Aircraft bleed air precooler control valve

Abstract

This invention belongs to the field of control valve technology and discloses a control valve for an aircraft bleed air precooler, including a control device and a bleed air valve body mounted on the control device. It also includes a reverse double-threaded screw and a valve core assembly rotatably connected to the bleed air valve body. The valve core assembly is mounted on the reverse double-threaded screw, and a set of sealing rings are symmetrically fixed to the bleed air valve body. The above solution uses a drive motor to rotate the reverse double-threaded screw and valve core assembly 90 degrees, causing the valve core plate to rotate perpendicular to the axis of the bleed air valve body. The rotation of the reverse double-threaded screw drives the sleeve components to rotate. Continued rotation of the reverse double-threaded screw drives the two sets of sleeve components to move towards each other, and through a connecting rod, pushes the valve core plate towards and into contact with the sealing rings, thereby achieving a hard seal on the bleed air valve body and preventing wear of the valve core plate when sealing the bleed air valve body.

Description

Technical Field

[0001] This invention belongs to the field of control valve technology, specifically a control valve for an aircraft bleed air precooler. Background Technology

[0002] The precooler control valve (PCCV) is the core control component of the engine bleed air precooler system, forming the cooling system together with the precooler, 390-degree temperature sensor, and signal piping. As a key component of the aircraft bleed air system, its main function is to control the cooling intensity of the hot bleed air by adjusting the flow rate of the cooling medium (fan air). The larger the valve opening, the more cold air flows through the precooler, the stronger the heat exchange effect, and the lower the bleed air temperature.

[0003] The control valve of the precooler achieves reliable sealing and flow control under high temperature and high pressure through the cooperation of the metal hard-seal valve core and valve body structure. However, during frequent opening and closing, the rigid contact surface between the valve core and the valve body will wear due to continuous sliding friction, which will lead to a decrease in sealing performance and pressure regulation accuracy, thus severely limiting the working life of the valve and threatening the stability and safety of the system.

[0004] Therefore, based on the above problems, a control valve for an aircraft bleed air precooler is proposed to solve the problems in the background technology. Summary of the Invention

[0005] To address the problems mentioned in the background art, the present invention provides a control valve for an aircraft bleed air precooler, which solves the problem of adhesive wear and abrasive wear caused by the rigid contact between the valve core and valve body under high-frequency opening and closing conditions when the existing precooler control valve adopts a metal hard seal design and the valve core and valve body are matched with high precision.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a control valve for an aircraft bleed air precooler, comprising a control device and an air guide valve body mounted on the control device, further comprising: a reverse double-threaded screw and a valve core assembly rotatably connected to the air guide valve body, wherein the valve core assembly is mounted on the reverse double-threaded screw, and a set of sealing rings are symmetrically fixedly connected to the air guide valve body, and a drive motor for driving the reverse double-threaded screw to rotate is mounted on the air guide valve body; The valve core assembly includes a sleeve that is symmetrically threaded onto a reverse double-threaded screw. A set of connecting rods are symmetrically hinged to the sleeve, and valve core plates are respectively hinged to the other ends of the two connecting rods. The valve core plate has a portion that overlaps with the rubber gasket on its outward side in the axial direction. The air valve body is equipped with a limiting mechanism to restrict the rotation angle of the sleeve to ninety degrees.

[0007] Preferably, the reverse double-threaded screw is connected to an annular component in the middle, and a set of limiting crossbars are symmetrically fixed to the annular component in the left-right direction, and each set of limiting crossbars is symmetrically fixed to the annular component in the up-down direction. The two ends of the annular component are respectively movably fitted inside two sets of sleeve components.

[0008] Preferably, the limiting mechanism includes a sleeve fixed to the outer periphery of the air valve body. The sleeve has a set of pipe cavities, an arc-shaped cavity one, and an arc-shaped cavity two. The arc of the arc-shaped cavity two is ninety degrees. The pipe cavity is located at one end of the arc-shaped cavity two and communicates with it. The arc-shaped cavity one is located at the tail of the arc-shaped cavity two and the pipe cavity and communicates with both. One end of the sleeve is symmetrically fixed with a set of extension shafts that can slide within the pipe cavity and the arc-shaped cavity. The end of the extension shaft is fixed with a shaft body that can slide within the pipe cavity and the arc-shaped cavity.

[0009] Preferably, a ball bearing is provided at the end of the shaft away from the extension shaft, and the shaft can abut against the cavity of the sleeve through the ball bearing.

[0010] Preferably, a planetary gearbox is installed on the air valve body between the end of the reverse double-threaded screw and the output end of the drive motor. The input end of the planetary gearbox is connected to the output end of the drive motor, and the output end of the planetary gearbox is connected to the end of the reverse double-threaded screw. The planetary gearbox is a reduction gearbox.

[0011] Preferably, the sealing ring has a rubber gasket fixed to the side facing the valve core plate, which can fit against the outer ring portion of the side of the valve core plate.

[0012] Preferably, the limiting mechanism is equipped with a locking mechanism for locking the sleeve.

[0013] Preferably, a positioning groove is provided at the end of the reverse double-threaded screw away from the drive motor, and a spring combination push rod is movably installed thereon; An electromagnet is fixedly installed at one end of the sleeve, and a square locking block is slidably installed in the cavity of the sleeve, with a permanent magnet fixedly connected to the square locking block facing the electromagnet. When the electromagnet is running, it repels the permanent magnet and pushes the square block into the positioning groove. At this time, the side of the square block facing the spring assembly rod abuts against the spring assembly rod and compresses its spring part.

[0014] Preferably, the valve core plate is further provided with a stabilizing component for maintaining the stability of the valve core plate's posture.

[0015] Preferably, the stabilizing component includes a tension spring assembly rod symmetrically and movably mounted on the valve core plate in the vertical direction. The valve core plate is also equipped with a rubber ring sleeved on the outer periphery of the tension spring assembly rod. A connecting rod is hinged to the valve core plate, with one end of the connecting rod hinged to the annular component and the other end abutting against the inner end of the stabilizing component. In the initial state, the tension spring assembly rod is located in the valve core plate under its own elastic force, and when one end of the tension spring assembly rod extends outside the valve core plate, the outer periphery of the tension spring assembly rod can abut against the inner wall of the sealing ring.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows: The above solution uses a drive motor to rotate the reverse double-threaded screw and valve core assembly by 90 degrees, so that the valve core plate rotates to a position perpendicular to the axis of the air guide valve body. The rotation of the reverse double-threaded screw will drive the sleeve to rotate. At this time, the extension shaft and the shaft body will slide in the second arc-shaped cavity and the first arc-shaped cavity, respectively. When the axis of the shaft body coincides with the axis of the pipe cavity, the rotation of this set of sleeves is restricted, and the connecting rod of the other set cannot rotate circumferentially due to the limitation of the ring and the limiting crossbar. At this time, the continued rotation of the reverse double-threaded screw will drive the two sets of sleeves to move towards each other, and push the valve core plate toward the sealing ring and contact it through the connecting rod, thereby achieving a hard seal on the air guide valve body and avoiding wear when the valve core plate seals the air guide valve body. The above solution works by using an electromagnet to generate magnetic force after the valve core plate contacts the sealing ring and seals the air guide valve body. This force repels the electromagnet and pushes the square locking block to overcome the elastic force of the spring combination push rod and lock it into the positioning groove. This locks the reverse double threaded screw and ensures that the valve core plate will not deflect after the valve core assembly seals the air guide valve body.

[0017] The above solution, by causing the connecting rod to rotate and slide on the valve core plate when the two sets of valve core plates move in opposite directions, makes the connecting rod rotate around the axis, and finally causes one end of the connecting rod to squeeze the tension spring combination rod and move outward. When one side of the sleeve comes into contact with the sealing ring and seals, one end of the tension spring combination rod will come into contact with the inner wall of the sealing ring, further realizing the locking of the valve core plate and preventing the valve core plate from deflecting. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the structure of the present invention from a bottom view; Figure 3 This is a top view of the structure of the present invention; Figure 4 This is a schematic diagram of the valve core assembly of the present invention; Figure 5This is a schematic diagram of the valve core plate of the present invention; Figure 6 This is a schematic diagram of the mating structure of the arc-shaped cavity II of the extension shaft of the present invention; Figure 7 This is a partial cross-sectional view of the sleeve component of the present invention; Figure 8 This is a cross-sectional view of the air valve body of the present invention; Figure 9 for Figure 8 Enlarged view of point A in the middle; Figure 10 This is a side cross-sectional view of the air guide valve body of the present invention; Figure 11 for Figure 10 Enlarged view of point B in the middle.

[0019] In the diagram: 1. Controller; 2. Air valve body; 21. Sealing ring; 211. Rubber gasket; 3. Valve core assembly; 31. Sleeve fitting; 311. Extension shaft; 312. Shaft body; 32. Connecting rod; 33. Valve core plate; 4. Drive motor; 41. Planetary gearbox; 5. Reverse double threaded screw; 51. Spring combination push rod; 52. Ring part; 53. Limiting crossbar; 54. Positioning groove; 6. Limiting mechanism; 61. Sleeve fitting; 62. Pipe cavity; 63. Arc-shaped cavity one; 64. Arc-shaped cavity two; 7. Locking mechanism; 71. Electromagnet; 72. Permanent magnet; 73. Square locking block; 8. Stabilizing component; 81. Tension spring combination rod; 82. Rubber ring; 83. Connecting rod. Detailed Implementation

[0020] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. 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.

[0021] like Figures 1 to 11 As shown, the present invention provides a control valve for an aircraft bleed air precooler, including a control device 1 and a bleed air valve body 2 mounted on the control device 1, and further including: a reverse double threaded screw 5 and a valve core assembly 3 rotatably connected to the bleed air valve body 2, the valve core assembly 3 being mounted on the reverse double threaded screw 5, a set of sealing rings 21 being symmetrically fixed inside the bleed air valve body 2, and a drive motor 4 for driving the reverse double threaded screw 5 to rotate being mounted on the bleed air valve body 2; The valve core assembly 3 includes a sleeve 31 that is symmetrically threaded onto a reverse double-threaded screw 5. A set of connecting rods 32 are symmetrically hinged on the sleeve 31. The other ends of the two connecting rods 32 are respectively hinged to valve core plates 33. The valve core plate 33 has an overlapping portion with the rubber gasket 211 on the outward side in the axial direction. The air valve body 2 is equipped with a limiting mechanism 6 for limiting the rotation angle of the sleeve 31 to ninety degrees; A ring-shaped part 52 is connected to the middle of the reverse double threaded screw 5. A set of limiting crossbars 53 are symmetrically fixed to the ring-shaped part 52 in the left-right direction. Each set of limiting crossbars 53 is symmetrically fixed to the ring-shaped part 52 in the up-down direction. The two ends of the ring-shaped part 52 are respectively movably sleeved in two sets of sleeve parts 31. The limiting mechanism 6 includes a sleeve 61 fixed to the outer periphery of the air valve body 2. The sleeve 61 has a set of pipe cavities 62, arc-shaped cavity 1 63 and arc-shaped cavity 2 64. The arc of arc-shaped cavity 2 64 is 90 degrees. Pipe cavity 62 is located at one end of arc-shaped cavity 2 64 and communicates with it. Arc-shaped cavity 1 63 is located at the tail of arc-shaped cavity 2 64 and pipe cavity 62 and communicates with both. A set of extension shafts 311 that can slide in pipe cavity 62 and arc-shaped cavity 2 64 are symmetrically fixed to one end of the sleeve 31. The ends of the extension shafts 311 are fixed to shafts 312 that can slide in pipe cavity 62 and arc-shaped cavity 1 63. The end of the shaft 312 away from the extension shaft 311 is provided with a ball bearing, and the shaft 312 can abut against the cavity of the sleeve 61 through the ball bearing.

[0022] Using the above scheme, the drive motor 4 drives the reverse double threaded screw 5 and the valve core assembly 3 to rotate 90 degrees, so that the valve core plate 33 rotates to a state perpendicular to the axis of the air guide valve body 2. The rotation of the reverse double threaded screw 5 will drive the sleeve 31 to rotate. At this time, the extension shaft 311 and the shaft body 312 will slide in the arc-shaped cavity 64 and the arc-shaped cavity 63 respectively. When the axis of the shaft body 312 coincides with the axis of the pipe cavity 62, the rotation of the sleeve 31 is restricted, and the connecting rod 32 of the other group cannot rotate circumferentially due to the limitation of the ring part 52 and the limiting cross bar 53. At this time, the reverse double threaded screw 5 continues to rotate, which will drive the two sets of sleeve 31 to move towards each other, and push the valve core plate 33 towards the sealing ring 21 and contact it through the connecting rod 32, thereby achieving a hard seal on the air guide valve body 2 and avoiding wear when the valve core plate 33 seals the air guide valve body 2. It is worth noting that when the device needs to be reset, the reverse double-threaded screw 5 is driven to rotate in the reverse direction by the reverse running drive motor 4. At this time, the extension shaft 311 and shaft body 312 on one of the sleeves 31 will move axially along the cavity of the pipe cavity 62. Under the limiting action of the limit crossbar 53, the other sleeve 31 will also be driven to move axially by the reverse double-threaded screw 5. When the shaft body 312 enters the arc-shaped cavity 63 from the pipe cavity 62, the end of the shaft body 312 will abut against the cavity of the sleeve 61. At this time, the rotation of the reverse double-threaded screw 5 cannot drive the sleeve 31 to move axially, but will drive the sleeve 31 to rotate synchronously. Simultaneously, the extension shaft 311 will move along the arc-shaped cavity 64, finally realizing the opening operation of the air valve body 2.

[0023] like Figure 4 and Figure 5 As shown, a planetary gearbox 41 is installed on the air valve body 2 between the end of the reverse double threaded screw 5 and the output end of the drive motor 4. The input end of the planetary gearbox 41 is connected to the output end of the drive motor 4, and the output end of the planetary gearbox 41 is connected to the end of the reverse double threaded screw 5. The planetary gearbox 41 is a reduction gearbox. By adopting the above scheme, the planetary gearbox 41 allows the operator to use a small-volume, high-speed drive motor 4 and amplify the torque through the planetary gearbox 41, thereby making the reverse double-threaded screw 5 more stable when driving the valve core assembly 3 to rotate.

[0024] like Figure 4 As shown, a rubber gasket 211 that can fit against the outer ring portion of the side of the valve core plate 33 is fixed to the side of the sealing ring 21 facing the valve core plate 33. By adopting the above solution, the rubber gasket 211 is set so that the valve core plate 33 abuts against the sealing ring 21 through the rubber gasket 211, which can ensure a tighter contact between the two and avoid air leakage.

[0025] like Figures 1-9 As shown, the limiting mechanism 6 is equipped with a locking mechanism 7 for locking the sleeve 31; the reverse double threaded screw 5 has a positioning groove 54 at the end away from the drive motor 4 and a spring combination push rod 51 is movably installed thereon; An electromagnet 71 is fixedly installed at one end of the sleeve 61, and a square locking block 73 is slidably installed in the cavity of the sleeve 61, and a permanent magnet 72 is fixedly connected to the side of the square locking block 73 facing the electromagnet 71. When the electromagnet 71 is running, it repels the permanent magnet 72 and pushes the square locking block 73 into the positioning groove 54. At this time, the side of the square locking block 73 facing the spring combination push rod 51 abuts against the spring combination push rod 51 and puts its spring part in a compressed state. Using the above scheme, when the valve core plate 33 contacts the sealing ring 21 and seals the air guide valve body 2, the electromagnet 71 is operated to generate magnetic force and repel the permanent magnet 72, thereby pushing the square locking block 73 and overcoming the elastic force of the spring combination push rod 51 and locking it into the positioning groove 54, thereby locking the reverse double threaded screw 5, thus ensuring that the valve core plate 33 will not deflect after the valve core assembly 3 seals the air guide valve body 2; It is worth noting that by disconnecting the power supply to the electromagnet 71, the permanent magnet 72 can attract the electromagnet 71, and at the same time, the elastic force of the spring combination push rod 51 will push the square block 73 out of the positioning groove 54.

[0026] like Figure 1 , Figure 4 , Figure 5 and Figures 8-11 As shown, the valve core plate 33 is also provided with a stabilizing component 8 for maintaining the stability of the valve core plate 33's posture; the stabilizing component 8 includes a tension spring combination rod 81 that is symmetrically and movably installed on the valve core plate 33 in the up-down direction, and a rubber ring 82 that is sleeved on the outer periphery of the tension spring combination rod 81 is also installed on the valve core plate 33. A connecting rod 83 is hinged on the valve core plate 33, one end of the connecting rod 83 is hinged to the annular part 52, and the other end abuts against the inner end of the stabilizing component 8; In the initial state, the tension spring combination rod 81 is located in the valve core plate 33 under its own elastic force, and when one end of the tension spring combination rod 81 extends outside the valve core plate 33, the outer periphery of the tension spring combination rod 81 can abut against the inner wall of the sealing ring 21.

[0027] By adopting the above scheme, when the two sets of valve core plates 33 move in opposite directions, they will also drive the connecting rod 83 to rotate and slide on the valve core plate 33, thereby causing the connecting rod 83 to rotate around the axis. Finally, one end of the connecting rod 83 will squeeze the tension spring combination rod 81 and move outward. When one side of the sleeve 31 contacts and seals the sealing ring 21, one end of the tension spring combination rod 81 will contact the inner wall of the sealing ring 21, further realizing the locking of the valve core plate 33 and preventing the valve core plate 33 from deflecting.

[0028] Working principle and usage process of this invention: When the air-conducting valve body 2 is blocked, the drive motor 4 drives the reverse double-threaded screw 5 and the valve core assembly 3 to rotate 90 degrees, thereby causing the valve core plate 33 to rotate from a state parallel to the axis of the air-conducting valve body 2 to a state perpendicular to the axis of the air-conducting valve body 2. The rotation of the reverse double-threaded screw 5 will drive the sleeve fitting 31 to rotate. At this time, the extension shaft 311 and the shaft body 312 will slide in the arc-shaped cavity 64 and the arc-shaped cavity 63 respectively. When the axis of the shaft body 312 is aligned with the axis of the pipe cavity 62... When the lines coincide, the rotation of the sleeve fitting 31 is restricted, and the connecting rod 32 of the other set cannot rotate circumferentially due to the limitation of the ring part 52 and the limiting cross bar 53. At this time, the reverse double thread screw 5 continues to rotate, which will drive the two sets of sleeve fittings 31 to move towards each other, and push the valve core plate 33 towards the sealing ring 21 and contact it through the connecting rod 32, thereby achieving a hard seal on the air guide valve body 2 and avoiding wear when the valve core plate 33 seals the air guide valve body 2. When the device needs to be reset, the reverse double threaded screw 5 is driven to rotate in the reverse direction by the reverse running drive motor 4. At this time, the extension shaft 311 and shaft body 312 on one of the sleeves 31 will move axially along the cavity of the pipe cavity 62. Under the limiting action of the limit crossbar 53, the other sleeve 31 will also be driven to move axially by the reverse double threaded screw 5. When the shaft body 312 enters the arc-shaped cavity 63 from the pipe cavity 62, the end of the shaft body 312 will abut against the cavity of the sleeve 61. At this time, the rotation of the reverse double threaded screw 5 cannot drive the sleeve 31 to move axially, but will drive the sleeve 31 to rotate synchronously. Simultaneously, the extension shaft 311 will move along the arc-shaped cavity 64, and finally realize the conduction operation of the air valve body 2. When the valve core plate 33 contacts the sealing ring 21 and seals the air guide valve body 2, the electromagnet 71 is activated to generate magnetic force and repel the permanent magnet 72. This pushes the square locking block 73 and overcomes the elastic force of the spring combination push rod 51, locking it into the positioning groove 54. This locks the reverse double threaded screw 5, ensuring that the valve core plate 33 will not deflect after the valve core assembly 3 seals the air guide valve body 2. Furthermore, by disconnecting the power supply to the electromagnet 71, the permanent magnet 72 can attract the electromagnet 71, and the elastic force of the spring combination push rod 51 will push the square locking block 73 out of the positioning groove 54.

[0029] When the two sets of valve core plates 33 move in opposite directions, they will also drive the connecting rod 83 to rotate and slide on the valve core plate 33, thereby causing the connecting rod 83 to rotate around the axis. Finally, one end of the connecting rod 83 will squeeze the tension spring combination rod 81 and move outward. When one side of the sleeve 31 contacts and seals the sealing ring 21, one end of the tension spring combination rod 81 will contact the inner wall of the sealing ring 21, further locking the valve core plate 33 and preventing the valve core plate 33 from deflecting.

[0030] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0031] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A control valve for an aircraft bleed air precooler, comprising a control device (1) and a guide air valve body (2) mounted on the control device (1), characterized in that, Also includes: Rotary connection is made between the reverse double threaded screw (5) and the valve core assembly (3) on the air guide valve body (2). The valve core assembly (3) is installed on the reverse double threaded screw (5). A set of sealing rings (21) are also symmetrically fixed inside the air guide valve body (2). A drive motor (4) for driving the reverse double threaded screw (5) to rotate is installed on the air guide valve body (2). The valve core assembly (3) includes a sleeve (31) that is symmetrically threaded onto a reverse double-threaded screw (5). A set of connecting rods (32) are symmetrically hinged on the sleeve (31), and the other ends of the two connecting rods (32) are respectively hinged to valve core plates (33). The valve core plate (33) has an overlapping portion with the rubber gasket (211) on its outward side in the axial direction. The air valve body (2) is equipped with a limiting mechanism (6) for limiting the rotation angle of the sleeve (31) to ninety degrees.

2. The control valve for the precooler of aircraft bleed air according to claim 1, characterized in that: The reverse double threaded screw (5) is connected to a ring (52) in the middle. A set of limiting crossbars (53) are symmetrically fixed on the ring (52) in the left-right direction. Each set of limiting crossbars (53) is symmetrically fixed on the ring (52) in the up-down direction. The two ends of the annular component (52) are respectively movably sleeved in two sets of sleeve components (31).

3. The control valve for the precooler of aircraft bleed air according to claim 2, characterized in that: The limiting mechanism (6) includes a sleeve (61) fixed to the outer periphery of the air valve body (2). The sleeve (61) has a set of pipe cavity (62), arc cavity one (63) and arc cavity two (64). The arc of arc cavity two (64) is ninety degrees. The pipe cavity (62) is located at one end of arc cavity two (64) and communicates with it. The arc cavity one (63) is located at the tail of arc cavity two (64) and pipe cavity (62) and communicates with both. One end of the sleeve (31) is symmetrically fixed with a set of extension shafts (311) that can slide within the pipe cavity (62) and the arc-shaped cavity (64). The end of the extension shaft (311) is fixed with a shaft (312) that can slide within the pipe cavity (62) and the arc-shaped cavity (63).

4. The control valve for the precooler of aircraft bleed air according to claim 3, characterized in that: The shaft (312) is provided with a ball bearing at one end away from the extension shaft (311), and the shaft (312) can abut against the cavity of the sleeve (61) through the ball bearing.

5. The control valve for the precooler of aircraft bleed air according to claim 1, characterized in that: The air valve body (2) is equipped with a planetary gearbox (41) located between the end of the reverse double threaded screw (5) and the output end of the drive motor (4). The input end of the planetary gearbox (41) is connected to the output end of the drive motor (4), and the output end of the planetary gearbox (41) is connected to the end of the reverse double threaded screw (5). The planetary gearbox (41) is a reduction gearbox.

6. The control valve for the precooler of aircraft bleed air according to claim 1, characterized in that: The sealing ring (21) has a rubber gasket (211) fixed to the side facing the valve core plate (33) that can fit against the outer ring portion of the side of the valve core plate (33).

7. The control valve for the precooler of aircraft bleed air according to claim 3, characterized in that: The limiting mechanism (6) is equipped with a locking mechanism (7) for locking the sleeve (31).

8. The control valve for the precooler of aircraft bleed air according to claim 7, characterized in that: The reverse double threaded screw (5) has a positioning groove (54) at one end away from the drive motor (4) and a spring combination push rod (51) is movably installed thereon. An electromagnet (71) is fixedly installed at one end of the sleeve (61), and a square locking block (73) is slidably installed in the cavity of the sleeve (61), and a permanent magnet (72) is fixedly connected to the square locking block (73) facing the electromagnet (71). When the electromagnet (71) is running, it repels the permanent magnet (72) and pushes the square block (73) into the positioning groove (54). At this time, the square block (73) abuts against the spring assembly rod (51) on the side facing the spring assembly rod (51) and compresses its spring part.

9. The control valve for the precooler of aircraft bleed air according to claim 2, characterized in that: The valve core plate (33) is also provided with a stabilizing component (8) for maintaining the stability of the valve core plate (33).

10. The control valve for the precooler of aircraft bleed air according to claim 9, characterized in that: The stabilizing component (8) includes a tension spring assembly rod (81) symmetrically and movably mounted on the valve core plate (33) in the vertical direction. A rubber ring (82) is also mounted on the valve core plate (33) and sleeved on the outer periphery of the tension spring assembly rod (81). A connecting rod (83) is hinged on the valve core plate (33). One end of the connecting rod (83) is hinged to the annular part (52), and the other end abuts against the inner end of the stabilizing component (8). In the initial state, the tension spring combination rod (81) is in the valve core plate (33) under its own elastic force, and when one end of the tension spring combination rod (81) extends to the outside of the valve core plate (33), the outer periphery of the tension spring combination rod (81) can abut against the inner wall of the sealing ring (21).

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