Multi-stage shunting bent pipe type particle separation device
By designing a multi-stage diversion bending type particle separation device, the structure of the mainstream intake channel and multi-stage sand runner is utilized, combined with the design of the separation lip and the flow guide, the low efficiency and weight of sand and dust separation in the prior art are solved. The big problem has achieved efficient and lightweight sand and dust separation effect, which is suitable for high-speed flight helicopters.
Patent Information
- Application Number
- CN202411440077.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-15
- Publication Date
- 2025-02-14
AI Technical Summary
The sand and dust separation efficiency in the intake of existing engines is low, and the multi-tube particle separator has a large weight and aerodynamic resistance, making it not suitable for helicopters that fly at high speed.
Design a multi-stage diversion pipe-type particle separation device to improve sand through the multi-stage separation structure of the main flow inlet, the first row of sand runner and the second row of sand runner. Dust separation efficiency.
It achieves efficient sand and dust separation, reduces aerodynamic drag and weight, and is suitable for high-speed flight helicopters.
Smart Images
Figure CN119435207A_ABST
Abstract
Description
Technical Field
[0001] The present application belongs to the technical field of engine air intake, and specifically relates to a multi-stage diversion curved pipe type particle separation device. Background Art
[0002] When the engine is working, a large amount of cold air is sucked in from the air intake for engine combustion. Since the compressor and power turbine inside the engine are high-speed moving parts, when there is sand and dust in the intake air, the sand and dust will damage the high-speed rotating parts of the engine such as the turbine. Therefore, it is necessary to separate the sand and dust in the engine intake air so that the air entering the engine is clean gas.
[0003] However, according to the typical usage scenarios and environmental adaptability requirements of helicopters, helicopters need to have the ability to take off and land and fly normally in environments with high concentrations of sand and dust, rain and snow, so it is inevitable that the engine intake will inhale air containing sand and dust; in order to improve the efficiency of sand and dust separation in the intake air.
[0004] At present, the widely used ones are multi-tube particle separators, integral separators and barrier particle separators; however, although the multi-tube particle separator has a high separation efficiency, it has a large windward area, large aerodynamic resistance and heavy weight, which is not conducive to high-speed flight of helicopters; the integral particle separator is a particle separator that comes with the engine, and its structure is compactly integrated on the engine, but the separation efficiency of sand and dust is low and there are certain limitations; and the barrier particle separator is only a sand prevention net, and the sand prevention efficiency is low for particles with smaller particle sizes.
[0005] Therefore, it is particularly important to design a new particle separator with high sand and dust separation efficiency, light weight and small aerodynamic resistance for high-speed flying aircraft. Summary of the invention
[0006] Purpose of the invention: The present invention provides an efficient curved pipe particle separation device, which improves the sand and dust separation efficiency through multi-stage separation of sand and dust and special devices in the air intake duct, while reducing aerodynamic resistance, air intake installation loss and weight.
[0007] The present application provides a multi-stage split-flow curved pipe type particle separation device, the device comprising:
[0008] A mainstream air inlet passage having a first throat;
[0009] a first sand discharge channel connected to the first throat;
[0010] A second sand discharge channel has a second throat, and one end of the second sand discharge channel is connected to the first throat;
[0011] An engine air intake duct, one end of which is connected to the first throat or the second throat, and the other end of which is connected to the engine.
[0012] Preferably, the first throat portion and the second throat portion both comprise separation lips, and the separation lips are used to separate sand and dust in the airflow from the air.
[0013] Preferably, the other end of the first sand discharge channel can discharge sand and dust into the atmosphere; the other end of the second sand discharge channel can discharge sand and dust into the atmosphere.
[0014] Preferably, the other end of the second sand discharge channel is connected to the first sand discharge channel.
[0015] Preferably, the mainstream air inlet channel is a double-layer tube, the first sand discharge channel is a double-layer tube, and the second sand discharge channel is a double-layer tube.
[0016] Preferably, the double-layer tube comprises:
[0017] The inner layer has round holes;
[0018] The outer layer has a gap between it and the inner layer.
[0019] Preferably, a guide vane is provided at the separation lip.
[0020] Preferably, one end of the engine air inlet is an air inlet, and the direction of the air inlet is consistent with the flow direction of the airflow;
[0021] The air inlet extends from the first throat portion into the first sand discharge channel, or the air inlet extends from the second throat portion into the second sand discharge channel.
[0022] This application has the following technical effects:
[0023] 1) The multi-stage separation flow channel is adopted, which can separate the sand and dust in multiple stages, thereby achieving the effect of improving the separation of sand and dust;
[0024] 2) The multi-stage separated sand discharge flow channels can be combined or discharged separately, which can realize the separate utilization of the multi-stage sand discharge flow channels. The air with less sand and dust can cool the hot parts of the engine or high-temperature exhaust or radiator;
[0025] 3) A multi-layer sand and dust separation flow channel is adopted. The sand and dust are not only separated at the separation lip of the elbow flow channel, but also the dense net in the flow channel can separate the sand and dust;
[0026] 4) A guide vane is added at the separation lip of the sand discharge channel to change the gas flow direction at the separation lip, so that the separation efficiency of sand and dust is further improved;
[0027] 5) A fan is added at the air inlet of the multi-stage exhaust flow channel to increase the flow rate of the air inlet, thereby increasing the inertia difference between sand and dust and air, thereby achieving the effect of improving sand and dust separation. BRIEF DESCRIPTION OF THE DRAWINGS
[0028] Figure 1 It is a structural schematic diagram of a multi-stage split-flow curved pipe type particle separation device provided in an embodiment of the present application;
[0029] Figure 2 It is a schematic structural diagram of another multi-stage splitting curved pipe type particle separation device provided in the present embodiment;
[0030] Figure 3 It is a structural schematic diagram of another multi-stage splitting curved pipe type particle separation device provided in an embodiment of the present application;
[0031] Figure 4 It is a structural schematic diagram of a multi-stage split-flow curved pipe type particle separation device provided in another embodiment of the present application;
[0032] Figure 5 It is a structural schematic diagram of a multi-stage split-flow curved pipe type particle separation device provided by another embodiment of the present application;
[0033] Figure 6 It is a structural schematic diagram of a multi-stage split-flow curved pipe type particle separation device provided by another embodiment of the present application;
[0034] Among them, 1-mainstream air inlet; 2-throat; 3-separation lip; 4-first row of sand flow channel; 5-second row of sand flow channel; 6-engine air inlet; 7-ejector; 8-engine air inlet; 9-guide vane; 10-boost air inlet. DETAILED DESCRIPTION
[0035] See also Figure 1-Figure 6 , a multi-stage split-flow curved pipe particle separation device (such as Figure 1 The present invention is a design method of a multi-stage split elbow particle separation device, which realizes multi-stage sand and dust separation on the incoming air and improves the efficiency of sand and dust separation. The multi-stage separation elbow particle separation device mainly includes an intake air channel, a sand discharge channel, an engine air intake and other components.
[0036] Preferably, Figure 1 The curved pipe type particle separation device shown has only two-stage sand and dust separation, and the curved pipe type particle separation device can separate sand and dust at multiple stages, and the air containing sand and dust in the multiple-stage flow passage can cool the engine body or the engine high-temperature exhaust gas and the radiator.
[0037] Preferably, Figure 1The two-stage sand and dust separation pipes of the curved pipe type particle separation device shown in the figure are independent of each other, and the sand and dust separation pipes of the multi-stage curved pipe type particle separation device can be independent of each other or merged into one. Figure 2 As shown;
[0038] Preferably, the curved tube particle separation device has multiple layers of wall surfaces, and the inner wall surface is a dense and porous mesh structure. The multi-stage curved tube particle separation device not only uses inertia to separate sand and dust particles from air, but also the inner porous wall surface can further separate sand and dust from air. When air containing sand and dust enters the flow channel, the mesh structure prevents sand and dust with larger particle sizes from entering the engine's air intake duct, thereby further improving the separation efficiency.
[0039] Preferably, the multi-stage curved pipe particle separation device has a guide plate in the flow channel, so that the sand and dust flowing into the engine intake channel re-flows into the sand and dust flow channel due to the effect of the baffle, thereby achieving the effect of sand and dust separation;
[0040] Preferably, a vent hole can be added to the lip of the multi-stage curved pipe particle separation device, and a high-speed airflow is discharged from the vent hole, so that the sand and dust at the separation lip are blown into the sand discharge channel by the high-speed airflow, thereby achieving the effect of improving the sand and dust separation efficiency;
[0041] Preferably, an ejector is added to the sand discharge channel of the multi-stage curved pipe particle separation device. The ejector may be an engine exhaust system or an exhaust fan. The ejector is used to increase the air flow rate in the sand discharge channel, thereby further improving the efficiency of sand and dust separation.
[0042] In other embodiments of the present application, the gas containing sand and dust enters the mainstream air intake duct 1 and enters the throat 2 of the air intake duct. Since the weight of the sand and dust particles is heavier than that of the air and the inertia of the sand and dust particles is larger, the sand and dust are separated from the air under the action of the separation lip 3 and the centrifugal force of the throat air intake duct. A part of the air carries most of the sand and dust into the first sand discharge flow channel 4, and a part of the air carries a small amount of sand and dust into the second sand discharge flow channel 5. Then, the air entering the second sand discharge flow channel is further separated from the sand and dust under the action of the separation lip of the second sand discharge flow channel and the centrifugal force of the curved pipe air intake duct, so that the sand and dust content in the air is further reduced to meet the use requirements of the engine. Clean air enters the engine through the engine air intake duct 6. The air in the first sand discharge flow channel and the second sand discharge flow channel can be directly discharged into the atmosphere with the sand and dust, or can be connected to an ejector. Through the suction effect of the ejector, the flow rate in the sand discharge flow channel is increased, thereby improving the separation efficiency of the sand and dust. Please refer to Figure 1 .
[0043] The dust-containing gas enters the mainstream air intake duct 1 and then the throat 2 of the air intake duct. Since the dust particles are heavier than the air and have a greater inertia, the dust and air are separated under the centrifugal force of the separation lip 3 and the throat air intake duct. A part of the air carries most of the dust into the first sand discharge channel 4, and a part of the air carries a small amount of dust into the second sand discharge channel 5. Then, the air entering the second sand discharge channel is further separated from the dust under the centrifugal force of the separation lip and the curved pipe air intake duct of the second sand discharge channel, so that the dust content in the air is further reduced to meet the engine's use requirements. Clean air enters the engine through the engine air intake duct 6. The second sand discharge channel can be directly connected to the first sand discharge channel, and the high-speed gas flowing in the first sand discharge channel is used to suck the air in the second flow channel to improve the sand and dust separation efficiency of the second sand discharge channel. Please refer to Figure 2 .
[0044] The dust-containing gas enters the mainstream double-layer intake duct 1. Since the inner flow channel of the double-layer flow channel has small holes, it has a one-way filtering effect on the dust (the small holes are funnel-shaped, with large inside and small outside). After the dust passes through the small holes in the inner flow channel, due to the one-way filtering effect of the inner flow channel, the dust always flows in the outer flow channel. Moreover, when it enters the throat 2 of the double-layer intake duct, the dust is further separated from the air under the action of the separation lip 3 and the centrifugal force of the throat intake duct. Moreover, under the separation effect of the multi-stage flow channel, the separation efficiency of the dust is further improved, so that the dust content of the air entering the engine intake port is lower. Please refer to Figure 3 .
[0045] The sand-containing gas enters the main inlet duct 1 and enters the throat 2 of the inlet duct. A guide vane 9 is arranged at the separation lip of the throat of the inlet duct. When the air enters the second row of sand flow channels or the engine inlet duct, the air will hit the guide vane therein, and the guide vane will rebound some sand and dust particles to the first row of sand flow channels, so that the separation efficiency of sand and dust is further improved. Figure 4 .
[0046] The dust-containing gas enters the mainstream air intake duct 1 and enters the throat 2 of the air intake duct. A supercharged air intake duct 10 is arranged at the separation lip of the throat of the air intake duct. High-speed airflow is discharged from the supercharged air intake duct to impact the air in the flow duct, thereby increasing the air flow rate in the flow duct and further increasing the centrifugal force on the dust in the throat of the air intake duct, thereby further improving the separation efficiency of the dust. Figure 5 .
[0047] The sand-dust-containing gas enters the mainstream air inlet 1 and then the throat 2 of the air inlet. Since the sand-dust particles are heavier than the air and have a larger inertia, the sand-dust particles are separated from the air by the centrifugal force of the separation lip 3 and the throat air inlet. Then the air inlet of the second sand flow channel deviates from the air flow direction. Since the inertia of the sand-dust is larger, the sand-dust content of the air entering the second sand flow channel will be further reduced, thereby further improving the sand-dust separation efficiency. Figure 6 .
Claims
1. A multi-stage split-flow curved pipe particle separation device, characterized in that: The device comprises: A mainstream air inlet passage having a first throat; a first sand discharge channel connected to the first throat; A second sand discharge channel has a second throat, and one end of the second sand discharge channel is connected to the first throat; An engine air intake duct, one end of which is connected to the first throat or the second throat, and the other end of which is connected to the engine.
2. The method according to claim 1, characterized in that The first throat portion and the second throat portion both include a separation lip, and the separation lip is used to separate sand and dust in the air flow from the air.
3. The method according to claim 1, characterized in that The other end of the first sand discharge channel can discharge sand and dust into the atmosphere; the other end of the second sand discharge channel can discharge sand and dust into the atmosphere.
4. The method according to claim 1, characterized in that: The other end of the second sand discharge channel is connected to the first sand discharge channel.
5. The method according to claim 1, characterized in that The main flow inlet channel is a double-layer tube, the first sand discharge channel is a double-layer tube, and the second sand discharge channel is a double-layer tube.
6. The method according to claim 5, characterized in that The double-layer tube comprises: The inner layer has round holes; The outer layer has a gap between it and the inner layer.
7. The method according to claim 2, characterized in that A guide vane is arranged at the separation lip.
8. The method according to claim 1, characterized in that One end of the engine air intake passage is an air intake port, and the direction of the air intake port is consistent with the flow direction of the airflow; The air inlet extends from the first throat portion into the first sand discharge channel, or the air inlet extends from the second throat portion into the second sand discharge channel.