A two-stage compound supercharging system

Abstract

The application relates to a two-stage compound supercharging system, which comprises a first-stage air compressor (9), a second-stage air compressor (3), a motor (10), a battery (11), a controller (12), a turbine (8) and a driving mechanism, wherein the driving mechanism comprises a motor shaft (1), a driving wheel (2), a driven wheel (6), a clutch (4), meshing teeth (5) and a supercharger shaft (7); the application realizes the air intake required by the engine according to the air intake amount of the engine, strengthens the supercharging capacity and realizes the high-altitude self-adaptive supercharging of the rotor engine through turbocharging and cooperation with the electric compound supercharging mode which can be cut in according to the excess air coefficient of the engine; and the performance attenuation problem of the engine two-stage supercharging system can be solved.

Description

Technical Field

[0001] This invention belongs to the field of electric-assisted turbochargers, specifically relating to a two-stage compound turbocharging system. Background Technology

[0002] The performance of the second-stage supercharging system in a UAV-powered rotary engine degrades with increasing altitude. For centrifugal compressors, at the same rotational speed, the Reynolds number decreases with altitude. When the Reynolds number is in the non-self-modeling region, its impact on compressor efficiency is significant. During high-altitude cruise, the compressor inlet Reynolds number easily falls below the self-modeling Reynolds number limit, leading to a significant performance degradation of the second-stage supercharging system. The performance degradation problem of the second-stage supercharging system under low Reynolds number conditions urgently needs to be addressed. Summary of the Invention

[0003] This invention provides a two-stage compound supercharging system. The technical problem to be solved is to overcome the problem that in the prior art, the performance of the two-stage supercharging system of a rotary engine decreases with increasing altitude, and the compressor inlet Reynolds number easily falls below the self-modeled Reynolds number limit, resulting in insufficient pressure and performance degradation of the two-stage supercharging system, and the compressor failing to supercharge normally.

[0004] To solve the above technical problems, the present invention provides a two-stage compound supercharging system, characterized in that it includes a first-stage compressor 9, a second-stage compressor 3, a motor 10, a battery 11, a controller 12, a turbine 8, and a drive mechanism; the drive mechanism includes a motor shaft 1, a drive wheel 2, a driven wheel 6, a clutch 4, meshing teeth 5, and a supercharger shaft 7; the motor 10 is connected to the battery 11 via a cable, and the motor 10 is connected to the first-stage compressor 9 via the motor shaft 1; the outlet of the first-stage compressor 9 is connected to the inlet of the second-stage compressor 3 via a pipeline, and the second-stage compressor 3 and the turbine 8 are coaxially connected via the supercharger shaft 7; the drive wheel 2 is fixed on the motor shaft 1 and meshes with the driven wheel 6, the driven wheel 6 is coaxially fixed to the clutch 4, and the meshing teeth 5 are fixed on the supercharger shaft 7; the controller 12 is electrically connected to the motor 10 and the clutch 4 respectively, and is used to control the engagement or disengagement of the clutch 4 and the meshing teeth 5.

[0005] Furthermore, the motor 10 is an integrated starter motor. When the clutch 4 engages with the meshing gear 5, the turbine 8 drives the motor 10 in reverse through the turbocharger shaft 7 and the drive mechanism to generate electricity and charge the battery 11.

[0006] Furthermore, the controller 12 is configured to monitor the engine excess air coefficient λ in real time and set the target control range of λ to 0.88 to 1.05.

[0007] Furthermore, when the engine is in a high-altitude environment, the controller 12 controls the motor 10 to start and controls the clutch 4 to engage with the meshing gear 5, so that the motor shaft 1 synchronously drives the first-stage compressor 9 and the second-stage compressor 3 to compensate for the insufficient output energy of the turbine 8 and increase the intake air volume.

[0008] Furthermore, when the engine excess air coefficient λ > 1.05, the controller 12 controls the clutch 4 to disengage from the meshing gear 5, the motor 10 independently drives the first-stage compressor 9, and the second-stage compressor 3 is driven by the turbine 8.

[0009] Furthermore, during engine start-up, controller 12 controls motor 10 to stop working and clutch 4 to disengage, allowing the engine to start in a fuel-rich mode.

[0010] Furthermore, when the turbine 8 speed exceeds the preset threshold, the controller 12 controls the clutch 4 to engage with the meshing gear 5, and the turbine 8 drives the integrated starter motor 10 to generate electricity through the drive mechanism, recovering the excess energy to the battery 11.

[0011] Furthermore, the primary compressor 9 is a centrifugal or axial-flow low-pressure compressor, and the secondary compressor 3 is a centrifugal high-pressure compressor; the two are connected in series to achieve two-stage pressurization.

[0012] Furthermore, the drive wheel 2 and the driven wheel 6 are driven by cylindrical gears, helical gears, or planetary gears.

[0013] Furthermore, the clutch 4 is an electromagnetic clutch, a friction clutch, or a gear clutch.

[0014] Beneficial effects: This invention can solve the performance degradation problem of the engine's two-stage supercharging system. By combining turbocharging with an electric compound supercharging mode that can be switched according to the engine's excess air coefficient, the supercharging capability can be enhanced based on the engine's required intake air volume, achieving high-altitude adaptive supercharging of the rotary engine.

[0015] 1) When the rotary engine operates at high altitude, the controller controls the motor to drive both the first-stage and second-stage compressors simultaneously. This compensates for the insufficient turbine energy and the inability of the second-stage compressor to properly pressurize the turbine when the rotary engine is operating at high altitude. 2) A two-stage composite supercharging system that automatically adjusts the supercharged air flow and pressure ratio to ensure that the λ value of the rotary engine is in the range of 0.88 to 1.05 under normal operating conditions, thereby achieving efficient combustion of the engine.

[0016] 3) A two-stage compound supercharging system, in which when the turbine speed exceeds the set speed value, the controller controls the clutch to engage with the meshing teeth, and the excess energy is fed back to the battery through the drive mechanism to maintain the energy balance of the rotary engine. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of the present invention.

[0018] in: 1. Motor shaft; 2. Drive wheel; 3. Second stage compressor; 4. Clutch; 5. Meshing gear; 6. Driven wheel; 7. Turbocharger shaft; 8. Turbine; 9. First stage compressor; 10. Motor; 11. Battery; 12. Controller. Detailed Implementation

[0019] To make the objectives, contents, and advantages of the present invention clearer, the specific embodiments of the present invention will be described in further detail below.

[0020] The present invention proposes a two-stage compound supercharging system, including a first-stage compressor 9, a second-stage compressor 3, a motor 10, a battery 11, a controller 12, a turbine 8, and a drive mechanism. The drive mechanism includes a motor shaft 1, a drive wheel 2, a driven wheel 6, a clutch 4, a meshing gear 5, and a supercharger shaft 7. The motor 10 is connected to the battery 11 via a cable. The motor 10 is connected to the first-stage compressor 9 via the motor shaft 1. The outlet of the first-stage compressor 9 is connected to the inlet of the second-stage compressor 3 via a pipeline. The second-stage compressor 3 is connected to the turbine 8 via the turbocharger shaft 7.

[0021] The drive wheel 2 is fixedly sleeved on the motor shaft 1. The drive wheel 2 meshes with the driven wheel 6. The driven wheel 6 is coaxially fixedly connected to the clutch 4. The meshing teeth 5 are fixedly sleeved on the turbocharger shaft 7. The controller 12 is connected to the motor 10 and the clutch 4 by wiring to realize the control of the motor 10 and the clutch 4.

[0022] Through the controller 12, the clutch 4 can contact the meshing teeth 5 to drive the motor shaft 1 to rotate the turbocharger shaft 7, or through the controller 12, the clutch 4 can disengage from the meshing teeth 5 to achieve asynchronous rotation speeds between the motor shaft 1 and the turbocharger shaft 7.

[0023] Furthermore, the motor 10 is an integrated starter motor. The energy of the engine can be transmitted to the motor 10 through the turbine 8 and the drive mechanism, so that the motor 10 generates electricity to charge the battery 11.

[0024] This invention discloses a two-stage compound supercharging system, the working principle of which is as follows: When the rotary engine starts, the motor 10 does not work, and the engine starts at a lower λ value to achieve a rich oil start. During the actual operation of the rotary engine, the controller 12 monitors the excess air coefficient λ value in real time, and sets the λ value to operate in the range of 0.88 to 1.05. When the rotary engine operates at high altitude, the controller 12 controls the motor 10 to work, and the clutch 4 and meshing gear 5 engage synchronously. This allows the motor shaft 1 to simultaneously drive the first-stage compressor 9 and the second-stage compressor 3, compensating for the insufficient energy of the turbine 8 and the inability of the second-stage compressor 3 to properly boost pressure when the rotary engine operates at high altitude. Air from the outlet of the first-stage compressor 9 enters the inlet of the second-stage compressor 3, forming an electrically assisted compound booster system. This increases the intake air volume of the rotary engine, resulting in greater torque output at low speeds. The booster continues until the rotary engine power increases, with the λ value ranging from 0.88 to 1.05.

[0025] When the λ value of the rotary engine is greater than 1.05, the controller 12 controls the clutch 4 to disengage from the meshing teeth 5, and only the two-stage supercharging system formed by the primary compressor 9 and the secondary compressor 3 works.

[0026] When the turbine 8 speed exceeds the set speed value, the controller 12 controls the clutch 4 to engage with the meshing teeth 5, and the excess energy is fed back to the battery 11 to maintain the energy balance of the rotary engine.

[0027] Furthermore, any content not described in detail in this specification is existing technology known to those skilled in the art.

[0028] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A two-stage compound supercharging system, characterized in that, It includes a primary compressor (9), a secondary compressor (3), a motor (10), a battery (11), a controller (12), a turbine (8), and a drive mechanism; the drive mechanism includes a motor shaft (1), a drive wheel (2), a driven wheel (6), a clutch (4), meshing gears (5), and a turbocharger shaft (7); the motor (10) is connected to the battery (11) via a cable, and the motor (10) is connected to the primary compressor (9) via the motor shaft (1); the primary compressor (9) 9) The outlet is connected to the inlet of the secondary compressor (3) via a pipeline. The secondary compressor (3) and the turbine (8) are coaxially connected via the turbocharger shaft (7). The drive wheel (2) is fixed on the motor shaft (1) and meshes with the driven wheel (6). The driven wheel (6) is coaxially fixed with the clutch (4). The meshing teeth (5) are fixed on the turbocharger shaft (7). The controller (12) is electrically connected to the motor (10) and the clutch (4) respectively, and is used to control the engagement or disengagement of the clutch (4) and the meshing teeth (5).

2. The two-stage compound supercharging system according to claim 1, characterized in that, The motor (10) is an integrated starter motor. When the clutch (4) engages with the meshing gear (5), the turbine (8) drives the motor (10) in reverse through the booster shaft (7) and the drive mechanism to generate electricity and charge the battery (11).

3. The two-stage compound supercharging system according to claim 1, characterized in that, The controller (12) is configured to monitor the engine excess air coefficient λ in real time and set the target control range of λ to 0.88 to 1.

05.

4. The two-stage compound supercharging system according to claim 3, characterized in that, When the engine is in a high-altitude environment, the controller (12) controls the motor (10) to start and controls the clutch (4) to engage with the meshing gear (5), so that the motor shaft (1) synchronously drives the first-stage compressor (9) and the second-stage compressor (3) to compensate for the insufficient output energy of the turbine (8) and increase the intake volume.

5. The two-stage compound supercharging system according to claim 3, characterized in that, When the engine excess air coefficient λ > 1.05, the controller (12) controls the clutch (4) to disengage from the meshing teeth (5), the motor (10) independently drives the first-stage compressor (9), and the second-stage compressor (3) is driven by the turbine (8).

6. The two-stage compound supercharging system according to claim 1, characterized in that, When the engine is starting, the controller (12) controls the motor (10) to not work and the clutch (4) to disengage, and the engine starts in a rich oil mode.

7. The two-stage compound supercharging system according to claim 1, characterized in that, When the turbine (8) speed exceeds the preset threshold, the controller (12) controls the clutch (4) to engage with the meshing gear (5), and the turbine (8) drives the integrated motor (10) to generate electricity through the drive mechanism, and recovers the excess energy to the battery (11).

8. The two-stage compound supercharging system according to claim 1, characterized in that, The primary compressor (9) is a centrifugal or axial flow low-pressure compressor, and the secondary compressor (3) is a centrifugal high-pressure compressor. The two are connected in series to achieve two-stage boosting.

9. The two-stage compound supercharging system according to claim 1, characterized in that, The driving wheel (2) and the driven wheel (6) are driven by cylindrical gears, helical gears or planetary gears.

10. The two-stage compound supercharging system according to claim 1, characterized in that, The clutch (4) is an electromagnetic clutch, a friction clutch, or a gear clutch.

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