CN-116985452-B - Manufacturing method of ultralow-temperature high-bearing bidirectional sealing device

CN116985452BCN 116985452 BCN116985452 BCN 116985452BCN-116985452-B

Abstract

The invention provides a manufacturing method of an ultralow-temperature high-bearing bidirectional sealing device, which comprises the steps of supporting a plastic ring by using a mandrel tool, mounting a spring piece on an outer molded surface of the plastic ring, clamping the spring piece by using a clamping pot, sleeving the spring piece on the outer molded surface of the spring piece in a pressing mode, limiting the spring piece and a pressing sleeve by using a pressing machine, pressing the pressing sleeve component formed by the pressing sleeve, the spring piece and the plastic ring in a bidirectional pressing mode, measuring the distance between the end surface of the pressing sleeve component and the end surface of a sealing framework after pressure relief to meet set index requirements, clamping the bidirectional sealing device, rolling the outer edge and the inner edge of the rolling hole by using a hob, and conducting airtight screening test on the bidirectional sealing device by using a sealing screening tool. The invention effectively solves the technical problem of manufacturing the low-temperature sealing device of the liquid rocket engine, improves the assembly efficiency and the assembly quality of the sealing device, and ensures the sealing performance of the valve.

Inventors

WU LIANG
CHEN DA
LV YANJIE
HU PAN
YANG DEYONG
FENG JIAN
LI LIN

Assignees

西安航天发动机有限公司

Dates

Publication Date: 20260508
Application Date: 20230630

Claims (7)

1. The manufacturing method of the ultralow-temperature high-bearing bidirectional sealing device is characterized by comprising the following steps of: after the mandrel tool (5) is used for supporting the plastic ring (3), the spring piece (2) is arranged on the outer molded surface of the plastic ring (3); After the spring piece (2) is clamped by the clamping tank (6), the pressing sleeve (4) is arranged on the outer molded surface of the spring piece (2), and the spring piece (2) is pressed by a press machine to limit the position of the spring piece (2) and the pressing sleeve (4); The two-way pressing sleeve assembly is composed of a two-way pressing sleeve (4), a spring piece (2) and a plastic ring (3), and the distance between the end face of the pressing sleeve assembly and the end face of the sealing framework (1) is measured after pressure relief to meet the set index requirement; clamping the bidirectional sealing device (8) and adopting a hob to roll the outer edge and the inner hole to roll edges; adopting a sealing and screening tool to perform airtight screening test on the bidirectional sealing device (8); after the plastic ring (3) is supported by the mandrel tool (5), the spring piece (2) is arranged on the outer molded surface of the plastic ring (3), and the method comprises the following steps: Gradually sleeving the spring piece (2) on the outer molded surface of the plastic ring (3), and taking out the mandrel tool (5) from the plastic ring (3) after the spring piece (2) passes through the maximum interference position, so that the spring piece (2) is completely arranged on the outer molded surface of the plastic ring (3); the diameter of the clamping tank (6) is 0.1-0.3 mm larger than the outer circle size of the closed end of the spring piece (2); After clamping the spring piece (2) by using the clamping tank (6), the pressing sleeve (4) is arranged on the outer molded surface of the spring piece (2), and the method comprises the following steps: Adopt clamp jar (6) centre gripping spring leaf (2) solid fixed ring one end, make after the even shrink of spring leaf (2), make the shrink diameter of spring leaf (2) elastic membrane one end be less than press cover (4) hole diameter 0.01~0.03mm, then with press cover (4) dress on spring leaf (2) external surface, wait to press cover (4) after passing through drill way step hole (42), take out spring leaf (2) from clamp jar (6), with spring leaf (2) slowly impress in terminal surface groove (41) of pressing cover (2).
2. The method for manufacturing the ultralow-temperature high-bearing bidirectional sealing device is characterized in that the mandrel tool (5) is manufactured according to the size of the inner surface of the plastic ring (3), the end head of the mandrel tool (5) is guided in a transition mode to prevent the inner surface of the plastic ring (3) from being scratched during loading, and the size difference between the inner surface of the plastic ring (3) and the matching conical surface of the mandrel tool (5) and the size difference between the inner surface of the mandrel tool (5) and the cylindricity surface of the mandrel tool (5) are 0.02-0.05 mm.
3. The method for manufacturing the ultralow-temperature high-bearing bidirectional sealing device according to claim 1, wherein the step of pressing the spring piece (2) by using the press to limit the spring piece (2) and the pressing sleeve (4) comprises the following steps: The end face of the spring piece (2) is pressed by a press machine, the end face of the spring piece (2) is enabled to be flush with the end face of the pressing sleeve (4), whether one end of the elastic diaphragm of the spring piece (2) and the plastic ring (3) are completely installed in an end face groove (41) of the pressing sleeve (4) or not is checked, and no scratch and no pressing damage are caused to an inner hole of the plastic ring (3).
4. The method for manufacturing the ultralow-temperature high-bearing bidirectional sealing device according to claim 1, wherein the method is characterized in that before a pressing sleeve assembly formed by the bidirectional pressing sleeve (4), the spring piece (2) and the plastic ring (3), the method comprises the following steps: According to the outer circle diameter of the pressing sleeve (4), a pressing tool (7) with the diameter smaller than 0.2-0.3 mm of the outer circle diameter of the pressing sleeve (4) is selected, one side pressing sleeve component is pressed into the sealing framework (1) by a press, and the other side pressing sleeve component is installed into the sealing framework (1).
5. The method for manufacturing the ultralow-temperature high-bearing bidirectional sealing device according to claim 1, wherein the clamping the bidirectional sealing device (8) adopts hob rolling outer edge and inner hole rolling edge comprises the following steps: the outer surface of the sealing framework (1) is rolled by adopting a 45-degree hob, the outer circle of the side wall of the sealing framework (1) is tightly attached to the pressing sleeve (4) after being rolled by 45 degrees, and the inner hole is rolled by adopting an R-type hob after the edge rolling of the two ends of the sealing framework (1) is finished.
6. The manufacturing method of the ultralow-temperature high-bearing bidirectional sealing device is characterized in that the sealing screening tool comprises an inlet connector (9), an outlet connector (10), a sealing gasket (11) and a mandrel (12), two ends of the mandrel (12) are respectively grooved to realize gas circulation, the mandrel (12) is arranged in an inner cavity of the bidirectional sealing device (8), the bidirectional sealing device (8) is arranged in a cavity formed by butt joint of the inlet connector (9) and the outlet connector (10), and the end faces of the inlet connector (9) and the outlet connector (10) clamp an annular bulge structure of the outer wall of a sealing framework (1) and are sealed by the sealing gasket (11).
7. The method for manufacturing the ultralow-temperature high-bearing bidirectional sealing device according to claim 1, wherein the method for performing the airtight screening test on the bidirectional sealing device (8) by adopting a sealing screening tool comprises the following steps: Installing the bidirectional sealing device (8) into a sealing and screening tool, introducing compressed air of 0.9MPa and 14.5MPa from an inlet connector (9), checking the radial tightness of the plastic ring (3) and the mandrel (12), checking the air tightness for 3min, and checking the plastic ring to be qualified if the leakage quantity meets 0 bubble/3 min.

Description

Manufacturing method of ultralow-temperature high-bearing bidirectional sealing device Technical Field The invention belongs to the technical field of manufacturing of liquid rocket engines, and mainly relates to a manufacturing method of a liquid rocket engine sealing device. Background A large number of low-temperature dynamic sealing parts exist in a valve of a liquid rocket engine control supply pipeline, and the problems of leakage easily caused by insufficient low-temperature compensation exist by adopting a conventional sealing structure for general dynamic sealing, filling sealing, metal thin-wall sealing and the like. According to the sealing device (shown in figure 1) designed in the invention of the ultralow temperature high bearing bidirectional sealing device (CN 110925434A), the sealing device comprises a sealing framework 1, a spring piece 2, a plastic ring 3 and a pressing sleeve 4, and a manufacturing method of the ultralow temperature high bearing bidirectional sealing device is provided. Disclosure of Invention The invention solves the technical problems that the manufacturing method of the ultralow-temperature high-bearing bidirectional sealing device solves the technical problems of manufacturing a nonmetal-metal sealing device with large excess, effectively avoids the problems of plastic ring damage, abnormal deformation of a spring piece, poor sealing performance after assembly and the like in the assembly process, effectively improves the assembly quality and the assembly efficiency of the sealing device, and improves the sealing performance of the sealing device. The technical scheme of the invention is that the manufacturing method of the ultralow-temperature high-bearing bidirectional sealing device comprises the following steps: after supporting the plastic ring by using a mandrel tool, mounting the spring piece on the outer molded surface of the plastic ring; pressing the spring piece by using a press machine to limit the spring piece and the pressing sleeve; the pressure sleeve assembly is formed by two-way pressure sleeve, spring piece and plastic ring, and the distance between the end face of the pressure sleeve assembly and the end face of the sealing framework is measured after pressure relief to meet the set index requirement; clamping the bidirectional sealing device, and rolling the outer edge and the inner edge of the hob; and (3) adopting a sealing screening tool to perform airtight screening test on the bidirectional sealing device. Further, the mandrel tool is manufactured according to the size of the inner surface of the plastic ring, the end head of the mandrel tool is guided in a transition mode to prevent the inner surface of the plastic ring from being scratched during loading, and the size difference between the inner surface of the plastic ring and the conical surface matched with the mandrel tool and the size difference between the inner surface of the plastic ring and the cylindricity surface of the mandrel tool are 0.02-0.05 mm. Further, after the plastic ring is supported by the mandrel tool, the spring piece is arranged on the outer molded surface of the plastic ring, and the method comprises the following steps: And gradually sleeving the spring piece on the outer molded surface of the plastic ring, and taking out the mandrel tool from the plastic ring after the spring piece passes through the maximum interference position, so that the spring piece is completely arranged on the outer molded surface of the plastic ring. Further, the diameter of the clamping tank is 0.1-0.3 mm larger than the outer circle size of the closed end of the spring piece. Further, after the use of the clamping and canning clamp spring piece, the clamping and canning clamp spring piece is sleeved on the outer molded surface of the spring piece in a pressing mode, and the clamping and canning clamp spring piece comprises: The fixed ring one end of the spring leaf is clamped by the clamping pot, after the spring leaf is uniformly contracted, the contracted diameter of one end of the elastic membrane of the spring leaf is smaller than the diameter of the inner hole of the pressing sleeve by 0.01-0.03 mm, the pressing sleeve is pressed on the outer molded surface of the spring leaf, after the pressing sleeve passes through the orifice step hole, the spring leaf is taken out from the clamping pot, and then the spring leaf is slowly pressed into the end face groove of the pressing sleeve. Further, use press suppression spring leaf to make spring leaf and pressure cover spacing, include: The end face of the spring piece is pressed by a press machine, the end face of the spring piece is enabled to be level with the end face of the pressing sleeve, whether one end of the elastic diaphragm of the spring piece and the plastic ring are completely arranged in a groove of the end face of the pressing sleeve or not is checked, and the inner hole of the plastic ring is checked to be free from scr