A liquid rocket engine gas generator bottom component assembly device

Abstract

This invention relates to an assembly device for the bottom component of a liquid rocket engine gas generator, belonging to the field of mechanical manufacturing and processing. The device features symmetrically arranged lifting shafts on the side walls of a base. Graphite rings are placed around the circumference of the upper surface of the base plate. The lower half of the external gas generator rests on the graphite rings. The base plate has uniformly distributed through holes. A support rod is inserted above each through hole. A graphite pad is installed on the top of each support rod. Pins extend sequentially from top to bottom into the through holes of the graphite pads and support rods. An external gas generator nozzle is installed on the top of each graphite pad. The upper half of the external gas generator is mounted on top of the lower half. An inclined through hole is provided on the inner wall of the upper half of the external gas generator. An inspection pin is installed in the inclined through hole. This invention is specifically designed for the assembly and brazing process of the bottom component of a gas generator, solving the problems of positioning and brazing quality in the assembly of a large number of nozzles, and effectively improving assembly efficiency.

Description

Technical Field

[0001] This invention belongs to the field of mechanical manufacturing and processing, and relates to an assembly device for the bottom component of a liquid rocket engine gas generator. Background Technology

[0002] The gas generator is a core component of a liquid rocket engine. It uses the high-temperature gas generated by combustion to drive a turbopump, continuously circulating the propellant necessary for the engine's operation. Its operational reliability directly affects the normal functioning of the liquid rocket engine. The ability of the gas generator nozzle to provide stable combustion under specific mixture ratios is a key indicator, directly determined by the quality of the brazing and assembly of the nozzle and bottom assembly. Without an assembly device for the bottom assembly, three disadvantages are: first, it's impossible to guarantee the required nozzle mounting height within the lower half of the product's inner bore; second, with a large number of nozzles, it's difficult to ensure the coaxiality of the nozzles mounted in the lower half's inner bore with those in the upper half; and third, after the upper half is assembled, it's impossible to directly observe whether the nozzles are properly installed, or to identify and correct any missing nozzles. Summary of the Invention

[0003] The technical problem solved by this invention is to overcome the shortcomings of the prior art and propose an assembly device for the bottom component of a liquid rocket engine gas generator, which is specifically used for the assembly and brazing process of the bottom component of the gas generator. This solves the problems of positioning and brazing quality of a large number of nozzles in the product and effectively improves the assembly efficiency.

[0004] The solution of the present invention is:

[0005] An assembly device for the bottom component of a liquid rocket engine gas generator includes pins, graphite pads, support rods, lifting shafts, graphite rings, a base, and inspection pins. The external gas generator comprises a lower half, a nozzle, and an upper half. The base is horizontally positioned. Lifting shafts are symmetrically arranged on the side walls of the base. Graphite rings are placed around the circumference of the upper surface of the base plate. The lower half of the external gas generator rests on the graphite rings. The base plate has uniformly distributed through holes. A support rod is inserted above each through hole. A graphite pad is installed on the top of each support rod. Each support rod corresponds to… One pin; holes are provided at the center of both the support rod and the graphite pad; the pin extends sequentially from top to bottom into the through holes of the graphite pad and the support rod; one external gas generator nozzle is installed on the top of each graphite pad; the external gas generator nozzle is coaxially mounted with the support rod; the upper part of the external gas generator is installed on top of the lower part of the external gas generator; the inner wall of the upper part of the external gas generator is provided with inclined through holes, each inclined through hole communicating with the top of the external gas generator nozzle; an inspection pin is installed in the inclined through holes to inspect the position of the external gas generator nozzle.

[0006] In the aforementioned liquid rocket engine gas generator bottom component assembly device, a graphite pad is placed between the external gas generator nozzle and the support rod to prevent the external gas generator nozzle and the support rod from sticking together during the brazing process.

[0007] In the aforementioned liquid rocket engine gas generator bottom component assembly device, the diameter of the graphite pad is larger than the diameter of the support rod to prevent the support rod from sticking to the inner hole of the lower half of the external gas generator nozzle during the brazing process.

[0008] In the aforementioned liquid rocket engine gas generator bottom component assembly device, the support rod has two vent holes; the diameter of the vent holes is 5mm, which enables venting during the brazing process.

[0009] In the aforementioned liquid rocket engine gas generator bottom component assembly device, a graphite ring is placed between the lower half of the external gas generator and the base to prevent the lower half of the external gas generator from sticking to the base during the brazing process.

[0010] In the aforementioned liquid rocket engine gas generator bottom component assembly device, the base is made of stainless steel 1Cr18Ni9Ti material; the bottom of the lower half of the external gas generator is provided with through holes, and the through holes are distributed in the same way as the through holes on the base.

[0011] In the aforementioned liquid rocket engine gas generator bottom component assembly device, six support blocks are evenly distributed on the outer side of the base bottom surface, so that the heated gas can enter through the through hole of the base during the brazing process, achieving uniform heating; six reinforcing ribs are evenly distributed on the inner side wall of the base to prevent the base from deforming during the brazing process.

[0012] In the aforementioned liquid rocket engine gas generator bottom component assembly device, the support rod and the through hole on the base are clearance-fitted.

[0013] In the above-mentioned liquid rocket engine gas generator bottom component assembly device, the assembly device also includes a calibration template; the calibration template is provided with through holes that are consistent with the distribution of the external gas generator nozzles; after the external gas generator nozzles are installed on the graphite pad, the calibration template is installed from the top of the external gas generator nozzles downwards, so that the external gas generator nozzles pass through the holes on the calibration template, so that the external gas generator nozzles are in a vertically upward state.

[0014] In the aforementioned liquid rocket engine gas generator bottom component assembly device, the inspection pin has six engraved lines. The inspection pin is inserted through the oblique hole in the upper part of the external gas generator, and the position of the engraved lines is used to determine whether the product nozzle is in the correct position.

[0015] The advantages of this invention compared to the prior art are:

[0016] (1) This invention ensures that the assembly height of the product nozzle and the lower half of the product meets the requirements;

[0017] (2) The present invention ensures that the product will not stick to the assembly device during the brazing process by using a graphite pad and a graphite ring; the diameter of the graphite pad is larger than the diameter of the support rod, ensuring that the support rod will not stick to the inner hole of the lower half of the product during the brazing process.

[0018] (3) The support rod designed in this invention has two vent holes with a diameter of 5mm, which helps the airflow to be evenly distributed in the lower half of the product during the brazing process and improves the brazing quality.

[0019] (4) The calibration template designed in this invention can determine the installation position of the nozzle of the product and its coaxiality with the upper hole of the upper part before the upper part of the product is installed.

[0020] (5) The inspection pin designed in this invention can inspect whether the nozzle has fallen off when the nozzle cannot be directly observed. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the assembly device structure of the present invention;

[0022] Figure 2 This is a schematic diagram of the calibration template for this invention;

[0023] Figure 3 This is a front view of the base of the present invention;

[0024] Figure 4 This is a bottom view of the base of the present invention.

[0025] In the picture:

[0026] 1-Pin; 2-Graphite pad; 3-Support rod; 4-Hanging shaft; 5-Graphite ring; 6-Base; 7-Correction template; 8-Inspection pin. Detailed Implementation

[0027] The present invention will be further described below with reference to the embodiments.

[0028] This invention provides an assembly device for the bottom components of a liquid rocket engine gas generator. This device is convenient to use, offers high assembly precision, provides verifiable assembly results, and ensures a reliable brazing process. It is specifically designed for the brazing process of the bottom components of a gas generator. This device solves the problems of positioning and brazing quality in the assembly of a large number of nozzles, effectively improving assembly efficiency.

[0029] Liquid rocket engine gas generator bottom component assembly device, such as Figure 1As shown, the external gas generator includes a pin 1, a graphite pad 2, a support rod 3, a lifting shaft 4, a graphite ring 5, a base 6, and an inspection pin 8. The external gas generator comprises a lower part, a nozzle, and an upper part. The base 6 is placed horizontally. The lifting shaft 4 is symmetrically arranged on the side wall of the base 6. The graphite ring 5 is placed on the circumference of the upper surface of the base plate of the base 6. The lower part of the external gas generator rests on the graphite ring 5. The base plate of the base 6 has evenly spaced through holes. One support rod 3 is inserted above each through hole. One graphite pad 2 is installed on the top of each support rod 3. Each support rod 3 corresponds to one pin. 1; A hole is provided at the center of both the support rod 3 and the graphite pad 2; The pin 1 extends into the through hole of the graphite pad 2 and the support rod 3 from top to bottom; An external gas generator nozzle is installed on the top of each graphite pad 2; The external gas generator nozzle is coaxially installed with the support rod 3; The upper part of the external gas generator is installed on the top of the lower part of the external gas generator; An inclined through hole is provided on the inner wall of the upper part of the external gas generator, and each inclined through hole communicates with the top of the external gas generator nozzle; The inspection pin 8 is installed in the inclined through hole to check the position of the external gas generator nozzle.

[0030] A graphite pad 2 is placed between the external gas generator nozzle and the support rod 3 to prevent them from sticking together during brazing. The diameter of the graphite pad 2 is larger than the diameter of the support rod 3 to prevent the support rod 3 from sticking to the inner hole of the lower half of the external gas generator nozzle during brazing. A graphite ring 5 is placed between the lower half of the external gas generator and the base 6 to prevent them from sticking together during brazing.

[0031] The support rod 3 has two vent holes with a diameter of 5mm, which are used to vent air during the brazing process.

[0032] like Figure 3 , Figure 4 As shown, the base 6 is made of 1Cr18Ni9Ti stainless steel. The bottom of the lower half of the external gas generator has through holes, and these through holes are distributed in the same manner as those on the base 6. Six support blocks are evenly distributed on the outer side of the base 6's bottom surface, allowing heated gas to enter through the through holes during brazing and ensuring uniform heating. Six reinforcing ribs are evenly distributed on the inner wall of the base 6 to prevent deformation during brazing.

[0033] The support rod 3 and the through hole on the base 6 are clearance fit.

[0034] The assembly device also includes a calibration template 7, such as Figure 2As shown, the calibration template 7 is provided with through holes that are consistent with the distribution of the external gas generator nozzles; after the external gas generator nozzles are installed on the graphite pad 2, the calibration template 7 is installed from the top of the external gas generator nozzles downwards, so that the external gas generator nozzles pass through the holes on the calibration template 7, so that the external gas generator nozzles are in a vertically upward state.

[0035] The inspection pin 8 has six engraved lines. The inspection pin 8 is inserted through the oblique hole in the upper part of the external gas generator. The position of the engraved lines is used to determine whether the product nozzle is in the correct position.

[0036] The working principle of this invention is as follows: A graphite ring is placed on a base, and a support rod is installed in the inner hole of the base, with a clearance fit between the support rod and the hole. Then, a graphite pad and the support rod are fixed by a pin. The diameter of the graphite pad is larger than the diameter of the support rod, but both are smaller than the diameter of the inner hole of the lower half of the product, so that the lower half of the product can be fitted onto the support rod from top to bottom and then installed into the stepped hole of the graphite ring. The height of the support rod is controlled to meet the height difference requirements between the lower half of the product and the product nozzle. Subsequently, the product nozzles are installed one by one into the inner hole of the lower half of the product and rest on the graphite pad. The calibration template has holes distributed in the same way as those on the upper half of the product. After all nozzles are installed, the installation position of each nozzle is checked by fitting it onto the calibration template to ensure the coaxiality of the upper hole and the nozzle after the upper half of the product is installed. After the check, the state of the nozzles cannot be directly observed after the upper half of the product is installed. At this time, an inspection pin is inserted into the oblique hole of the upper half of the product, and the markings on the inspection pin are used to determine whether the nozzles have fallen off.

[0037] The specific assembly process of this device is as follows:

[0038] Place the base 6 on a platform, install the graphite ring 5 inside the base 6, and install the support rods 3 one by one into the inner holes of the base 6. Connect the support rods 3 and the graphite pad 2 with pins 1, where the support rods 3 and the inner holes of the base 6 are clearance fit. Slide the lower half of the product onto the support rods 3 from top to bottom until it reaches the stepped hole of the graphite ring 5, and then install the product nozzle onto the graphite pad 2. Control the height of the support rods 3 to meet the assembly height difference requirements between the lower half of the product and the product nozzle. Use the calibration template 7 to check the installation position of each nozzle to ensure that the upper hole of the upper half of the product is coaxial with the nozzle after installation. After inspection, after installing the upper half of the product, insert the inspection pin 8 into the inclined hole of the upper half of the product, and use the different markings on the inspection pin 8 to determine whether the nozzle has fallen off. The product is then brazed. The six support blocks evenly distributed on the bottom surface of the base 6, the eight 20mm diameter vent holes evenly distributed on the side wall, and the two 5mm diameter vent holes on the support rod 3 all ensure that the product is heated evenly during the brazing process, thus improving the quality of the weld.

[0039] Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make possible changes and modifications to the technical solutions of the present invention by utilizing the methods and techniques disclosed above without departing from the spirit and scope of the present invention. Therefore, any simple modifications, equivalent changes and alterations 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 protection scope of the technical solutions of the present invention.

Claims

1. A liquid rocket engine gas generator bottom component assembly device, characterized in that: The external gas generator includes a pin (1), a graphite pad (2), a support rod (3), a lifting shaft (4), a graphite ring (5), a base (6), and an inspection pin (8); the external gas generator includes a lower half, a nozzle, and an upper half; the base (6) is placed horizontally; the lifting shaft (4) is symmetrically arranged on the side wall of the base (6); the graphite ring (5) is placed on the circumference of the upper surface of the base plate of the base (6); the lower half of the external gas generator is placed on the graphite ring (5); the base plate of the base (6) is evenly provided with through holes; one support rod (3) is inserted above each through hole; one graphite pad (2) is installed on the top of each support rod (3); each support rod (3) One corresponding pin (1); holes are provided at the center of the support rod (3) and the graphite pad (2); the pin (1) extends into the through holes of the graphite pad (2) and the support rod (3) from top to bottom; one external gas generator nozzle is installed on the top of each graphite pad (2); the external gas generator nozzle is coaxially installed with the support rod (3); the upper part of the external gas generator is installed on the top of the lower part of the external gas generator; the inner wall of the upper part of the external gas generator is provided with inclined through holes, and each inclined through hole is connected to the top of the external gas generator nozzle; the inspection pin (8) is installed in the inclined through hole to realize the inspection of the position of the external gas generator nozzle.

2. The liquid rocket engine gas generator bottom assembly device according to claim 1, characterized in that: By placing a graphite pad (2) between the external gas generator nozzle and the support rod (3), the external gas generator nozzle and the support rod (3) are prevented from sticking together during the brazing process.

3. The liquid rocket engine gas generator bottom assembly device according to claim 2, characterized in that: The diameter of the graphite pad (2) is larger than the diameter of the support rod (3) to prevent the support rod (3) from sticking to the inner hole of the lower half of the external gas generator nozzle during the brazing process.

4. The liquid rocket engine gas generator bottom assembly device according to claim 1, characterized in that: The support rod (3) has two vent holes; the diameter of the vent holes is 5mm, which enables venting during the brazing process.

5. The liquid rocket engine gas generator bottom assembly device according to claim 1, characterized in that: By placing a graphite ring (5) between the lower half of the external gas generator and the base (6), the lower half of the external gas generator and the base (6) are prevented from sticking together during the brazing process.

6. The liquid rocket engine gas generator bottom assembly device according to claim 1, characterized in that: The base (6) is made of stainless steel 1Cr18Ni9Ti; the bottom of the lower half of the external gas generator is provided with through holes, and the through holes are distributed in the same way as the through holes of the base (6).

7. The liquid rocket engine gas generator bottom assembly device according to claim 6, characterized in that: Six support blocks are evenly distributed on the outer side of the bottom surface of the base (6) so that the heated gas can enter through the through hole of the base (6) during the brazing process and achieve uniform heating; six reinforcing ribs are evenly distributed on the inner side wall of the base (6) to prevent the base (6) from deforming during the brazing process.

8. The liquid rocket engine gas generator bottom assembly device according to claim 1, characterized in that: The support rod (3) and the through hole on the base (6) are clearance fit.

9. The liquid rocket engine gas generator bottom assembly device according to claim 1, characterized in that: The assembly device also includes a calibration template (7); the calibration template (7) is provided with through holes that are consistent with the distribution of the external gas generator nozzles; after the external gas generator nozzles are installed on the graphite pad (2), the calibration template (7) is installed from the top of the external gas generator nozzles downwards, so that the external gas generator nozzles pass through the holes on the calibration template (7) so that the external gas generator nozzles are in a vertically upward state.

10. The liquid rocket engine gas generator bottom assembly device according to claim 1, characterized in that: The inspection pin (8) has six engraved lines. The inspection pin (8) is inserted through the oblique hole in the upper part of the external gas generator. The position of the engraved lines determines whether the product nozzle is in the correct position.

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