An in-kettle temperature equalization system and vertical supercritical foaming kettle

Abstract

A kind of in-kettle temperature equalization system and vertical supercritical foaming kettle, including gas circulation device and magnetic drive device, gas circulation device includes air guide cover, air guide impeller being arranged in the air guide cover, and circulation air pipe being communicated with air guide cover side wall;Air guide cover bottom is equipped with air guide port, circulation air pipe one end is connected with the side wall of air guide cover, its other end extends downward;Magnetic drive device includes drive motor, outer magnetic rotor, inner magnetic rotor and impeller rotating shaft;Outer magnetic rotor is driven by magnetic coupling to drive inner magnetic rotor to drive impeller rotating shaft synchronous rotation.The in-kettle temperature equalization system is combined with vertical supercritical foaming kettle by mounting hole, the upper end opening of mounting hole is sealed by high-pressure sealing pad, the utility model can solve the problem of poor temperature uniformity in foaming kettle in prior art, can significantly improve the stability of temperature in the working process of kettle body including supercritical foaming kettle etc., ensure product quality.

Description

Technical Field

[0001] This utility model belongs to the technical field of supercritical foaming equipment, specifically relating to an internal temperature equalization system and a vertical supercritical foaming reactor. Background Technology

[0002] Supercritical foaming technology uses supercritical fluids as foaming agents to foam polymers and other materials under high temperature and high pressure, and is widely used in the field of material foaming. During the foaming process, the uniformity of temperature inside the foaming vessel plays a decisive role in the key properties of the foamed product, such as density and cell structure.

[0003] Existing vertical supercritical foaming reactors mostly use jacket heating or internal coil heating to control temperature. However, due to the heat transfer characteristics of supercritical fluids and the limited space inside the reactor, uneven temperature distribution is easily caused: the temperature is higher in areas near the heating elements and lower in areas farther away. This results in poor temperature uniformity in the mixture of the supercritical fluid and the material to be foamed, thus affecting foaming consistency and causing fluctuations in product quality. In addition, the foaming reactor operates under high pressure. How to ensure high-pressure sealing while achieving internal medium circulation is also a technical challenge that urgently needs to be solved. Utility Model Content

[0004] To address the aforementioned technical problems, this utility model provides an internal temperature equalization system and a vertical supercritical foaming reactor, which can solve the problems of poor temperature uniformity and difficulty in balancing high-pressure sealing and medium circulation drive in the prior art. It features good internal temperature uniformity and reliable sealing, which can significantly improve the temperature stability of the supercritical foaming process and ensure the quality of foamed products.

[0005] The present invention adopts the following technical solution:

[0006] An internal temperature equalization system includes a gas circulation device and a magnetic drive device. The gas circulation device includes a gas duct, a gas impeller disposed inside the gas duct, and a circulation duct communicating with the side wall of the gas duct. The bottom of the gas duct is provided with a gas inlet, the lower edge of which is lower than the lower edge of the gas impeller. One end of the circulation duct is connected to the side wall of the gas duct, and the other end extends downward, with the lower edge of the circulation duct lower than the lower edge of the gas duct.

[0007] The magnetic drive device includes a power input mechanism located outside the vessel and a power output mechanism located inside the vessel; the power input mechanism includes a drive motor and an outer magnetic rotor, and the power output mechanism includes an inner magnetic rotor and an impeller shaft; the drive motor is used to drive the outer magnetic rotor to rotate, and the outer magnetic rotor drives the inner magnetic rotor to rotate synchronously through magnetic coupling; the inner magnetic rotor is connected to the impeller shaft to drive its rotation, and the impeller shaft is connected to the induced draft impeller.

[0008] Through the above technical solution, this invention serves as a built-in temperature equalization system within the reactor. By combining a built-in gas circulation device with a magnetic drive device, it achieves the circulation of the gaseous medium inside the reactor. Specifically, this invention features a gas circulation device equipped with an air duct containing an air duct impeller. Driven by the magnetic drive device, the air duct impeller rotates, drawing the gaseous medium from the reactor into the air duct through the air inlet, flowing upwards, and then exiting through a side circulation duct to return to the vicinity of the material inside the reactor, forming a gaseous medium circulation. This circulation process forcibly disturbs the flow of the medium inside the reactor, effectively breaking down temperature stratification, significantly improving the temperature uniformity within the reactor, ensuring consistent heating of the material from top to bottom, and significantly enhancing the temperature uniformity of the foaming process and the consistency of product quality.

[0009] Preferably, the induced draft hood is a cylindrical hood with a cylindrical induced draft neck at the bottom, the bottom opening of which forms an induced draft port for drawing in gas from the vessel. Multiple exhaust ports for gas circulation are circumferentially opened on the sidewalls of the induced draft hood, and the circulating air duct communicates with the interior of the induced draft hood through these exhaust ports. The top of the induced draft hood is provided with an induced draft cover, which has a shaft hole adapted to the impeller shaft. Connecting wings for connecting to the vessel body are provided on both sides of the induced draft cover.

[0010] Through the above technical solutions, this utility model designs an air intake hood with an air intake neck, a top air intake cover, multiple circumferentially distributed exhaust ports, and an air intake cover with a shaft hole, which together optimize the gas circulation and temperature control capabilities of the system. Specifically, the air intake neck structure with a narrowed inner diameter at the bottom can effectively guide and enhance the intake of gas in the lower middle part of the vessel; the top air intake cover can maintain stable pressure inside the air intake hood, prevent gas medium from dissipating, and ensure circulation power; the circumferentially distributed exhaust ports and the circulating air ducts connected to them realize the multi-path, uniform, and smooth return of the intake gas to the material area, significantly improving the uniformity of temperature distribution.

[0011] Preferably, the side wall of the air hood has 2 to 8 exhaust ports, more preferably 3 to 6.

[0012] Preferably, the connecting wing has a pre-drilled temperature measuring hole for installing the temperature measuring sleeve inside the vessel.

[0013] Through the above technical solution, the temperature measuring hole set on the gas venting cover provides a structural basis for installing the temperature sensor inside the vessel, which facilitates real-time monitoring of the temperature inside the vessel, can accurately control the impeller speed, and achieve scientific and dynamic temperature control.

[0014] Preferably, the circulating air duct includes a transition section connected to the air intake hood and a vertically downward extending exhaust section. Multiple side exhaust holes are opened on the side wall of the exhaust section, and an exhaust guide plate that extends spirally along the axial direction is provided inside the exhaust section.

[0015] Through the above technical solution, the circulating air duct is designed as a combination of a transition section and an exhaust section, further optimizing the exhaust distribution and airflow pattern. Specifically, multiple side exhaust holes opened along the side wall of the vertical exhaust section allow the extracted gas medium to be released evenly at multiple points along the height of the material, effectively improving the range of temperature regulation within the vessel and avoiding the airflow concentration and temperature unevenness that may result from a single bottom outlet. The axially arranged spiral exhaust guide plate inside the exhaust section guides the airflow to rotate downwards along the pipe wall, ensuring that the gas is discharged more smoothly and evenly from each side exhaust hole, enhancing the mixing efficiency between the airflow and the surrounding material, and extending the flow path and residence time of the gas in the pipe, promoting the homogenization of the gas temperature itself, and significantly improving the temperature uniformity and stability of the entire material area.

[0016] Preferably, the air-expelling impeller is either a centrifugal impeller or an axial flow impeller.

[0017] Through the above technical solutions, when a centrifugal impeller is used, it has strong pressurization capacity and large suction negative pressure, which can stably draw in gas from the reactor and provide sufficient power for the circulating airflow. This ensures that the gas can circulate within the reactor through the circulating air duct, achieving precise temperature homogenization in a small-volume reactor. Furthermore, its structure is mature, its failure rate is low, and it is well-compatible with magnetic drive devices. When an axial flow impeller is used, its gas circulation flow rate is large, which can quickly complete gas replacement and mixing in the entire area of ​​a large-volume reactor, significantly shortening the temperature equalization cycle and making it suitable for large-scale foaming production. Its smooth axial inlet and outlet flow pattern reduces the impact of airflow on the billet in the reactor's material frame, avoiding billet displacement or morphological damage and ensuring product molding consistency. Its compact structure can also be well-compatible with existing magnetic drive devices and air hood channels, allowing for assembly without significant modifications.

[0018] A vertical supercritical foaming reactor includes the above-described internal temperature equalization system.

[0019] Preferably, the top of the foaming kettle is provided with a mounting hole, the impeller shaft is rotatably disposed in the mounting hole, the lower end of the impeller shaft is connected to the air induced impeller, the upper end of the impeller shaft is connected to the inner magnetic rotor, a high-pressure sealing gasket is provided at the upper opening of the mounting hole, and the power input mechanism of the magnetic drive device is fixed to the top of the foaming kettle through a flange, thereby achieving a leak-free connection with static sealing.

[0020] The internal temperature equalization system of this invention can circulate the gas medium inside the reactor in an overall vertical flow direction under the action of the air-inducing impeller, making it particularly suitable for vertical supercritical foaming reactors. Through the above technical solution, the vertical supercritical foaming reactor of this invention achieves power transmission via magnetic coupling. The outer magnetic rotor and the inner magnetic rotor can rotate synchronously without contact. The power input mechanism of the magnetic drive device is fixed to the top of the foaming reactor via a flange, and a high-pressure sealing gasket is installed at the upper end of the mounting hole. By adopting a combination structure of magnetic drive and high-pressure sealing gasket, non-contact power transmission is achieved while reliably ensuring sealing performance under high-pressure conditions, avoiding the risk of high-pressure medium leakage, and meeting the requirements of supercritical foaming reactors and other reaction vessels in high-pressure environments.

[0021] Preferably, it also includes a material frame for holding materials, the top of which is open, and ventilation holes are provided on its side walls and bottom.

[0022] Through the above technical solution, the open structure at the top of the material frame facilitates the efficient extraction of gas above the material by the air intake device, ensuring smooth circulation; the evenly distributed ventilation holes along the circumference and axial direction of the side wall of the material frame allow the temperature-balanced medium discharged through the circulating air duct to penetrate the material layer from all directions and at multiple angles, greatly increasing the contact area and uniformity between the gas and the material, thereby significantly improving the efficiency of heat transfer and the uniformity of material heating.

[0023] Preferably, the inner wall of the foaming kettle is provided with a heat insulation layer, which can reduce the heat exchange between the inside of the kettle and the outside environment and help maintain temperature stability. Attached Figure Description

[0024] Figure 1 This is the overall structural intent of this utility model.

[0025] Figure 2 This is the structural intent of the air duct of this utility model.

[0026] Figure 3 This is a schematic diagram of the structure of the circulating air duct of this utility model.

[0027] Figure 4 This is a schematic diagram of the air intake impeller of this utility model.

[0028] Figure 5 This is a schematic diagram of the material frame of this utility model.

[0029] Figure 6 for Figure 1 A magnified view of a portion of region A in the middle.

[0030] In the figure, 1-foaming kettle body; 2-air duct; 2a-air duct port; 2b-air duct neck; 2c-air duct cover; 2d-exhaust port; 2e-connecting wing; 2f-temperature measuring hole; 3-air duct impeller; 4-circulating air duct; 4a-transfer section; 4b-exhaust section; 4c-exhaust hole; 4d-exhaust guide plate; 5-drive motor; 6-inner magnetic rotor; 7-impeller shaft; 8-temperature measuring sleeve; 9-high pressure sealing gasket; 10-flange; 11-material frame; 11a-vent hole. Detailed Implementation

[0031] This embodiment provides a vertical supercritical foaming reactor with the internal temperature equalization system described in this utility model. It includes a foaming reactor body 1 for containing the material to be foamed and the supercritical medium, a gas circulation device, and a magnetic drive device. The gas circulation device includes an air duct 2, an air duct impeller 3 disposed within the air duct 2, and a circulation duct 4 communicating with the side wall of the air duct 2. An air duct port 2a is provided at the bottom of the air duct 2, and the lower edge of the air duct port 2a is lower than the lower edge of the air duct impeller 3. One end of the circulation duct 4 is connected to the side wall of the air duct 2, and the other end extends downwards, with the lower edge of the circulation duct 4 lower than the lower edge of the air duct 2.

[0032] The magnetic drive device includes a power input mechanism located outside the vessel and a power output mechanism located inside the vessel. The power input mechanism includes a drive motor 5 and an outer magnetic rotor, and the power output mechanism includes an inner magnetic rotor and an impeller shaft. The drive motor 5 is used to drive the outer magnetic rotor to rotate. The outer magnetic rotor drives the inner magnetic rotor 6 to rotate synchronously through magnetic coupling. The inner magnetic rotor 6 is connected to the impeller shaft 7 to drive its rotation. The impeller shaft 7 is connected to the induced draft impeller 3. In this embodiment, the induced draft impeller 3 is a centrifugal impeller, which has a strong pressurization capacity inside the vessel and can provide sufficient power for the circulating airflow.

[0033] In this embodiment, the induced draft hood 2 is a cylindrical hood with a cylindrical induced draft neck at its bottom, the bottom of which has an inner diameter smaller than that of the induced draft hood 2b. The bottom opening of the induced draft neck 2b forms an induced draft port for the intake of gas from the vessel. Multiple exhaust ports 2d for gas circulation are circumferentially opened on the side wall of the induced draft hood 2. The circulation duct 3 communicates with the interior of the induced draft hood through the exhaust ports 2d. To enhance the temperature uniformity, 2 to 8 exhaust ports can be opened circumferentially on the side wall of the induced draft hood, preferably 3 to 6. In this embodiment, 4 exhaust ports 2d are opened, each connected to 4 circulation ducts 4. The top of the induced draft hood is sealed by an induced draft cover 2c. The induced draft cover 2c has a shaft hole adapted to the impeller shaft 6. Connecting wings 2e for connecting to the vessel body are provided on both sides of the induced draft cover 2c. Temperature measuring holes 2f are reserved on the connecting wings 2e for installing the temperature measuring sleeve 8 inside the vessel.

[0034] In this embodiment, the preferred structure of the circulating air duct is that the circulating air duct 4 includes a transition section 4a connected to the air intake hood 2 and an exhaust section 4b extending vertically downward. Multiple side exhaust holes 4c are opened on the side wall of the exhaust section 4b, and an exhaust guide plate 4d extending spirally along the axial direction is provided inside the exhaust section 4b.

[0035] In this embodiment, the temperature equalization system inside the foaming vessel is coupled with the foaming vessel body as follows: The top of the foaming vessel body 1 has a mounting hole, and the impeller shaft 7 is rotatably mounted within the mounting hole. The lower end of the impeller shaft 7 is connected to the air induced impeller 3, and the upper end of the impeller shaft 7 is connected to the internal magnetic rotor 6. A high-pressure sealing gasket 9 is provided at the upper opening of the mounting hole. The power input mechanism of the magnetic drive device is fixed to the top of the foaming vessel body 1 via a flange 10. In this embodiment, the high-pressure sealing gasket 9 uses high-pressure resistant sealing elements such as metal spiral wound gaskets and rubber-reinforced gaskets, which can achieve a high-pressure seal at the top of the vessel body.

[0036] In this embodiment, the foaming kettle body 1 is also provided with a material frame 11 for holding materials. The top of the material frame 11 is open, and a vent hole 11a is opened on its side wall. In order to reduce the heat exchange between the inside of the kettle and the outside and to help maintain temperature stability, a heat insulation layer is provided on the inner wall of the foaming kettle body 1. A heating jacket is provided on the outside, and the jacket is provided with a heating medium heat transfer oil inlet and outlet. A gas inlet valve is provided on the foaming kettle body.

[0037] Work process:

[0038] When the temperature inside the foaming reactor body 1 needs to be balanced, the drive motor 5 of the magnetic drive device is activated. The drive motor 5 drives the outer magnetic rotor to rotate, and the outer magnetic rotor drives the inner magnetic rotor 6 to rotate synchronously through magnetic transmission. The inner magnetic rotor 6 drives the air induced impeller 3 to rotate, forming a dynamic field above the air induced hood 2. This causes the medium in the lower part of the foaming reactor body 1 to enter from the air induced port 2a, flow upward along the air induced hood 2, and reach the air induced impeller 3 through the air induced neck 2b. Driven by the air induced impeller 3, the medium diffuses in all directions and is discharged from the exhaust port 2d. Due to gravity and the flow field inside the reactor, the discharged medium flows back to the lower part of the reactor through the circulating air duct 4, forming forced circulation, breaking up temperature stratification, and making the temperature inside the reactor tend to be balanced.

[0039] This embodiment effectively solves the problems of poor temperature uniformity and difficulty in balancing high-pressure sealing and circulation drive in existing supercritical foaming kettles through the above structure and process, and has significant practical value.

Claims

1. A temperature equalization system inside a vessel, characterized in that: The device includes a gas circulation device and a magnetic drive device. The gas circulation device includes a gas duct, a gas impeller disposed inside the gas duct, and a circulation duct communicating with the side wall of the gas duct. The bottom of the gas duct is provided with a gas inlet, and the lower edge of the gas inlet is lower than the lower edge of the gas impeller. One end of the circulation duct is connected to the side wall of the gas duct, and the other end extends downward, with the lower edge of the circulation duct lower than the lower edge of the gas duct. The magnetic drive device includes a power input mechanism located outside the vessel and a power output mechanism located inside the vessel; the power input mechanism includes a drive motor and an outer magnetic rotor, and the power output mechanism includes an inner magnetic rotor and an impeller shaft; the drive motor is used to drive the outer magnetic rotor to rotate, and the outer magnetic rotor drives the inner magnetic rotor to rotate synchronously through magnetic coupling; the inner magnetic rotor is connected to the impeller shaft to drive its rotation, and the impeller shaft is connected to the induced draft impeller.

2. The in-vessel temperature equalization system according to claim 1, characterized in that: The induced draft hood is a cylindrical hood with a cylindrical induced draft neck at its bottom, the bottom of which has an inner diameter smaller than that of the induced draft hood. The bottom opening of the induced draft neck forms an induced draft port for drawing in gas from the vessel. Multiple exhaust ports for gas circulation are circumferentially opened on the side wall of the induced draft hood, and the circulating air duct communicates with the interior of the induced draft hood through the exhaust ports. The top of the induced draft hood is sealed by an induced draft cover, which has a shaft hole adapted to the impeller shaft. Connecting wings for connecting to the vessel body are provided on both sides of the induced draft cover.

3. The in-vessel temperature equalization system according to claim 2, characterized in that: The side wall of the vent hood has 2 to 8 exhaust ports circumferentially.

4. The in-vessel temperature equalization system according to claim 2, characterized in that: The connecting wing has a pre-drilled temperature measuring hole for installing the temperature measuring sleeve inside the vessel.

5. The in-vessel temperature equalization system according to claim 1, characterized in that: The circulating air duct includes a transition section connected to the air intake hood and an exhaust section extending vertically downward. Multiple side exhaust holes are opened on the side wall of the exhaust section, and an exhaust guide plate extending spirally along the axial direction is provided inside the exhaust section.

6. The in-vessel temperature equalization system according to claim 1, characterized in that: The air-expelling impeller is either a centrifugal impeller or an axial flow impeller.

7. A vertical supercritical foaming reactor, characterized in that: Includes the in-vessel temperature equalization system as described in any one of claims 1-6.

8. A vertical supercritical foaming reactor according to claim 7, characterized in that: The top of the foaming kettle is provided with a mounting hole, and the impeller shaft is rotatably installed in the mounting hole. The lower end of the impeller shaft is connected to the air induced impeller, and the upper end of the impeller shaft is connected to the inner magnetic rotor. A high-pressure sealing gasket is provided at the upper opening of the mounting hole. The power input mechanism of the magnetic drive device is fixed to the top of the foaming kettle through a flange.

9. A vertical supercritical foaming reactor according to claim 7, characterized in that: It also includes a material frame for holding materials, the top of which is open and the side walls and bottom of which have ventilation holes.

10. A vertical supercritical foaming reactor according to claim 7, characterized in that: The inner wall of the foaming kettle is provided with a heat insulation layer.

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