A protective tool for blowing sand through the ventilation holes of an aircraft engine ignition nozzle

Abstract

This invention belongs to the field of aero-engine ignition nozzle tooling design, specifically relating to a sandblasting protection tooling for the ventilation hole of an aero-engine ignition nozzle. It includes: multiple pins (1); a planetary carrier (2); multiple springs (3); an adjusting ring (4); and an ignition nozzle (8). The multiple pins (1) are evenly arranged in a planetary configuration on the planetary carrier (2). The planetary carrier (2) has mounting holes. One end of each pin (1) passes through the mounting hole, and the other end of each pin (1) has an annular boss. A spring is fitted onto each pin (1), with one end contacting the bottom of the mounting hole. The other end of the spring (3) contacts the annular boss. Each pin (1) is supported by a spring (3). In the non-installation mode, the spring (3) separates the pin (1) from the product ventilation hole. The adjusting ring (4) is fitted onto the planetary carrier (2) to control the radial movement of the pin (1), achieving switching between blocked and separated states.

Description

Technical Field

[0001] This invention belongs to the field of tooling design for ignition nozzles of aero-engines, and specifically relates to a sand-blowing protective tooling for the ventilation holes of ignition nozzles of aero-engines. Background Technology

[0002] The ignition nozzle, mounted on the aircraft engine casing, converts the high pressure generated by the ignition device into a spark at the ignition end, igniting the air-fuel mixture in the combustion chamber. Ignition nozzles typically have side ventilation holes to allow low-temperature gas to flow in and cool the high-temperature ignition end, extending product lifespan. To clean the product surface and maintain high corrosion resistance, surface sandblasting is used to remove the oxide layer generated during production. Since the ventilation holes are located on the circumferential side of the product, if no shielding measures are taken during sandblasting, diamond grit can enter the product interior through these holes. Appropriately sized diamond grit can remain in the product's crevices, causing internal contamination. Therefore, a plugging solution must be used to protect the ventilation holes, preventing grit from entering at the source. Summary of the Invention

[0003] Purpose of the invention: To provide a protective tooling for sand blowing in the ventilation hole of an aero-engine ignition nozzle, which meets the need to prevent diamond powder from entering the ventilation hole during sand blowing and to avoid sand blowing obstruction to other parts.

[0004] Technical solution:

[0005] A sandblasting protective fixture for the ventilation hole of an ignition nozzle in an aircraft engine includes: multiple pins 1; a planetary carrier 2; multiple springs 3; an adjusting ring 4; and an ignition nozzle 8.

[0006] Multiple pins 1 are evenly arranged in a planetary configuration on a planetary carrier 2. The planetary carrier 2 is provided with mounting holes. One end of the pin 1 passes through the mounting hole, and the other end of the pin 1 is provided with an annular boss. A spring is sleeved on the pin 1, with one end contacting the bottom of the mounting hole. The other end of the spring 3 contacts the annular boss. Each pin 1 is supported by the spring 3. In the non-installation mode, the spring 3 separates the pin 1 from the product ventilation hole. An adjusting ring 4 is sleeved on the planetary carrier 2 to control the radial movement of the pin 1, realizing the switching between the blocked and separated states.

[0007] Furthermore, it also includes: a track screw 5, the end of which is an outer cone shape, and an inner concave cone groove is provided on the outer side of the planetary carrier 2. The two work together to fix the motion track during the adjustment process.

[0008] Furthermore, it also includes: base 6 and positioning pin 7,

[0009] The base 6 has a cylindrical structure and a hexagonal wall in the inner hole. The hexagonal wall is matched with the hexagonal structure of the ignition nozzle 8. The planetary carrier 2 has a pin hole at the bottom. The base 6 is used to position the ventilation hole of the ignition nozzle 8. The positioning pin 7 is matched with the pin hole at the bottom of the planetary carrier 2 and fixed on the base 6, so that the planetary carrier 2 and the base 6 remain relatively stationary in a circle.

[0010] Furthermore, the pin 1 is made of polytetrafluoroethylene elastic material, and the fit with the product ventilation hole is at an 80° cone angle. When the hole is blocked, it fits tightly and without gaps with the ventilation hole, so that diamond powder cannot enter the ventilation hole at all.

[0011] Furthermore, the pin 1 is separated from the ventilation hole by the support of the spring 3.

[0012] Furthermore, the end of the pin 1 is cam-shaped, and the inner wall of the adjusting ring 4 is provided with an arc surface, a tangent surface, and a positioning surface to realize the radial movement and fixation of the pin 1.

[0013] Furthermore, there are three track screws 5, which are evenly distributed in three equal parts along the circumference of the planet carrier 2 to stabilize the structure.

[0014] Furthermore, the track screw 5 and the adjusting ring 4 are connected by threads, which are used to adjust the threads to achieve a tight fit between the screw and the moving track.

[0015] Beneficial effects:

[0016] This invention employs a planetary-type pin layout for ventilation hole protection. A cam-type adjusting ring is designed on the periphery of the planetary carrier, which, in conjunction with a return spring, enables quick mounting and dismounting of the pin. By designing the planetary carrier 2 to cooperate with the pin 1, sand and gravel are prevented from entering the ventilation holes during sandblasting by the aero-engine ignition nozzle 8, thus avoiding excess sand and gravel inside the product. Simultaneously, the tooling is prevented from obstructing other parts requiring sandblasting, ensuring product appearance consistency. The adjusting ring structure, using a screw-on method, enables quick mounting and dismounting of the tooling on the product, improving production efficiency. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the ignition nozzle after protection by the tooling of the present invention.

[0018] Figure 2 This is a horizontal cross-sectional view of the planetary carrier of the present invention.

[0019] Figure 3 This is a vertical cross-sectional view of the planetary carrier and the track screw assembly of the present invention.

[0020] The components include: 1. Pin; 2. Planetary carrier; 3. Spring; 4. Adjusting ring; 5. Track screw; 6. Base; 7. Positioning pin; 8. Ignition nozzle. Detailed Implementation

[0021] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0022] The technical solution created by the present invention will be described in detail with reference to the accompanying drawings and specific embodiments.

[0023] like Figure 1-3 A sandblasting protective fixture for the ventilation holes of an aero-engine ignition nozzle 8 includes a pin 1, a planetary carrier 2, a spring 3, an adjusting ring 4, a track screw 5, a base 6, and a positioning pin 7.

[0024] like Figure 2 As shown, six pins 1 are evenly arranged in a planetary pattern on the planet carrier 2; each pin 1 is supported by a spring 3; an adjusting ring 4 is fitted onto the planet carrier 2, wherein the protrusion of the pin 1 contacts and engages with the groove of the adjusting ring 4; three track screws 5 are screwed in until they just contact the track groove of the planet carrier 2; a positioning pin 7 is embedded in the base 6; the planet carrier 2 and the base 6 are coaxially slidably mounted, and the positioning pin 7 engages with the groove of the planet carrier 2.

[0025] Planetary carrier 2, adjusting ring 4, base 6, and ignition nozzle 8 are all coaxially mounted. Ignition nozzle 8 and base 6 are circumferentially limited by the product's hexagonal groove. Base 6 and planetary carrier 2 are circumferentially limited by locating pin 7. Planetary carrier 2 and adjusting ring 4 are vertically limited by track screw 5. As the depth of the groove in adjusting ring 4 decreases, when the axial compressive force on pin 1 exceeds the supporting force provided by spring 3, pin 1 moves inward; as the depth of the groove in adjusting ring 4 increases, when the supporting force on pin 1 provided by spring 3 exceeds the axial compressive force, pin 1 moves outward. The hexagonal groove is designed to fit the product, achieving circumferential angle limit control.

[0026] Assembly process:

[0027] Tooling Assembly: Place the planetary carrier 2 horizontally. Insert multiple springs 3 into the holes of the planetary carrier 2, and fit multiple pins 1 onto the springs 3. Pull the pins 1 from inside the planetary carrier 2 to compress the springs 3. Then, fit an adjusting ring 4 onto the outer ring of the planetary carrier 2. Loosen the pins 1 and adjust the adjusting ring 4 appropriately so that the end of the pin 1 is located on the inner arc surface of the adjusting ring 4. Screw the track screw 5 into the outer circumference of the adjusting ring 4 so that the outer cone angle of the track screw 5 contacts and engages with the inner cone angle of the outer circumference of the planetary carrier 2. At this time, the adjusting ring 4 can rotate relative to the circumference of the planetary carrier 2, but cannot move relative to the axial direction. The above assembly is the assembly of assembly 1. Install the locating pin 7 on the base 6 to form assembly 2.

[0028] Tooling and Ignition Nozzle Assembly: Assemble the ignition nozzle 8 by fitting its six sides to the hexagonal walls of the base 6. Fit assembly 1 onto assembly 2, aligning the pin hole of the planetary carrier 2 with the positioning pin 7. Rotate the adjusting ring 4 clockwise to axially compress the pin 1 until it tightly engages with the ignition nozzle 8, and then fix it to the positioning surface of the adjusting ring 4. At this point, assembly 1 and the ignition nozzle 8 are complete and can be removed from assembly 2. After the ventilation holes are protected, the ignition nozzle 8 can be surface-blasted with sandblasting.

[0029] Tooling and Ignition Nozzle Disassembly: Place assembly 1 onto assembly 2, aligning the pin hole of planetary carrier 2 with the locating pin 7. By rotating adjusting ring 4 counterclockwise, the axial pressure on pin 1 is gradually released. Pin 1, supported by spring 3, loosens its engagement with the ignition nozzle 8, and pin 1 is fixed on the arc surface. After removing assembly 1 from assembly 2, remove the ignition nozzle 8 from base 6.

[0030] The working principle is as follows:

[0031] In its free state, the base 6 is separated from the planetary carrier 2, and the protrusion of the pin 1 is located in the groove of the planetary carrier 2. When the ignition nozzle 8 needs to be sandblasted for ventilation hole protection, the ignition nozzle 8 is placed in the base 6, and then the planetary carrier 2 is assembled with the base 6. The adjusting ring 4 is turned clockwise until the shallow groove contacts the protrusion of the pin 1, pressing the pin 1 into the ventilation hole of the ignition nozzle 8 to achieve tight protection of the ventilation hole. The planetary carrier 2, including the ignition nozzle 8, is removed from the base 6, and the surface of the ignition nozzle 8 after ventilation hole protection can be sandblasted. After sandblasting, the planetary carrier 2 is reinstalled on the base 6, and the adjusting ring 4 is turned counterclockwise until the deep groove contacts the protrusion of the pin 1. The pin 1 is pulled out from the ventilation hole of the ignition nozzle 8 by the support force of the spring 3. The base 6 and the planetary carrier 2 are disassembled and separated, and the sandblasted ignition nozzle 8 is taken out from the base 6.

Claims

1. A protective fixture for blowing sand through the ventilation hole of an ignition nozzle in an aircraft engine, characterized in that, include: Multiple pins, planetary carriers, multiple springs, adjusting rings, base, locating pins, Multiple pins are evenly arranged in a planetary configuration on a planetary carrier. The planetary carrier has mounting holes; one end of each pin passes through the mounting hole, and the other end has an annular boss. A spring is fitted onto the pin, with one end contacting the bottom of the mounting hole and the other end contacting the annular boss. Each pin is supported by a spring. In non-mounted mode, the spring separates the pin from the product's ventilation holes. An adjusting ring is fitted onto the planetary carrier to control the radial movement of the pins, switching between blocked and open states. The base has a cylindrical structure with a hexagonal inner wall, which mates with the hexagonal structure of the ignition nozzle. A pin hole is located at the bottom of the planetary carrier. The base is used to position the ventilation holes of the ignition nozzle. A positioning pin engages with the pin hole at the bottom of the planetary carrier, fixing it to the base and maintaining a relatively stationary circumferential relationship between the planetary carrier and the base. The pin end is cam-shaped. The inner wall of the adjusting ring has an arc surface, a tangent surface, and a positioning surface, enabling radial movement and fixation of the pin.

2. The sandblasting protective fixture for the ventilation hole of the aero-engine ignition nozzle according to claim 1, characterized in that, Also includes: The track screw has an outer conical end and an inner concave conical groove on the outside of the planetary carrier. The two work together to fix the movement track during the adjustment process.

3. The sandblasting protective fixture for the ventilation hole of the aero-engine ignition nozzle according to claim 1, characterized in that, The pin is made of polytetrafluoroethylene elastic material, and the fit with the product ventilation hole is at an 80° cone angle. When the hole is blocked, it fits tightly with the ventilation hole without any gaps, and diamond powder cannot enter the ventilation hole at all.

4. The sandblasting protective fixture for the ventilation hole of the aero-engine ignition nozzle according to claim 1, characterized in that, The pin is separated from the ventilation hole by the support of the spring.

5. The sandblasting protective fixture for the ventilation hole of the aero-engine ignition nozzle according to claim 1, characterized in that, There are three track screws, which are evenly distributed in three equal parts along the circumference of the planetary carrier to ensure structural stability.

6. The sandblasting protective fixture for the ventilation hole of the aero-engine ignition nozzle according to claim 1, characterized in that, The track screw and the adjusting ring are connected by threads, which are used to adjust the threads to achieve a tight fit between the screw and the moving track.

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