A nozzle structure

Abstract

The application discloses a tail nozzle structure and relates to the technical field of tail nozzles. The outer section of the nozzle converging section comprises a plurality of sliding plates, the sliding plates are slidably connected with sliding grooves of the inner section of the nozzle converging section, one end of the outer section of the nozzle converging section is a tail nozzle outlet, the other end of the outer section of the nozzle converging section is connected with a terminal ring, one end of each positioning rod is connected with the terminal ring, each positioning rod is slidably connected with a fixing ring, the other end of each positioning rod can pass through the fixing ring and a locking ring, the locking ring can lock the positioning rod, an extension structure is arranged on the outer side of each positioning rod, the extension structure comprises a spring assembly, the extension structure is located between the terminal ring and the fixing ring, the extension structure drives the terminal ring and the positioning rod to move through extension and contraction, and thus the size of the tail nozzle outlet is adjusted. The spring assembly is adopted as the extension structure, the size of the tail nozzle outlet is changed through the extension and contraction of the spring assembly, and the purpose of reducing the overall structural weight is achieved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of tail nozzles, in particular to a tail nozzle structure. BACKGROUND

[0002] The function of the tail nozzle of an aero-engine is mainly to make the gas after the turbine continue to expand in the tail nozzle, convert the remaining heat energy in the gas into kinetic energy, and make it be sprayed out of the nozzle at a high speed to provide thrust for the engine. In order to make the engine have good performance under different working conditions, the outlet area of the tail nozzle can be adjusted to make the gas after the turbine fully expand under different working conditions, thereby reducing the thrust loss of the engine.

[0003] The commonly used tail nozzle structure with adjustable outlet area uses a motor to drive or hydraulic drive the adjustable part of the tail nozzle to rotate around the front end support point to change the position of the rear end point, thereby changing the outlet area of the tail nozzle. The above-mentioned schemes all have the disadvantage of heavy overall structure quality. SUMMARY

[0004] The purpose of the present application is to provide a tail nozzle structure, which solves the problem of heavy overall structure quality in the traditional motor driving or hydraulic driving adjustment method.

[0005] To achieve the above-mentioned purpose, the present application provides the following scheme:

[0006] The present application provides a tail nozzle structure, which comprises a nozzle body, a tail ring, a fixed ring, a locking ring and a plurality of positioning rods, the nozzle body comprises a nozzle converging section, the nozzle converging section comprises an outer section of the nozzle converging section and an inner section of the nozzle converging section, the outer section of the nozzle converging section is located outside the inner section of the nozzle converging section, the outer section of the nozzle converging section comprises a plurality of sliding plates, the overlapping parts of adjacent sliding plates are sequentially arranged in overlapping manner, the sliding plates are slidably connected with the sliding grooves of the inner section of the nozzle converging section, one end of the outer section of the nozzle converging section is a tail nozzle outlet, the other end of the outer section of the nozzle converging section is connected with the tail ring, one end of each positioning rod is connected with the tail ring, each positioning rod is slidably connected with the fixed ring, and the other end of each positioning rod can pass through the fixed ring and the locking ring, the locking ring can lock the positioning rods, an extension structure is arranged on the outer side of each positioning rod, the extension structure comprises a spring assembly, the extension structure is located between the tail ring and the fixed ring, the extension structure drives the tail ring and the positioning rods to move, thereby adjusting the size of the tail nozzle outlet.

[0007] Preferably, the other end of the outer section of the nozzle converging section is connected with the tail ring through a plurality of push rods, one end of each push rod is hingedly connected with one sliding plate, and the other end of each push rod is hingedly connected with the tail ring.

[0008] Preferably, at least one moving ring is arranged between the terminal ring and the fixed ring, the moving ring is in sliding connection with the positioning rod, the telescopic structure is arranged between the terminal ring and the moving ring, between adjacent moving rings and between the moving ring and the fixed ring, two ends of the telescopic structure between the terminal ring and the moving ring are connected with the terminal ring and the moving ring respectively, two ends of the telescopic structure between adjacent moving rings are connected with adjacent moving rings respectively, and two ends of the telescopic structure between the moving ring and the fixed ring are connected with the moving ring and the fixed ring respectively.

[0009] Preferably, the spring assembly is an sma spring.

[0010] Preferably, the telescopic structure further comprises a common spring, and the common spring is located on the inner side or the outer side of the sma spring.

[0011] Preferably, the spring assembly is made of an electrostrictive material.

[0012] Preferably, a limiting structure is arranged on the inner side or the outer side of the telescopic structure, the limiting structure is a telescopic sleeve, two ends of the telescopic sleeve between the terminal ring and the moving ring are connected with the terminal ring and the moving ring respectively, two ends of the telescopic sleeve between adjacent moving rings are connected with adjacent moving rings respectively, and two ends of the telescopic sleeve between the moving ring and the fixed ring are connected with the moving ring and the fixed ring respectively.

[0013] Preferably, the locking ring and the fixed ring can rotate relative to each other, a plurality of sliding holes are formed in the locking ring, each positioning rod comprises a rod body and a plurality of positioning structures, the plurality of positioning structures are arranged along the axial direction of the rod body, a gap is arranged between adjacent positioning structures, one end of the sliding hole is larger than the size of the positioning structure, and the other end of the sliding hole is larger than the size of the rod body and smaller than the size of the positioning structure; when the outlet size of the tail nozzle is adjusted, the positioning rod slides at one end of the sliding hole, after the outlet size of the tail nozzle is adjusted to the right position, the locking ring is rotated, so that the rod body between adjacent positioning structures is located at the other end of the sliding hole, and the locking of the positioning rod is realized.

[0014] Preferably, each positioning structure comprises a plurality of positioning plates, and each positioning plate is arranged in the circumferential direction of the rod body.

[0015] Preferably, the sliding plate is a sliding plate or a straight plate.

[0016] The present application has the following technical effects relative to the prior art:

[0017] The application adopts a spring assembly as the telescopic structure, changes the size of the tail nozzle outlet through the telescopic spring assembly, and achieves the purpose of reducing the overall structure mass. BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments will be briefly introduced. Obviously, the drawings in the following description only constitute some embodiments of the present application, and other drawings can be obtained by those skilled in the art without any creative effort on the basis of these drawings.

[0019] Figure 1 The tail nozzle structure isometric view of the present application (the area of the tail nozzle outlet is minimum and the nozzle converging section inner section is omitted);

[0020] Figure 2 The tail nozzle structure front view of the present application;

[0021] Figure 3 The sliding plate schematic of the present application Figure 1 ;

[0022] Figure 4 The sliding plate schematic of the present application Figure 2 ;

[0023] Figure 5 The end ring, limiting structure, moving ring and positioning rod position relationship schematic of the present application;

[0024] Figure 6 The spring assembly exploded view schematic of the present application;

[0025] Figure 7 The locking ring and positioning rod schematic of the present application when the locking ring is not locked;

[0026] Figure 8 The partial enlarged view of Figure 7 ;

[0027] Figure 9 The locking ring and positioning rod schematic of the present application when the locking ring is locked;

[0028] Figure 10 The partial enlarged view of Figure 9 ;

[0029] Wherein: 100-tail nozzle structure, 1-nozzle converging section outer section, 2-sliding plate, 3-pushing rod, 4-positioning rod, 5-end ring, 6-moving ring, 7-fixed ring, 8-locking ring, 9-telescopic structure, 10-ordinary spring, 11-limiting structure, 12-sliding hole, 13-spring assembly, 14-rod body, 15-positioning plate. DETAILED DESCRIPTION

[0030] 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.

[0031] The purpose of this invention is to provide a tail nozzle structure that solves the problem of heavy overall structural mass in traditional motor-driven or hydraulically driven adjustment methods.

[0032] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0033] like Figures 1 to 10 As shown: This embodiment provides a tail nozzle structure 100, including a nozzle body, an end ring 5, a fixing ring 7, a locking ring 8, and several positioning rods 4. The nozzle body includes a nozzle converging section, which includes an outer section 1 and an inner section. The outer section 1 is located outside the inner section. The outer section 1 includes several sliding plates 2, with the overlapping portions of adjacent sliding plates 2 stacked sequentially, i.e., adjacent sliding plates 2 are stacked in a fish-scale pattern. The sliding plates 2 are slidably connected to the grooves of the inner section of the nozzle converging section to form a sliding pair. The sliding plates 2 are either sliding plates or straight plates, and the corresponding grooves are curved grooves or straight grooves. The shape of the sliding plates 2 matches the grooves. One end of section 1 is the nozzle outlet. The other end of the outer section 1 of the nozzle converging section is connected to the end ring 5 through several push rods 3. One end of each push rod 3 is hinged to a sliding plate 2, and the other end of each push rod 3 is hinged to the end ring 5. One end of each positioning rod 4 is connected to the end ring 5, and each positioning rod 4 is slidably connected to the fixed ring 7. The other end of each positioning rod 4 can pass through the fixed ring 7 and the locking ring 8. The locking ring 8 is located outside the fixed ring 7 and can lock the positioning rod 4. A telescopic structure 9 is sleeved on the outside of each positioning rod 4. The telescopic structure 9 is located between the end ring 5 and the fixed ring 7. The telescopic structure 9 extends and retracts, driving the end ring 5 and the positioning rod 4 to move, thereby realizing the adjustment of the nozzle outlet size.

[0034] Specifically, in the embodiment, at least one moving ring 6 is arranged between the terminal ring 5 and the fixed ring 7, the moving ring 6 is in sliding connection with the positioning rod 4, the positioning rod 4 realizes axial positioning between the terminal ring 5, the moving ring 6 and the fixed ring 7, and an expansion structure 9 is arranged between the terminal ring 5 and the moving ring 6, between adjacent moving rings 6 and between the moving ring 6 and the fixed ring 7, both ends of the expansion structure 9 between the terminal ring 5 and the moving ring 6 are connected with the terminal ring 5 and the moving ring 6 respectively, both ends of the expansion structure 9 between adjacent moving rings 6 are connected with the adjacent moving rings 6 respectively, and both ends of the expansion structure 9 between the moving ring 6 and the fixed ring 7 are connected with the moving ring 6 and the fixed ring 7 respectively.

[0035] In the embodiment, the terminal ring 5, the moving ring 6, the fixed ring 7 and the locking ring 8 are coaxially arranged.

[0036] In the embodiment, the expansion structure 9 includes a spring assembly 13 and a common spring 10, the common spring 10 is located on the inner side or the outer side of the spring assembly 13, and the common spring 10 provides a restoring force for the spring assembly 13. The spring assembly 13 is an sma spring (the full name of sma is shape memory alloy), or the spring assembly 13 is made of an electrostrictive material.

[0037] In the embodiment, a limiting structure 11 is arranged on the inner side or the outer side of the expansion structure 9, the limiting structure 11 is an expansion sleeve, both ends of the expansion sleeve between the terminal ring 5 and the moving ring 6 are connected with the terminal ring 5 and the moving ring 6 respectively, both ends of the expansion sleeve between adjacent moving rings 6 are connected with the adjacent moving rings 6 respectively, and both ends of the expansion sleeve between the moving ring 6 and the fixed ring 7 are connected with the moving ring 6 and the fixed ring 7 respectively. When the expansion sleeve is contracted to the shortest, the expansion sleeve plays a limiting role.

[0038] In the embodiment, the original length of the sma spring and the common spring 10 under no force is the same as the maximum elongation length of the expansion sleeve at the corresponding position.

[0039] In the embodiment, the locking ring 8 and the fixed ring 7 can rotate relative to each other, the locking ring 8 is provided with a plurality of sliding holes 12, each positioning rod 4 comprises a rod body 14 and a plurality of positioning structures, the positioning structures are arranged along the axial direction of the rod body 14, and gaps are arranged between adjacent positioning structures, each sliding hole 12 corresponds to the positioning structure of each positioning rod 4 in one-to-one correspondence, each positioning structure preferably comprises four positioning plates 15, the four positioning plates 15 are arranged in a cross shape along the circumferential direction of the rod body 14, one end of the sliding hole 12 is larger than the size of the positioning structure, and the other end of the sliding hole 12 is larger than the size of the rod body 14 and smaller than the size of the positioning structure; when the outlet size of the tail nozzle is adjusted, the positioning rod 4 slides at one end of the sliding hole 12, and after the outlet size of the tail nozzle is adjusted to the right position, the locking ring 8 is rotated, so that the rod body 14 between adjacent positioning structures is located at the other end of the sliding hole 12, the locking of the positioning rod 4 is realized, and the axial movement of the positioning rod 4 is limited.

[0040] When each sma spring is heated, the sliding plate 2 moves outward in the sliding groove (away from the fixed ring 7), and when the push rod 3 is guided to the first limit position, the length of the convergent section of the nozzle is maximum, and the area of the tail nozzle outlet is minimum; when the push rod 3 is guided to the first limit position, each telescopic structure 9 is in the original length state, the telescopic sleeve is elongated to the maximum, the distance between the terminal ring 5 and the adjacent moving ring 6 is the length of the sma spring between the terminal ring 5 and the adjacent moving ring 6 (that is, the maximum elongation length of the telescopic sleeve between the terminal ring 5 and the adjacent moving ring 6), the distance between the adjacent moving rings 6 is the length of the sma spring between the adjacent moving rings 6 (that is, the maximum elongation length of the telescopic sleeve between the adjacent moving rings 6), and the distance between the fixed ring 7 and the adjacent moving ring 6 is the length of the sma spring between the fixed ring 7 and the adjacent moving ring 6 (that is, the maximum elongation length of the telescopic sleeve between the fixed ring 7 and the adjacent moving ring 6);

[0041] When each sma spring is cooled, the sliding plate 2 moves inward in the sliding groove (towards the fixed ring 7), and when the push rod 3 is guided to the second limit position, the length of the convergent section of the nozzle is minimum, and the area of the tail nozzle outlet is maximum; when the push rod 3 is guided to the second limit position, each telescopic structure 9 is in the contracted state, the telescopic sleeve is contracted to the shortest, the distance between the terminal ring 5 and the adjacent moving ring 6 is the length of the sma spring between the terminal ring 5 and the adjacent moving ring 6 after contraction (that is, the minimum contraction length of the telescopic sleeve between the terminal ring 5 and the adjacent moving ring 6), the distance between the adjacent moving rings 6 is the length of the sma spring between the adjacent moving rings 6 after contraction (that is, the minimum contraction length of the telescopic sleeve between the adjacent moving rings 6), and the distance between the fixed ring 7 and the adjacent moving ring 6 is the length of the sma spring between the fixed ring 7 and the adjacent moving ring 6 after contraction (that is, the minimum contraction length of the telescopic sleeve between the fixed ring 7 and the adjacent moving ring 6).

[0042] The embodiment adopts the combination of the sma spring and the common spring 10 as the driving source, uses the multiple telescopic structures 9 and multiple telescopic sleeves arranged on the connecting rod to realize the multi-gear adjustment of the tail nozzle outlet area, realizes the segmented control, makes the control more accurate, makes the tail nozzle structure 100 have different working states; the outer section 1 of the nozzle converging section is arranged as a plurality of sliding plates 2 with certain longitudinal curvature, realizes the nonlinear change of the tail nozzle outlet area with the axial movement distance of the nozzle converging section outer section 1, improves the driving efficiency; the design of the extended tail nozzle outlet area adjustment mode makes the nozzle converging section outer section 1 slide in the sliding groove, compared with the space used by the adjustment mode of the adjustable part rotating around the front end support point, the space is smaller, effectively improves the space utilization; the sliding groove on the inner section of the nozzle converging section improves the reliability of the working state of the nozzle converging section outer section 1; the shape memory alloy has the advantages of high specific strength and good corrosion resistance, using its shape memory effect, it can realize high power output, compared with the traditional motor drive or hydraulic drive, using sma spring drive can reduce the weight of the overall structure, can realize intelligent control.

[0043] The principles and implementation modes of the present application are described in the specification by applying specific examples, and the above examples are only used to help understand the method of the present application and its core idea; at the same time, for those skilled in the art, according to the idea of the present application, the specific implementation mode and application range will be changed. In view of the above, the content of the specification should not be understood as a limitation of the present application.

Claims

1. A tail nozzle structure, characterized in that: The system includes a nozzle body, an end ring, a fixing ring, a locking ring, and several positioning rods. The nozzle body includes a nozzle converging section, which comprises an outer converging section and an inner converging section. The outer converging section is located outside the inner converging section. The outer converging section includes several sliding plates, with overlapping portions of adjacent sliding plates sequentially arranged. The sliding plates are slidably connected to a groove in the inner converging section. One end of the outer converging section is the tail nozzle outlet, and the other end is connected to... The end ring is connected, one end of each positioning rod is connected to the end ring, each positioning rod is slidably connected to the fixed ring, and the other end of each positioning rod can pass through the fixed ring and the locking ring. The locking ring can lock the positioning rod. A telescopic structure is sleeved on the outside of each positioning rod. The telescopic structure includes a spring assembly. The telescopic structure is located between the end ring and the fixed ring. The telescopic structure extends and retracts, driving the end ring and the positioning rod to move, thereby realizing the adjustment of the tail nozzle outlet size.

2. The tail nozzle structure according to claim 1, characterized in that: The other end of the outer section of the nozzle convergence section is connected to the end ring through several push rods. One end of each push rod is hinged to a sliding plate, and the other end of each push rod is hinged to the end ring.

3. The tail nozzle structure according to claim 1, characterized in that: At least one movable ring is provided between the end ring and the fixed ring. The movable ring is slidably connected to the positioning rod. The telescopic structure is provided between the end ring and the movable ring, between adjacent movable rings, and between the movable ring and the fixed ring. The two ends of the telescopic structure between the end ring and the movable ring are respectively connected to the end ring and the movable ring. The two ends of the telescopic structure between adjacent movable rings are respectively connected to the adjacent movable ring. The two ends of the telescopic structure between the movable ring and the fixed ring are respectively connected to the movable ring and the fixed ring.

4. The tail nozzle structure according to claim 1, characterized in that: The spring assembly is an SMA spring.

5. The tail nozzle structure according to claim 4, characterized in that: The telescopic structure also includes a conventional spring, which is located inside or outside the SMA spring.

6. The tail nozzle structure according to claim 1, characterized in that: The spring assembly is made of an electrostrictive material.

7. The tail nozzle structure according to claim 3, characterized in that: The telescopic structure is provided with a limiting structure on its inner or outer side. The limiting structure is a telescopic sleeve. The two ends of the telescopic sleeve between the end ring and the moving ring are respectively connected to the end ring and the moving ring. The two ends of the telescopic sleeve between adjacent moving rings are respectively connected to the adjacent moving ring. The two ends of the telescopic sleeve between the moving ring and the fixed ring are respectively connected to the moving ring and the fixed ring.

8. The tail nozzle structure according to claim 1, characterized in that: The locking ring and the fixing ring are rotatable relative to each other. The locking ring has several sliding holes. Each positioning rod includes a rod body and several positioning structures. The positioning structures are arranged along the axial direction of the rod body. There is a gap between adjacent positioning structures. The size of one end of the sliding hole is larger than the size of the positioning structure, and the size of the other end of the sliding hole is larger than the size of the rod body but smaller than the size of the positioning structure. When adjusting the tail nozzle outlet size, the positioning rod slides at one end of the sliding hole. After the tail nozzle outlet size is adjusted to the correct position, the locking ring is rotated so that the rod body between adjacent positioning structures is located at the other end of the sliding hole, thereby locking the positioning rod.

9. The tail nozzle structure according to claim 8, characterized in that: Each of the positioning structures includes several positioning plates, and each positioning plate is arranged along the circumference of the rod.

10. The tail nozzle structure according to claim 1, characterized in that: The sliding plate can be a sliding plate or a straight plate.

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