Thermal insulation assembly for a hot isostatic pressing apparatus
Patent Information
- Application Number
- CN202522666250.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-12-16
- Publication Date
- 2026-11-03
- Estimated Expiration
- 2035-12-16
AI Technical Summary
Existing hot isostatic pressing equipment's insulation components are prone to cracking and chipping due to uneven thermal expansion under extreme temperature differences, which can lead to stress accumulation, gap expansion, and reduced workpiece processing quality.
The design employs a combination of polycrystalline mullite fiberboard and flexible support components, including a fan-shaped structure and an elastic compensation structure. The flexible support components buffer thermal expansion stress and dynamically fill gaps to ensure thermal insulation, sealing, and temperature uniformity.
It effectively buffers the thermal expansion stress under extreme temperature differences, prevents component cracking and gap expansion, ensures thermal insulation and sealing, improves temperature uniformity inside the furnace, and enhances the quality of hot isostatic pressing of workpieces.
Smart Images
Figure CN224933238U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the technical field of hot isostatic pressing equipment, specifically a heat insulation component for hot isostatic pressing equipment. Background Technology
[0002] Hot isostatic pressing (HIP) equipment is a high-end manufacturing equipment based on Pascal's law that can create high-temperature and high-pressure working conditions in a closed environment to perform precision processing such as densification on materials. When it is working, a vacuum pump is first used to remove impurity gases in the container, and then an inert gas is compressed by a compressor. Combined with a resistance or induction heating system, a target temperature and pressure environment is formed. By utilizing the characteristic of gas to transmit pressure uniformly in all directions, the internal pores of the workpiece are closed and the grains are optimized, resulting in a product with a density of over 99% and uniform performance. The thermal insulation components of hot isostatic pressing equipment are key components installed in a closed pressure vessel and adapted to ultra-high temperature and high pressure conditions. On the one hand, they can prevent the heat of the heating element from dissipating outward, avoid heat loss, and ensure the service life of the equipment. On the other hand, they can reduce the temperature unevenness caused by high-pressure gas convection, allowing the loading area to maintain a stable high-temperature environment to ensure the processing quality of the workpiece. Existing thermal insulation components mostly adopt rigid splicing or integral design, and their thermal expansion coefficient is difficult to adapt to the deformation requirements under extreme temperature differences. In high-temperature environments, the different parts of the rigid components generate significant internal stress due to inconsistent thermal expansion, and this stress is difficult to release through the structure itself. Long-term accumulation will lead to damage such as cracking and chipping of the components. At the same time, gaps will be generated at the splicing points of the rigid structure due to uneven thermal expansion. With repeated thermal expansion and contraction caused by the start and stop of the equipment, the gaps gradually widen, destroying the sealing performance of the thermal insulation structure. The widened sealing gap will cause a large amount of high-temperature heat to leak out of the furnace, reducing the temperature uniformity inside the furnace and affecting the processing quality of the workpiece in hot isostatic pressing. Therefore, a thermal insulation component for hot isostatic pressing equipment is proposed to address the above problems. Utility Model Content
[0003] The purpose of this invention is to provide a thermal insulation component for a hot isostatic pressing device to solve the problems mentioned in the background art.
[0004] To achieve the above objectives, this utility model provides the following technical solution: A thermal insulation component for a hot isostatic pressing (HIP) equipment includes a thermal insulation component and a flexible support component. The thermal insulation component is coaxially arranged with the HIP furnace body, and the flexible support component is sleeved on the outside of the thermal insulation component. The flexible support component and the thermal insulation component are coaxially arranged and have the same height. The thermal insulation component includes multiple polycrystalline mullite fiber boards, each with a fan-shaped structure. The multiple polycrystalline mullite fiber boards are distributed in a circumferential array at equal intervals around the center of the HIP furnace body. Thermal expansion gaps are left between adjacent polycrystalline mullite fiber boards, and multiple elastic compensation structures are arranged longitudinally at equal intervals in the gaps between adjacent polycrystalline mullite fiber boards.
[0005] As a further optimization of this utility model, the edges of the polycrystalline mullite fiberboard are rounded, and the inner diameter of the polycrystalline mullite fiberboard is adapted to the inner diameter of the hot isostatic pressing furnace.
[0006] As a further optimization of this utility model, the elastic compensation structure includes a connection hole opened on the side wall of the polycrystalline mullite fiberboard and an alloy elastic sheet disposed between adjacent polycrystalline mullite fiberboards, wherein the alloy elastic sheet corresponds one-to-one with the connection hole.
[0007] As a further optimization of this utility model, the alloy elastic sheet is designed with an arc shape that matches the curvature of the polycrystalline mullite fiberboard, and the center of the alloy elastic sheet protrudes outward in its natural state.
[0008] As a further optimization of this utility model, the alloy elastic sheet has symmetrical and fixedly connected connecting rods adapted to the connecting holes at both ends. The bottom of the connecting rod is provided with a receiving groove, and the receiving groove is provided with a matching outward expansion plate. One end of the outward expansion plate is hinged to the end of the receiving groove.
[0009] As a further optimization of this utility model, a reset groove is provided in the receiving groove, and a reset spring is fixedly connected to the inner end face of the reset groove. The bottom end of the reset spring is fixedly connected to the inner side wall of the outward expansion plate.
[0010] As a further optimization of this utility model, the flexible support component includes an alloy corrugated ring and an impermeable graphite ring. The inner side of the alloy corrugated ring is bonded to the outer side of the polycrystalline mullite fiberboard, and the impermeable graphite ring is sleeved on the outer side of the alloy corrugated ring. The inner side of the impermeable graphite ring has a corrugated structure adapted to fit the alloy corrugated ring.
[0011] As a further optimization of this utility model, the outer side of the alloy corrugated ring is provided with multiple sets of positioning pins arranged in a circumferential array, and the inner side of the impermeable graphite ring is provided with multiple sets of positioning grooves that are adapted to the positioning pins, and the positioning pins are inserted into the positioning grooves at the corresponding positions.
[0012] Compared with the prior art, the beneficial effects of this utility model are: In this invention, the fan-shaped splicing design and elastic compensation structure are adapted to the thermal expansion and contraction under extreme temperature differences, effectively buffering and releasing internal stress, avoiding component cracking and edge chipping, while dynamically filling the splicing gaps to ensure heat insulation and sealing, reduce heat leakage in the furnace, improve the temperature uniformity in the furnace, and ensure the quality of hot isostatic pressing of the workpiece. Attached Figure Description
[0013] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is an exploded view of the structure of this utility model; Figure 3 This is a schematic diagram of the structure of the heat insulation component of this utility model; Figure 4 This utility model Figure 3 Enlarged view of point A; Figure 5 This is a cross-sectional view of the connecting rod of this utility model; Figure 6 This is an assembly drawing of the flexible support component of this utility model; Figure 7 This utility model Figure 6 Enlarged view of point B.
[0014] In the diagram: 1. Thermal insulation component; 11. Polycrystalline mullite fiberboard; 12. Elastic compensation structure; 121. Connecting socket; 122. Alloy elastic sheet; 123. Connecting rod; 124. Receiving groove; 125. Outward expansion plate; 126. Reset groove; 127. Reset spring; 2. Flexible support component; 21. Alloy corrugated ring; 22. Impermeable graphite ring; 23. Positioning pin; 24. Positioning groove. Detailed Implementation
[0015] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.
[0016] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.
[0017] Please see Figures 1-7 This utility model provides a technical solution: A thermal insulation component for a hot isostatic pressing (HIP) equipment includes a thermal insulation component 1 and a flexible support component 2. The thermal insulation component 1 is coaxially arranged with the HIP furnace body. The flexible support component 2 is sleeved on the outside of the thermal insulation component 1. The flexible support component 2 is coaxially arranged with the thermal insulation component 1, and the flexible support component 2 and the thermal insulation component 1 are arranged at the same height. The thermal insulation component 1 includes multiple polycrystalline mullite fiber boards 11. The polycrystalline mullite fiber boards 11 have a fan-shaped structure. The multiple polycrystalline mullite fiber boards 11 are distributed in a circumferential array with the center of the HIP furnace body as the center. A thermal expansion gap is left between adjacent polycrystalline mullite fiber boards 11. Multiple elastic compensation structures 12 are arranged longitudinally at equal intervals in the gaps between adjacent polycrystalline mullite fiber boards 11.
[0018] It should be noted that the heat insulation component 1 and the flexible support component 2 are coaxially arranged and have the same height to ensure that the heat distribution in the hot isostatic pressing furnace is uniform and avoid local high temperature concentration that could damage the equipment. Multiple fan-shaped polycrystalline mullite fiber boards 11 are arranged in a circumferential array to precisely fit the furnace structure. The thermal expansion gap between adjacent boards can buffer the expansion stress under high temperature. The elastic compensation structure 12 further eliminates the heat insulation gap and improves the overall heat insulation effect. As a further implementation of this scheme, the edges of the polycrystalline mullite fiberboard 11 are rounded, and the inner diameter of the polycrystalline mullite fiberboard 11 is adapted to the inner diameter of the hot isostatic pressing furnace. It should be noted that the rounded corners of the polycrystalline mullite fiberboard 11 reduce stress concentration on the board and prevent brittle fracture from affecting its service life under high temperature conditions. Its inner diameter is precisely matched with the inner diameter of the hot isostatic pressing furnace, which can fit tightly inside the furnace body, reduce heat loss from the gap between the board and the furnace wall, and ensure the sealing and reliability of the insulation. As a further implementation of this solution, the elastic compensation structure 12 includes a connection hole 121 opened on the side wall of the polycrystalline mullite fiber board 11 and an alloy elastic sheet 122 disposed between adjacent polycrystalline mullite fiber boards 11. The alloy elastic sheet 122 corresponds one-to-one with the connection hole 121. The alloy elastic sheet 122 is arc-shaped with the same curvature as the polycrystalline mullite fiber board 11, and the center of the alloy elastic sheet 122 protrudes outward in its natural state. It should be noted that: the connecting hole 121 of the elastic compensation structure 12 provides a stable installation base for the alloy elastic sheet 122. The arc-shaped alloy elastic sheet 122 has the same curvature as the polycrystalline mullite fiberboard 11, ensuring that it is compatible with the furnace structure after splicing. The design of the center protruding outward in the natural state gives the alloy elastic sheet 122 good expansion and contraction compensation ability, which can deform synchronously with the thermal expansion of the plate and always fill the gap. As a further implementation of this solution, the two ends of the alloy elastic sheet 122 are symmetrically and fixedly connected with connecting rods 123 that are adapted to the connecting socket 121. The bottom of the connecting rod 123 is provided with a receiving groove 124. The receiving groove 124 is provided with a matching outward expansion plate 125. One end of the outward expansion plate 125 is hinged to the end of the receiving groove 124. The receiving groove 124 is provided with a reset groove 126. The inner end face of the reset groove 126 is fixedly connected with a reset spring 127. The bottom end of the reset spring 127 is fixedly connected to the inner side wall of the outward expansion plate 125. It should be noted that the connecting rods 123 at both ends of the alloy elastic sheet 122 are precisely matched with the connecting holes 121. After insertion, the outward expansion plate 125 pops out under the action of the reset spring 127, and clamps the inner wall of the connecting hole 121 to achieve a firm fixation. This snap-fit connection does not require additional fasteners, is easy to install and disassemble, and the reset spring 127 can provide continuous elastic support for the outward expansion plate 125 to prevent the connection from loosening under high temperature. As a further implementation of this solution, the flexible support component 2 includes an alloy corrugated ring 21 and an impermeable graphite ring 22. The inner side of the alloy corrugated ring 21 is attached to the outer side of the polycrystalline mullite fiberboard 11, and the impermeable graphite ring 22 is sleeved on the outer side of the alloy corrugated ring 21. The inner side of the impermeable graphite ring 22 is a corrugated structure adapted to the alloy corrugated ring 21. It should be noted that: the inner side of the alloy corrugated ring 21 of the flexible support component 2 is attached to the outer side of the polycrystalline mullite fiberboard 11, which not only provides radial support for the heat insulation component 1, but also absorbs thermal expansion through the corrugated structure. The impermeable graphite ring 22 is sleeved on the outer side, and its inner corrugated structure is adapted to the alloy corrugated ring 21 to form a double flexible constraint, which prevents the heat insulation component 1 from deforming and shifting due to high temperature. As a further implementation of this scheme, the outer side of the alloy corrugated ring 21 is provided with multiple sets of positioning pins 23 arranged in a circular array, and the inner side of the impermeable graphite ring 22 is provided with multiple sets of positioning grooves 24 that are adapted to the positioning pins 23, and the positioning pins 23 are inserted into the positioning grooves 24 at the corresponding positions. It should be noted that the positioning pins 23 on the outer side of the alloy corrugated ring 21 and the positioning grooves 24 on the inner side of the impermeable graphite ring 22 are precisely matched to achieve circumferential positioning of the two and prevent relative sliding. Multiple sets of positioning pins 23 are distributed in a circumferential array to ensure balanced force, further improve the structural stability of the flexible support component 2, and ensure the fixed position of the heat insulation component 1 under high temperature and high pressure environment.
[0019] Work process: During the assembly stage of the heat insulation component 1, multiple fan-shaped polycrystalline mullite fiber boards 11 are first arranged in a circular array with the center of the hot isostatic pressing furnace body as the center, ensuring that a thermal expansion gap is reserved between adjacent boards and that the rounded corners of the board edges do not contact each other to avoid stress concentration. Then, the elastic compensation structure 12 is installed, and the connecting rods 123 at both ends of the alloy elastic sheet 122 are aligned with the connecting holes 121 on the side walls of the adjacent polycrystalline mullite fiber boards 11 and inserted. During the insertion process, the outward expansion plate 125 at the bottom of the connecting rod 123 is squeezed and contracted into the receiving groove 124 by the inner wall of the insertion hole. When the connecting hole 121 is fully inserted, the reset spring 127 in the reset groove 126 releases elastic potential energy, pushing the outward expansion plate 125 to expand outward and clamp the inner wall of the connecting hole 121, thereby achieving a firm fixation of the alloy elastic sheet 122. At this time, the middle part of the arc-shaped alloy elastic sheet 122 protrudes outward, naturally filling the gap between adjacent boards. After the heat insulation component 1 is assembled, the flexible support component 2 is assembled. The alloy corrugated ring 21 is fitted onto the outside of the heat insulation component 1, ensuring that the inside of the alloy corrugated ring 21 is tightly fitted with the outside of the polycrystalline mullite fiberboard 11. Then, the impermeable graphite ring 22 is aligned with the alloy corrugated ring 21 and fitted onto it, so that the positioning pin 23 on the outside of the alloy corrugated ring 21 is accurately inserted into the positioning groove 24 on the inside of the impermeable graphite ring 22, achieving circumferential positioning of the two. At the same time, the corrugated structure on the inside of the impermeable graphite ring 22 is fully adapted to the alloy corrugated ring 21, forming a double flexible constraint. Throughout the assembly process, the heat insulation component 1 and the flexible support component 2 are ensured to be coaxially set and at the same height, ensuring the accuracy of subsequent installation in the furnace. The assembled thermal insulation structure is hoisted into the hot isostatic pressing furnace, so that the inner diameter of the polycrystalline mullite fiber board 11 is precisely fitted with the inner diameter of the furnace, reducing heat loss from the gap between the board and the furnace wall. After the hot isostatic pressing equipment is started, the temperature inside the furnace gradually rises. The polycrystalline mullite fiber board 11 expands due to the high temperature, and the thermal expansion gap between adjacent boards gradually shrinks. At this time, the alloy elastic sheet 122 of the elastic compensation structure 12 is deformed synchronously by the extrusion of the board, and the central protrusion gradually shrinks, which not only provides a buffer space for the expansion of the board, but also always fills the gap to avoid thermal insulation leakage. At the same time, the alloy corrugated ring 21 of the flexible support component 2 absorbs the radial expansion of the thermal insulation component 1 through its own corrugated structure, and the impermeable graphite ring 22 provides stable support with its outer side to prevent the thermal insulation component 1 from deforming and shifting at high temperature. During high-temperature and high-pressure operation, the polycrystalline mullite fiberboard 11 plays a core role in heat insulation, preventing heat from the furnace from being conducted outward. The elastic compensation structure 12 continuously adapts to the expansion and contraction of the board through the elastic deformation of the alloy elastic sheet 122, ensuring the continuity of heat insulation. The flexible cooperation between the alloy corrugated ring 21 and the impermeable graphite ring 22 provides reliable radial support for the heat insulation component 1 and avoids damage to the board caused by rigid constraints. The cooperation between the positioning pin 23 and the positioning groove 24 prevents the two from sliding relative to each other, ensuring the stability of the support. After the equipment finishes working, the temperature inside the furnace gradually decreases, the polycrystalline mullite fiberboard 11 contracts, and the alloy elastic sheet 122 returns to its central convex state under its own elasticity. The alloy corrugated ring 21 also resets synchronously, and the entire heat insulation structure returns to its initial state.
[0020] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.
Claims
1. A thermal insulation component (1) for a hot isostatic pressing device, comprising a thermal insulation component (1) and a flexible support component (2), characterized in that: The heat insulation component (1) is coaxially arranged with the hot isostatic pressing furnace body, and the flexible support component (2) is sleeved on the outside of the heat insulation component (1). The flexible support component (2) is coaxially arranged with the heat insulation component (1), and the flexible support component (2) and the heat insulation component (1) are arranged at the same height. The heat insulation component (1) includes multiple polycrystalline mullite fiberboards (11). The polycrystalline mullite fiberboards (11) are fan-shaped structures. The multiple polycrystalline mullite fiberboards (11) are distributed in a circumferential array with the center of the hot isostatic pressing furnace body as the center. There is a thermal expansion gap between adjacent polycrystalline mullite fiberboards (11). Multiple elastic compensation structures (12) are arranged longitudinally at equal intervals in the gap between adjacent polycrystalline mullite fiberboards (11).
2. The thermal insulation component (1) of a hot isostatic pressing device according to claim 1, characterized in that: The edges of the polycrystalline mullite fiberboard (11) are rounded, and the inner diameter of the polycrystalline mullite fiberboard (11) is adapted to the inner diameter of the hot isostatic pressing furnace.
3. The thermal insulation component (1) of a hot isostatic pressing device according to claim 1, characterized in that: The elastic compensation structure (12) includes a connection hole (121) opened on the side wall of the polycrystalline mullite fiberboard (11) and an alloy elastic sheet (122) disposed between adjacent polycrystalline mullite fiberboards (11), wherein the alloy elastic sheet (122) corresponds one-to-one with the connection hole (121).
4. The thermal insulation component (1) of a hot isostatic pressing device according to claim 3, characterized in that: The alloy elastic sheet (122) is an arc shape with the same curvature as the polycrystalline mullite fiberboard (11), and the center of the alloy elastic sheet (122) protrudes outward in its natural state.
5. The thermal insulation component (1) of a hot isostatic pressing device according to claim 4, characterized in that: The alloy elastic sheet (122) has symmetrical and fixed connections at both ends with connecting rods (123) that are compatible with the connecting holes (121). The bottom of the connecting rod (123) is provided with a receiving groove (124). The receiving groove (124) is provided with a matching outward expansion plate (125), and one end of the outward expansion plate (125) is hinged to the end of the receiving groove (124).
6. The thermal insulation component (1) of a hot isostatic pressing device according to claim 5, characterized in that: A reset groove (126) is provided in the receiving groove (124). A reset spring (127) is fixedly connected to the inner end face of the reset groove (126). The bottom end of the reset spring (127) is fixedly connected to the inner side wall of the outward expansion plate (125).
7. The thermal insulation component (1) of a hot isostatic pressing device according to claim 1, characterized in that: The flexible support component (2) includes an alloy corrugated ring (21) and an impermeable graphite ring (22). The inner side of the alloy corrugated ring (21) is attached to the outer side of the polycrystalline mullite fiberboard (11). The impermeable graphite ring (22) is sleeved on the outer side of the alloy corrugated ring (21), and the inner side of the impermeable graphite ring (22) is a corrugated structure adapted to the alloy corrugated ring (21).
8. The thermal insulation component (1) of a hot isostatic pressing device according to claim 7, characterized in that: The outer side of the alloy corrugated ring (21) is provided with multiple sets of positioning pins (23) arranged in a circular array. The inner side of the impermeable graphite ring (22) is provided with multiple sets of positioning grooves (24) that are adapted to the positioning pins (23). The positioning pins (23) are inserted into the positioning grooves (24) at the corresponding positions.