing gasket (15), and a sealing ring (14). The air intake support housing (4) includes an integrally formed cylindrical air intake housing, a funnel-shaped bearing cavity, a first air intake port, and a second air intake port; The large end of the bearing cavity is connected to the front end of the air intake housing, and the rear end of the air intake housing is connected to the air guide shroud (3). The air deflector (3) is horn-shaped, and the outer edge of the air deflector (3) is provided with a flange edge that is screwed to the rear end of the air intake support housing (4); The included angle between the axes of the first air inlet and the second air inlet on the air intake support housing (4) is 70°~120°; The bearing housing (6) is coaxially mounted in the bearing cavity of the intake support housing (4) by interference fit; A roller bearing (9) is installed inside the bearing housing (6), and the transmission shaft sleeve (13) is fitted inside the roller bearing (9); the transmission shaft sleeve (13) is a stepped shaft, consisting of a small diameter section, a medium diameter section, and a large diameter section from the front and rear ends. The speed measuring wheel (11) includes an integrally formed speed measuring section and a connecting section. The connecting section is connected to the outer spline of the small diameter section of the transmission shaft sleeve (13) through an internal spline. The outer surface of the speed measuring section of the speed measuring wheel (11) is uniformly provided with a set of speed measuring teeth, and a speed measuring sensor is installed on the inner side of the bearing cavity at the corresponding position of the speed measuring wheel (11).

2. The compressor inlet chamber structure according to claim 1, characterized in that, The large-diameter section is connected to the external impeller; the outer wall of the large-diameter section is provided with multiple rings of annular grating teeth, and a sealing ring is provided between the annular grating teeth and the bearing cavity; The roller bearing (9) is located in the intermediate diameter section, and the inner ring bushing (8) is located on the outer surface of the intermediate diameter section, on the side of the roller bearing (9) close to the large diameter section and in close contact with the roller bearing (9). An outer ring bushing (7) is provided between the inner ring bushing (8) and the bearing housing (6); the inner ring bushing (8) and the outer ring bushing (7) form a lubricating cavity and communicate with the inside of the roller bearing (9); The inner surface of the bearing cavity is provided with an annular lubricating oil groove; The outer ring bushing (7) and bearing housing (6) are provided with multiple lubricating holes along the circumferential direction to connect the lubricating oil cavity with the annular lubricating oil groove on the inner surface of the bearing cavity.

3. The compressor inlet chamber structure according to claim 2, characterized in that, The structure also includes a graphite sealing ring (5); the graphite sealing ring (5) is disposed between the middle diameter section of the transmission shaft sleeve (13) and the bearing seat (6) to seal the gap between the inner ring bushing (8), the outer ring bushing (7) and the bearing seat (6).

4. The compressor inlet chamber structure according to claim 3, characterized in that, The structure also includes: an end cap (10); the end cap (10) is connected to the bearing cavity by screws, one end face of the end cap (10) contacts and presses the roller bearing (9) on the outer ring, and an oil return channel is formed between the inner wall of the end cap (10) and the outer surface of the speed measuring wheel (11).

5. The compressor inlet chamber structure according to claim 4, characterized in that, The structure also includes an L-shaped sealing gasket (15), which is disposed between the end cap (10) and the roller bearing (9) to prevent the lubricating oil flowing out of the roller bearing (9) from overflowing from the gap between the end cap (10) and the roller bearing (9).

6. The compressor inlet chamber structure according to claim 5, characterized in that, The roller bearing (9) and the bearing housing (6) are clearance fit; the surface of the corresponding area of ​​the bearing housing (6) and the roller bearing (9) is provided with an annular oil reservoir; the lubricating oil in the annular oil reservoir fills the gap between the roller bearing (9) and the bearing housing (6) to adjust the damping.

7. The compressor inlet chamber structure according to claim 6, characterized in that, The bearing cavity is connected to the front end component to form a sealed large lubricating oil cavity, and a channel is provided on the inner wall of the bearing cavity to connect the sealed large lubricating oil cavity with the annular lubricating oil groove.

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