An anti-gas-explosion structure and its auxiliary power device

Abstract

This invention provides an anti-surge venting structure and an auxiliary power device having the same, belonging to the field of engine technology. It includes: a venting pipe seat with a venting end, the venting end having a venting port on its side, the venting pipe seat being adapted to pass through a tailpipe, and the venting port of the venting end being adapted to face the tail of the tailpipe; a guide plate disposed at the end of the venting end for blocking gas from being ejected in a straight line from the end of the venting pipe seat. The anti-surge venting structure of this invention, by providing a guide plate at the end of the venting end of the venting pipe seat, can block gas from being ejected in a straight line from the end of the venting pipe seat, thereby avoiding the problem of high-pressure gas discharged from the anti-surge venting end directly blowing onto the exhaust temperature sensor installed on the tailpipe, causing exhaust temperature measurement distortion.

Description

Technical Field

[0001] This invention relates to the field of engine technology, and specifically to an anti-surge and deflation structure and an auxiliary power device having the same. Background Technology

[0002] The auxiliary power unit (APU) is a small to medium-power gas turbine engine that primarily provides compressed air for the starting and environmental control systems of the aircraft's main engines. When the APU bleeds air, the bleed air pressure increases to meet operational requirements, causing the compressor operating point to gradually approach the surge boundary, ultimately triggering surge.

[0003] Chinese patent document CN112937885A discloses an air bleed system that uses an auxiliary power device for air bleed. An air bleed valve and an anti-surge valve are arranged in parallel at the outlet of the load compressor. The anti-surge valve is used to release excess gas to prevent the load compressor from surging.

[0004] However, in the above scheme, the anti-surge venting end faces directly towards the inner wall of the tailpipe. The high-pressure gas discharged from the anti-surge venting end will blow directly onto the exhaust temperature sensor on the inner wall of the tailpipe, which can easily lead to distortion of the exhaust temperature measurement. Summary of the Invention

[0005] Therefore, the technical problem to be solved by the present invention is to overcome the defect in the prior art where the high-pressure gas discharged from the anti-surge venting end directly blows into the temperature sensor, causing the exhaust temperature measurement to be distorted, thereby providing an anti-surge venting structure and an auxiliary power device having therein.

[0006] To solve the above-mentioned technical problems, the present invention provides an anti-breathing and deflation structure, comprising:

[0007] A vent pipe seat has a vent end, and a vent port is provided on the side of the vent end. The vent pipe seat is adapted to pass through the tail nozzle, and the vent port of the vent end is adapted to face the tail of the tail nozzle.

[0008] A deflector plate is disposed at the end of the venting end to prevent gas from being ejected in a straight line from the end of the venting pipe seat.

[0009] Optionally, the deflector extends obliquely toward the vent in the direction of airflow.

[0010] Optionally, the vent pipe seat includes a cylindrical section and an elliptical cylindrical section, and the vent is disposed on the elliptical cylindrical section along the short side of the elliptical cylindrical section.

[0011] Optionally, the cross-sectional areas of the cylindrical segment and the elliptical cylindrical segment are equal.

[0012] Optionally, it also includes: a positioning boss connected to the outer wall of the vent pipe seat.

[0013] Optionally, the side of the positioning boss facing the venting end is an arc-shaped surface suitable for fitting with the outer wall of the tail nozzle.

[0014] Optionally, the positioning boss is an annular structure surrounding the outer wall of the vent pipe seat.

[0015] Optionally, it also includes: a mounting base, one end of which is sealed to the end of the vent pipe seat away from the vent end, and the other end of which is adapted to be connected to the vent pipe.

[0016] Optionally, one end of the mounting base for connecting to the vent pipe seat has a step for abutting against the end of the vent pipe seat after insertion into it.

[0017] The present invention provides an auxiliary power device, comprising: the anti-surge and deflation structure described in any of the above embodiments.

[0018] The technical solution of this invention has the following advantages:

[0019] 1. The anti-surge venting structure provided by the present invention has a guide plate at the venting end of the venting pipe seat. The guide plate can block the gas from being sprayed out in a straight line from the end of the venting pipe seat, thereby avoiding the problem of high-pressure gas discharged from the anti-surge venting end blowing directly into the exhaust temperature sensor installed on the tail nozzle, causing the exhaust temperature measurement to be distorted.

[0020] 2. The anti-surge venting structure provided by this invention, because the venting end of the venting pipe seat passes through the tailpipe and the venting port faces the tail of the tailpipe, can prevent fuel discharged during the "false start" of the auxiliary power unit from entering the anti-surge venting pipe and forming liquid accumulation, thereby ensuring the safe operation of the entire machine. Furthermore, the venting port has a certain distance from the inner wall surface of the tailpipe, which also prevents fuel from flowing along the inner wall surface of the tailpipe to the venting port, avoiding the formation of liquid accumulation in the anti-surge venting pipe.

[0021] 3. The anti-surge and deflation structure provided by the present invention has an elliptical cylindrical section for the portion of the deflation tube seat that passes through the tail nozzle, and the deflation port at the deflation end is set along the short side of the elliptical cylindrical section. Therefore, when the deflation tube seat is installed on the tail nozzle and the deflation port at the deflation end faces the tail of the tail nozzle, the short side of the elliptical cylindrical section of the tail nozzle is parallel to the axis of the tail nozzle. This setting can reduce the axial length occupied by the installation of the deflation tube seat, thereby minimizing the axial length of the auxiliary power device.

[0022] 4. The auxiliary power device provided by the present invention has the advantages described in any of the above-mentioned items because it adopts the above-mentioned anti-surge and deflation structure. Attached Figure Description

[0023] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0024] Figure 1 This is a front sectional view of one embodiment of the anti-gas-deflating structure provided in the embodiments of the present invention;

[0025] Figure 2 for Figure 1 Front sectional view of the vent pipe seat;

[0026] Figure 3 This is a right view of the vent pipe seat;

[0027] Figure 4 This is a top view of the vent pipe seat;

[0028] Figure 5 This is a front view of one embodiment of the auxiliary power unit provided in the embodiments of the present invention.

[0029] Explanation of reference numerals in the attached figures:

[0030] 1. Bleeding pipe seat; 2. Bleeding end; 3. Bleeding port; 4. Tail nozzle; 5. Guide vane; 6. Elliptical cylindrical section; 7. Cylindrical section; 8. Positioning boss; 9. Mounting seat; 10. Step; 11. Bleeding pipe; 12. Compressor; 13. Starter; 14. Turbine; 15. Combustion chamber. Detailed Implementation

[0031] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0032] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0033] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0034] Furthermore, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0035] This embodiment provides an anti-surge air release structure for releasing high-pressure air discharged by the auxiliary power device due to anti-surge requirements.

[0036] like Figure 1-2 The diagram illustrates a specific implementation of an anti-gas-explosion structure provided in this embodiment, comprising: a gas venting pipe seat 1 and a guide plate 5. The gas venting pipe seat 1 has a gas venting end 2, and a gas venting port 3 on the side of the gas venting end 2. The gas venting pipe seat 1 is adapted to pass through a tailpipe 4, and the gas venting port 3 of the gas venting end 2 is adapted to face the tail of the tailpipe 4. The guide plate 5 is disposed at the end of the gas venting end 2, and the guide plate 5 is used to prevent gas from being ejected in a straight line from the end of the gas venting pipe seat 1.

[0037] The anti-surge venting structure provided in this embodiment has a guide plate 5 at the end of the venting end 2. The guide plate 5 can block the gas from being sprayed out in a straight line from the end of the venting pipe seat 1, thereby avoiding the problem of high-pressure gas discharged from the anti-surge venting end blowing directly into the exhaust temperature sensor installed on the tail nozzle 4, causing the exhaust temperature measurement to be distorted.

[0038] like Figure 1 As shown, in the anti-surge venting structure provided in this embodiment, after the venting end 2 of the venting pipe seat 1 passes through the tail nozzle 4, there is a certain distance between the venting port 3 of the venting end 2 and the inner wall surface of the tail nozzle 4. This setting can prevent the fuel discharged during the "fake start" of the auxiliary power unit from entering the anti-surge venting pipe and forming liquid accumulation, thereby ensuring the safety of the whole machine operation.

[0039] like Figure 1 , Figure 2 As shown, in the anti-surge and deflation structure provided in this embodiment, the guide plate 5 extends obliquely towards the deflation port 3 along the direction of airflow. Specifically, the guide plate 5 can be set to form a 120° angle with the inner wall of the deflation pipe seat 1. This setting can avoid the problem of vortex formation at the turning point when the airflow suddenly turns upon encountering the guide plate 5, which would cause vibration, thereby improving the stability of operation at the anti-surge and deflation end.

[0040] like Figure 1-4 As shown, in the anti-surge and deflation structure provided in this embodiment, the deflation pipe seat 1 includes a cylindrical section 7 and an elliptical cylindrical section 6. The cylindrical section 7 is used to connect the deflation pipe, and the elliptical cylindrical section 6 is used to connect the tail nozzle 4. The deflation port 3 is disposed on the elliptical cylindrical section 6, and the deflation port 3 is positioned rearward along the short side of the elliptical cylindrical section 6. With this configuration, when the deflation pipe seat 1 is installed onto the tail nozzle 4, the deflation port 3 of the deflation end 2 faces the tail of the tail nozzle 4, and the short side of the elliptical cylindrical section 6 of the tail nozzle 4 is parallel to the axis of the tail nozzle 4. This configuration reduces the axial length occupied by the installation of the deflation pipe seat 1, thereby minimizing the axial length of the auxiliary power unit.

[0041] like Figure 2 As shown, in the anti-surge and deflation structure provided in this embodiment, the cross-sectional area of ​​the cylindrical segment 7 and the cross-sectional area of ​​the elliptical cylindrical segment 6 are equal. This arrangement ensures that the high-pressure gas can be discharged to the tail nozzle 4 at a stable pressure during the process of passing through the deflation pipe seat 1, thereby avoiding vibration and improving the stability of the anti-surge and deflation end.

[0042] like Figure 3-4 As shown, the anti-surge and deflation structure provided in this embodiment further includes a positioning boss 8, which is connected to the outer wall of the deflation tube seat 1. The positioning boss 8 is used to limit the position of the deflation tube seat 1, thereby facilitating the positioning and welding of the deflation tube seat 1.

[0043] like Figure 1-3 As shown, in the anti-surge and deflation structure provided in this embodiment, the side of the positioning boss 8 facing the deflation end 2 is an arc-shaped surface suitable for mating with the outer wall of the tail nozzle 4. This design ensures precise fit between the positioning boss 8 and the tail nozzle 4.

[0044] like Figure 1-3 As shown, in the anti-surge and deflation structure provided in this embodiment, the positioning boss 8 is an annular structure surrounding the outer wall of the deflation tube seat 1. Setting the positioning boss 8 as an annular structure ensures the sealing of the connection with the deflation tube seat 1, thereby preventing the leakage of high-pressure gas.

[0045] like Figure 1 As shown, the anti-surge and deflation structure provided in this embodiment further includes: a mounting base 9, one end of which is sealed to the end of the deflation pipe seat 1 furthest from the deflation end 2, and the other end of which is adapted to be connected to the deflation pipe. Using the mounting base 9 to connect the deflation pipe seat 1 and the deflation pipe can improve the convenience of connecting the deflation pipe seat 1 and the deflation pipe, and facilitate the connection of the deflation pipe after installing the deflation pipe seat 1 onto the tailpipe 4.

[0046] like Figure 1As shown, in the anti-surge and deflation structure provided in this embodiment, one end of the mounting base 9 for connecting the deflation tube seat 1 has a step 10 for abutting against the end of the deflation tube seat 1 after insertion. This arrangement allows the deflation tube seat 1 to smoothly abut against the step 10 at the end of the mounting base, thereby achieving a fixed installation of the two.

[0047] like Figure 5 As shown, this embodiment also provides an auxiliary power unit, employing the anti-surge and bleed-out structure described above. Specifically, it includes: a compressor 12, a starter 13, a turbine 14, a combustion chamber 15, and a bleed-out pipe 11. The combustion gas released during the operation of the combustion chamber 15 passes through the turbine 14, causing the turbine 14 to rotate at high speed and discharge the gas to the tail nozzle 4. The turbine 14 drives the compressor 12 to operate; after the compressor 12 compresses the air, it delivers it to the starter 13. During the bleed-out process, to prevent engine surge, the starter 13 releases excess high-pressure gas through the bleed-out pipe 11 and discharges it to the tail nozzle 4 through the bleed-out pipe seat 1.

[0048] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.

Claims

1. An auxiliary power device, characterized by include: The compressor (12), starter (13), turbine (14), combustion chamber (15) and exhaust pipe (11) are provided. The gas flow released by the combustion chamber (15) passes through the turbine (14) and causes the turbine (14) to rotate at high speed, and exhausts the gas to the tail nozzle (4). The turbine (14) drives the compressor (12) to work. After the compressor (12) compresses the air, it delivers it to the starter (13). During the bleed process, the starter (13) releases excess high-pressure gas through the bleed pipe (11) and discharges it to the tail nozzle (4) through the bleed pipe seat (1). The vent pipe seat (1) has a cylindrical section (7) and an elliptical cylindrical section (6) connected in sequence. The cross-sectional areas of the cylindrical section (7) and the elliptical cylindrical section (6) are equal. The elliptical cylindrical section (6) forms a vent end (2). The side of the vent end (2) has a vent port (3). The vent pipe seat (1) passes through the tail nozzle (4). The vent port (3) of the vent end (2) faces the tail of the tail nozzle (4). A guide plate (5) is provided at the end of the venting end (2). The guide plate (5) extends obliquely toward the venting port (3) in the direction of airflow to block high-pressure gas from being ejected straight out from the end of the venting pipe seat (1).

2. The assistive power device of claim 1, wherein, Also includes: The positioning boss (8) is connected to the outer wall of the vent pipe seat (1).

3. An auxiliary power device according to claim 2, characterised in that, The side of the positioning boss (8) facing the vent end (2) is an arc-shaped surface suitable for fitting with the outer wall of the tail nozzle (4).

4. An auxiliary power device according to claim 3, characterised in that, The positioning boss (8) is an annular structure surrounding the outer wall of the vent pipe seat (1).

5. The auxiliary power unit according to any one of claims 1-4, characterized in that, Also includes: The mounting base (9) has one end sealed to the end of the vent pipe seat (1) away from the vent end (2), and the other end is adapted to be connected to the vent pipe.

6. The auxiliary power device according to claim 5, characterized in that, The mounting base (9) has a step (10) at one end for connecting to the vent pipe seat (1) for inserting into the vent pipe seat (1) and abutting against the end of the vent pipe seat (1).

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