An optimized structure of mechanical plugging cover for air intake

Abstract

The present invention discloses an optimized structure of a mechanical plugging cover for an air inlet, comprising a base, a plugging cover and an pyrotechnic actuator, wherein the base is provided with an opening that can be blocked by the plugging cover when the engine is shifted; the plugging cover is connected to the pyrotechnic actuator through a transmission structure, so that when the engine is shifted, the plugging cover is driven to move by the pyrotechnic actuator to block the opening on the base; when the plugging cover blocks the opening on the base, an anti-rebound structure is provided between the plugging cover and the base. The mechanical plugging cover structure is optimized, and the function of the mechanical plugging cover is maintained unchanged, thereby solving the problem of the plugging cover rebounding during the shifting process, so that the solid fuel engine can be shifted reliably and smoothly, and the cost is low, and the structure is simple and reliable.

Description

Technical Field

[0001] The invention relates to the technical field of air intake duct plugging cover structures, and in particular to an air intake duct mechanical plugging cover optimization structure. Background Art

[0002] With the development of aircraft technology and the increasing requirements for engines, ramjet engines have become the development direction of high Mach number aircraft due to their simple structure, small size, high specific impulse and low cost. For solid rocket ramjet combination engines, stage transfer is required to realize the engine conversion process.

[0003] The structural design of the air intake plug for the current solid-fuel engine is relatively mature. Both the mechanical plug and the disposable plug can meet the needs of the stage change. However, the ejected objects of the disposable plug are easy to damage the engine casing, so the mechanical plug is generally used as the opening method of the plug. The mechanical plug is generally equipped with a pyrotechnic actuator to drive the plug to move through a hinge mechanism. This structural method will cause the plug to rebound after moving to the designed position due to the large impact generated by the pyrotechnic actuator during operation, resulting in the final position of the plug being offset from the designed position, thereby affecting the performance of the entire air intake. In severe cases, it will also cause the engine stage change to fail. Summary of the invention

[0004] In view of the shortcomings of the prior art mentioned above, the present invention provides an optimized structure of an inlet mechanical plugging cover, optimizes the mechanical plugging cover structure, and solves the problem of plugging cover rebound during the stage shifting process while keeping the function of the mechanical plugging cover unchanged. The stage shifting of the solid-fuel engine can be carried out reliably and smoothly, and the cost is low, the structure is simple and reliable.

[0005] To achieve the above-mentioned purpose, the present invention provides an optimized structure of an air intake mechanical plugging cover, comprising a base, a plugging cover and an pyrotechnic actuator, wherein the base is provided with an opening that can be blocked by the plugging cover when the engine is shifted;

[0006] The blocking cover is connected to the pyrotechnic actuator via a transmission structure, so that when the engine is shifted, the blocking cover is driven by the pyrotechnic actuator to move, thereby blocking the opening on the base;

[0007] When the blocking cover blocks the opening on the base, an anti-rebound structure is provided between the blocking cover and the base.

[0008] As a further improvement of the above technical solution, one end of the blocking cover is rotatably connected to a position on the base on one side of the opening via a first rotating shaft, and the anti-rebound structure is arranged on a position on the base on the other side of the opening.

[0009] As a further improvement of the above technical solution, the anti-rebound structure is a snap-on structure, including a first snap-on portion and a second snap-on portion that cooperate with each other, the first snap-on portion is arranged on one of the blocking cover and the base, and the second snap-on portion is arranged on the other of the blocking cover and the base.

[0010] As a further improvement of the above technical solution, the first buckle portion is a buckle opening, and the second buckle portion is an umbrella-shaped structure, including an umbrella shaft portion and an umbrella petal portion connected to the umbrella shaft portion;

[0011] The diameter of the umbrella shaft portion is smaller than the caliber of the buckle opening, and the maximum diameter of the umbrella petal portion is larger than the caliber of the buckle opening.

[0012] As a further improvement of the above technical solution, the buckle opening is a V-shaped chamfered opening.

[0013] As a further improvement of the above technical solution, one end of the umbrella shaft is threadedly connected to the base or the cover, and the umbrella petal portion is arranged at the other end of the umbrella shaft.

[0014] As a further improvement of the above technical solution, the threaded connection between the umbrella shaft and the base or the cover is locked by a locking wire screw sleeve.

[0015] As a further improvement of the above technical solution, the pyrotechnic actuator is provided with a piston rod capable of performing linear motion when the engine is turned over;

[0016] The transmission structure includes a second rotating shaft, a connecting rod and a third rotating shaft. One end of the connecting rod is rotatably connected to the plug cover through the second rotating shaft, and the other end of the connecting rod is rotatably connected to the piston rod through the third rotating shaft.

[0017] As a further improvement of the above technical solution, a slide groove cooperating with the third rotating shaft is provided on the base, the length direction of the slide groove is the same as the movement direction of the piston rod, and the third rotating shaft is slidably connected in the slide groove.

[0018] Compared with the prior art, the present invention has the following beneficial technologies:

[0019] (1) The present invention avoids the phenomenon that the mechanical plugging cover of the air inlet duct rebounds during operation.

[0020] (2) The preferred embodiment of the present invention avoids radial force during the opening process of the plugging cover, thereby reducing the risk of the mechanical plugging cover of the air inlet duct getting stuck during operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0022] Figure 1 It is a schematic diagram of the structure of the optimized structure of the air inlet mechanical plugging cover before the plugging base in the embodiment of the present invention;

[0023] Figure 2 It is a schematic diagram of the structure of the optimized structure of the air inlet mechanical plugging cover after the plugging cover blocks the base in the embodiment of the present invention;

[0024] Figure 3 It is a top view of the optimized structure of the mechanical plugging cover of the air inlet in an embodiment of the present invention.

[0025] Description of the accompanying drawings: base 1, plug cover 2, pyrotechnic device actuator 3, opening 11, piston rod 31, first rotating shaft 4, first buckle portion 51, second buckle portion 52, second rotating shaft 61, connecting rod 62, third rotating shaft 63, slide groove 7.

[0026] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0028] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0029] In addition, in the present invention, descriptions such as "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0030] In the present invention, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, a physical connection, or a wireless communication connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0031] In addition, the technical solutions between the various embodiments of the present invention can be combined with each other, but it must be based on the fact that ordinary technicians in the field can implement it. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0032] like Figure 1-3 The figure shows an optimized structure of an air intake mechanical plugging cover disclosed in this embodiment, which includes a base 1, a plugging cover 2 and an pyrotechnic actuator 3, wherein the base 1 is a hollow structure, and an opening 11 is provided on the base 1 that can be blocked by the plugging cover 2 when the engine is shifted, and the opening 11 is connected to the hollow cavity of the base 1. The pyrotechnic actuator 3 is provided with a piston rod 31 that can make a linear motion when the engine is shifted, and the plugging cover 2 is connected to the pyrotechnic actuator 3 through a transmission structure, so that when the engine is shifted, the piston rod 31 on the pyrotechnic actuator 3 drives the plugging cover 2 to move, thereby blocking the opening 11 on the base 1, and at the same time, when the plugging cover 2 blocks the opening 11 on the base 1, an anti-rebound structure is provided between the plugging cover 2 and the base 1. This embodiment optimizes the mechanical plugging cover structure, and solves the problem of plugging cover rebound during the shifting process while keeping the function of the mechanical plugging cover unchanged, so that the solid-fuel engine can be shifted reliably and smoothly.

[0033] In this embodiment, one end of the plug cover 2 is rotatably connected to a position on one side of the opening 11 on the base 1 through the first rotating shaft 4, so that a hinge is formed between the plug cover 2 and the base 1. The plug cover 2 rotates around the first rotating shaft 4 under the drive of the piston rod 31 on the pyrotechnic actuator 3, and finally blocks the opening 11 on the base 1, and the anti-rebound structure is arranged on the base 1 at the other side of the opening 11. Among them, the anti-rebound structure is a buckle structure that can be locked when the plug cover 2 blocks the opening 11 on the base 1, and the buckle structure includes a first buckle part 51 and a second buckle part 52 that cooperate with each other, the first buckle part 51 is arranged on one of the plug cover 2 and the base 1, and the second buckle part 52 is arranged on the other of the plug cover 2 and the base 1.

[0034] In this embodiment, the first buckle part 51 is arranged on the base 1, and the second buckle part 52 is arranged on the plug cover 2. The first buckle part 51 is a buckle opening arranged on the base 1 and connected to the hollow cavity of the base 1, and the second buckle part 52 is an umbrella-shaped structure, which includes an umbrella shaft part and an umbrella petal part connected to the umbrella shaft part, wherein the umbrella shaft part is the umbrella shaft of the umbrella structure, and the umbrella petal part is the umbrella rib of the umbrella structure, wherein the umbrella shaft part is a metal rod, and the umbrella petal part is a plurality of metal rods with elasticity; one end of the umbrella shaft part is threadedly connected to the base 1 or the cover, and the umbrella petal part is arranged at the other end of the umbrella shaft part, wherein preferably, the threaded connection between the umbrella shaft part and the base 1 or the cover is locked by a locking wire screw sleeve.

[0035] It should be noted that the diameter of the umbrella rod is smaller than the caliber of the buckle opening, and the maximum diameter of the umbrella petal is larger than the caliber of the buckle opening. When the plugging cover 2 gradually blocks the opening 11 on the base 1, the umbrella petal gradually enters the buckle opening, and under the action of the elastic force, the maximum diameter of the umbrella petal gradually decreases, and when the plugging cover 2 completely blocks the opening 11 on the base 1, the umbrella petal completely passes through the buckle opening and returns to its original state, so that the first buckle part 51 and the second buckle part 52 cannot be separated, thereby avoiding the rebound of the plugging cover 2. Preferably, the buckle opening is a V-shaped chamfered opening 11, that is, the inclination direction of the inner wall of the buckle opening is the same as the inclination direction of the umbrella petal, thereby effectively reducing the friction resistance between the umbrella petal and the buckle when the umbrella petal gradually enters the buckle, reducing the wear of the umbrella petal.

[0036] It should be noted that the anti-rebound structure in this embodiment is not limited to the snap-on structure of the above-mentioned structural form, but may also be a connecting structure of other structural forms, such as snap-on protrusions and snap-on grooves, etc., which will not be elaborated in this embodiment.

[0037] In this embodiment, the transmission structure adopts a connecting rod structure, which specifically includes a second rotating shaft 61, a connecting rod 62 and a third rotating shaft 63. One end of the connecting rod 62 is rotatably connected to the plug cover 2 through the second rotating shaft 61 to form a hinge, and the other end of the connecting rod 62 is rotatably connected to the piston rod 31 through the third rotating shaft 63 to form a hinge. At the same time, the slide groove seat threadedly connected to the base 1 is provided with a slide groove 7 that cooperates with the third rotating shaft 63. The slide groove 7 is a U-shaped groove. The slide groove seat is positioned by a boss so that the length direction of the slide groove 7 is the same as the movement direction of the piston rod 31, and the third rotating shaft 63 is slidably connected in the slide groove 7. When the pyrotechnic actuator 3 is working, the radial force generated by the hinge mechanism is limited by the slide groove 7 to avoid the risk of getting stuck during movement.

[0038] The above description is only a preferred embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the inventive concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. An optimized structure for mechanical plugging of an air inlet, characterized in that: It includes a base, a plug cover and an pyrotechnic actuator, wherein the base is provided with an opening which can be blocked by the plug cover when the engine is shifted; The blocking cover is connected to the pyrotechnic actuator via a transmission structure, so that when the engine is shifted, the blocking cover is driven by the pyrotechnic actuator to move, thereby blocking the opening on the base; When the blocking cover blocks the opening on the base, an anti-rebound structure is provided between the blocking cover and the base; The pyrotechnic actuator is provided with a piston rod capable of linear motion when the engine is turned; the transmission structure comprises a second rotating shaft, a connecting rod and a third rotating shaft, one end of the connecting rod is rotatably connected to the plug cover via the second rotating shaft, and the other end of the connecting rod is rotatably connected to the piston rod via the third rotating shaft; A slide slot seat is connected to the base, and a slide slot matching the third rotating shaft is provided on the slide slot seat; the slide slot seat is positioned by a boss so that the length direction of the slide slot is the same as the movement direction of the piston rod, and the third rotating shaft is slidably connected in the slide slot; when the pyrotechnic actuator is working, the radial force generated by the hinge mechanism is limited by the slide slot.

2. According to claim 1, the optimized structure of the air intake mechanical plugging cover is characterized in that: One end of the blocking cover is rotatably connected to a position on the base located on one side of the opening via a first rotating shaft, and the anti-rebound structure is arranged on a position on the base located on the other side of the opening.

3. The optimized structure of mechanical air intake plugging according to claim 2 is characterized in that: The anti-rebound structure is a snap-on structure, including a first snap-on portion and a second snap-on portion that cooperate with each other, wherein the first snap-on portion is arranged on one of the blocking cover and the base, and the second snap-on portion is arranged on the other of the blocking cover and the base.

4. The optimized structure for mechanical air intake blocking according to claim 3 is characterized in that: The first buckle portion is a buckle opening, and the second buckle portion is an umbrella-shaped structure, including an umbrella shaft portion and an umbrella petal portion connected to the umbrella shaft portion; The diameter of the umbrella shaft portion is smaller than the caliber of the buckle opening, and the maximum diameter of the umbrella petal portion is larger than the caliber of the buckle opening.

5. The optimized structure for mechanical air intake blocking according to claim 4 is characterized in that: The buckle opening is a V-shaped chamfered opening.

6. The optimized structure for mechanical air intake blocking according to claim 4 is characterized in that: One end of the umbrella shaft is threadedly connected to the base or the cover, and the umbrella petal is arranged at the other end of the umbrella shaft.

7. The optimized structure for mechanical air intake blocking according to claim 6 is characterized in that: The threaded connection between the umbrella rod and the base or the cover is locked by a locking wire screw sleeve.

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