A dilating segment structure

Abstract

The expansion section structure comprises an expansion section heat insulation layer, an expansion section shell and a reinforcing ring; the expansion section heat insulation layer and the expansion section shell are bonded by high-temperature-resistant sealing glue; the expansion section heat insulation layer and the expansion section shell are also fixed radially by a countersunk screw; the reinforcing ring is embedded in the expansion section heat insulation layer and is threadedly connected with the expansion section shell through a flange. The expansion section structure has higher connection strength between the expansion section heat insulation layer and the expansion section shell, solves the problem that the expansion section heat insulation layer and the shell are prone to connection failure under long-time high-temperature and high-pressure conditions, the reinforcing ring is located at the outer circle of the expansion section heat insulation layer, has good assembly operability, the flange structure is easy to process and has good processability, and the use of the reinforcing ring connection structure greatly reduces the thickness of the expansion section heat insulation layer increased for meeting the use temperature of the glue layer, and reduces the cost and quality of the expansion section heat insulation layer.

Description

Technical Field

[0001] This invention belongs to the field of solid rocket engine technology, specifically relating to an expansion section structure for a solid rocket engine nozzle. Background Technology

[0002] The expansion section of a solid rocket motor nozzle operates under harsh conditions, needing to withstand the direct impact of high-temperature, high-pressure exhaust gases and heat conduction from these gases into the expansion section's interior. The expansion section's insulation layer is typically bonded to the outer shell using high-temperature adhesive. To prevent the insulation layer from failing under high-speed exhaust flow and flying out, radial screws are often used to connect the expansion section shell and the insulation layer. However, under prolonged high-temperature, high-pressure exhaust heat transfer, and with limited insulation layer thickness, the temperature between the insulation layer and the shell far exceeds the normal operating temperature range of the adhesive layer. This leads to adhesion failure, and the radial screws, with their limited shear capacity, are insufficient to resist the airflow. Therefore, given the engine's long-term operation and the limited expansion section size, improving the expansion section structure and enhancing the connection strength between the insulation layer and the shell under prolonged high-temperature conduction becomes crucial.

[0003] like Figure 1 An existing rocket engine nozzle expansion section includes an inner carbon / carbon composite expansion section and an outer layer wrapped with a high-silica cloth / phenolic material. Grooves and bosses are machined onto the small end of the carbon / carbon composite expansion section to facilitate the wrapping of the high-silica cloth / phenolic material.

[0004] like Figure 2 Another existing nozzle structure includes a throat liner, a backing, an insulation layer, a nozzle shell, and a diffuser section, wherein the nozzle diffuser section is molded on the nozzle shell by tooling, and the inner surface of the diffuser section is provided with distributed protrusions.

[0005] In existing technologies, the expansion section and the shell are integrally molded. The unevenness on the surface of the expansion section requires electrical discharge machining or irregular shaping, and it also requires integral molding tooling, which is complex and costly. In practical applications, if quality problems occur, the entire section must be replaced, and partial repair is not possible. Summary of the Invention

[0006] The purpose of this invention is to provide an expansion section structure that solves the problem of easy connection failure between the insulation layer of the expansion section and the shell under long-term high temperature and high pressure conditions.

[0007] To achieve the above objectives, the present invention provides an expansion section structure, including an expansion section insulation layer, an expansion section shell, and a reinforcing ring; the expansion section insulation layer and the expansion section shell are bonded together with a high-temperature resistant sealant; the expansion section insulation layer and the expansion section shell are also radially fixed together by countersunk screws; the reinforcing ring is embedded in the expansion section insulation layer and is threadedly connected to the expansion section shell by a flange.

[0008] In the above-mentioned expansion section structure, the end of the expansion section shell is provided with a flange, and several through holes are formed on the flange; the outer surface of the expansion section insulation layer is provided with a groove, the reinforcing ring is embedded in the groove, the reinforcing ring is also provided with a flange, the flange extends out of the groove, and several threaded holes are formed on the flange; the expansion section shell and the reinforcing ring are connected by hexagonal screws, threaded holes and through holes.

[0009] The aforementioned expansion section structure includes an expansion section shell comprising a straight cylindrical section and a conical cylindrical section; an expansion section insulation layer comprising a straight cylindrical section and a conical cylindrical section, wherein the outer surface of the expansion section insulation layer matches the inner surface of the expansion section shell; and a flange is provided on the conical cylindrical section of the expansion section shell.

[0010] In the aforementioned expansion section structure, the reinforcing ring is positioned such that, in the axial direction of the expansion section insulation layer, the reinforcing ring is at a distance from the small end of the conical cylindrical section of the expansion section insulation layer. The axial length of the conical section of the expansion section insulation layer; the embedding depth of the reinforcing ring is ≤ 1 / 3 of the thickness of the expansion section insulation layer at the embedding location; the embedding surface of the reinforcing ring matches the surface of the groove on the outer surface of the expansion section insulation layer; the reinforcing ring and the expansion section insulation layer are cured with E-7 glue or other high-temperature resistant glue.

[0011] In the aforementioned expansion section structure, the reinforcing ring is circumferentially divided into two parts, which are respectively connected to the expansion section shell and the expansion section insulation layer.

[0012] In the aforementioned expansion section structure, the reinforcing ring is made of aluminum alloy, titanium alloy, or high-strength steel.

[0013] In the aforementioned expansion section structure, the expansion section insulation layer is used to resist heat conduction from high-temperature gas to the expansion section shell; the expansion section insulation layer is made of high-silica / phenolic winding material, which is used to further expand the high-temperature and high-pressure gas to do work and provide thrust for the solid rocket engine.

[0014] In the above-mentioned expansion section structure, the expansion section shell is used to provide structural strength for the nozzle and resist the erosion of high-temperature and high-pressure gas; the expansion section shell is made of aluminum alloy, titanium alloy or high-strength steel; the cone angle of the conical section of the expansion section shell is 15° to 20°.

[0015] Compared with the prior art, the beneficial technical effects of the present invention are:

[0016] (1) The flange connection of the reinforcing ring greatly improves the connection strength between the expansion section insulation layer and the expansion section shell;

[0017] (2) The reinforcing ring is located on the outer ring of the expansion section insulation layer, which makes assembly and operation easy, and the flange structure is easy to process and has good manufacturability;

[0018] (3) The use of enhanced ring connection structure greatly reduces the thickness of the expansion section insulation layer required to meet the service temperature of the adhesive layer, thus reducing the cost and quality of the expansion section insulation layer. Attached Figure Description

[0019] The expansion segment structure of the present invention is given by the following embodiments and figures.

[0020] Figure 1 This is a schematic diagram of the expansion section of a rocket engine nozzle.

[0021] Figure 2 This is a schematic diagram of another existing nozzle structure.

[0022] Figure 3 This is a schematic diagram of the expansion segment structure according to an embodiment of the present invention.

[0023] Figure 4 This is a two-dimensional schematic diagram of the reinforcing ring in an embodiment of the present invention. Detailed Implementation

[0024] The following will combine Figures 3-4 The expansion segment structure of the present invention will be described in further detail.

[0025] Figure 3 The diagram shown is a schematic diagram of the expansion segment structure according to an embodiment of the present invention.

[0026] like Figure 3 The expansion section structure in this embodiment includes an expansion section insulation layer 1, an expansion section shell 3, and a reinforcing ring 2;

[0027] The expansion section insulation layer 1 is used to resist the heat conduction from high-temperature gas to the expansion section shell 3, and the expansion section shell 3 is used to provide the structural strength of the nozzle and resist the scouring of high-temperature and high-pressure gas.

[0028] The expansion section shell 3 includes a straight cylindrical section and a conical cylindrical section;

[0029] The expansion section insulation layer 1 includes a straight cylindrical section and a conical cylindrical section, and the outer surface of the expansion section insulation layer 1 matches the inner surface of the expansion section shell 3.

[0030] The expansion section insulation layer 1 and the expansion section shell 3 are bonded together with high-temperature resistant sealant. Specifically, the inner surface of the expansion section shell 3 and the outer surface of the expansion section insulation layer 1 are bonded together with high-temperature resistant sealant.

[0031] The expansion section insulation layer 1 and the expansion section shell 3 are also radially fixed by countersunk screws 4;

[0032] The reinforcing ring 2 is embedded in the insulation layer 1 of the expansion section and is threadedly connected to the expansion section shell 3 via a flange.

[0033] In summary, the expansion section structure of this embodiment includes the following connection methods between the expansion section insulation layer 1 and the expansion section shell 3: adhesive bonding, countersunk screw radial fixing, and reinforcing ring flange connection. Compared with the traditional nozzle expansion section structure, the expansion section structure of this embodiment has a higher connection strength between the expansion section insulation layer and the expansion section shell, solving the problem of easy connection failure between the expansion section insulation layer and the shell under long-term high temperature and high pressure conditions.

[0034] See Figure 3 and Figure 4 The expansion section housing 3 has a flange at the end of the conical cylindrical section, and several through holes are formed on the flange. The outer surface of the expansion section insulation layer 1 has a groove, and the reinforcing ring 2 is embedded in the groove. The reinforcing ring 2 also has a flange 21, which extends out of the groove. Several threaded holes 22 are formed on the flange 21. The number of threaded holes 22 on the flange 21 of the reinforcing ring 2 is equal to the number of through holes on the flange of the expansion section housing 3, and their positions are opposite. The expansion section housing 3 and the reinforcing ring 2 are connected by hexagon socket screws 5, threaded holes 21, and through holes.

[0035] Preferably, the position of the reinforcing ring 2 is such that, in the axial direction of the expansion section insulation layer 1, the reinforcing ring 2 is at a distance from the small end of the conical cylindrical section of the expansion section insulation layer 1. The axial length of the conical section of the expansion section insulation layer 1; the embedding depth of the reinforcing ring 2 is ≤ 1 / 3 of the thickness of the expansion section insulation layer 1 at the embedding location; the embedding surface of the reinforcing ring 2 matches the surface of the groove on the outer surface of the expansion section insulation layer 1, that is, the embedding part of the reinforcing ring 2 is tightly fitted with the groove; the reinforcing ring is divided into two parts circumferentially, which are respectively connected to the expansion section shell and the expansion section insulation layer.

[0036] Preferably, the reinforcing ring 2 and the expansion section insulation layer 1 are cured with E-7 adhesive or other high-temperature resistant adhesive.

[0037] Preferably, the expansion section insulation layer 1 is made of high silica / phenolic resin winding material, which is used to further expand the high temperature and high pressure gas to do work and provide thrust for the solid rocket engine.

[0038] The expansion section shell 3 is made of metal materials, such as aluminum alloy, titanium alloy or high-strength steel; the cone angle of the conical section of the expansion section shell 3 is 15° to 20°.

[0039] The reinforcing ring 2 is made of metal materials, such as aluminum alloy, titanium alloy or high-strength steel;

[0040] The expansion section insulation layer 1 and the expansion section shell 3 are bonded together with E-7 glue or other high-temperature resistant sealant, and must not be detached or missing.

Claims

1. An expansion segment structure, characterized in that, It includes an expansion section insulation layer, an expansion section shell, and a reinforcing ring; the expansion section insulation layer and the expansion section shell are bonded together with high-temperature resistant sealant; the expansion section insulation layer and the expansion section shell are also radially fixed by countersunk screws; the reinforcing ring is embedded in the expansion section insulation layer and is threadedly connected to the expansion section shell by a flange; The expansion section shell has a flange at its end, and several through holes are formed on the flange; the outer surface of the expansion section insulation layer has a groove, and the reinforcing ring is embedded in the groove. The reinforcing ring also has a flange, which extends out of the groove, and several threaded holes are formed on the flange; the expansion section shell and the reinforcing ring are connected by hexagonal screws, threaded holes and through holes.

2. The expansion segment structure as described in claim 1, characterized in that, The expansion section shell includes a straight cylindrical section and a conical cylindrical section; the expansion section insulation layer includes a straight cylindrical section and a conical cylindrical section, and the outer surface of the expansion section insulation layer matches the inner surface of the expansion section shell; a flange is provided on the conical cylindrical section of the expansion section shell.

3. The expansion segment structure as described in claim 1, characterized in that, The reinforcing ring is positioned such that, in the axial direction of the expansion section insulation layer, the distance between the reinforcing ring and the small end of the conical section of the expansion section insulation layer is greater than [missing information]. Axial length of the conical section of the expansion section insulation layer.

4. The expansion segment structure as described in claim 1, characterized in that, The embedding depth of the reinforcing ring is ≤ 1 / 3 of the thickness of the insulation layer of the expansion section at the embedding location.

5. The expansion segment structure as described in claim 1, characterized in that, The inner surface of the reinforcing ring matches the outer surface groove of the expansion section insulation layer, and the reinforcing ring and the expansion section insulation layer are cured with E-7 glue or other high-temperature resistant glue.

6. The expansion segment structure as described in claim 1, characterized in that, The reinforcing ring is divided into two parts circumferentially, which are connected to the expansion section shell and the expansion section insulation layer, respectively.

7. The expansion segment structure as described in claim 1, characterized in that, The reinforcing ring is made of aluminum alloy, titanium alloy or high-strength steel.

8. The expansion segment structure as described in claim 1, characterized in that, The expansion section insulation layer is used to resist heat conduction from high-temperature gas to the expansion section shell; the expansion section insulation layer is made of high-silica / phenolic winding material, which is used to further expand the high-temperature and high-pressure gas to do work and provide thrust for the solid rocket engine.

9. The expansion segment structure as described in claim 1, characterized in that, The expansion section shell is used to provide structural strength for the nozzle and resist the erosion of high-temperature and high-pressure gas; the expansion section shell is made of aluminum alloy, titanium alloy or high-strength steel; the cone angle of the conical section of the expansion section shell is 15° to 20°.

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