Expansion installation method for fluorine four-pad of liquid rocket engine

Abstract

An expansion mounting method for a liquid rocket engine fluorine four-pad comprises the steps that a first mounting sleeve, a second mounting sleeve and a closing sleeve are prepared, the fluorine four-pad on the outer side and the fluorine four-pad on the inner side are mounted through the first mounting sleeve and the second mounting sleeve correspondingly, and after mounting, the fluorine four-pad is shrunk and pressed to fall into a sealing groove; an expansion installation method replaces an original mode of shearing a fluorine four-pad installation, and the phenomena that the fluorine four-pad deforms, twists, slides out and the like in a sealing groove in the pressing process are avoided. The requirement for skills of personnel is lowered, the process stability is improved, and the product quality is guaranteed.

Description

Technical Field

[0001] The present invention relates to a method for expanding and installing a fluorine tetra gasket of a liquid rocket engine, belonging to the field of liquid rocket engine manufacturing. Background Art

[0002] As a kind of seal when used for radial sealing, the fluorine tetra gasket is currently widely used in China, but its installation method has been relatively fixed. Generally, methods such as direct sleeving and installing after shearing are used. The conventional installation methods are okay for general industrial use. However, the working environment of liquid rocket engines is harsh and the reliability requirements for products are extremely high. Therefore, the conventional installation methods can no longer meet the requirements during the assembly process of liquid rocket engines. Summary of the Invention

[0003] The technical problem solved by the present invention is: aiming at the problem of insufficient installation means when installing a fluorine tetra gasket in a radial sealing structure form in the current existing technology, a method for expanding and installing a fluorine tetra gasket of a liquid rocket engine is proposed.

[0004] The present invention solves the above technical problem through the following technical solutions:

[0005] A method for expanding and installing a fluorine tetra gasket of a liquid rocket engine includes:

[0006] Prepare a first installation sleeve, a second installation sleeve, and a closing sleeve;

[0007] Sheathe the fluorine tetra gaskets to be installed on the inner sides of the expansion sections of the first installation sleeve and the second installation sleeve respectively;

[0008] Heat-expand the fluorine tetra gasket on the first installation sleeve. After the heat expansion is completed, sheathe the first installation sleeve on the outside of the radial sealing product of the liquid rocket engine;

[0009] Push the first installation sleeve upward along the radial sealing product until the port of the first installation sleeve is flush with the position of the first sealing groove at the top of the radial sealing product and the fluorine tetra gasket is pushed to the flush position of the first sealing groove;

[0010] Remove the first installation sleeve, and sheathe the closing sleeve on the outside of the fluorine tetra gasket installation position. When the port of the closing sleeve is flush with the fluorine tetra gasket installation position, press the fluorine tetra gasket through the closing sleeve. After the fluorine tetra gasket shrinks, it falls into the first sealing groove;

[0011] Remove the closing sleeve, heat-expand the fluorine tetra gasket on the second installation sleeve. After the heat expansion is completed, sheathe the second installation sleeve on the outside of the radial sealing product of the liquid rocket engine;

[0012] Push the second installation sleeve upward along the radially sealed product until the port of the second installation sleeve is flush with the position of the second sealing groove at the top of the radially sealed product and the fluorine tetra gasket is pushed to the flush position of the second sealing groove;

[0013] Remove the second installation sleeve, and fit a closing sleeve outside the installation position of the fluorine tetra gasket. When the port of the closing sleeve is flush with the installation position of the fluorine tetra gasket, push the fluorine tetra gasket through the closing sleeve. After the fluorine tetra gasket shrinks, it falls into the second sealing groove. Remove the closing sleeve to complete the expansion installation of the fluorine tetra gasket.

[0014] The number of fluorine tetra gaskets to be installed is two, and the installation positions are respectively in the first sealing groove and the second sealing groove. The first sealing groove and the second sealing groove are arranged on the outer top of the radially sealed product. The position of the first sealing groove is higher than that of the second sealing groove. During installation, install the fluorine tetra gasket corresponding to the first sealing groove first and then the fluorine tetra gasket corresponding to the second sealing groove.

[0015] Both the first installation sleeve and the second installation sleeve are prepared according to a tapered expansion section and a straight barrel section. The tapered expansion section is provided with a heating device for heating the fluorine tetra gasket to be installed; the length of the straight barrel section of the second installation sleeve is less than that of the first installation sleeve.

[0016] All parts and corners of the first installation sleeve, the second installation sleeve, and the fluorine tetra gasket are chamfered to avoid scratching the radially sealed product; the inner cavity depth of the first installation sleeve and the second installation sleeve is greater than the length of the radially sealed product, and the inner diameter of the first installation sleeve and the second installation sleeve is greater than the outer diameter of the radially sealed product.

[0017] The heating and expansion time of the fluorine tetra gasket is controlled within a preset range to prevent excessive expansion; the heating and expansion time is set according to the pressing ability of the closing sleeve.

[0018] The closing sleeve is set as a two-section through-hole structure with openings. The inner diameter of the closing sleeve is greater than the outer diameter of the radially sealed product; the differences between the inner cavity depths of the first installation sleeve and the second installation sleeve, the inner diameters of the first installation sleeve and the second installation sleeve, and the corresponding parameters of the inner diameter of the closing sleeve and the radially sealed product are all within the preset range to prevent excessive expansion or failure of the fluorine tetra gasket to be sleeved.

[0019] An inclined angle is provided at the top edge of the closing sleeve for pressing the fluorine tetra gasket sleeved into the preset installation position after heating and expansion. After the pressing treatment, the fluorine tetra gaskets are respectively fixed in the corresponding sealing groove positions.

[0020] The materials used for manufacturing the first sleeve, the second sleeve, and the closing sleeve have a hardness lower than that of the materials of the liquid rocket engine radially sealed product to prevent knocking damage to the liquid rocket engine radially sealed product.

[0021] The surface roughness of the first sleeve, the second sleeve, and the necking sleeve should be as smooth as possible to ensure a stable installation process and avoid scratching the fluorine tetra gasket at the same time.

[0022] The spacing, depth, and the mating dimensions with the fluorine tetra gasket of the two sealing grooves of the liquid rocket engine radial seal product are determined according to the specific application requirements of the liquid rocket engine radial seal product.

[0023] The advantages of the present invention compared with the prior art are as follows:

[0024] An expansion installation method for the fluorine tetra gasket of a liquid rocket engine provided by the present invention realizes the installation of the fluorine tetra gasket in the form of a liquid rocket engine radial seal through a fluorine tetra gasket installation device. After adopting this invention patent, when installing the fluorine tetra gasket, phenomena such as deformation, distortion, and slipping out of the fluorine tetra gasket in the sealing groove during the pressing process can be avoided. It reduces the requirements for personnel skills, improves process stability, and ensures product quality. Brief Description of the Drawings

[0025] Figure 1 Schematic diagrams of the first installation sleeve and the second installation sleeve provided for the invention;

[0026] Figure 2 Schematic diagram of the necking sleeve provided for the invention;

[0027] Figure 3 Schematic diagram of the usage process of the fluorine tetra gasket installation device provided for the invention. Detailed Embodiments

[0028] An expansion installation method for the fluorine tetra gasket of a liquid rocket engine, prepare the first installation sleeve, the second installation sleeve, and the necking sleeve. Install the outer fluorine tetra gasket and the inner fluorine tetra gasket through the first installation sleeve and the second installation sleeve respectively. After installation, shrink and press the fluorine tetra gasket to make it fall into the sealing groove. The expansion installation method replaces the original method of installing the fluorine tetra gasket by shearing, and avoids phenomena such as deformation, distortion, and slipping out of the fluorine tetra gasket in the sealing groove during the pressing process. It reduces the requirements for personnel skills, improves process stability, and ensures product quality.

[0029] The expansion installation method for the fluorine tetra gasket of a liquid rocket engine is as follows:

[0030] Prepare the first installation sleeve, the second installation sleeve, and the necking sleeve;

[0031] Sheathe the fluorine tetra gaskets to be installed on the inner sides of the expansion sections of the first installation sleeve and the second installation sleeve respectively;

[0032] Heat-expand the fluorine tetra gasket of the first installation sleeve. After the heat expansion is completed, set the first installation sleeve on the outside of the radial seal product of the liquid rocket engine.

[0033] Push the first installation sleeve upward along the radial seal product until the port of the first installation sleeve is flush with the position of the first seal groove at the top of the radial seal product and the fluorine tetra gasket is pushed to the flush position of the first seal groove.

[0034] Remove the first installation sleeve. Set the closing sleeve on the outside of the installation position of the fluorine tetra gasket. When the port of the closing sleeve is flush with the installation position of the fluorine tetra gasket, press the fluorine tetra gasket through the closing sleeve. After the fluorine tetra gasket shrinks, it falls into the first seal groove.

[0035] Remove the closing sleeve. Heat-expand the fluorine tetra gasket of the second installation sleeve. After the heat expansion is completed, set the second installation sleeve on the outside of the radial seal product of the liquid rocket engine.

[0036] Push the second installation sleeve upward along the radial seal product until the port of the second installation sleeve is flush with the position of the second seal groove at the top of the radial seal product and the fluorine tetra gasket is pushed to the flush position of the second seal groove.

[0037] Remove the second installation sleeve. Set the closing sleeve on the outside of the installation position of the fluorine tetra gasket. When the port of the closing sleeve is flush with the installation position of the fluorine tetra gasket, press the fluorine tetra gasket through the closing sleeve. After the fluorine tetra gasket shrinks, it falls into the second seal groove. Remove the closing sleeve to complete the expansion and installation of the fluorine tetra gasket.

[0038] The number of fluorine tetra gaskets to be installed is two, and the installation positions are in the first seal groove and the second seal groove respectively. The first seal groove and the second seal groove are arranged on the outside top of the radial seal product. The position of the first seal groove is higher than that of the second seal groove. During installation, install the fluorine tetra gasket corresponding to the first seal groove first and then the fluorine tetra gasket corresponding to the second seal groove.

[0039] Both the first installation sleeve and the second installation sleeve are prepared according to the taper expansion section and the straight cylinder section. The taper expansion section is provided with a heating device for heating the fluorine tetra gasket to be installed. The length of the straight cylinder section of the second installation sleeve is less than that of the first installation sleeve.

[0040] Round off the edges and corners of all parts of the first installation sleeve, the second installation sleeve and the fluorine tetra gasket to avoid scratching the radial seal product. The inner cavity depth of the first installation sleeve and the second installation sleeve is greater than the length of the radial seal product, and the inner diameter of the first installation sleeve and the second installation sleeve is greater than the outer diameter of the radial seal product.

[0041] The heat expansion time of the fluorine tetra gasket is controlled within a preset range to prevent excessive expansion. The heat expansion time is set according to the pressing ability of the closing sleeve.

[0042] The closing sleeve is set as a through-hole structure with two sections of openings, and the inner diameter of the closing sleeve is larger than the outer diameter of the radial sealing product; the difference between the inner cavity depths of the first installation sleeve and the second installation sleeve, the inner diameters of the first installation sleeve and the second installation sleeve, and the corresponding parameters of the inner diameter of the closing sleeve and the radial sealing product are all within a preset range to prevent excessive expansion or failure of the fluorine four gasket set.

[0043] An inclined angle is provided at the top edge of the closing sleeve for pressing the fluorine four gasket that is sleeved into the preset installation position after heating expansion, and the fluorine four gaskets after pressing are respectively fixed in the corresponding sealing groove positions.

[0044] The following is further described in conjunction with the accompanying drawings of the specification and the preferred embodiments:

[0045] In the current embodiment, the fluorine four gasket installation device is composed of a first installation sleeve, a second installation sleeve and a closing sleeve. One end of the first installation sleeve is a tapered expansion section structure for heating and expanding the fluorine four gasket, and the other end is a straight section structure for guiding the installation process of the fluorine four gasket. The function of the second installation sleeve is roughly the same as that of the first installation sleeve. Different from the first installation sleeve, the length of the second installation sleeve is shorter and is used to install the outer fluorine four gasket, while the first installation sleeve is used to install the inner fluorine four gasket. One end of the closing sleeve is a structure with an expansion section, which is used to shrink and press the fluorine four gasket after installation so that it falls into the sealing groove.

[0046] Considering that the fluorine four gasket needs to be expanded first and then contracted, tapered expansion sections are designed at one end of both the first installation sleeve and the second installation sleeve for heating and expanding the fluorine four gasket;

[0047] Considering that there are two places in the radial sealing groove where the fluorine four gasket needs to be installed, two installation sleeves with different lengths are designed, and the fluorine four gaskets are installed in sequence according to the principle of inside first and then outside;

[0048] Considering that the product for installing the fluorine four gasket may be made of aluminum alloy or other materials, to avoid damage to the product and the fluorine four gasket, all the corners of the parts of the fluorine four gasket installation device are rounded;

[0049] Considering that the first installation sleeve and the second installation sleeve need to be sleeved on the product with a radial sealing groove, the inner cavity depth of the first installation sleeve and the second installation sleeve should be greater than the length of the product, and the inner diameters of the first installation sleeve and the second installation sleeve should be slightly larger than the outer diameter of the product, but not too large. So that the installation sleeve can be smoothly sleeved on the product and the fluorine four gasket is not over-expanded;

[0050] Considering that the closing sleeve needs to be sleeved on the product with a radial sealing groove, the closing sleeve should be a through-hole structure, and the inner diameter of the closing sleeve should be slightly larger than the outer diameter of the product, but not too large. So that the closing sleeve can be smoothly sleeved on the product and ensure that the fluorine four gasket can contract to the greatest extent.

[0051] Example 1:

[0052] Step 1: Place the fluorine tetra gasket to be installed on the expansion section of the first installation sleeve, and use tools such as a hair dryer to heat the fluorine tetra gasket. After heating to a certain degree, push the fluorine tetra gasket to the cylindrical section of the installation sleeve;

[0053] Step 2: Slip the installation sleeve onto the radial sealing product. The port of the cylindrical section of the installation sleeve is flush with the inner sealing groove of the fluorine tetra gasket to be installed, and then push the fluorine tetra gasket into the sealing groove;

[0054] Step 3: Remove the first installation sleeve, slip the closing sleeve onto the installation position of the fluorine tetra gasket, and push it upward to make the fluorine tetra gasket contract and fall into the sealing groove;

[0055] Step 4: Remove the closing sleeve, repeat the above steps using the second installation sleeve to install the outer fluorine tetra gasket, and then install the corresponding product.

[0056] Although the present invention has been disclosed above with 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 solution of the present invention using the methods and technical contents disclosed above without departing from the spirit and scope of the present invention. Therefore, any simple modification, equivalent change, and modification made to the above embodiments based on the technical essence of the present invention without departing from the technical solution of the present invention shall fall within the protection scope of the technical solution of the present invention.

[0057] The content not detailedly described in the specification of the present invention belongs to the well-known technology of those skilled in the art.

Claims

1. A method for expanding and installing a fluorine-free gasket for a liquid rocket engine, characterized in that include: Prepare a first installation sleeve, a second installation sleeve, and a closing sleeve; Put the fluorine four-gasket to be installed on the inner side of the expansion section of the first installation sleeve and the second installation sleeve respectively; The fluorine-four gasket of the first installation sleeve is heated and expanded, and after the heating and expansion is completed, the first installation sleeve is sleeved on the outer side of the radial sealing product of the liquid rocket engine; Push the first installation sleeve upward along the radial sealing product until the port of the first installation sleeve is flush with the first sealing groove at the top of the radial sealing product and the fluorine-free gasket is pushed to the flush position of the first sealing groove; Remove the first installation sleeve, and install a closing sleeve on the outside of the installation position of the fluorine four-gasket. When the end of the closing sleeve is flush with the installation position of the fluorine four-gasket, push the fluorine four-gasket through the closing sleeve, and the fluorine four-gasket shrinks and falls into the first sealing groove; The closing sleeve is removed, and the fluorine-four pad of the second installation sleeve is heated and expanded. After the heating and expansion is completed, the second installation sleeve is sleeved on the outer side of the radial sealing product of the liquid rocket engine; Push the second installation sleeve upward along the radial sealing product until the port of the second installation sleeve is flush with the second sealing groove at the top of the radial sealing product and the fluorine-free gasket is pushed to the flush position of the second sealing groove; Remove the second installation sleeve and install the closing sleeve on the outside of the F4 pad installation position. When the closing sleeve port is flush with the F4 pad installation position, push the F4 pad through the closing sleeve. The F4 pad shrinks and falls into the second sealing groove. Remove the closing sleeve to complete the expansion installation of the F4 pad.

2. The expansion installation method of a liquid rocket engine fluorine-free gasket according to claim 1, characterized in that: There are two fluorocarbon pads to be installed, and the installation positions are in the first sealing groove and the second sealing groove respectively. The first sealing groove and the second sealing groove are arranged at the top of the outer side of the radial sealing product. The position of the first sealing groove is higher than the second sealing groove. During installation, first install the fluorocarbon pad corresponding to the first sealing groove and then install the fluorocarbon pad corresponding to the second sealing groove.

3. The expansion installation method of a liquid rocket engine fluorine-free gasket according to claim 1, characterized in that: The first installation sleeve and the second installation sleeve are both prepared according to a tapered expansion section and a straight section. The tapered expansion section is provided with a heating device for heating the fluorocarbon pad to be installed; the straight section of the second installation sleeve is shorter than that of the first installation sleeve.

4. The expansion installation method of a liquid rocket engine fluorine-free gasket according to claim 1, characterized in that: The corners of the first mounting sleeve, the second mounting sleeve and the fluorocarbon four-gasket are chamfered to avoid scratching the radial sealing product; the inner cavity depth of the first mounting sleeve and the second mounting sleeve is greater than the length of the radial sealing product, and the inner diameter of the first mounting sleeve and the second mounting sleeve is greater than the outer diameter of the radial sealing product.

5. The expansion installation method of a fluorine-free four-gasket for a liquid rocket engine according to claim 1, characterized in that: The heating expansion time of the fluorine-4 pad is controlled within a preset range to prevent excessive expansion; the heating expansion time is set according to the compression capacity of the closing sleeve.

6. The expansion installation method of a liquid rocket engine fluorine-free gasket according to claim 4, characterized in that: The closing sleeve is arranged as a through-hole structure with two openings, and the inner diameter of the closing sleeve is larger than the outer diameter of the radial sealing product; the inner cavity depth of the first mounting sleeve and the second mounting sleeve, the inner diameter of the first mounting sleeve and the second mounting sleeve, and the difference between the inner diameter of the closing sleeve and the corresponding parameters of the radial sealing product are all within a preset range to prevent excessive expansion or failure of the fluoro-four-gasket set.

7. The expansion installation method of a fluorine-free gasket for a liquid rocket engine according to claim 6, characterized in that: The top edge of the closing sleeve is provided with an oblique angle for pressing the fluorocarbon pad which is inserted into a preset installation position after heating and expansion. The pressed fluorocarbon pads are respectively fixed in the corresponding sealing groove positions.

8. The expansion installation method of a fluorine-free four-gasket for a liquid rocket engine according to claim 4, characterized in that: The hardness of the material used to manufacture the first sleeve, the second sleeve, and the closing sleeve must be lower than the hardness of the material of the liquid rocket engine radial sealing product to prevent bumps and scratches on the liquid rocket engine radial sealing product.

9. The expansion installation method of a liquid rocket engine fluorine-free gasket according to claim 8, characterized in that: The surface roughness of the first sleeve, the second sleeve and the closing sleeve should be as smooth as possible to ensure a smooth installation process and avoid scratching the F-4 gasket.

10. The expansion installation method of a liquid rocket engine fluorine-free gasket according to claim 2, characterized in that: The spacing and depth of the two sealing grooves of the liquid rocket engine radial sealing product and the matching dimensions with the F-4 pad are determined according to the requirements of the specific application scenarios in which the liquid rocket engine radial sealing product is used.

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