A multi-nozzle nozzle structure

Abstract

This application discloses a multi-nozzle nozzle structure, relating to the field of solid rocket engines, comprising a nozzle body, a plugging plate, a plugging plate cover, and a fixing member. The nozzle body is located within a housing and is provided with multiple nozzles. The plugging plate is connected to the nozzle body inlet side and is adhesively connected to the nozzle body. The plugging plate cover is located on the side of the plugging plate facing away from the nozzle body and is connected to the nozzle body by a fixing member. The integrated plugging plate design facilitates the consistency of the opening pressure of each nozzle, thereby improving the consistency of the timely opening of multiple nozzles of the nozzle.

Description

Technical Field

[0001] The invention relates to a novel multi-nozzle nozzle structure for a solid gas generator, belonging to the technical field of solid rocket engines. Background Art

[0002] The existing multi-nozzle nozzle structure for gas generators based on solid rocket engine technology must meet the requirements of structural integrity under high combustion chamber pressure, timely and normal opening of the plugging cover, and good opening consistency. This places high demands on the performance of the multi-nozzle nozzle, so the structural design and process of the multi-nozzle nozzle are crucial. At present, conventional gas generator nozzles have a large number of nozzle ports, and the plugging cover and internal surface require many repetitive operations during processing and installation, resulting in problems such as unstable nozzle performance and poor consistency. At the same time, the design of the nozzle internal surface is limited by the bonding and size of the plugging cover, and there is insufficient space for surface optimization, which cannot meet the diverse usage requirements. Therefore, it is very necessary to improve the nozzle structure, reduce the number of plugging covers, optimize the nozzle internal surface, and improve the stability and consistency of multi-nozzle performance. Summary of the Invention

[0003] The technical problem solved by the present invention is to overcome the shortcomings of the existing technology and provide a multi-nozzle nozzle structure with simple structure, simplified processing and installation process, timely and consistent opening of the plug cover, large space for optimization of the nozzle inner surface, and good performance stability.

[0004] The technical solution of the present invention is:

[0005] A multi-nozzle nozzle structure includes a nozzle body, a blocking piece, a blocking piece cover and a fixing piece;

[0006] The nozzle body is located in the shell, and the nozzle body is provided with multiple nozzles. The plugging piece is connected to the inlet side of the nozzle body. The plugging piece and the nozzle body are connected by gluing. The plugging piece cover is located on the side of the plugging piece away from the nozzle body. The plugging piece cover and the nozzle body are connected by a fixing part. The plugging piece cover presses the plugging piece, and the bonding strength between the plugging piece and the nozzle body is greater than the strength of the plugging piece itself.

[0007] The profile structure of the nozzle is arranged and distributed according to design requirements.

[0008] The distribution positions of the multiple nozzles should take into account the strength and ablation resistance of the nozzle body. The inner profile of a conventional nozzle is divided into a convergent section, a throat diameter, and an expansion section, which can be optimized arbitrarily according to actual needs.

[0009] The thickness and material of the plugging piece can be adjusted according to the opening pressure requirement. When the plugging piece is bonded, the flat state is consistent, there are no bubbles on the bonding surface with the nozzle body, and the bonding is firm.

[0010] The nozzle body and the housing are radially sealed by a sealing ring.

[0011] The single plugging piece is glued and fixed to the nozzle body by SW-2 glue.

[0012] The periphery of each nozzle is coated with glue to bond with the plugging piece; the plugging piece and the plugging piece cover shall not be glued; the bonding area of ​​the corresponding plugging piece near each nozzle opening shall be distributed uniformly.

[0013] The plugging cover is provided with a through hole corresponding to each nozzle, the number of the through holes is greater than the number of nozzle openings, the diameter of the through hole is not less than the diameter of the nozzle opening inlet, and the maximum diameter of the through hole is to ensure that the plugging piece is pressed tightly.

[0014] The blocking piece is provided with an air escape hole, which is directly opposite to the position of the nozzle body where no nozzle is provided.

[0015] The fixing members are evenly distributed on the edge circumference of the blocking cover; the fixing members are screws, pins or boss structures.

[0016] When the fixing part is a screw, the screw passes through the plug cover and is threadedly connected to the nozzle body. Before the glue is cured, the standard screws evenly distributed around the circumference are tightened with the same tightening torque to fix the plug cover to the nozzle, compress the plug in the middle, and ensure the consistency of the plug's flat state and the bonding strength.

[0017] An annular positioning step is provided on the inlet side of the nozzle body, and the plugging piece and the plugging piece cover are located inside the positioning step. The positioning step is used to radially position the plugging piece and the plugging piece cover.

[0018] The nozzle body is made of metal material, including any one or more of stainless steel and high-strength steel; the plugging plate cover is made of metal material with high melting point and ablation resistance; and the plugging plate is made of aluminum alloy material.

[0019] In summary, this application has at least the following beneficial technical effects:

[0020] (1) The plug has a large bonding area. Under the pressure of the plug cover, the bonding strength of the plug is much greater than its body strength. The principle of nozzle opening is the failure of the shear strength of the plug body. The integrated design of the plug is conducive to the consistency of the opening pressure of each nozzle, thereby improving the timely opening consistency of multiple nozzles of the nozzle;

[0021] (2) Specifying the screw tightening torque requirements for the plug cover is conducive to improving the consistency of plug compression and adhesive curing, thereby improving the consistency of opening performance between nozzles;

[0022] (3) The inner surface of the nozzle is not affected by the bonding of the plug and cover, and the surface can be optimized as needed;

[0023] (4) The adjustment is simple, and different nozzle opening performances can be obtained by replacing the thickness and material of a part (blocking piece), which has good applicability and scalability;

[0024] (5) The number of nozzle parts is greatly reduced, and the process bonding process is simplified, which effectively improves production efficiency, reduces product defect rate, and saves production costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a schematic diagram of a new multi-nozzle nozzle structure for a solid fuel gas generator and its installation structure according to an embodiment of the present invention.

[0026] Figure 2 for Figure 1 A partial enlarged view of .

[0027] Figure 3a a and b are respectively two-dimensional side view and front view schematic diagrams of the nozzle body of an embodiment of the present invention.

[0028] Figure 4a a and b are respectively two-dimensional side and front views of the plug cover according to an embodiment of the present invention.

[0029] In the figure: 1. Combustion chamber casing; 2. Retaining ring; 3. Nozzle body; 4. Sealing ring; 5. Screw; 6. Plug; 7. Plug cover. DETAILED DESCRIPTION

[0030] The present invention will be further described below in conjunction with the embodiments.

[0031] The present invention will be described in more detail below with reference to the accompanying drawings, which illustrate embodiments of the present invention. However, the present invention may be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the present invention to those skilled in the art. In the drawings, the sizes and relative sizes of layers and regions may be exaggerated for clarity.

[0032] The embodiment of the present application discloses a multi-nozzle nozzle structure, such as Figure 1 and Figure 2 As shown, it includes a combustion chamber casing 1, a retaining ring 2, a nozzle body 3, a sealing ring 4, a screw 5 (i.e., a fixing part), a blocking piece 6, and a blocking piece cover 7.

[0033] like Figure 3a and Figure 3b As shown, the nozzle body 3 is fixed to the combustion chamber shell 1 by a retaining ring 2, and the connection between the retaining ring 2 and the combustion chamber shell 1 can be a thread, a screw, etc.; a sealing ring 4 is used for radial sealing between the nozzle body 3 and the combustion chamber shell; the nozzle body 3 is made of metal material, which can be stainless steel and / or high-strength steel; the nozzle body 3 is designed with multiple nozzle inner surfaces as needed, including a convergent section, a throat diameter, and an expansion section, which can be designed and optimized according to actual conditions.

[0034] The plugging piece 6 is made of aluminum alloy and is fixed to the inlet side of the nozzle body 3 by SW-2 adhesive. The thickness of the plugging piece 6 can be adjusted according to the opening pressure requirement; the plugging piece 6 and the plugging piece cover 7 must not be glued together. Glue is applied around each nozzle to bond it to the plugging piece. The bonding area of ​​the plugging piece corresponding to each nozzle mouth should be the same. Under the pressure of the plugging piece cover, the bonding strength of the plugging piece should be much greater than its body strength.

[0035] The plugging piece 6 is provided with air escape holes. Multiple air escape holes can be provided based on the area of ​​the plugging piece 6 and the distribution of the through-holes. The air escape holes are located directly opposite the unvented areas of the nozzle body 3. Because the plugging piece has a large area, vacuum bubbles may form between the plugging piece 6 and the nozzle body 3 during bonding, affecting the bond strength and uniformity between the plugging piece 6 and the nozzle body 3. The provision of air escape holes allows these vacuum bubbles to escape through the holes, ensuring a high-quality bond.

[0036] like Figure 4a and Figure 4b As shown, the plug cover 7 is made of metal material with high melting point and ablation resistance. The screws 5 pass through the plug cover 7 and are threadedly connected to the nozzle body 3. The screws 5 are evenly distributed on the circumference of the edge position of the plug cover 7. The plug cover 7 is designed with a through hole corresponding to each nozzle. The number of through holes is more than the number of nozzle openings. The diameter of the through hole is not less than the nozzle opening inlet diameter. The maximum diameter of the through hole is to ensure that the plug 6 is pressed tightly. The nozzles on the nozzle body 3 are the same size, and the sizes of the through holes corresponding to the nozzles are also the same. Before the glue is solidified, the standard screws 5 evenly distributed around the circumference of the plug cover 7 are tightened with the same tightening torque to fix the plug cover 7 to the nozzle and press the plug 6 in the middle to ensure the consistency and bonding strength of the flat state of the plug 6.

[0037] like Figure 2 As shown, the screw 5 can be replaced with a pin or a boss structure for connection. The boss structure includes a protrusion and a groove respectively provided on the nozzle body 3 and the plug cover 7. The protrusion can move radially along the plug cover 7. The plug cover 7 can be fixed by moving the protrusion into the groove.

[0038] An annular positioning step is provided on the inlet side of the nozzle body 3 , and the blocking piece 6 and the blocking piece cover 7 are located inside the positioning step. The positioning step is used to radially position the blocking piece 6 and the blocking piece cover 7 .

[0039] The implementation principle of the present application is as follows: the multiple nozzles on the nozzle body 3 are sealed by an integrated design of a plug 6, and a designed bonding method is adopted between the plug 6 and the nozzle body, and the plug cover 7 is used to press the plug 6, so that the bonding strength of the plug 6 should be much greater than its body strength, so that the plug 6 at the nozzle can be destroyed to realize the opening of the nozzle, which is conducive to the consistency of the opening pressure of each nozzle, thereby improving the consistency of timely opening of multiple nozzles of the nozzle.

[0040] Although the present invention has been disclosed above in terms of preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art may make possible changes and modifications to the technical solutions of the present invention by using the methods and technical contents disclosed above without departing from the spirit and scope of the present invention. Therefore, any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solutions of the present invention shall fall within the scope of protection of the technical solutions of the present invention.

Claims

1. A multi-nozzle nozzle structure, characterized in that: It comprises a nozzle body (3), a blocking piece (6), a blocking piece cover (7) and a fixing part; The nozzle body (3) is located in the shell body, and the nozzle body (3) is provided with a plurality of nozzles. The plugging piece (6) is connected to the inlet side of the nozzle body (3), and the plugging piece (6) and the nozzle body (3) are connected by gluing. The plugging piece cover (7) is located on the side of the plugging piece (6) away from the nozzle body (3), and the plugging piece cover (7) and the nozzle body (3) are connected by a fixing piece. The plugging piece cover (7) presses the plugging piece (6), and the bonding strength between the plugging piece (6) and the nozzle body (3) is greater than the strength of the plugging piece (6). The plug (6) adopts an integrated design to block all nozzles.

2. The multi-nozzle nozzle structure according to claim 1, characterized in that: The nozzle body (3) and the housing are radially sealed via a sealing ring (4).

3. The multi-nozzle nozzle structure according to claim 1, characterized in that: The blocking piece (6) is glued and fixed to the nozzle body (3) by SW-2 glue.

4. The multi-nozzle nozzle structure according to claim 1, characterized in that: The periphery of each nozzle is coated with glue to bond with the plugging piece (6); the bonding area of ​​the plugging piece (6) corresponding to each nozzle nozzle should be distributed uniformly; the plugging piece (6) and the plugging piece cover (7) should not be glued together.

5. The multi-nozzle nozzle structure according to claim 1, characterized in that: The plugging cover (7) is provided with a through hole corresponding to each nozzle, the number of the through holes is greater than the number of nozzle openings, the diameter of the through hole is not less than the inlet diameter of the nozzle opening, and the maximum diameter of the through hole is to ensure that the plugging piece (6) is pressed tightly.

6. The multi-nozzle nozzle structure according to claim 1, characterized in that: The blocking piece (6) is provided with an air escape hole, and the air escape hole is directly opposite to the position of the nozzle body (3) where no nozzle is provided.

7. The multi-nozzle nozzle structure according to claim 1, characterized in that: The fixing members are evenly distributed on the edge circumference of the blocking cover (7); the fixing members are screws (5), pins or boss structures.

8. The multi-nozzle nozzle structure according to claim 7, characterized in that: When the fixing member is a screw (5), the screw (5) passes through the plug cover (7) and is threadedly connected to the nozzle body (3). Before the glue is cured, the standard screws (5) uniformly distributed around the circumference are tightened with the same tightening torque to fix the plug cover (7) to the nozzle and compress the middle plug (6).

9. The multi-nozzle nozzle structure according to claim 1, characterized in that: An annular positioning step is provided on the inlet side of the nozzle body (3), and the blocking piece (6) and the blocking piece cover (7) are located inside the positioning step. The positioning step is used to radially position the blocking piece (6) and the blocking piece cover (7).

10. The multi-nozzle nozzle structure according to claim 1, characterized in that: The nozzle body (3) is made of metal material; the blocking piece cover (7) is made of metal material; and the blocking piece (6) is made of aluminum alloy material.

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