High-temperature-resistant heat-insulating fiber felt connecting structure and manufacturing method thereof

Abstract

A kind of high-temperature-resistant heat-insulating fiber felt connecting structure, heat-insulating layer body includes left piece and right piece, the upper end of the left piece is equipped with the upper sewing piece of integral structure, the lower end of the right piece is equipped with the lower sewing piece of integral structure, the upper sewing piece is sewn with lower sewing piece by sewing structure and point glue structure and is equipped with on the heat-insulating layer body, the integral structure;The sewing structure includes: first sewing edge, second sewing edge and third sewing edge, the first sewing edge, second sewing edge are both double-thread needle method sewing, the third sewing edge double-thread needle method sewing is sewn back, the needle hole of the first sewing edge, second sewing edge and third sewing edge is filled with point glue structure.In sewing, first sew middle positioning, then sew two sides.The design not only interface smooth, good integrity, seam efficiency approaches 100%, significantly improves the overall mechanical properties of large, heterotypic size fiber felt, and needle hole is carried out point glue treatment to avoid heat transfer through needle hole, improve mechanical properties.

Description

Technical Field

[0001] This invention relates to a high-temperature resistant heat-insulating fiber felt connection structure and its manufacturing method, and is specifically applicable to the field of high-temperature resistant heat-insulating layer connection manufacturing. Background Technology

[0002] Inorganic fiber felt material has good high-temperature insulation performance, good thermal shock resistance, is not prone to creep at high temperatures, and has good chemical stability and is not easily corroded. It is a high-quality high-temperature insulation material and is widely used in aerospace vehicle cabins and engine nozzles, large high-temperature furnaces, steelmaking kilns, heating pipes, and oil pipelines.

[0003] However, high-temperature resistant and heat-insulating inorganic fiber felt materials are thick, and when applied to large heat insulation devices, they usually need to be designed into cylindrical, conical, or other irregularly shaped structures. This inevitably leads to problems with interlayer (thickness direction) connections and open connections (splicing). How to handle these connection problems will affect the overall structure and performance. Patent CN201811409204.5 discloses a ring-shaped high-silica heat insulation layer for the rear casing skin of an irregularly shaped engine and its heat insulation method. It uses high-silica needle-punched felt, high-silica cloth, connecting cloth, and high-silica fiber sewing thread to perform interlayer connections and stitching in a ring shape to protect the irregularly shaped engine rear casing. Patent CN 111716862A discloses a needle-punched + shallow-stitched three-dimensional prefabricated part and its preparation method. It alternately lays planar fabric and fiber felt, and gradually increases the thickness by alternating needle punching and shallow stitching in the interlayer thickness direction, solving the interlayer connection problem of high-thickness prefabricated parts. Patent CN210858604 U discloses an aerogel felt insulation tape for oilfield insulated oil pipes, which uses a fixing rope to bind and connect multiple layers of insulation materials.

[0004] Most existing patented technologies currently use interlayer stitching or adhesive bonding to connect the thermal insulation fiber felt and the fabric, but the problem of connecting the openings in the thermal insulation fiber felt has not yet been solved.

[0005] 1. Thermal insulation fiber felt is usually thick. If a reasonable cut structure design is not adopted, it will cause serious bulging problems, affecting the performance and aesthetics of the material. Secondly, how the joints of the thermal insulation fiber felt are connected and how the stitching structure is designed will directly affect the joint strength, performance and service life of the material.

[0006] 2. In the existing connection method, after the fiber felt is installed, it needs to be moved and processed. During this process, the fiber felt is subjected to friction and pulling, and the joints with low tensile strength are often damaged or broken, resulting in the fiber felt not meeting the heat insulation effect or needing to be removed and re-insulated.

[0007] 3. When the thermal insulation fiber felt is working in an environment exceeding 1000℃, the mechanical properties of the material will decrease drastically, which may cause the thermal insulation layer to break at the seams, resulting in thermal insulation failure. Summary of the Invention

[0008] The purpose of this invention is to address the manufacturing problem of open connections in high-temperature resistant heat-insulating fiber felt, and to overcome the problems of uneven seam joints, poor fiber felt seam strength, low seam efficiency, and large pinholes in existing technologies. This invention provides a high-temperature resistant heat-insulating fiber felt connection structure with smooth splicing and high seam efficiency, as well as its manufacturing method.

[0009] To achieve the above objectives, the technical solution of the present invention is:

[0010] A high-temperature resistant heat-insulating fiber felt connection structure includes: a heat-insulating layer body, wherein the heat-insulating layer body is a high-temperature resistant fiber felt, the heat-insulating layer body includes a left piece and a right piece, the upper end of the left piece is provided with an integral upper sewn piece, the lower end of the right piece is provided with an integral lower sewn piece, the upper sewn piece and the lower sewn piece are the same shape and size, the bottom surface of the upper sewn piece and the top surface of the lower sewn piece are attached to each other, the heat-insulating layer body is provided with a sewing structure and an adhesive dispensing structure, and the upper sewn piece on the left piece is sewn together with the lower sewn piece on the right piece by the sewing structure;

[0011] The suture structure includes a first suture edge, a second suture edge, and a third suture edge. The second suture edge is the joint between the upper suture piece and the right piece. The second suture edge is used to sew the upper suture piece to the right piece and the lower suture piece of the integral structure together using a double-thread stitch. The first suture edge is the joint between the lower suture piece and the left piece. The first suture edge is used to sew the lower suture piece to the left piece and the upper suture piece of the integral structure together using a double-thread stitch. The third suture edge is located at the central axis between the upper and lower suture pieces. The third suture edge is used to sew the upper and lower suture pieces together using a double-thread backstitch.

[0012] The needle holes of the first, second, and third seam edges are filled with adhesive dots.

[0013] The heat insulation layer body 1 has a high-temperature resistant fiber felt thickness of 5-20 mm, and the upper stitching piece 4 has a thickness of 1 / 3 to 2 / 3 of the original thickness of the high-temperature resistant fiber felt.

[0014] The first and second seam edges have the same structure. The seam spacing is b, which is 5 to 30 mm. The stitch length is a, which is 5 to 30 mm. The stitch length of the third seam edge 23 is c, which is 5 to 30 mm.

[0015] The high-temperature resistant fiber felt is one of the following: mullite fiber felt, quartz fiber felt, carbon fiber felt, alumina fiber felt, or silicon carbide fiber felt;

[0016] The sewing thread used in the stitching structure is one of quartz fiber sewing thread, alumina fiber sewing thread, carbon fiber sewing thread, or silicon carbide fiber sewing thread, and the thread fineness is 120-680 tex.

[0017] The high-temperature resistant fiber felt is one of mullite fiber felt or alumina fiber felt;

[0018] The sewing thread used in the stitching structure is either quartz fiber sewing thread or alumina fiber sewing thread, and the thread fineness is 120-680 tex.

[0019] A method for manufacturing a high-temperature resistant heat-insulating fiber felt connection structure, the method comprising the following steps:

[0020] S1. Cutting: Cut the high-temperature resistant fiber felt to the appropriate size according to the drawing, leaving a cutting allowance. Cut off the designed thickness from the ends of the cut high-temperature resistant fiber felt to form the upper and lower sewing pieces. At this point, the cutting is complete.

[0021] S2. Marking and positioning: Determine the suturing structure parameters of the first suture edge, the second suture edge, and the third suture edge. Align the upper suture piece and the lower suture piece with the suturing state and place them flat. Then, mark the pinhole positions of the first suture edge, the second suture edge, and the third suture edge on the left piece, the right piece, and the upper suture piece according to the suturing parameters.

[0022] S3. Suturing: First, position the sutures, then suture the edges. First, sew the upper and lower suture pieces together using double-stitch backstitching according to the suture points of the third suture edge. Then, sew the upper suture piece, lower suture piece, and right piece together using double-stitching according to the suture points of the second suture edge. Finally, sew the lower suture piece 5 together with the upper suture piece and left piece together using double-stitching according to the suture points of the first suture edge.

[0023] S4. Glue application: Mix the resin glue and solvent at a mass ratio of 1:0.5 to 10, stir well, and inject the mixed resin glue solution into the needle hole position of the sewn structure using a glue application device. Dry at 40 to 80°C for 1 to 12 hours to evaporate the solvent and solidify the resin glue to bond the sewing thread and surrounding fiber felt together, thus completing the manufacturing process.

[0024] In step S1, during the cutting process, an aluminum strip of appropriate specifications is selected based on the thickness of the high-temperature resistant fiber felt. The thickness of the aluminum strip is the design thickness of the upper sewing piece, and the length of the aluminum strip is greater than the cutting part at the end of the high-temperature resistant fiber felt. Then, the cutting part is marked with a marker pen. The fiber felt is placed between two aluminum strips, with the aluminum strips and the two sides of the fiber felt tightly attached. A thin blade is placed above the aluminum strip, and the blade cuts the fiber felt parallel to the length of the aluminum strip until it cuts below the marked line. Then, the blade is used to cut vertically downwards along the marked line until the blade touches the aluminum strip, at which point the cutting is complete.

[0025] In step S4, dispensing, the dispensing equipment needs to inject the compound resin adhesive solution into the needle hole from both sides.

[0026] The resin adhesive is one or more of silicone rubber resin and boron phenolic resin; the solvent of the resin adhesive is one or more of petroleum ether and anhydrous ethanol.

[0027] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0028] 1. The present invention provides a slit structure design in a high-temperature resistant heat-insulating fiber felt structure, which allows two fiber felts to overlap, with smooth interfaces and good overall integrity, thus solving the problem of protrusions in the connection structure of thick fiber felts.

[0029] 2. The first and second seam edges designed in the high-temperature resistant heat-insulating fiber felt structure of this invention effectively prevent fiber slippage at the fiber felt cut, improving stress transmission at the fiber felt cut. Furthermore, the third seam edge designed in this invention effectively prevents slippage between the two seam pieces, firmly connecting the two seam pieces together. The comprehensive design of the entire seam structure of this invention results in high seam strength of the high-temperature resistant fiber felt, with a seam efficiency approaching 100%. This is equivalent to the seam connection structure of the fiber felt having almost the same strength as the unsealed fiber felt, significantly improving the overall mechanical properties of large and irregularly shaped fiber felts, and expanding the application range and service life of the high-temperature resistant fiber felt.

[0030] 3. The cutting, positioning and sewing, edge sewing and glue application in the manufacturing method of the high temperature insulation layer structure of the present invention not only achieve high strength connection of thick fiber felt in a simple and effective way, but also the glue application can make up for the large pinholes caused by sewing, avoid heat transfer through the pinholes, and the glue enhances the bonding between the sewing thread and the fiber felt, further improving the strength of the sewn connection structure. Attached Figure Description

[0031] Figure 1 This is a side view of the suturing diagram of the present invention.

[0032] Figure 2 This is a top view of the stitching diagram of the present invention.

[0033] Figure 3 This is a top view of the stitching diagram of Comparative Example 1 of the present invention.

[0034] In the diagram: insulation layer body 1, left piece 11, right piece 12, stitching structure 2, first stitching edge 21, second stitching edge 22, third stitching edge 23, adhesive dotting structure 3, upper stitching piece 4, lower stitching piece 5. Detailed Implementation

[0035] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0036] See Figures 1 to 2 A high-temperature resistant heat-insulating fiber felt connection structure includes: a heat-insulating layer body 1, wherein the heat-insulating layer body 1 is a high-temperature resistant fiber felt, the heat-insulating layer body 1 includes a left piece 11 and a right piece 12, the upper end of the left piece 11 is provided with an integral upper sewn piece 4, the lower end of the right piece 12 is provided with an integral lower sewn piece 5, the upper sewn piece 4 and the lower sewn piece 5 have the same shape and size, the bottom surface of the upper sewn piece 4 is attached to the top surface of the lower sewn piece 5, the heat-insulating layer body 1 is provided with a sewing structure 2 and an adhesive dispensing structure 3, and the upper sewn piece 4 on the left piece 11 is sewn together with the lower sewn piece 5 on the right piece 12 through the sewing structure 2;

[0037] The suture structure 2 includes a first suture edge 21, a second suture edge 22, and a third suture edge 23. The second suture edge 22 is the joint between the upper suture piece 4 and the right piece 12. The second suture edge 22 sews the upper suture piece 4, the right piece 12, and the lower suture piece 5 of the integral structure together using a double-thread stitch. The first suture edge 21 is the joint between the lower suture piece 5 and the left piece 11. The first suture edge 21 sews the lower suture piece 5, the left piece 11, and the upper suture piece 4 of the integral structure together using a double-thread stitch. The third suture edge 23 is located at the central axis between the upper suture piece 4 and the lower suture piece 5. The third suture edge 23 sews the upper suture piece 4 and the lower suture piece 5 together using a double-thread backstitch.

[0038] The needle holes of the first suture edge 21, the second suture edge 22 and the third suture edge 23 are filled with adhesive dotting structure 3.

[0039] The heat insulation layer body 1 has a high-temperature resistant fiber felt thickness of 5-20 mm, and the upper stitching piece 4 has a thickness of 1 / 3 to 2 / 3 of the original thickness of the high-temperature resistant fiber felt.

[0040] The first seam edge 21 and the second seam edge 22 have the same structure. The seam spacing is b, which is 5 to 30 mm. The seam stitch length is a, which is 5 to 30 mm. The seam stitch length of the third seam edge 23 is c, which is 5 to 30 mm.

[0041] The high-temperature resistant fiber felt is one of the following: mullite fiber felt, quartz fiber felt, carbon fiber felt, alumina fiber felt, or silicon carbide fiber felt;

[0042] The sewing thread of the stitching structure 2 is one of quartz fiber sewing thread, alumina fiber sewing thread, carbon fiber sewing thread, or silicon carbide fiber sewing thread, and the fineness of the sewing thread is 120-680 tex.

[0043] A method for manufacturing a high-temperature resistant heat-insulating fiber felt connection structure, the method comprising the following steps:

[0044] S1. Cutting: Cut the high-temperature resistant fiber felt to the appropriate size according to the drawing, leaving a cutting allowance. Cut off the designed thickness from the ends of the cut high-temperature resistant fiber felt to form the upper sewing piece 4 and the lower sewing piece 5. At this point, the cutting is complete.

[0045] S2. Marking and positioning: Determine the suturing structure parameters of the first suture edge 21, the second suture edge 22 and the third suture edge 23. Align and flatten the upper suture piece 4 and the lower suture piece 5 according to the suturing state. Then mark the pinhole positions of the first suture edge 21, the second suture edge 22 and the third suture edge 23 on the left piece 11, the right piece 12 and the upper suture piece 4 according to the suturing parameters.

[0046] S3. Suturing: First, position the sutures, then suture the edges. First, sew the upper suture piece 4 and the lower suture piece 5 together using double-thread backstitching according to the suture points of the third suture edge 23. Then, sew the upper suture piece 4, the lower suture piece 5, and the right piece 12 together using double-thread stitching according to the suture points of the second suture edge 22. Finally, sew the lower suture piece 5, the upper suture piece 4, and the left piece 11 together using double-thread stitching according to the suture points of the first suture edge 21.

[0047] S4. Glue application: Mix the resin glue and solvent at a mass ratio of 1:0.5 to 10, stir well, and inject the mixed resin glue solution into the needle hole position of the sewn structure using a glue application device. Dry at 40 to 80°C for 1 to 12 hours to evaporate the solvent and solidify the resin glue to bond the sewing thread and surrounding fiber felt together, thus completing the manufacturing process.

[0048] In step S1, during the cutting process, an aluminum strip of appropriate specifications is selected based on the thickness of the high-temperature resistant fiber felt. The thickness of the aluminum strip is the design thickness of the upper sewing piece 4, and the length of the aluminum strip is greater than the cutting part at the end of the high-temperature resistant fiber felt. Then, the cutting part is marked with a marker pen. The fiber felt is placed between two aluminum strips, with the aluminum strips and the two sides of the fiber felt tightly attached. A thin blade is placed above the aluminum strip, and the blade cuts the fiber felt parallel to the length of the aluminum strip until it cuts below the marked line. Then, the blade is used to cut vertically downwards along the marked line until the blade touches the aluminum strip. At this point, the cutting is complete.

[0049] In step S4, dispensing, the dispensing equipment needs to inject the compound resin adhesive solution into the needle hole from both sides.

[0050] The resin adhesive is one or more of silicone rubber resin and boron phenolic resin; the solvent of the resin adhesive is one or more of petroleum ether and anhydrous ethanol.

[0051] The principle of this invention is explained as follows:

[0052] The high-temperature resistant heat-insulating fiber felt connection structure of this design carbonizes the adhesive structure 3 after the temperature exceeds 600℃. The carbonized adhesive can still seal the pinholes, maintain its heat insulation performance, and reduce heat transfer.

[0053] Example 1:

[0054] A high-temperature resistant heat-insulating fiber felt connection structure includes: a heat-insulating layer body 1, wherein the heat-insulating layer body 1 is a high-temperature resistant fiber felt, the heat-insulating layer body 1 includes a left piece 11 and a right piece 12, the upper end of the left piece 11 is provided with an integral upper sewn piece 4, the lower end of the right piece 12 is provided with an integral lower sewn piece 5, the upper sewn piece 4 and the lower sewn piece 5 have the same shape and size, the bottom surface of the upper sewn piece 4 is attached to the top surface of the lower sewn piece 5, the heat-insulating layer body 1 is provided with a sewing structure 2 and an adhesive dispensing structure 3, and the upper sewn piece 4 on the left piece 11 is sewn together with the lower sewn piece 5 on the right piece 12 through the sewing structure 2;

[0055] The suture structure 2 includes a first suture edge 21, a second suture edge 22, and a third suture edge 23. The second suture edge 22 is the joint between the upper suture piece 4 and the right piece 12. The second suture edge 22 sews the upper suture piece 4, the right piece 12, and the lower suture piece 5 of the integral structure together using a double-thread stitch. The first suture edge 21 is the joint between the lower suture piece 5 and the left piece 11. The first suture edge 21 sews the lower suture piece 5, the left piece 11, and the upper suture piece 4 of the integral structure together using a double-thread stitch. The third suture edge 23 is located at the central axis between the upper suture piece 4 and the lower suture piece 5. The third suture edge 23 sews the upper suture piece 4 and the lower suture piece 5 together using a double-thread backstitch.

[0056] The needle holes of the first suture edge 21, the second suture edge 22 and the third suture edge 23 are filled with adhesive dotting structure 3.

[0057] The heat insulation layer body 1 has a high-temperature resistant fiber felt thickness of 5-20 mm, and the upper stitching piece 4 has a thickness of 1 / 3 to 2 / 3 of the original thickness of the high-temperature resistant fiber felt.

[0058] The first seam edge 21 and the second seam edge 22 have the same structure. The seam spacing is b, which is 5 to 30 mm. The seam stitch length is a, which is 5 to 30 mm. The seam stitch length of the third seam edge 23 is c, which is 5 to 30 mm.

[0059] The high-temperature resistant fiber felt is one of the following: mullite fiber felt, quartz fiber felt, carbon fiber felt, alumina fiber felt, or silicon carbide fiber felt;

[0060] The sewing thread of the stitching structure 2 is one of quartz fiber sewing thread, alumina fiber sewing thread, carbon fiber sewing thread, or silicon carbide fiber sewing thread, and the fineness of the sewing thread is 120-680 tex.

[0061] A method for manufacturing a high-temperature resistant heat-insulating fiber felt connection structure, the method comprising the following steps:

[0062] S1. Cutting: Cut the high-temperature resistant fiber felt to the appropriate size according to the drawing, leaving a cutting allowance. Cut off the designed thickness from the ends of the cut high-temperature resistant fiber felt to form the upper sewing piece 4 and the lower sewing piece 5. At this point, the cutting is complete.

[0063] Based on the thickness of the high-temperature resistant fiber felt, select an aluminum strip of appropriate specifications. The thickness of the aluminum strip is the design thickness of the upper stitching piece 4. The length of the aluminum strip is greater than the cutting part at the end of the high-temperature resistant fiber felt. Then, mark the cutting part with a marker. Place the fiber felt between two aluminum strips, with the aluminum strips and the sides of the fiber felt tightly attached. Place a thin blade above the aluminum strip and cut the fiber felt parallel to the length of the aluminum strip until it cuts below the marked line. Then, use the blade to cut vertically downwards along the marked line until the blade touches the aluminum strip. At this point, the cutting is complete.

[0064] S2. Marking and positioning: Determine the suturing structure parameters of the first suture edge 21, the second suture edge 22 and the third suture edge 23. Align and flatten the upper suture piece 4 and the lower suture piece 5 according to the suturing state. Then mark the pinhole positions of the first suture edge 21, the second suture edge 22 and the third suture edge 23 on the left piece 11, the right piece 12 and the upper suture piece 4 according to the suturing parameters.

[0065] S3. Suturing: First, position the sutures, then suture the edges. First, sew the upper suture piece 4 and the lower suture piece 5 together using double-thread backstitching according to the suture points of the third suture edge 23. Then, sew the upper suture piece 4, the lower suture piece 5, and the right piece 12 together using double-thread stitching according to the suture points of the second suture edge 22. Finally, sew the lower suture piece 5, the upper suture piece 4, and the left piece 11 together using double-thread stitching according to the suture points of the first suture edge 21.

[0066] S4. Glue application: Mix the resin glue and solvent at a mass ratio of 1:0.5 to 10, stir well, and inject the mixed resin glue solution into the needle hole position of the sewn structure using a glue application device. Dry at 40 to 80°C for 1 to 12 hours to evaporate the solvent and solidify the resin glue to bond the sewing thread and surrounding fiber felt together, thus completing the manufacturing process.

[0067] In step S4, dispensing, the dispensing equipment needs to inject the compound resin adhesive solution into the needle hole from both sides.

[0068] The resin adhesive is one or more of silicone rubber resin and boron phenolic resin; the solvent of the resin adhesive is one or more of petroleum ether and anhydrous ethanol.

[0069] Comparative Example 1:

[0070] The preparation steps of Comparative Example 1 are basically the same as those of Example 1, except that:

[0071] S1. Cutting: Use 9mm thick mullite fiber felt and cut it into strips of 135mm*50mm. Cut off 4 / 9 of the thickness and 50mm in length at the end. Form the cut high-temperature resistant fiber felt into upper sewing piece 4 and lower sewing piece 5. At this point, the cutting is complete.

[0072] S2. Determine that the stitch length c of the third suture edge 23 is 5 mm, and determine that the suture spacing b of the first suture edge 21 and the second suture edge 22 is 0 mm and the stitch length a is 5 mm. Then, mark the pinhole positions of the first suture edge 21, the second suture edge 22 and the third suture edge 23 on the left piece 11, the right piece 12 and the upper suture piece 4 according to the suture parameters.

[0073] S3. Positioning suture: Using 198tex quartz fiber sewing thread, the upper suture piece 4 and the lower suture piece 5 are sutured and positioned according to the suture point of the third suture edge 23 using a double-thread backstitch.

[0074] Edge stitching: Using 198tex quartz fiber sewing thread, the upper sewing piece 4 and the lower sewing piece 5 are stitched together using a double-thread backstitch method according to the stitching points of the first sewing edge 21 and the second sewing edge 22.

[0075] Manufacturing is now complete.

[0076] Example 2:

[0077] The manufacturing steps of Embodiment 2 are basically the same as those of Embodiment 1, except that:

[0078] S1. Cutting: Use 9mm thick mullite fiber felt and cut it into strips of 135mm*50mm. Cut off 4 / 9 of the thickness and 50mm in length at the end. Form the cut high-temperature resistant fiber felt into upper sewing piece 4 and lower sewing piece 5. At this point, the cutting is complete.

[0079] S2. Determine that the stitch length c of the third suture edge 23 is 5 mm, and determine that the suture spacing b of the first suture edge 21 and the second suture edge 22 is 10 mm and the stitch length a is 10 mm. Then, mark the pinhole positions of the first suture edge 21, the second suture edge 22 and the third suture edge 23 on the left piece 11, the right piece 12 and the upper suture piece 4 according to the suture parameters.

[0080] S3. Positioning suture: Using 198tex quartz fiber sewing thread, the upper suture piece 4 and the lower suture piece 5 are sutured and positioned according to the suture point of the third suture edge 23 using a double-thread backstitch.

[0081] Edge stitching: Using 198tex quartz fiber sewing thread, the upper sewing piece 4, the lower sewing piece 5, and the right piece 12 are stitched together using double-thread stitching according to the stitching points of the second sewing edge 22. Then, the lower sewing piece 5, the upper sewing piece 4, and the left piece 11 are stitched together using double-thread stitching according to the stitching points of the first sewing edge 21.

[0082] At this point, manufacturing is complete, and no further adhesive dispensing steps are required.

[0083] Example 3:

[0084] Example 3 is basically the same as Example 2, except that in step S2, the suture spacing b is 10 mm and the suture stitch distance a is 5 mm.

[0085] Example 4:

[0086] Example 4 is basically the same as Example 2, except that: in step S2, the suture spacing b is 10 mm, the suture stitch distance a is 10 mm, and the first suture edge 21, the second suture edge 22 and the third suture edge 23 are all sutured using the double-thread backstitch method.

[0087] Example 5:

[0088] Example 5 is basically the same as Example 2, except that in step S2, the suture spacing b is 20 mm and the suture stitch distance a is 5 mm.

[0089] Example 6:

[0090] Example 6 is basically the same as Example 2, except that:

[0091] In step S2, the suture spacing b is 10 mm and the suture stitch distance a is 5 mm. The first suture edge 21, the second suture edge 22 and the third suture edge 23 are all sutured using the double-thread backstitch method.

[0092] S4. Dispensing treatment: Mix silicone resin adhesive and petroleum ether solvent in a 1:2 mass ratio, stir well, and use dispensing equipment to inject the mixed resin adhesive solution into the needle hole position of the sewn structure. Dry at 60℃ for 8 hours to evaporate the solvent and solidify the resin adhesive to bond the sewing thread and surrounding fiber felt together at the needle hole.

[0093] The mechanical tensile properties of the samples from the above embodiments were tested on an Instron universal testing machine at a tensile rate of 20 mm / min. The efficiency of the fiber felt seam was calculated using the following formula, and the statistical results are shown in Table 1.

[0094]

[0095] Table 1. Joint efficiency of high-temperature resistant fiber felt under normal temperature conditions.

[0096]

[0097] Comparative Example 2:

[0098] Comparative Example 2 is basically the same as Comparative Example 1, except that: in step S2, the suture spacing b is 0 mm, the suture stitch length a is 10 mm, and the suture stitch length c of the third suture edge 23 is 10 mm.

[0099] Example 7:

[0100] Example 7 is basically the same as Example 6, except that:

[0101] In step S3, 317tex alumina fiber sewing thread is used for stitching.

[0102] The finished products of Comparative Example 2 and Examples 6-7 were subjected to tensile tests at a high temperature of 1000°C, and the results are shown in Table 2.

[0103] Table 2. Joint efficiency of high-temperature resistant fiber felt at 1000℃

[0104]

[0105] Example 8:

[0106] Example 8 is basically the same as Example 6, except that: 15mm thick quartz fiber felt is used, the end is cut by 1 / 2 thickness, and 276tex quartz fiber sewing thread is used for sewing. The seam efficiency is 94.6%, and it can be used for a long time under high temperature conditions of 800℃.

[0107] Example 9:

[0108] Example 9 is basically the same as Example 6, except that: 10mm thick alumina fiber felt is used, the end is cut by 1 / 2 thickness, and 667tex alumina fiber sewing thread is used for sewing. The seam efficiency is 91.5%, and it can be used for a long time under high temperature conditions of 1200℃.

[0109] As shown in Tables 1 and 2, by adjusting the sewing parameters through the embodiments designed in this invention, the efficiency of fiber felt joints can easily be increased to over 80%. Through the manufacturing method of the high-temperature resistant heat-insulating fiber felt connection structure proposed in this invention, including cutting, positioning sewing, edge sewing, and adhesive application, the efficiency of fiber felt joints can be increased to 97.5%, approaching the strength of unsewn fiber felt. This effectively achieves high-strength connections for thick fiber felts. Furthermore, the adhesive application can compensate for large pinholes caused by sewing, preventing heat transfer through these pinholes and further improving the performance of the fiber felt connection structure.

Claims

1. A high-temperature resistant heat-insulating fiber felt connection structure, comprising: The heat insulation layer body (1) is characterized in that: The heat insulation layer body (1) is a high temperature resistant fiber felt. The heat insulation layer body (1) includes a left piece (11) and a right piece (12). The upper end of the left piece (11) is provided with an integrated upper sewn piece (4), and the lower end of the right piece (12) is provided with an integrated lower sewn piece (5). The upper sewn piece (4) and the lower sewn piece (5) have the same shape and size. The bottom surface of the upper sewn piece (4) is attached to the top surface of the lower sewn piece (5). The heat insulation layer body (1) is provided with a sewing structure (2) and an adhesive structure (3). The upper sewn piece (4) on the left piece (11) is sewn together with the lower sewn piece (5) on the right piece (12) through the sewing structure (2). The suture structure (2) includes: a first suture edge (21), a second suture edge (22) and a third suture edge (23). The second suture edge (22) is the joint between the upper suture piece (4) and the right piece (12). The second suture edge (22) sews the upper suture piece (4) together with the right piece (12) and the lower suture piece (5) using a double-thread stitch. The first suture edge (21) is the joint between the lower suture piece (5) and the left piece (11). The first suture edge (21) sews the lower suture piece (5) together with the left piece (11) and the upper suture piece (4) using a double-thread stitch. The third suture edge (23) is the central axis between the upper suture piece (4) and the lower suture piece (5). The third suture edge (23) sews the upper suture piece (4) and the lower suture piece (5) together using a double-thread backstitch. The first suture edge (21) and the second suture edge (22) have the same structure, the suture spacing b is 5 to 30 mm, the suture stitch distance a is 5 to 30 mm, and the suture stitch distance c of the third suture edge (23) is 5 to 30 mm. The needle holes of the first suture edge (21), the second suture edge (22) and the third suture edge (23) are filled with adhesive structure (3); after the temperature exceeds 600℃, the adhesive structure (3) is carbonized, and the carbonized adhesive seals the needle holes to maintain its heat insulation performance and reduce heat transfer.

2. The high-temperature resistant heat-insulating fiber felt connection structure according to claim 1, characterized in that: The heat insulation layer body (1) has a high-temperature resistant fiber felt thickness of 5 to 20 mm, and the upper stitching piece (4) has a thickness of 1 / 3 to 2 / 3 of the original thickness of the high-temperature resistant fiber felt.

3. The high-temperature resistant heat-insulating fiber felt connection structure according to claim 2, characterized in that: The high-temperature resistant fiber felt is one of the following: mullite fiber felt, quartz fiber felt, carbon fiber felt, alumina fiber felt, or silicon carbide fiber felt; The sewing thread of the stitching structure (2) is one of quartz fiber sewing thread, alumina fiber sewing thread, carbon fiber sewing thread, or silicon carbide fiber sewing thread, and the fineness of the sewing thread is 120~680 tex.

4. A method for manufacturing a high-temperature resistant heat-insulating fiber felt connection structure according to any one of claims 1-3, characterized in that: The manufacturing method includes the following steps: S1. Cutting: Cut the high-temperature resistant fiber felt to the appropriate size according to the drawing, and leave a cutting allowance. Cut off the designed thickness at the end of the cut high-temperature resistant fiber felt to form the upper sewing piece (4) and the lower sewing piece (5). At this time, the cutting is completed. S2, Marking and Positioning: Determine the suture structure parameters of the first suture edge (21), the second suture edge (22), and the third suture edge (23). Align and flatten the upper suture piece (4) and the lower suture piece (5) according to the suture state. Then mark the pinhole positions of the first suture edge (21), the second suture edge (22), and the third suture edge (23) on the left piece (11), the right piece (12), and the upper suture piece (4) according to the suture parameters. S3. Suturing: First, position the sutures and then suture the edges. First, sew the upper suture piece (4) and the lower suture piece (5) together using double-thread backstitching according to the suture point of the third suture edge (23). Then, sew the upper suture piece (4) together with the lower suture piece (5) and the right piece (12) together using double-thread stitching according to the suture point of the second suture edge (22). Then, sew the lower suture piece (5) together with the upper suture piece (4) and the left piece (11) together using double-thread stitching according to the suture point of the first suture edge (21). S4. Glue application: Mix the resin glue and solvent at a mass ratio of 1:0.5~10, stir well, and use a glue application device to inject the mixed resin glue solution into the needle hole position of the sewn structure. Dry at 40~80 ℃ for 1~12 hours to evaporate the solvent and solidify the resin glue to bond the sewing thread and surrounding fiber felt together, thus completing the manufacturing process.

5. The manufacturing method of a high-temperature resistant heat-insulating fiber felt connection structure according to claim 4, characterized in that: In the S1 cutting process, aluminum strips of appropriate specifications are selected according to the thickness of the high-temperature resistant fiber felt. The thickness of the aluminum strip is the design thickness of the upper sewing piece (4). The length of the aluminum strip is greater than the cutting part at the end of the high-temperature resistant fiber felt. Then, the cutting part is marked with a marker pen. The fiber felt is placed between two aluminum strips. The aluminum strips are in close contact with both sides of the fiber felt. A thin blade is placed above the aluminum strip. The blade cuts the fiber felt parallel to the length of the aluminum strip until it is cut below the marked line. Then, the blade is used to cut vertically downward along the marked line until the blade touches the aluminum strip. At this time, the cutting is completed.

6. The manufacturing method of a high-temperature resistant heat-insulating fiber felt connection structure according to claim 4, characterized in that: In step S4, dispensing, the dispensing equipment needs to inject the compound resin adhesive solution into the needle hole from both sides. The resin adhesive is one or more of silicone rubber resin and boron phenolic resin; the solvent of the resin adhesive is one or more of petroleum ether and anhydrous ethanol.

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