A thermal control system for a hot isostatic press

Abstract

The utility model discloses a kind of heat control system suitable for hot isostatic press, including pressure vessel and the peripheral side heating mechanism and bottom heating mechanism being set in the inside of pressure vessel, the intersection of the vertical heating area of bottom heating mechanism top and the internal heating area of peripheral side heating mechanism is working heating area, the difference set of the vertical heating area of bottom heating mechanism top and the internal heating area of peripheral side heating mechanism is transition heating area.The peripheral side heating mechanism includes several parallel partition heating mechanism, container temperature sensor is arranged in the working heating area of the partition heating mechanism, and partition temperature sensor is arranged in the transition heating area of the partition heating mechanism, and standard temperature sensor is arranged in the side of partition temperature sensor close to partition heating mechanism.The utility model is heated by parallel partition, realizes independent accurate heating control, and is combined with bottom heating mechanism, promotes the uniformity of the overall temperature inside pressure vessel, improves the efficiency of heat control, with good practicability.

Description

Technical Field

[0001] This utility model belongs to the technical field of internal heating equipment for hot isostatic presses, specifically relating to a thermal control system suitable for hot isostatic presses. Background Technology

[0002] Hot isostatic pressing (HIP) is a primary equipment for densifying aerospace castings. It is a closed-system device that applies isotropic pressure and high temperatures to materials, allowing for sintering and densification under the high temperature and pressure of HIP. Temperature uniformity is crucial when using HIP to process materials under high temperature and pressure, especially for large and extra-large HIP units, where the large size of the working zone makes achieving uniform furnace temperature more difficult. Currently, achieving temperature uniformity control within the working zone of an HIP is a major challenge in HIP temperature control.

[0003] For example, Chinese patent CN209580635U discloses a device for optimizing the temperature uniformity of a thermostatic press furnace. This device includes a pressure vessel, a heater for heating the working medium outside the pressure vessel, an inlet and outlet for the working medium at the bottom of the pressure vessel, the heater being connected to the inlet and outlet, a pressure booster between the heater and the inlet, and a combined pressure relief valve between the heater and the outlet. This achieves ultra-high pressure and uniform furnace temperature within a temperature range of 200°C and below, meeting the post-processing requirements of special new materials. However, this solution is difficult to implement independent zone control, and as the furnace size of the thermostatic press increases, temperature uniformity becomes increasingly difficult to control. Utility Model Content

[0004] The purpose of this invention is to provide a thermal control system suitable for hot isostatic presses, which aims to achieve independent control of the zoned heating mechanism and precise temperature monitoring of the heating zone inside the pressure vessel.

[0005] This utility model is mainly achieved through the following technical solutions:

[0006] A thermal control system suitable for a hot isostatic press includes a pressure vessel and a peripheral heating mechanism and a bottom heating mechanism disposed inside the pressure vessel. The peripheral heating mechanism is provided on the periphery of the bottom heating mechanism. The intersection of the vertical heating area at the top of the bottom heating mechanism and the internal heating area of ​​the peripheral heating mechanism is the working heating area, and the difference between the vertical heating area at the top of the bottom heating mechanism and the internal heating area of ​​the peripheral heating mechanism is the transition heating area.

[0007] The peripheral heating mechanism includes several parallel partition heating mechanisms arranged sequentially from top to bottom, and the partition heating mechanisms are connected to a heating power supply; a container temperature sensor is installed in the working heating zone of the partition heating mechanism, a partition temperature sensor is installed in the transition heating zone of the partition heating mechanism, and a standard temperature sensor is installed on the side of the partition temperature sensor close to the partition heating mechanism.

[0008] To better realize this utility model, the bottom heating mechanism further includes a base, a heating layer and a frame. The heating layer is suspended at both ends of the top of the base through the frame, and the heating layer is provided with a liquid inlet and a liquid outlet. The heating layer is provided with a heat medium flow cavity inside, and a number of through heat exchange holes are provided on the heating layer along the axial direction.

[0009] To better realize this utility model, further, a number of frames are provided along the periphery between the seat and the heating layer, and the frames are lifting mechanisms.

[0010] To better realize this utility model, it further includes a heat insulation screen. The heat insulation screen is provided inside the pressure vessel. A bottom heating mechanism is provided in the middle of the heat insulation screen, and a peripheral heating mechanism is provided on the periphery. The heat insulation screen is used to isolate the heat transfer between the inside and outside of the pressure vessel.

[0011] To better realize this utility model, the container temperature sensor and the zone temperature sensor are thermocouples, and the standard temperature sensor is a standard thermocouple; the zone heating mechanism includes a heating element, and the heating elements of several zone heating mechanisms are arranged in parallel.

[0012] To better realize this utility model, it further includes a controller and a PID module and a temperature control module connected to the controller respectively. The controller is connected to the container temperature sensor, the zone temperature sensor and the standard temperature sensor respectively. The PID module is used to calculate the dynamic temperature difference between the actual container temperature and the target container temperature. The temperature control module is used to control the heating power supply to provide energy to the heating element.

[0013] The beneficial effects of this utility model are as follows:

[0014] This invention employs a zoned heating mechanism and a bottom heating mechanism to enclose the heating area inside the hot isostatic press. The parallel zoned heating achieves independent and precise heating control. The bottom heating mechanism provides both vertical temperature maintenance and heating, promoting uniform temperature throughout the pressure vessel and improving thermal control efficiency. Furthermore, this invention precisely divides the heating area into a working heating zone and a transition heating zone, enabling accurate measurement of the heating temperature of each zone and the overall temperature inside the vessel. Based on the temperature difference between these two zones, precise and independent heating control of specific zones can be achieved, demonstrating good practicality.

[0015] This invention employs a suspended, porous heating layer design with a bottom heating mechanism, enabling convective heat flow in the heating area and promoting temperature uniformity within the working heating zone. Furthermore, this invention utilizes several lifting mechanisms to adjust the tilt direction of the heating layer, accelerating heat convection in different zones and demonstrating good practicality. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of the thermal control system of the present invention applicable to a hot isostatic press;

[0017] Figure 2 This is a schematic diagram of the internal structure of a pressure vessel;

[0018] Figure 3 This is a schematic diagram of the bottom heating mechanism.

[0019] Wherein: 1-Controller, 2-PID module, 3-Temperature control module, 4-Pressure vessel, 5-Insulation screen, 6-Temperature sensing mechanism, 7-Heating element, 8-Heating power supply, 9-First thermocouple, 10-Second thermocouple, 11-Third thermocouple. Detailed Implementation

[0020] In the description of this utility model, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", and "outer" used to indicate the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship that the utility model product is usually placed in during use. They are only used to facilitate the description of this utility model and to simplify the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0021] Furthermore, the use of terms such as "horizontal" or "vertical" in the description of this utility model does not imply that the component is required to be absolutely horizontal or suspended, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal relative to "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0022] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0023] Example 1:

[0024] A thermal control system suitable for hot isostatic presses, such as Figures 1-3 As shown, the device includes a pressure vessel 4 and a heating assembly and a control assembly disposed inside the pressure vessel 4. The heating assembly is located inside the pressure vessel 4 and is used to raise and measure the real-time temperature inside the pressure vessel 4. The control assembly is located outside the pressure vessel 4 and is used to monitor and control temperature changes inside the pressure vessel 4. The control assembly is prior art and is not the focus of the improvement of this utility model, so it will not be described in detail. A temperature sensing mechanism 6 is correspondingly disposed inside the pressure vessel 4. The temperature sensing mechanism 6 includes a container temperature sensor, a standard temperature sensor, and a zone temperature sensor.

[0025] The heating assembly is used to change the actual temperature of the pressure vessel 4, or to change or maintain the actual temperature within the pressure vessel 4. The heating assembly includes a peripheral heating mechanism and a bottom heating mechanism disposed inside the pressure vessel 4. A peripheral heating mechanism is disposed around the periphery of the bottom heating mechanism. The intersection of the vertical heating area at the top of the bottom heating mechanism and the internal heating area of ​​the peripheral heating mechanism constitutes the working heating area, and the difference between the vertical heating area at the top of the bottom heating mechanism and the internal heating area of ​​the peripheral heating mechanism constitutes the transition heating area. The peripheral heating mechanism includes several partitioned heating mechanisms arranged sequentially from top to bottom, and each partitioned heating mechanism is connected to a heating power supply 8. A container temperature sensor is disposed within the working heating area of ​​each partitioned heating mechanism, and a partitioned temperature sensor is disposed within the transition heating area of ​​each partitioned heating mechanism. A standard temperature sensor is disposed on the side of each partitioned temperature sensor closest to the partitioned heating mechanism.

[0026] like Figure 2As shown, the container temperature sensor, standard temperature sensor, and zone temperature sensor are respectively a first thermocouple 9, a second thermocouple 10, and a third thermocouple 11; the output terminals of the first thermocouple 9, the second thermocouple 10, and the third thermocouple 11 are all connected to the PID module 2. Different thermocouples are distributed at different locations within the pressure vessel 4 to measure the actual temperature at different locations within the pressure vessel 4; the container temperature sensor, standard temperature sensor, and zone temperature sensor are used to measure the container temperature, the zone heating reference temperature, and the zone heating temperature, respectively. Preferably, when there is additional demand, additional thermocouples can be installed at the installation locations of the first thermocouple 9, the second thermocouple 10, and the third thermocouple 11 as spare parts to prevent material damage to the pressure vessel 4 after the hot isostatic press is shut down due to thermocouple failure.

[0027] Preferably, the system further includes a heat insulation screen 5, which is installed in the pressure vessel 4. A heating component is disposed inside the heat insulation screen 5. The heat insulation screen 5 is used to isolate heat transfer between the inside and outside of the pressure vessel 4, thereby maintaining a high-temperature environment inside the pressure vessel 4 and providing heat insulation. Specifically, the temperature sensing mechanism 6 is installed inside the heat insulation screen 5. The zoned heating mechanism includes a heating element 7, which is also placed in the heat insulation screen 5 and is used to change the temperature inside the pressure vessel 4.

[0028] This invention employs a zoned heating mechanism and a bottom heating mechanism to enclose the heating area inside the hot isostatic press. The parallel zoned heating achieves independent and precise heating control. The bottom heating mechanism provides both vertical temperature maintenance and heating, promoting uniform temperature throughout the pressure vessel and improving thermal control efficiency. Furthermore, this invention precisely divides the heating area into a working heating zone and a transition heating zone, enabling accurate measurement of the heating temperature of each zone and the overall temperature inside the vessel. Based on the temperature difference between these two zones, precise and independent heating control of specific zones can be achieved, demonstrating good practicality.

[0029] Preferably, such as Figures 1-3As shown, the bottom heating mechanism includes a base, a heating layer, and a frame. The heating layer is suspended at both ends of the top of the base via the frame, and the heating layer has a liquid inlet and an outlet. The heating layer contains a heat medium flow chamber and has several through-holes arranged axially. Further, several frames are arranged circumferentially between the base and the heating layer, and these frames are lifting mechanisms. The heat medium introduction device inside the heating layer is existing technology, such as the heater and booster structure disclosed in Chinese Patent CN209580635U. This invention uses a suspended, porous heating layer design in the bottom heating mechanism to create convective heat flow in the heating area, promoting temperature uniformity in the working heating zone. Furthermore, this invention allows adjustment of the heating layer's tilt direction via several lifting mechanisms, accelerating heat convection in different zones and demonstrating good practicality.

[0030] Preferably, the control component is used to control the heating component located in the pressure vessel 4, thereby changing the actual temperature inside the pressure vessel 4. The control component includes a controller 1, a PID module 2, and a temperature control module 3. Preferably, the controller 1, PID module 2, and temperature control module 3 are combined and placed outside the pressure vessel 4 to control the internal temperature of the pressure vessel 4. The control component and control method are existing technologies, and users can adapt them during use. Specifically, the controller 1 can collect data from the temperature sensing mechanism 6 to monitor the internal temperature of the pressure vessel 4. Based on the PID module 2, the dynamic temperature difference between the actual container temperature and the target container temperature is calculated. Based on the temperature control module 3, the temperature inside the hot isostatic press pressure vessel 4 is controlled. The heating power supply 8 is placed outside the pressure vessel 4, and provides the heating energy required for the heating element 7 of the heating component.

[0031] During use, this utility model can collect the monitoring temperature inside the pressure vessel 4 of the hot isostatic press through the temperature sensing mechanism 6, accurately measure the heating temperature of each zone and the overall temperature inside the container; based on the dynamic temperature difference between the two temperatures, the temperature control module 3 controls the heating power supply 8 to provide energy to the heating element 7, thereby changing the temperature inside the pressure vessel 4 of the hot isostatic press through the heating element 7.

[0032] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. Any simple modifications or equivalent changes made to the above embodiments based on the technical essence of the present utility model shall fall within the protection scope of the present utility model.

Claims

1. A thermal control system suitable for hot isostatic presses, characterized in that, It includes a pressure vessel (4) and a peripheral heating mechanism and a bottom heating mechanism disposed inside the pressure vessel (4). The peripheral heating mechanism is provided on the periphery of the bottom heating mechanism. The intersection of the vertical heating area at the top of the bottom heating mechanism and the internal heating area of ​​the peripheral heating mechanism is the working heating area. The difference between the vertical heating area at the top of the bottom heating mechanism and the internal heating area of ​​the peripheral heating mechanism is the transition heating area. The peripheral heating mechanism includes several parallel partition heating mechanisms arranged sequentially from top to bottom, and the partition heating mechanism is connected to the heating power supply (8); a container temperature sensor is provided in the working heating zone of the partition heating mechanism, a partition temperature sensor is provided in the transition heating zone of the partition heating mechanism, and a standard temperature sensor is provided on the side of the partition temperature sensor close to the partition heating mechanism.

2. The thermal control system for a hot isostatic press according to claim 1, characterized in that, The bottom heating mechanism includes a base, a heating layer, and a frame. The heating layer is suspended at both ends of the top of the base through the frame, and the heating layer is provided with a liquid inlet and a liquid outlet. The heating layer has a heat medium flow cavity inside, and several through heat exchange holes are provided on the heating layer along the axial direction.

3. A thermal control system suitable for a hot isostatic press according to claim 2, characterized in that, Several frames are arranged along the periphery between the seat and the heating layer, and the frames are lifting mechanisms.

4. A thermal control system suitable for a hot isostatic press according to any one of claims 1-3, characterized in that, It also includes a heat insulation screen (5), which is provided inside the pressure vessel (4). The heat insulation screen (5) has a bottom heating mechanism in the middle and a circumferential heating mechanism on its periphery. The heat insulation screen (5) is used to isolate the heat transfer between the inside and outside of the pressure vessel (4).

5. A thermal control system suitable for a hot isostatic press according to claim 4, characterized in that, The container temperature sensor and the zone temperature sensor are thermocouples, and the standard temperature sensor is a standard thermocouple; the zone heating mechanism includes a heating element (7), and the heating elements (7) of several zone heating mechanisms are connected in parallel.

6. A thermal control system for a hot isostatic press according to claim 1, characterized in that, It also includes a controller (1) and a PID module (2) and a temperature control module (3) connected to the controller (1) respectively. The controller (1) is connected to a container temperature sensor, a zone temperature sensor and a standard temperature sensor respectively. The PID module (2) is used to calculate the dynamic temperature difference between the actual container temperature and the target container temperature. The temperature control module (3) is used to control the heating power supply (8) to provide energy to the heating element (7).

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