WO2013166627A1

WO2013166627A1 - Double-area turbine of turbine boosting

Info

Publication number: WO2013166627A1
Application number: PCT/CN2012/000714
Authority: WO
Inventors: 王航; 李永泰; 李延昭; 朱智富; 袁道军; 王艳霞; 刘迎鑫
Original assignee: Wang Hang; Li Yongtai; Li Yanzhao; Zhu Zhifu; Yuan Daojun; Wang Yanxia; Liu Yingxin
Priority date: 2012-05-07
Filing date: 2012-05-22
Publication date: 2013-11-14
Also published as: US20150063991A1; CN102661180A

Abstract

A double-area turbine of turbine boosting comprises a turbine volute (1). A turbine impeller (2) is installed inside the turbine volute (1). Turbine blades (14, 15) are provided outside the turbine impeller (2). A volute air inlet (3), a volute air inlet flow channel, and a volute air outlet (4) are provided on the turbine volute (1). Turbine impeller air inlets (17, 19), turbine impeller air inlet flow channels (12, 13), a turbine impeller air outlet and a turbine impeller blade (14, 15) are provided on the turbine impeller (2). Separating boards (11) arranged circumferentially are provided between the turbine impeller air inlets (17, 19) and the turbine impeller air outlet of the turbine impeller (2). The separating boards (11) divide the turbine impeller air inlet flow channels (12, 13) into a turbine impeller air inlet inner flow channel (12) and a turbine impeller air inlet outer flow channel (13). The turbine can meet boosting requirements in a full working condition range of an engine, mitigate the phenomenon of sudden air expansion at a single flow channel air outlet of a volute at a small stream, and improve the efficiency of a turbine at a low stream.

Description

Turbocharged dual zone turbine

Technical field:

The present invention relates to a novel turbo device, and more particularly to a dual zone turbine for turbocharging, which can effectively balance the low speed and high speed supercharging requirements of the engine, and belongs to the field of turbocharging of internal combustion engines. BACKGROUND OF THE INVENTION - With the gradual increase in emission standards, turbochargers are widely used in modern engines. In order to meet the performance and emission requirements of all engine operating conditions, especially at low speeds, the turbocharger must provide higher boost pressure and have adjustable engine intake and exhaust pressure, variable cross section. Turbochargers have become the focus of research and development in the field of pressurization. At present, the turbocharger adopts the structure of the double-channel variable-section turbo volute to meet the requirements of variable cross-section. Compared with the fixed cross-section and the conventional waste-by-side turbocharger, it can effectively widen the turbocharger and The matching range of the engine, the adjustable function of the boost pressure and the exhaust pressure.

Schematic diagram of a two-layer variable-section turbocharger as shown in Fig. 1, the turbine portion of the two-channel variable-section turbocharger includes a turbine volute 1 and a turbine wheel 2. The volute casing 1 is provided with a volute inlet 3, a volute inlet passage and a volute outlet 4, and a radial intermediate partition 5 disposed circumferentially is disposed in the volute intake passage. The intermediate partition 5 divides the volute intake flow passage into a volute intake left flow passage 6 and a volute intake right flow passage 7. The turbine impeller 2 is provided with a turbine impeller inlet 8, a turbine impeller inlet runner 9, and a turbine impeller outlet 10, which are close to the volute intake left runner 6 or the volute intake right runner 7 A valve adjusting mechanism is arranged at the air inlet 3 of the volute to realize a single flow path work or two flow paths to work together, thereby realizing the change of the flow area of the turbine volute flow path.

The double-channel variable-section turbocharger realizes the change of the flow area of the turbine volute through the valve adjusting mechanism, and the control is convenient. However, in practical applications, this two-channel variable-section turbocharger is found to operate in a single flow path of the turbine volute under low-speed engine conditions, and the exhaust gas from the engine is exhausted from the volute. When a single flow passage enters the volute and reaches a single flow passage of the volute, the sudden expansion of the gas is likely to occur, and the gas entering the turbine impeller inlet flow passage from the turbine impeller inlet is reduced, so that the efficiency of the turbine at a small flow rate is lowered. In the engine, under high-speed working conditions, the two flow passages of the turbine volute work together. When the exhaust gas from the engine enters the volute from the volute inlet and the two flow passages reach the turbine impeller inlet, two flow passage gases are prone to occur. By blending, a portion of the gas kinetic energy entering the turbine impeller inlet runner is converted to potential energy, reducing the efficiency of the turbine.

Summary of the invention:

The problem to be solved by the present invention is to provide a two-zone turbine for turbocharging for the above-mentioned defects of the two-channel variable-section turbocharger, which can reduce the gas at the air outlet of a single flow passage of the volute at a small flow rate. Sudden expansion and gas flow at the inlet of the turbine impeller at normal flow to improve the efficiency of the two-channel variable-section turbocharger over the full operating range of the engine.

In order to solve the above problems, the present invention adopts the following technical solutions:

A dual-zone turbine for turbocharging, comprising a turbine volute, a turbine wheel is mounted in the turbine volute, a turbine blade is arranged on the outside of the turbine wheel, and a volute air inlet is arranged on the turbine volute a volute inlet flow passage and a volute air outlet; the turbine impeller is provided with a turbine impeller inlet, a turbine impeller inlet passage, a turbine impeller outlet, and a turbine impeller blade;

A circumferentially arranged partition plate is disposed between the turbine impeller inlet of the turbine impeller and the turbine impeller outlet, and the partition plate divides the turbine impeller inlet flow passage into a turbine impeller intake inner passage and a turbine impeller Intake outflow channel.

The following is a further improvement of the above solution by the present invention:

An intermediate partition is disposed in the volute inlet flow passage, and the intermediate partition divides the volute intake flow passage into a volute intake left flow passage and a volute intake right flow passage;

The volute intake left flow passage is in communication with the turbine impeller intake inner passage, the volute intake The right side flow passage is in communication with the turbine impeller intake outer flow passage.

Further improvement - the left side flow passage of the volute intake air near the turbine impeller is provided with the ventilator intake left side flow passage air outlet; the volute intake right flow passage is close to the turbine impeller and the volute intake right side is provided Runner outlet

Turbine impeller inlet passage is provided with a turbine impeller inlet passage corresponding to the vent inlet left flow passage;

The turbine impeller inlet flow passage is provided with a turbine vane intake outer passage intake port corresponding to the volute intake right side passage outlet.

Further improvement: the inner flow passage of the turbine impeller intake is a centripetal passage.

Another improvement: the inner flow passage of the turbine impeller intake is a mixed flow passage.

Another improvement: The outer impeller of the turbine impeller is a centripetal channel.

Another improvement: The outer impeller of the turbine impeller is a mixed flow channel.

Further improvement: the ratio of the inlet width of the inlet passage of the turbine impeller to the inlet width of the inlet of the turbine impeller is 0.1 to 10.

Further improvement: the ratio of the width of the air outlet of the turbine impeller inlet to the outlet of the turbine impeller and the outlet of the turbine impeller is 0.1 to 10.

Further improvement: The turbine blade includes a turbine impeller inner blade correspondingly disposed within the turbine impeller intake flow passage and a turbine impeller outer blade correspondingly disposed in the turbine impeller intake outer flow passage.

Further improvement: the ratio of the number of blades in the turbine impeller to the outer blades of the turbine impeller is 0.2 to 6. Further improvement: an adjustable valve is arranged in the left flow passage of the volute intake near the volute inlet, and the adjustable valve is connected with the control mechanism.

The outer flow passage of the volute intake air inlet and the outer flow passage of the turbine impeller are normally open flow passages.

When the engine is in the low speed range, the engine exhausts less exhaust gas, and the adjustable valve is under control. The mechanism is driven to be closed, due to the volute intake left flow passage, the turbine impeller intake inner passage intake, the turbine impeller intake inner passage or the volute intake right passage, the turbine impeller The outer air inlet of the air passage and the outer flow passage of the turbine impeller are connected, so that the left side flow passage of the volute intake air, the intake air inlet of the turbine impeller, and the inner flow passage of the turbine impeller are also closed. The exhaust gas discharged by the engine only flows through the right side flow passage of the volute intake air, the intake air inlet of the turbine impeller, and the outer flow passage of the turbine impeller, thereby reducing the flow of gas on the left side of the volute intake air. The sudden expansion of the gas at the air inlet can effectively increase the intake pressure of the turbine outer flow passage and increase the energy of the exhaust gas entering the turbine. The increase of the turbine intake energy will make full use of the energy in the exhaust gas to improve the efficiency of the turbine. Torque output.

In the high-speed operating range of the engine, the engine exhausts a large amount of exhaust gas, and the adjustable valve is opened by the control mechanism, due to the volute intake left flow passage, the turbine impeller intake inner passage intake The turbine impeller inlet flow passage is connected, the volute intake right passage, the turbine impeller intake outer passage intake port, and the turbine impeller intake outer passage are connected, and the exhaust gas discharged from the engine flows through the volute respectively. Gas left flow passage, turbine impeller intake inner passage intake, turbine impeller intake inner passage and volute intake right passage, turbine impeller intake outer passage intake, turbine impeller intake outer passage Work is done to reduce the gas mixing phenomenon of the left side flow passage of the volute intake air and the right side flow passage of the volute intake air at the turbine impeller inlet. The opening of the adjustable door is controlled by the valve control mechanism to properly distribute the gas flow into the two flow paths of the turbine. Due to the different flow capacity of the two flow passages of the turbine, by changing the proportion of the intake air flow entering the two flow passages of the turbine, the exhaust pressure of the engine and the power output of the turbine can be effectively adjusted to satisfy the performance of the engine under medium and high speed conditions. Emission requirements.

Another improvement: an adjustable valve is arranged in the right side flow passage of the volute casing near the volute inlet, and the adjustable valve is connected with the control mechanism.

The left side flow passage of the volute intake and the inner flow passage of the turbine impeller are normally open flow passages.

When the engine is in the low speed range, the engine exhausts less exhaust gas, and the adjustable valve is under control. The mechanism is driven to be closed, due to the volute intake left flow passage, the turbine impeller intake inner passage intake, the turbine impeller intake inner passage or the volute intake right passage, the turbine impeller The outer air inlet of the air passage and the outer flow passage of the turbine impeller are connected, so that the right side flow passage of the volute intake, the inlet of the outer flow passage of the turbine impeller, and the outer flow passage of the turbine impeller are also closed. The exhaust gas from the engine only flows through the left side flow passage of the volute intake air, the intake port of the turbine impeller intake inner passage, and the inner flow passage of the turbine impeller intake, thereby reducing the flow of gas in the right side of the volute intake air. The sudden expansion of gas at the air inlet can effectively increase the intake pressure of the inner passage of the turbine impeller and increase the energy of the exhaust gas entering the turbine. The increase of the turbine intake energy will make full use of the energy in the exhaust gas to improve the efficiency of the turbine. And torque output.

In the high-speed operating range of the engine, the engine exhausts a large amount of exhaust gas, and the adjustable valve is opened by the control mechanism, due to the volute intake left flow passage, the turbine impeller intake inner passage intake The turbine impeller inlet flow passage is connected, the volute intake right passage, the turbine impeller intake outer passage intake port, and the turbine impeller intake outer passage are connected, and the exhaust gas discharged from the engine flows through the volute respectively. Gas left flow passage, turbine impeller intake inner passage intake, turbine impeller intake inner passage and volute intake right flow passage, turbine impeller intake outer passage helium port, turbine impeller intake outer flow path work , thereby reducing the gas mixing phenomenon of the left side flow passage of the volute intake air and the right side flow passage of the volute intake air at the turbine impeller inlet. The valve control mechanism controls the opening of the adjustable valve to properly distribute the gas flow into the two runners of the turbine. Due to the different flow capacity of the two flow passages of the turbine, by changing the proportion of the intake air flow entering the two flow passages of the turbine, the exhaust pressure of the engine and the power output of the turbine can be effectively adjusted to satisfy the performance of the engine under medium and high speed conditions. Emission requirements.

The turbine volute of the invention has the advantages of simple structure, good inheritance and high casting yield; the turbine impeller of the invention can obtain high aerodynamic efficiency and high structural strength by analysis and optimization of modern CFD and FEA technologies; The turbine wheel can be produced using existing casting and processing equipment at a low cost and easily engineered quickly. In summary, the dual-zone turbine can effectively meet the supercharging requirements of the entire operating range of the engine, and can reduce the sudden expansion of the gas at the outlet of the single flow passage of the volute at a small flow rate, further improving the small flow of the turbine. Time efficiency. At normal flow rates, the efficiency of the turbine is increased by reducing the gas mixing phenomenon of the two runner gases at the turbine impeller inlet.

The invention will be further described below in conjunction with the drawings and embodiments.

BRIEF DESCRIPTION OF THE DRAWINGS:

1 is a schematic structural view of a two-channel variable-section turbocharger in the background art of the present invention; FIG. 2 is a schematic structural view of a two-zone turbine in Embodiments 1 and 2 of the present invention; A schematic structural view of a turbine wheel in Embodiment 1 and Embodiment 2;

Figure 4 is a right side view of Figure 3;

Figure 5 is a schematic view showing the installation structure of the adjustable valve in the left side flow passage of the volute casing in the first embodiment of the present invention;

Figure 6 is a schematic view showing the mounting structure of the adjustable valve in the right side flow passage of the volute casing in the second embodiment of the present invention.

In the figure: 1-turbine volute; 2-turbine impeller; 3- volute inlet; 4- volute outlet; 5-intermediate diaphragm; 6-volute intake left runner; 7-volute Intake right side runner; 8-turbine impeller inlet; 9-turbine impeller inlet runner; 10-turbine impeller outlet; 11-divider; 12-turbine impeller inlet flow; 13- turbine impeller Outer air intake passage; 14-turbine impeller inner blade; 15-turbine impeller outer blade; 16-volute intake left flow passage air outlet; 17-turbine impeller intake inner passage air inlet; 18-volute inlet Gas right side runner outlet; 19-turbine impeller inlet runner inlet; 20-adjustable gate; W1-turbine impeller inlet runner inlet width; W2- turbine impeller inlet runner Port width; W3- turbine impeller inlet flow passage outlet width; W4- turbine impeller inlet flow passage outlet width.

detailed description: Embodiment 1, as shown in FIG. 2 and FIG. 3, a dual-zone turbine for turbocharging, comprising a turbine volute 1 in which a turbine wheel 2 is mounted, and an outer portion of the turbine wheel 2 is provided Turbine blades, the volute casing is provided with a volute air inlet 3, a volute inlet flow passage and a volute air outlet 4.

The turbine wheel 2 is provided with a turbine impeller inlet, a turbine impeller inlet passage, a turbine impeller outlet, and a turbine impeller blade.

A partition plate 11 disposed circumferentially between the turbine impeller inlet of the turbine wheel 2 and the turbine impeller outlet port 11 has a shape conforming to aerodynamic performance requirements and reliability requirements.

The partition plate 11 divides the turbine impeller intake passage into a turbine impeller intake inner passage 12 and a turbine impeller intake outer passage 13 .

The turbine impeller inlet passage 12 may adopt a centripetal or mixed flow passage, and the turbine impeller intake passage 13 is generally designed as a centripetal passage, and a special case adopts a mixed flow passage.

The ratio of the turbine impeller intake passage inlet width W1 to the turbine impeller inlet passage inlet width W2 is an arbitrary value between 0.1 and 10.

The ratio of the turbine impeller intake inner passage outlet width W3 to the turbine impeller intake outer passage outlet width W4 is an arbitrary value between 0.1 and 10.

An intermediate partition 5 is disposed in the volute inlet flow passage, and the intermediate partition 5 divides the volute intake flow passage into a volute intake left flow passage 6 and a volute intake right flow passage 7.

The volute intake left flow passage 6 communicates with the turbine impeller intake inner passage 12, and the volute intake right passage 7 communicates with the turbine impeller intake outer passage 13.

The volute intake left flow passage air outlet 16 corresponds to the turbine impeller intake inner flow passage intake port 17, and the volute intake right flow passage air outlet 18 and the turbine impeller intake The outer flow passage inlets 19 correspond.

As shown in FIG. 4, the turbine blades include turbine blades correspondingly disposed within the turbine impeller intake passage 12 The in-wheel blade 14 and the turbine wheel outer blade 15 correspondingly disposed in the turbine wheel intake outer flow passage 13 are provided. The ratio of the number of turbine blades 14 and the turbine blade outer blades 15 is any value between 0.2 and 6.

As shown in FIG. 5, an adjustable valve 20 is disposed in the left side flow passage 6 of the volute intake air near the volute air inlet 3, and the adjustable valve 20 is connected to the control mechanism and driven by the control mechanism. The rotation of the adjustable valve 20 is effected to open and close the volute intake left flow passage 6.

When the engine is in the low speed range, the engine exhausts less exhaust gas, and the adjustable valve 20 is closed under the control mechanism, so the volute intake left runner 6 and the turbine impeller intake runner The gas port 17 and the turbine impeller inlet flow passage 12 are also in a closed state, and the exhaust gas discharged from the engine flows only through the volute intake right flow passage 7, the turbine impeller intake outer passage intake port 19, and the turbine impeller. The intake outer flow passage 13 performs work, thereby reducing the sudden expansion of gas at the gas outlet 16 of the left side flow passage of the volute intake air, thereby effectively increasing the intake pressure of the turbine impeller intake flow passage 13 and increasing the entering the turbine. Exhaust gas energy; The increase in turbine intake energy will make full use of the energy in the exhaust gas to improve turbine efficiency and torque output.

In the high-speed operating range of the engine, the engine exhausts a large amount of exhaust gas, and the adjustable valve 20 is opened under the control mechanism, due to the volute intake left flow passage 6, the turbine impeller intake inner flow passage The gas port 17 and the turbine impeller inlet flow passage 12 communicate with each other, and the volute intake right flow passage 7, the turbine impeller intake outer passage intake port 19, and the turbine impeller intake outer passage 13 communicate with each other, and are discharged by the engine. The exhaust gas flows through the volute intake left flow passage 6, the turbine impeller intake inner passage intake port 17, the turbine impeller intake inner passage 12, the volute intake right passage 7, and the turbine impeller intake. The air inlet 19 and the turbine impeller outer flow passage 13 work to reduce the gas mixing phenomenon of the volute intake left flow passage 6 and the volute intake right flow passage 7 gas at the turbine impeller inlet. The opening of the adjustable wide door 20 is controlled by a valve control mechanism to properly distribute the flow of gas into the two flow passages of the turbine. Due to the flow capacity of the two runners of the turbine Similarly, by changing the proportion of the intake air flow into the two flow passages of the turbine, the exhaust pressure of the engine and the power output of the turbine can be effectively adjusted to meet the performance and emission requirements of the engine under medium and high speed conditions.

Embodiment 2, as shown in FIG. 6, on the basis of Embodiment 1, the adjustable valve 20 in the left side flow passage 6 of the volute intake air near the volute air inlet 3 is removed, and the volute intake air is in the volute The adjustable flow valve 20 is disposed near the ventilator inlet 3, and the adjustable valve 20 is connected to the control mechanism, and the rotation of the adjustable valve 20 is realized by the control mechanism, so that the volute enters The gas right side runner 7 opens and closes.

When the engine is in the low speed range, the engine exhausts less exhaust gas, and the adjustable valve 20 is closed under the control of the control mechanism, so the volute intake right flow passage 7, the turbine impeller intake outer passage intake The port 19 and the turbine impeller intake flow passage 13 are also closed. The exhaust gas discharged from the engine only flows through the volute intake left flow passage 6, the turbine impeller intake inner passage intake port 17, and the turbine impeller. The gas inner flow channel 12 performs work, thereby reducing the sudden expansion of gas at the gas outlet port 18 of the right side flow passage of the volute intake air, which can effectively increase the intake pressure of the turbine inner flow passage 12 and increase the flow into the turbine. Exhaust gas energy; the increase in turbine intake energy will make full use of the energy in the exhaust gas to improve turbine efficiency and torque output.

Claims

Rights request

1. A dual-zone turbine for turbocharging, including a turbine volute (1), a turbine impeller (2) installed inside the turbine volute (1), and turbine blades provided on the outside of the turbine impeller (2). The turbine volute is provided with a volute air inlet (3), a volute air inlet flow path and a volute air outlet (4); the turbine impeller (2) is provided with a turbine impeller air inlet flow path; It is characterized by: : The partition plate (11) is installed, and the partition plate (11) divides the turbine impeller air inlet flow path into the turbine impeller air inlet inner flow path (12) and the turbine impeller air inlet outer flow path (13).

2. The dual-zone turbine for turbocharging according to claim 1, characterized in that: an intermediate partition (5) is provided in the volute air inlet runner, and the intermediate partition (5) The volute air inlet flow channel is divided into the volute case air inlet left side flow channel (6) and the volute case air inlet right side flow channel (7);

The volute air inlet left flow channel (6) is connected to the turbine impeller air inlet inner flow channel (12), and the volute air inlet right flow channel (7) is connected to the turbine impeller air inlet outflow Road (13) is connected.

3. The dual-zone turbine for turbocharging according to claim 2, characterized in that: the left side of the volute air inlet flow channel (6) is provided with a left side of the volute air inlet near the turbine impeller (2). Side flow channel air outlet (16); The volute air inlet right side flow channel (7) is provided with a volute air inlet right side flow channel air outlet (18) near the turbine impeller (2);

The turbine impeller air inlet inner flow channel (12) is provided with a turbine impeller air inlet inner flow channel air inlet (17) corresponding to the volute air inlet left side flow channel air outlet (16);

The turbine impeller air inlet outer flow channel (13) is provided with a turbine impeller air inlet outer flow channel air inlet (19) corresponding to the flow channel outlet (18) on the right side of the volute air inlet.

4. The dual-zone turbine for turbocharging according to claim 3, characterized in that: the turbine impeller air inlet inner flow passage (12) is a centripetal passage.

5. The dual-zone turbine for turbocharging according to claim 3, characterized in that: the turbine impeller air inlet inner flow passage (12) is a mixed flow passage.

6. The dual-zone turbine for turbocharging according to claim 3, characterized in that: the turbine impeller air inlet outer flow channel (13) is a centripetal channel.

7. The dual-zone turbine for turbocharging according to claim 3, characterized in that: the turbine impeller air inlet outer flow channel (13) is a mixed flow channel.

8. The dual-zone turbine for turbocharging according to any one of claims 4 to 7, characterized in that:

The ratio of the width of the turbine impeller air inlet inner flow channel air inlet (W1) to the turbine impeller air inlet outer flow channel air inlet width (W2) is 0.1~10.

9. The dual-zone turbine for turbocharging according to claim 8, characterized in that: the turbine impeller air inlet inner flow channel outlet width (W3) and the turbine impeller air inlet outer flow channel outlet width (W3) The ratio of W4) is 0.1~10.

10. The dual-zone turbine for turbocharging according to claim 9, characterized in that: the turbine blades include turbine impeller inner blades (14) correspondingly arranged in the turbine impeller inlet inner flow passage (12) and Corresponds to the turbine impeller outer blade (15) arranged in the turbine impeller air inlet outer flow passage (B).

11. The dual-zone turbine for turbocharging according to claim 10, characterized in that: the number ratio of the turbine impeller inner blades (14) and the turbine impeller outer blades (15) is 0.2~6.

12. The dual-zone turbine for turbocharging according to claim 11, characterized in that: there is a volute air inlet left side flow channel (6) close to the volute air inlet (3). Adjustable valve (20), the adjustable valve (20) is connected with the control mechanism.

13. The dual-zone turbine for turbocharging according to claim 11, characterized in that: there is a flow channel (7) on the right side of the volute air inlet near the volute air inlet (3). Adjustable valve (20), described The adjustable valve (20) is connected to the control mechanism -