Gas loop device for dynamic pressure gas bearing environment of turbine expander
By designing a gas circuit device in the turbine expander, a stable gas pressure range is formed using high-pressure gas, which solves the problem of failure of the dynamic pressure air bearing under impact, enhances the bearing's load-bearing capacity and sealing performance, and reduces heat loss.
Patent Information
- Application Number
- CN202520204600.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-10
- Publication Date
- 2025-11-25
- Estimated Expiration
- 2035-02-10
AI Technical Summary
When subjected to a large external impact, the air film pressure of the dynamic pressure air bearing is insufficient to resist the external load, leading to bearing failure and rotor imbalance, as well as heat loss and cold loss.
Design a gas circuit device for the environment of a turbine expander motorized air bearing. By introducing high-pressure gas and cooling it with a heat exchanger, a stable gas pressure range is formed, which enhances the bearing's load-bearing capacity and impact resistance. The gas pressure is adjusted by a pressure regulating valve to balance the leakage pressure.
It improves the impact resistance and load-bearing capacity of the dynamic pressure air bearing, reduces heat loss on the fan side and cold loss on the turbine side, and enhances the sealing of the bearing environment.
Smart Images
Figure CN223594245U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to gas bearing technology and high -speed rotating machinery field especially relates to a gas loop device of turbine expander dynamic pressure gas bearing environment. BACKGROUND
[0002] As a kind of high-speed rotating machinery, turbine expander is mainly applied to energy recovery and cold quantity preparation, in the working process of turbine expander, rotor operates at high speed, under this condition, using traditional mechanical bearing can lead to high friction, high wear, and even can cause the consequence of rotor system overheating failure.Gas bearing is a kind of non-contact bearing, it can reduce the vibration and noise of rotor system, reduce the friction and wear of rotor, and is suitable for high-speed rotating, high-temperature environment and deep cryogenic environment conditions.Currently, the main types of gas bearing include dynamic pressure bearing, static pressure bearing and magnetic bearing, static pressure bearing has good integrity, and provides stable pressure to make rotor rotate smoothly, but the impact resistance and carrying capacity of static pressure bearing are poor, magnetic bearing supports rotating parts by using static pressure and magnetic field, mainly applied to high-precision equipment, its structure is relatively complex, and the cost is high, while dynamic pressure bearing adopts the structure of metal foil, gas film pressure is formed between foil and shaft during rotor operation to support rotating parts, which has good impact resistance and carrying capacity, can bear the working condition of ultra-high speed, and the process difficulty and cost of dynamic pressure bearing are also lower than those of static pressure bearing and magnetic bearing.
[0003] Compared with static pressure bearing and magnetic bearing, dynamic pressure gas bearing has better carrying capacity, but when dynamic pressure bearing is subjected to large external impact, gas film pressure is insufficient to resist external impact load, so that collision and friction occur between rotor and bearing during rotor rotation, resulting in the consequences of dynamic pressure bearing failure and rotor imbalance, therefore, the impact resistance and carrying capacity of bearing can be further improved by increasing the gas pressure of dynamic pressure gas bearing environment.
[0004] Considering that the thermodynamic properties of gas working substance greatly affect the stability of dynamic pressure gas bearing, the application provides a novel gas loop device of turbine expander dynamic pressure gas bearing environment, high-pressure gas at the outlet of turbine expander fan wheel is cooled and decelerated by heat exchanger, and stable pressure gas is introduced into bearing environment by pressure regulating valve, high-pressure gas environment is created by using the gas, gas film pressure between dynamic pressure bearing and rotor is further improved during rotor system operation, carrying capacity and impact resistance of bearing are improved, high-pressure gas is introduced into bearing environment after cooling by heat exchanger, which can effectively reduce the heating problem of rotor system fan side and the problem of cold loss of turbine side, and high-pressure gas can form dynamic pressure range to balance the gas pressure caused by wheel back leakage and side cover plate sealing leakage. SUMMARY
[0005] The utility model aims at providing a kind of turbine expander dynamic pressure gas-float bearing environment's gas circuit device, by design turbine expander fan wheel outlet's high-pressure gas introduction dynamic pressure gas-float bearing environment's device, improve the impact resistance and carrying capacity of dynamic pressure bearing, after the cooling of heat exchanger, fan side heat loss and turbine side cold loss can be effectively reduced, high-pressure gas forms dynamic adjustable pressure in bearing environment, can balance the gas pressure caused by turbine expander both ends wheel back leakage and side cover plate leakage, enhance the sealing of bearing environment.
[0006] In order to achieve the above object, the utility model provides the following technical scheme: a kind of turbine expander dynamic pressure gas-float bearing environment's gas circuit device, it is characterized by: the device includes fan side volute (1), pipeline I (2), fan wheel (3), fan side cover plate (4), fan side dynamic pressure gas-float radial bearing (5), machine shell (6), main shaft (7), turbine side dynamic pressure gas-float radial bearing (8), turbine side cover plate (9), nozzle (10), turbine wheel (11), turbine side diffuser (12), turbine side dynamic pressure gas-float thrust bearing (13), fan side dynamic pressure gas-float thrust bearing (14), pressure regulating valve (15), pipeline II (16), heat exchanger (17), exhaust valve (18), wherein, in the machine shell (6) of turbine expander, turbine expander rotor main shaft (7), fan side cover plate (4), fan side dynamic pressure gas-float radial bearing (5), fan side dynamic pressure gas-float thrust bearing (14), turbine side dynamic pressure gas-float thrust bearing (13), turbine side dynamic pressure gas-float radial bearing (8) and turbine side cover plate (9) constitute dynamic pressure gas-float bearing environment, two air-bleed holes are opened on the outer wall of machine shell (6), and are respectively communicated with four air-bleed holes on inner wall, gas enters the import area of fan wheel (3), after compression, outlet gas is discharged from fan side volute (1) by pipeline II (16), heat exchanger (17) is on pipeline II (16) to carry out temperature reduction, speed reduction and pressure stabilization to outlet gas, gas is connected by pressure regulating valve (15) on pipeline II (16) air-bleed hole on the right outer wall surface of machine shell (6), gas is shunted by air-bleed hole structure and introduced into the bearing environment in machine shell (6), and is discharged from machine shell (6) by air-bleed hole on the left wall surface of machine shell (6) and flows into pipeline I (2), pipeline I (2) is connected with fan side volute (1), and gas is introduced into the import area of fan wheel (3) again, to form turbine expander dynamic pressure gas-float bearing environment's gas circuit device.
[0007] Further, the turbine expander main shaft (7) is placed in the horizontal direction or vertical direction, and the fan wheel (3), the fan side cover plate (4), the fan side dynamic pressure gas-float radial bearing (5), the fan side dynamic pressure gas-float thrust bearing (14), the turbine side dynamic pressure gas-float thrust bearing (13), the turbine side dynamic pressure gas-float radial bearing (8), the turbine side cover plate (9), and the turbine wheel (11) are sequentially arranged on the main shaft (7), and the machine shell (6) forms a dynamic pressure gas-float bearing environment.
[0008] Further, the fan side cover plate (4) and the turbine side cover plate (9) are assembled with the main shaft (7) in a labyrinth seal manner, the gas enters the dynamic pressure gas floating bearing environment from the right side of the casing (6) through the gas guide hole, forming a dynamic pressure range to balance the gas pressure caused by the leakage of the wheel back and the leakage of the side cover plate.
[0009] Further, the pipeline II (16) is provided with an exhaust valve (18), a heat exchanger (17) and a pressure regulating valve (15), the exhaust valve (18) on the branch of the pipeline II (16) is used to exhaust the excess pressure at the outlet of the fan wheel (3), the heat exchanger (17) on the main road of the pipeline II (16) is used for gas cooling and pressure buffering, and the pressure regulating valve (15) is used to control the gas pressure at the inlet of the dynamic pressure gas floating bearing environment in the casing (6), so as to adapt to different working conditions.
[0010] Further, the casing (6) can be manufactured in two sections, and the outer wall surface semicircular holes of the upper and lower two sections are aligned and welded as an integral part, or a three-section processing method is adopted, that is, the casing (6) is divided into three parts along the axial direction, and the gas guide holes are processed and welded to form a gas guide pipeline. BRIEF DESCRIPTION OF DRAWINGS
[0011] Figure 1 is a structural schematic diagram of a gas circuit device of a dynamic pressure gas floating bearing environment of a turbine expander provided by the embodiment of the disclosure. DETAILED DESCRIPTION
[0012] In order to enable more detailed understanding of the features and technical contents of the embodiments of the disclosure, the implementation of the embodiments of the disclosure will be described in detail below, and the attached drawings are only used for reference and do not limit the embodiments of the disclosure. In the following technical description, in order to facilitate explanation, through multiple details, a sufficient understanding of the disclosed embodiments is provided. However, one or more embodiments can still be implemented without these details. In other cases, in order to simplify the drawings, well-known structures and devices can be simplified.
[0013] As Figure 1The utility model provides a kind of gas loop device of turbine expander dynamic pressure gas bearing environment, the device is recycled by high-pressure gas of fan wheel 3 export, gas is introduced into dynamic pressure gas bearing environment by pipeline II 16, the environment is constituted by casing 6, main shaft 7, fan wheel 3, fan side cover plate 4, fan side dynamic pressure gas floating radial bearing 5, fan side dynamic pressure gas floating thrust bearing 14, turbine side dynamic pressure gas floating thrust bearing 13, turbine side dynamic pressure gas floating radial bearing 8, turbine side cover plate 9 and turbine wheel 11, pipeline II 16 is equipped with exhaust valve 18, heat exchanger 17 and pressure regulating valve 15, exhaust valve 18 can control the gas of fan wheel 3 export excess, heat exchanger 17 can carry out cooling, speed reduction and pressure stabilization to the gas of fan side export, and by pressure regulating valve 15 is connected into casing 6, by the branch pipe of casing 6 right side outer wall surface is discharged into bearing environment to provide stable adjustable pressure cooling gas, reduce turbine fan side heat loss and turbine side cold loss, can enhance the load capacity and impact resistance of dynamic pressure gas bearing, and adjustable gas pressure can balance side cover plate sealing leakage and wheel back leakage gas pressure, gas in bearing environment is discharged from casing 6 to pipeline I 2 from casing 6 left side inner wall surface pipe, gas is discharged into the import area of fan wheel 3 in fan side volute 1 by pipeline I 2, form complete dynamic pressure gas bearing environment gas loop device.
Claims
1. A gas circuit arrangement for a turbogas expander dynamic pressure gas bearing environment, characterized by: The device comprises a fan side volute (1), a pipeline I (2), a fan wheel (3), a fan side cover plate (4), a fan side dynamic pressure gas float radial bearing (5), a casing (6), a main shaft (7), a turbine side dynamic pressure gas float radial bearing (8), a turbine side cover plate (9), a nozzle (10), a turbine wheel (11), a turbine side diffuser (12), a turbine side dynamic pressure gas float thrust bearing (13), a fan side dynamic pressure gas float thrust bearing (14), a pressure regulating valve (15), a pipeline II (16), a heat exchanger (17), an exhaust valve (18), wherein, in the casing (6) of the turbine expander, the turbine expander rotor main shaft (7), the fan side cover plate (4), the fan side dynamic pressure gas float radial bearing (5), the fan side dynamic pressure gas float thrust bearing (14), the turbine side dynamic pressure gas float thrust bearing (13), the turbine side dynamic pressure gas float radial bearing (8) and the turbine side cover plate (9) constitute a dynamic pressure gas float bearing environment, two air injection holes are opened on the outer wall of the casing (6) and are respectively communicated with four air injection holes on the inner wall, the gas enters the inlet area of the fan wheel (3), after compression, the outlet gas is discharged from the fan side volute (1) through the pipeline II (16), the pipeline II (16) is provided with a heat exchanger (17) for cooling, decelerating and stabilizing the pressure of the outlet gas, the gas is connected to the air injection hole on the right outer wall surface of the casing (6) through the pressure regulating valve (15) on the pipeline II (16), the gas is divided into the bearing environment in the casing (6) through the air injection hole structure, and the gas is discharged from the casing (6) through the air injection hole on the left wall surface of the casing (6) and flows into the pipeline I (2), the pipeline I (2) is connected to the fan side volute (1) to re-introduce the gas into the inlet area of the fan wheel (3), forming a gas loop device of the turbine expander dynamic pressure gas float bearing environment.
2. A turboexpander motor gas bearing environment gas circuit arrangement according to claim 1, characterized in that: The turbine expander main shaft (7) is placed in an axial direction along a horizontal direction or a vertical direction, and the main shaft (7) is sequentially provided with the fan wheel (3), the fan side cover plate (4), the fan side dynamic pressure gas float radial bearing (5), the fan side dynamic pressure gas float thrust bearing (14), the turbine side dynamic pressure gas float thrust bearing (13), the turbine side dynamic pressure gas float radial bearing (8), the turbine side cover plate (9) and the turbine wheel (11), and constitutes a dynamic pressure gas float bearing environment with the casing (6).
3. A turboexpander motor gas bearing environment gas circuit arrangement according to claim 1, characterized in that: The fan side cover plate (4) and the turbine side cover plate (9) are assembled with the main shaft (7) in a labyrinth sealing mode, the gas enters the dynamic pressure gas float bearing environment from the right air injection hole of the casing (6), forming a dynamic pressure range, balancing the gas pressure caused by the leakage of the wheel back and the sealing leakage of the side cover plate.
4. The turboexpander motor gas bearing environment gas circuit apparatus of claim 1, wherein: The pipeline II (16) is provided with an exhaust valve (18), a heat exchanger (17) and a pressure regulating valve (15), the exhaust valve (18) on the branch of the pipeline II (16) is used for discharging the excess pressure of the outlet of the fan wheel (3), the heat exchanger (17) on the main road of the pipeline II (16) is used for gas cooling and buffer pressure stabilization, and the pressure regulating valve (15) is used for controlling the gas pressure of the inlet of the dynamic pressure gas float bearing environment in the casing (6), and is suitable for different working conditions.
5. The turboexpander motor gas bearing environment gas circuit apparatus of claim 1, wherein: The shell (6) can be manufactured by processing air inlet holes in two sections, and the outer wall surface semicircular holes of the upper and lower shell (6) are aligned and welded into an integral piece, or by a three-section processing method, that is, the shell (6) is divided into three parts along the axial direction, and the air inlet holes are processed and welded to form an air inlet pipeline.