Vacuum desorption structure of a hot isostatic pressing can
By combining the main and auxiliary pumping circuits and the scraping and guiding components, the problem of condensate blockage during the thermal isostatic desorption process was solved, achieving efficient pumping and continuous desorption without human intervention.
Patent Information
- Application Number
- CN202522621936.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-12-10
- Publication Date
- 2026-11-03
- Estimated Expiration
- 2035-12-10
AI Technical Summary
During the vacuum desorption process, condensate accumulates on the inner wall of the pumping channel, causing blockage and affecting pumping efficiency. Existing solutions require frequent disassembly and cleaning of the channel, increasing operational complexity and easily damaging the sealing performance.
Design a main and auxiliary combined air extraction circuit, combining a scraping component and a guiding component. The airflow self-drives the scraping of condensate on the inner wall of the channel, while the dynamic guiding component prevents condensate from agglomerating and avoids channel blockage.
It enables real-time cleaning of condensate without manual disassembly, keeps the air extraction channel unobstructed, ensures the continuity and efficiency of the desorption process, prevents channel blockage, and improves the reliability of desorption operations.
Smart Images
Figure CN224925854U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of hot isostatic pressing (HOP) cladding technology, specifically a vacuum desorption structure for HOP cladding. Background Technology
[0002] Hot isostatic pressing (HIP) encapsulation is a special sealed container used in the hot isostatic pressing (HIP) process to encapsulate powders, blanks, or parts to be processed. Its core function is to isolate the high-pressure, high-temperature medium (usually argon) from the workpiece, while transmitting uniform pressure and temperature, so that the workpiece can achieve densification or defect repair under a pressure of 100-200MPa and a temperature of 800-2000℃. It is widely used in high-end manufacturing fields such as aerospace, metallurgy, ceramics, and composite materials. Vacuum desorption of the hot isostatic pressing (HIP) cladding is a key pretreatment process for the cladding and the blank inside to be processed before the HIP process. The core is to remove moisture, air, volatile impurities (such as oil and residual solvents) and gas components adsorbed inside the cladding and the blank through the synergistic effect of vacuum environment and gradient temperature rise. This avoids defects such as cladding seal failure and workpiece porosity and cracks caused by impurity vaporization or gas expansion during the HIP process. During vacuum desorption of a hot isostatic pressing (HIP) jacket, volatile substances (such as residual lubricant and low-melting-point impurities) in the high-temperature environment inside the jacket will enter the pumping channel with the gas flow. After encountering cooling on the inner wall of the channel, they will condense into solid or viscous substances. As the desorption time increases, these condensates will gradually accumulate, causing the cross-sectional area of the pumping channel to shrink or even completely block it. This will cause a sharp drop in the pumping efficiency of the vacuum unit and force the desorption process to be interrupted. Existing solutions mostly solve this problem by periodically disassembling the channel to clean the condensates, but this increases the complexity of the operation process. Frequent disassembly can damage the sealing performance of the jacket, and it is difficult to deal with the blockage problem in real time during the desorption process. Therefore, a vacuum desorption structure for a HIP jacket is proposed to address the above problems. Utility Model Content
[0003] The purpose of this invention is to provide a vacuum desorption structure for a thermal isostatic pressing (TIP) cladding to solve the problems mentioned in the background art.
[0004] To achieve the above objectives, this utility model provides the following technical solution: A vacuum desorption structure for a thermal isostatic pressing (TIP) cladding includes a cladding body. A main pipe is fixedly inserted into the top center of the cladding body. The top of the main pipe has a connecting flange for connection to an external vacuum unit. A scraping assembly is provided inside the main pipe. Secondary pipes are symmetrically arranged on both sides of the main pipe. A guiding assembly is provided inside the secondary pipe. The scraping assembly includes a sliding ring. The outer diameter of the sliding ring is adapted to the inner diameter of the main pipe, and the sliding ring is rotatably connected to the top of the inner cavity of the main pipe. A rotating rod is provided below the sliding ring. The top end of the rotating rod is fixedly connected to the inner wall of the sliding ring through multiple connecting brackets. Multiple helical blades are fixedly installed on the outer side of the rotating rod.
[0005] As a further optimization of this utility model, the auxiliary conduit is set at an angle of 45°, the bottom end of the auxiliary conduit penetrates the top of the sheath body and communicates with the interior of the sheath body, and the top end of the auxiliary conduit penetrates the side wall of the main conduit and communicates with the interior of the main conduit.
[0006] As a further optimization of this utility model, the rotating rod and the sliding ring are coaxially arranged, and the multiple spiral blades are distributed in a circular array at equal intervals with the rotating rod as the center.
[0007] As a further optimization of this utility model, the height of the spiral blades is adapted to the height of the main pipe, and the outer edges of the multiple spiral blades are all in contact with the inner wall of the main pipe.
[0008] As a further optimization of this utility model, the guiding component includes a guiding ball disposed in the inner cavity of the secondary tube. The guiding ball has a multi-layer composite structure, which includes a honeycomb ball frame, an elastic ball sleeve, and guiding ridges.
[0009] As a further optimization of this utility model, the honeycomb ball frame is located on the innermost side, the elastic ball sleeve is fixedly covered on the outer side of the honeycomb ball frame, and the guiding protrusion is fixedly set on the outer side of the elastic ball sleeve.
[0010] As a further optimization of this utility model, the inner cavity of the secondary conduit is provided with a plurality of fan-shaped limiting blocks arranged in a circumferential array at the bottom, and the outer arc surface of the limiting blocks is fixedly connected to the inner wall of the secondary conduit.
[0011] Compared with the prior art, the beneficial effects of this utility model are: In this invention, the gas and volatile substances are separated by a main and auxiliary pumping circuit. The airflow-driven scraping structure cleans the condensate on the inner wall of the channel in real time. The dynamic guiding component disperses the viscous condensate and prevents it from clumping and blocking. No manual disassembly and cleaning is required, which avoids damage to the sealing performance of the casing caused by frequent disassembly. It effectively prevents the cross-sectional area of the pumping channel from shrinking or becoming blocked, ensures the stable pumping efficiency of the vacuum unit, prevents the desorption process from being interrupted, and improves the continuity and reliability of the desorption operation. Attached Figure Description
[0012] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a cross-sectional view of the main body of the casing of this utility model; Figure 3 This is a schematic diagram of the structure of the main pipe and the auxiliary pipe of this utility model; Figure 4 This is a cross-sectional view of the main pipe and the auxiliary pipe of this utility model; Figure 5 This is an exploded view of the main conduit of this utility model; Figure 6 This utility model Figure 4 Enlarged view of point A; Figure 7 This is a schematic diagram of the structure of the guiding ball of this utility model; Figure 8 This is an exploded view of the structure of the guiding ball of this utility model.
[0013] In the diagram: 1. Encasing body; 2. Main pipe; 3. Scraping assembly; 31. Sliding ring; 32. Rotating rod; 33. Spiral blade; 4. Secondary pipe; 41. Limiting block; 5. Guiding assembly; 51. Guiding ball; 511. Honeycomb ball frame; 512. Elastic ball sleeve; 513. Guiding protrusion. Detailed Implementation
[0014] 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.
[0015] 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.
[0016] Please see Figures 1-8 This utility model provides a technical solution: A vacuum desorption structure for a thermal isostatic pressing (TIP) sheath includes a sheath body 1. A main pipe 2 is fixedly inserted into the top center of the sheath body 1. The top of the main pipe 2 is provided with a connecting flange for connection to an external vacuum unit. A scraping assembly 3 is provided in the inner cavity of the main pipe 2. Auxiliary pipes 4 are symmetrically arranged on both sides of the main pipe 2. A guiding assembly 5 is provided in the inner cavity of the auxiliary pipes 4. The scraping assembly 3 includes a sliding ring 31. The outer diameter of the sliding ring 31 is adapted to the inner diameter of the main pipe 2, and the sliding ring 31 is rotatably connected to the top of the inner cavity of the main pipe 2. A rotating rod 32 is provided below the sliding ring 31. The top end of the rotating rod 32 is fixedly connected to the inner wall of the sliding ring 31 through multiple connecting brackets. Multiple spiral blades 33 are fixedly installed on the outer side of the rotating rod 32.
[0017] It should be noted that: the main body 1 provides a sealed space for the workpiece to be processed in the hot isostatic pressing process; the main pipe 2 at the top center is the core air extraction channel, which is connected to the external vacuum unit through the connecting flange to ensure the negative pressure environment for vacuum desorption; the scraping component 3 is set in the inner cavity of the main pipe 2, which can be self-driven by airflow and clean the condensate on the inner wall of the channel in real time; the symmetrical auxiliary pipes 4 on both sides can divert gas and condensate; and the drainage component 5 can prevent the auxiliary pipes 4 from being blocked. The three work together to solve the problem of easy blockage in traditional channels. As a further implementation of this scheme, the secondary pipe 4 is set at an angle of 45°. The bottom end of the secondary pipe 4 penetrates the top of the sheath body 1 and communicates with the inside of the sheath body 1. The top end of the secondary pipe 4 penetrates the side wall of the main pipe 2 and communicates with the inside of the main pipe 2. It should be noted that the secondary pipe 4 is designed at a 45° angle. This angle facilitates the rapid flow of gas and volatile substances inside the casing body 1. Its bottom end is connected to the inside of the casing body 1, and its top end is connected to the main pipe 2, forming a "main and secondary combined" air extraction circuit, expanding the air extraction coverage area and reducing the probability of condensate accumulation in a single channel. As a further implementation of this scheme, the rotating rod 32 and the sliding ring 31 are coaxially arranged, and multiple spiral blades 33 are distributed in a circular array at equal intervals with the rotating rod 32 as the center. It should be noted that the rotating rod 32 and the sliding ring 31 are coaxially set to ensure that the force is balanced and the trajectory is stable during rotation. The multiple spiral blades 33 are arranged in a circumferential array, which can fully cover the inner cavity cross section of the main pipe 2. This layout allows the spiral blades 33 to form a sweeping motion without dead angles on the inner wall of the main pipe 2 when they are driven to rotate by airflow, so as to remove the condensed solid or viscous substances in time and prevent the channel cross-sectional area from shrinking. As a further implementation of this scheme, the height of the spiral blade 33 is adapted to the height of the main pipe 2, and the outer edges of multiple spiral blades 33 are all in contact with the inner wall of the main pipe 2. It should be noted that the height of the spiral blade 33 is adapted to the main pipe 2, and the outer edge is in contact with the pipe wall to ensure the cleaning effect during scraping and avoid secondary accumulation of residual condensate. During rotation, the spiral blade 33 can also generate upward airflow power to accelerate the flow of the gas and condensate mixture towards the vacuum unit and improve the pumping and desorption efficiency. As a further implementation of this solution, the dredging component 5 includes a dredging ball 51 disposed in the inner cavity of the secondary pipe 4. The dredging ball 51 has a multi-layer composite structure, which includes a honeycomb ball frame 511, an elastic ball sleeve 512 and a dredging protrusion 513. The honeycomb ball frame 511 is located on the innermost side, the elastic ball sleeve 512 is fixedly covered on the outer side of the honeycomb ball frame 511, and the dredging protrusion 513 is fixedly disposed on the outer side of the elastic ball sleeve 512. It should be noted that the guiding ball 51 of the guiding component 5 adopts a multi-layer composite structure. The inner honeycomb ball frame 511 provides stable support and significantly reduces its own weight while ensuring the overall structural strength. The outer elastic ball sleeve 512 has deformation capability. With the guiding ridges 513 on the surface, it can roll or swing under the impact of airflow. This dynamic structure can break up viscous condensate and prevent it from accumulating and clogging in the secondary pipe 4. At the same time, the deformation characteristics of the elastic ball sleeve 512 can adapt to the cleaning needs of condensate in different states. As a further implementation of this solution, the bottom of the inner cavity of the secondary pipe 4 is provided with a plurality of fan-shaped limiting blocks 41 arranged in a circumferential array, and the outer arc surface of the limiting blocks 41 is fixedly connected to the inner wall of the secondary pipe 4. It should be noted that the fan-shaped limiting blocks 41 at the bottom of the inner cavity of the secondary pipe 4 are arranged in a circumferential array. This not only limits the excessive downward movement of the guide ball 51 away from the working area, but also does not block the flow path of gas and condensate. Its outer arc surface is fixed to the inner wall of the secondary pipe 4, ensuring a stable installation without creating dead corners for blockage, and ensuring that the guide ball 51 continues to play an anti-blockage role within the effective range.
[0018] Workflow: Before the vacuum desorption operation begins, the workpiece to be processed is placed inside the enclosure body 1 and sealed. The entire structure is connected to the external vacuum unit through the connecting flange at the top of the main pipe 2. After the vacuum unit is started, a negative pressure environment is formed inside the enclosure body 1. Volatile substances generated at high temperatures during the hot isostatic pressing process (such as residual lubricant and low melting point impurities) will flow into the extraction channel along with the gas. Some of the gas and volatile substances enter the main pipe 2, while the rest are diverted through the secondary pipe 4 set at an angle of 45°, forming a "main and secondary combined" extraction circuit, which effectively disperses the pressure of condensate accumulation. Under the action of airflow, the scraping assembly 3 in the main pipe 2 achieves airflow self-drive: when the gas flows upward, it impacts the spiral blades 33, causing the rotating rod 32 and the sliding ring 31 to rotate along the top of the inner cavity of the main pipe 2. Since the rotating rod 32 and the sliding ring 31 are coaxially arranged, and the spiral blades 33 are distributed in a circular array with the rotating rod 32 as the center, the force is balanced and the trajectory is stable during the rotation. The outer edge of the spiral blades 33 is closely attached to the inner wall of the main pipe 2, and its height is adapted to the main pipe 2. When rotating, it can form a sweeping motion on the pipe wall without dead angles, and promptly remove the solid or viscous substances that have just condensed, avoiding the accumulation of condensate and the reduction of the channel cross-sectional area. At the same time, the rotation of the spiral blades 33 generates upward airflow force, which accelerates the movement of the gas and condensate mixture towards the vacuum unit, further improving the pumping efficiency. During the flow of gas and volatile substances diverted to the secondary pipe 4, they impact the guide ball 51 in the inner cavity. Due to the honeycomb ball frame 511, the guide ball 51 has a significantly reduced weight and can roll or swing along the inner wall of the secondary pipe 4 under the impact of airflow. The outer elastic ball sleeve 512, together with the guide ridges 513 on the surface, can effectively disperse viscous condensate and prevent it from accumulating and clogging inside the pipe. The fan-shaped limiting block 41 at the bottom of the secondary pipe 4 restricts the guide ball 51 from moving too far down and leaving the working area, and does not block the flow path, ensuring that the guide ball 51 continues to play a dynamic guiding role within the effective range. During this process, the 45° inclined design of the secondary pipe 4, with the assistance of gravity, makes it difficult for condensate to remain on the pipe wall, further reducing the risk of blockage. Throughout the desorption process, the scraping component 3 continuously cleans the main pipe 2 through airflow self-drive, while the guiding component 5 dynamically guides the secondary pipe 4. The two work together to prevent condensate from accumulating and clogging, without the need for manual intervention or disassembly and cleaning, ensuring the stable pumping efficiency of the vacuum unit. After the desorption operation is completed, the vacuum unit is shut down, the connecting flange to the main pipe 2 is disconnected, and the workpiece inside the casing body 1 is removed, completing the entire vacuum desorption process.
[0019] 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 vacuum desorption structure for a thermal isostatic pressing cladding, comprising a cladding body (1), characterized in that: The main tube (2) is fixedly inserted at the top center of the casing body (1). The top of the main tube (2) is provided with a connecting flange for connecting to an external vacuum unit. The inner cavity of the main tube (2) is provided with a scraping assembly (3). The two sides of the main tube (2) are symmetrically provided with auxiliary tubes (4). The inner cavity of the auxiliary tubes (4) is provided with a dredging assembly (5). The scraping assembly (3) includes a sliding ring (31), the outer diameter of which is adapted to the inner diameter of the main pipe (2), and the sliding ring (31) is rotatably connected to the top of the inner cavity of the main pipe (2). A rotating rod (32) is provided below the sliding ring (31), and the top end of the rotating rod (32) is fixedly connected to the inner wall of the sliding ring (31) through multiple connecting brackets. Multiple spiral blades (33) are fixedly installed on the outer side of the rotating rod (32).
2. The vacuum desorption structure of a thermal isostatic pressing cladding according to claim 1, characterized in that: The secondary pipe (4) is set at an angle of 45°. The bottom end of the secondary pipe (4) penetrates the top of the sheath body (1) and communicates with the inside of the sheath body (1). The top end of the secondary pipe (4) penetrates the side wall of the main pipe (2) and communicates with the inside of the main pipe (2).
3. The vacuum desorption structure of a thermal isostatic pressing cladding according to claim 1, characterized in that: The rotating rod (32) is coaxially arranged with the sliding ring (31), and the multiple spiral blades (33) are distributed in a circular array at equal intervals with the rotating rod (32) as the center.
4. The vacuum desorption structure of a thermal isostatic pressing cladding according to claim 1, characterized in that: The height of the spiral blades (33) is adapted to the height of the main pipe (2), and the outer edges of the multiple spiral blades (33) are all in contact with the inner wall of the main pipe (2).
5. The vacuum desorption structure of a thermal isostatic pressing cladding according to claim 1, characterized in that: The dredging component (5) includes a dredging ball (51) disposed in the inner cavity of the secondary tube (4). The dredging ball (51) is a multi-layer composite structure, which includes a honeycomb ball frame (511), an elastic ball sleeve (512), and a dredging protrusion (513).
6. The vacuum desorption structure of a thermal isostatic pressing cladding according to claim 5, characterized in that: The honeycomb ball frame (511) is located on the innermost side, the elastic ball sleeve (512) is fixedly covered on the outer side of the honeycomb ball frame (511), and the dredging protrusion (513) is fixedly set on the outer side of the elastic ball sleeve (512).
7. The vacuum desorption structure of a thermal isostatic pressing cladding according to claim 1, characterized in that: The inner bottom of the secondary conduit (4) is provided with a plurality of fan-shaped limiting blocks (41) arranged in a circumferential array, and the outer arc surface of the limiting blocks is fixedly connected to the inner wall of the secondary conduit (4).