Gas flow generating device and hot isostatic pressing apparatus
By installing a gas flow generator inside the hot isostatic pressing equipment and using an external gas compressor to introduce high-speed gas, the problem of slow cooling speed caused by excessive heat insulation performance of the heat insulation screen is solved, achieving more efficient production and reducing manufacturing costs.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- CISRI HIPEX TECHNOLOGY CO LTD
- Filing Date
- 2025-04-30
- Publication Date
- 2026-07-24
AI Technical Summary
In existing hot isostatic pressing equipment, the excessive heat insulation performance of the heat shield results in a slow cooling rate in the upper area, which affects production efficiency and increases manufacturing costs.
A gas flow generating device is installed inside the hot isostatic pressing equipment, including a shell, a gas ejector and a gas disperser. High-speed gas is introduced through an external gas compressor, which causes the gas in the high-temperature area above the equipment to flow downwards. The gas flow generating device is used to discharge the hot gas from the area above the equipment.
It effectively prevents high-temperature gas from accumulating in the upper area, reduces temperature, improves temperature uniformity in the working area and equipment reliability, reduces potential hazards to workpieces or equipment, lowers manufacturing costs and improves production efficiency.
Smart Images
Figure CN224543130U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of hot isostatic pressing equipment technology, and more specifically, to a gas flow generating device and a hot isostatic pressing equipment. Background Technology
[0002] Hot isostatic pressing (HIP) is a process that applies high pressure (50-207 MPa) and high temperature (up to 1400-2500℃) simultaneously within a specialized pressure vessel, thereby sintering and densifying the workpiece. The pressure is typically applied using inert gases such as nitrogen or argon. The dispersion of the gas creates an isobaric environment within the equipment. Under these high temperature and pressure conditions, defects or pores within the solid metal can be eliminated, and interfacial diffusion bonding can occur. This allows for complete densification of the encapsulated powder and the sintered part, improving mechanical properties. In situations where special or conventional processes are difficult to achieve, such as large powder metallurgy semi-finished products or large powder metallurgy parts weighing several tons, HIP is the only feasible manufacturing method.
[0003] During equipment operation, the heat continuously introduced by the heater causes the gas inside the working area to heat up, thereby reducing its density and causing the gas to flow upwards. This results in the accumulation of hot gas at the top of the working area, which may cause the temperature in the upper area to rise, and in severe cases, even damage the workpiece being processed.
[0004] In existing hot isostatic pressing (HIP) equipment, to address the issue of excessively high temperatures in the upper region, the thickness of the top cover above the heat shield is typically increased to improve insulation performance and prevent potential damage from temperature fluctuations in the upper high-temperature region. However, this method increases manufacturing costs, and the excessive insulation performance of the heat shield leads to slower cooling in the upper region, thus impacting production efficiency. Utility Model Content
[0005] The purpose of this application is to provide a gas flow generating device and a hot isostatic pressing device to solve the problem in the prior art that the cooling rate of the upper area is slow due to the excessive heat insulation performance of the heat insulation screen, which affects production efficiency and increases manufacturing costs.
[0006] Based on this, in a first aspect, this application provides a gas flow generating device applied to a hot isostatic pressing (HIP) device. The generating device includes: a housing; a gas ejector, which is a tubular structure and is fixedly installed through the housing; the gas ejector includes an ejector inlet pipe, an ejector mixing pipe, and an ejector contraction pipe of the same outer diameter; one end of the ejector mixing pipe is connected to the ejector inlet pipe, and the other end is connected to the ejector contraction pipe; a gas disperser, fixedly installed in the housing; the gas disperser has an airflow channel; the air inlet of the airflow channel is located at one end of the gas disperser; a gas baffle is located at the other end of the gas disperser; and the air outlet of the airflow channel is located around the gas baffle; a nozzle is located at the end of the ejector contraction pipe, and the nozzle faces the air inlet.
[0007] In conjunction with the gas flow generating device of the first aspect, the first end face of the gas baffle is conical, and the first end face serves as the wall of the airflow channel, while the second end face of the gas baffle is planar.
[0008] In conjunction with the gas flow generating device of the first aspect, the first end face is a conical surface, and the apex of the first end face is directly opposite the air inlet.
[0009] In conjunction with the gas flow generating device of the first aspect, the inner diameter of the ejector mixing tube has a first conical channel, and the inner diameter of the first conical channel gradually increases in the direction away from the ejector inlet tube.
[0010] In conjunction with the gas flow generating device of the first aspect, a cylindrical channel is connected to the first conical channel in the inner diameter of the ejector mixing tube, and the diameter of the cylindrical channel is the same as the bottom diameter of the first conical channel.
[0011] In conjunction with the gas flow generating device of the first aspect, a second conical channel is also provided in the inner diameter of the ejector mixing tube, and the inner diameter of the second conical channel gradually increases along the direction close to the ejector inlet tube.
[0012] In conjunction with the gas flow generating device of the first aspect, a connecting channel is also provided in the inner diameter of the ejector mixing tube, and the two ends of the connecting channel are respectively connected to the first conical channel and the second conical channel.
[0013] In conjunction with the gas flow generating device of the first aspect, the connecting channel is a columnar channel.
[0014] In conjunction with the gas flow generating device of the first aspect, the inlet of the gas disperser is cylindrical, the second end face of the gas baffle is circular, and the outlet is an annular opening.
[0015] Secondly, this application provides a hot isostatic pressing device, including a gas flow generating device as described above, wherein the gas flow generating device is fixedly disposed at the bottom of the inner cavity of the hot isostatic pressing device.
[0016] The beneficial effects of the gas flow generating device provided in this application are at least as follows: This application incorporates a gas flow generating device inside a hot isostatic pressing (HIP) device. An external gas compressor introduces high-speed gas into the HIP device, causing the gas in the high-temperature region above the device to flow downwards. This effectively discharges hot gas from the upper region, preventing its accumulation and reducing the temperature there, thus minimizing potential damage to the workpiece or equipment. This not only improves the temperature uniformity of the working area but also enhances the reliability of the equipment, ensuring stable operation and performance. This application solves the problem in existing technologies where excessive heat insulation from the heat shield leads to slow cooling in the upper region, affecting production efficiency and increasing manufacturing costs. Attached Figure Description
[0017] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0018] Figure 1 This is a cross-sectional structural schematic diagram of a gas flow generating device provided in an embodiment of this application;
[0019] Figure 2 This is a schematic diagram of the installation structure of a gas ejector provided in an embodiment of this application;
[0020] Figure 3 This is a schematic cross-sectional view of a gas disperser provided in an embodiment of this application;
[0021] Figure 4 This is a cross-sectional structural schematic diagram of a gas ejector provided in an embodiment of this application.
[0022] The following are the labeling elements in the figure:
[0023] 1. Shell; 2. Gas ejector; 3. Gas disperser; 4. Lower plug; 21. Ejector inlet pipe; 22. Ejector mixing pipe; 23. Ejector contraction pipe; 31. Gas baffle; 32. Air inlet; 33. Air outlet; 221. Column channel; 222. First conical channel; 223. Connecting channel; 224. Second conical channel; 311. First end face; 312. Second end face. Detailed Implementation
[0024] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of this application.
[0025] It should be noted that when a component is referred to as "fixed to" or "set on" another component, it may be directly or indirectly located on that other component. When a component is referred to as "connected to" another component, it may be directly or indirectly connected to that other component. The terms "upper," "lower," "left," "right," "front," "rear," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate orientations or positions based on the accompanying drawings, and are for ease of description only, and should not be construed as limiting the technical solution. The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features. "A plurality" means two or more, unless otherwise explicitly defined.
[0026] Hot isostatic pressing (HIP) is a process that uses a specialized pressure vessel to simultaneously apply high pressure (50-207 MPa) and high temperature (up to 1400-2500°C) to sinter and densify parts. The pressure is typically applied using inert gases such as nitrogen or argon. The dispersion of these gases creates an isobaric environment within the equipment. Under these high temperature and pressure conditions, defects or pores within solid metals can be eliminated, and interfacial diffusion bonding can occur. This allows for complete densification of the encapsulated powder and sintered parts, improving mechanical properties. HIP is the only feasible manufacturing method for special or conventional processes that are difficult to form, such as large powder metallurgy semi-finished products or large powder metallurgy parts weighing several tons. During equipment operation, the heat continuously introduced by the heater causes the gas inside the working area to heat up, reducing its density and causing it to flow upwards. This leads to the accumulation of high-temperature gas at the top of the working area, which may cause the temperature in the upper region to rise, and in severe cases, even damage to the workpiece.
[0027] In existing hot isostatic pressing (HIP) equipment, gas-driven applications are relatively rare. Typically, to address the issue of excessively high temperatures in the upper region, a common solution is to increase the thickness of the top cover above the heat shield to improve insulation performance and prevent potential damage from temperature fluctuations in the upper high-temperature region. However, this traditional solution has some drawbacks, including increased manufacturing costs and slower cooling rates in the upper region due to excessive insulation, thus impacting production efficiency.
[0028] To overcome the shortcomings of existing equipment technology, this application provides a gas flow generating device for use in hot isostatic pressing equipment, such as... Figure 1-4 As shown, the gas flow generating device includes: a housing 1; a gas ejector 2, a tubular structure, which is fixed to the housing 1; the gas ejector 2 includes an ejector inlet pipe 21 with the same outer diameter, an ejector mixing pipe 22, and an ejector contraction pipe 23; one end of the ejector mixing pipe 22 is connected to the ejector inlet pipe 21, and the other end is connected to the ejector contraction pipe 23; a gas disperser 3, fixedly installed in the housing 1; the gas disperser 3 has an airflow channel; the air inlet 32 of the airflow channel is located at one end of the gas disperser 3; a gas baffle 31 is located at the other end of the gas disperser 3; and the air outlet 33 of the airflow channel is located around the gas baffle 31. A nozzle is located at the end of the ejector contraction pipe 23, and the nozzle faces the air inlet 32.
[0029] Specifically, in this embodiment, the gas flow generating device can be installed inside the thermal isostatic pressing (HIP) equipment. The gas flow generating device comprises three main parts: a housing 1, a gas ejector 2, and a gas disperser 3. The housing 1 protects the gas ejector 2 and the gas disperser 3 and provides installation space for them. The gas ejector 2 is fixed through the housing 1, meaning it can pass through the wall of the housing 1 and is fixed to it. The gas ejector 2 is used to introduce high-speed gas generated by an external high-speed gas generating device (e.g., a high-pressure gas compressor) into the HIP equipment. The high-speed gas can be an inert gas, such as argon.
[0030] The gas ejector 2 consists of three parts: an ejector inlet pipe 21, an ejector mixing pipe 22, and an ejector contraction pipe 23. The outer diameters of the ejector inlet pipe 21, the ejector mixing pipe 22, and the ejector contraction pipe 23 are the same, while their inner diameters differ. One end of the ejector mixing pipe 22 is connected to the ejector inlet pipe 21, and the other end is connected to the ejector contraction pipe 23. The airflow channels inside all three are interconnected.
[0031] The function of the gas disperser 3 is to evenly disperse the high-speed airflow introduced into the hot isostatic press, thereby slowing down and diffusing the airflow.
[0032] It is important to note that within the internal space of housing 1, the introduced high-speed gas is first mixed with the high-temperature gas inside the thermal isostatic pressing (HIP) device. This increases the temperature of the gas entering the HIP device from the outside, reducing the temperature difference between the external gas and the high-temperature gas inside the HIP device. The aim is to minimize the impact of low-temperature gas entering the internal area of the HIP device on the operating temperature.
[0033] This embodiment can be applied to a gas ejector 2 and its matching gas disperser 3 under high temperature and high pressure conditions. The gas ejector 2 includes an ejector inlet that cooperates with the gas source and a gas flow device with a Laval nozzle structure. In conventional equipment, the gas temperature rise caused by continuous heating is a necessary step in the processing. The gas inevitably rises due to thermal expansion, which leads to a continuous increase in the temperature of the working area, potentially damaging the workpiece and the equipment. The presence of the gas flow generating device drives the high-temperature gas from the upper region away. This driving force pushes the gas downward along the inner wall insulation section. During use, the ejector inlet pipe 21 located below the gas flow generator is connected to the air hole on the lower plug body 4 of the hot isostatic pressing device. The air hole connected to the high-pressure compressor introduces the high-pressure ejector gas flow into the gas flow generator. Under the acceleration drive of the ejector acceleration section with Laval nozzle structure, the gas disperser 3 generates an overall upward driving force. The existence of this driving force causes the gas in the internal working area to have an upward flow tendency similar to a piston, thereby driving the upper gas to move downward and finally flow out of the working area through the opening of the heat insulation device for cooling.
[0034] Compared with existing technologies, this embodiment not only effectively reduces equipment manufacturing costs but also provides faster cooling of the working area under high temperature and high pressure environments by promoting gas circulation, thereby improving equipment performance and production efficiency. This solution enables more effective management and control of the high-temperature, high-pressure gas above the thermal isostatic pressing equipment without relying on traditional methods that increase the thickness of the heat shield. This not only reduces manufacturing costs but also improves equipment operability and production efficiency, making it more competitive and sustainable.
[0035] In some embodiments, the first end face 311 of the gas baffle 31 is conical and serves as the wall of the airflow channel, while the second end face 312 of the gas baffle 31 is planar.
[0036] Specifically, in this embodiment, the first end face 311 can be conical or smoothly streamlined, with the aim of dispersing the gas evenly and minimizing wind resistance. The high-speed gas, through the action of the gas baffle 31, can have its flow velocity reduced and enter the hot isostatic pressing equipment evenly.
[0037] In some embodiments, the first end face 311 is a conical surface, and the apex of the first end face 311 is directly opposite the air inlet 32.
[0038] In some embodiments, the inner diameter of the ejector mixing tube 22 has a first tapered channel 222, the inner diameter of which gradually increases along the direction away from the ejector inlet tube 21. A cylindrical channel 221, with the same diameter as the bottom diameter of the first tapered channel 222, is connected to the first tapered channel 222 within the inner diameter of the ejector mixing tube 22. A second tapered channel 224, with its inner diameter gradually increasing along the direction approaching the ejector inlet tube 21, is also provided within the inner diameter of the ejector mixing tube 22. A connecting channel 223 is also provided within the inner diameter of the ejector mixing tube 22, with both ends of the connecting channel 223 connected to the first tapered channel 222 and the second tapered channel 224, respectively. Preferably, the connecting channel 223 is a cylindrical channel.
[0039] Specifically, in this embodiment, the internal structure of the ejector mixing tube 22 is divided into four sections: a second conical channel 224 connected to the ejector inlet tube 21, a connecting channel 223 connecting the second conical channel 224 and the first conical channel 222, the first conical channel 222, and a cylindrical channel 221. The diameter of the connecting channel 223 is smaller than that of the first conical channel 222 and the second conical channel 224. In one example, the connecting channel 223 is cylindrical. Therefore, it can be understood that the cross-sectional diameters of the first conical channel 222 and the second conical channel 224 connected to the connecting channel 223 are the same. The inner diameter setting of the ejector mixing tube 22 can reduce the flow rate of the gas entering the hot isostatic pressing equipment and make the gas flow into the hot isostatic pressing equipment flow evenly into the gas flow generating device, where it mixes with the high-temperature gas inside the hot isostatic pressing equipment. This increases the temperature of the gas entering the hot isostatic pressing equipment from the outside, reduces the temperature difference between the outside gas and the high-temperature gas inside the hot isostatic pressing equipment, and minimizes the impact of low-temperature gas entering the internal area of the hot isostatic pressing equipment on the operating temperature.
[0040] In some embodiments, the inlet 32 of the gas disperser 3 is cylindrical, the second end face 312 of the gas baffle 31 is circular, and the outlet 33 is an annular opening.
[0041] Specifically, in this embodiment, the nozzle of the gas ejector 2 is located at the end of the ejector converging tube 23, and the nozzle is directly opposite the air inlet 32 of the gas disperser 3. The cylindrical air inlet 32 can conveniently collect the gas emitted around the nozzle. In one example, the centerline of the cylindrical air inlet 32 coincides with the centerline of the nozzle. Setting the air outlet 33 of the gas disperser 3 as an annular opening helps to reduce wind resistance and make the gas evenly dispersed.
[0042] The gas flow generating device installed in a hot isostatic pressing (HIP) unit comprises two main components: a gas ejector 2 and a gas disperser 3, which work in conjunction with a high-pressure gas source. The gas ejector 2 is a tubular structure located below the working area of the HIP unit. It has a small internal diameter and typically ends with a nozzle or narrow orifice. It is usually made of high-temperature alloys or ceramics to withstand high temperature and pressure conditions. Its main function is to guide high-speed, high-pressure gas from the gas source into the working area. The high-speed, high-pressure gas supplied by the compressor enters through the bottom inlet of the gas ejector 2, is accelerated, and flows at high speed into the working area, forming a high-speed gas jet that enters the subsequent gas disperser 3. By adjusting the design of the gas ejector 2 and the gas flow rate, the speed and direction of the gas flow can be controlled to meet specific process requirements. The gas disperser 3 is usually located above the gas ejector 2. Its shape is generally conical or fan-shaped, with a gradually increasing inner diameter to slow the gas flow and increase the cross-sectional area. The main function of the gas disperser 3 is to decelerate and diffuse the high-speed incoming gas to create a uniform and stable gas flow. This helps eliminate potential localized temperature and pressure unevenness within the working area, thereby improving product uniformity. The gas disperser 3 also helps reduce eddies and turbulence in the gas flow, resulting in a more uniform gas distribution to meet the requirements of hot isostatic pressing.
[0043] This solution incorporates a gas flow generator within the hot isostatic pressing (HIP) equipment. An external gas compressor introduces high-speed gas into the HIP equipment, causing the gas in the high-temperature region above the equipment to flow downwards. This effectively removes hot gas from the upper region, preventing its accumulation and reducing the temperature there, thus minimizing potential damage to the workpiece or equipment. This not only improves temperature uniformity in the working area but also enhances equipment reliability, ensuring stable operation and performance. It solves the problem in existing technologies where excessive heat insulation from the heat shield leads to slow cooling in the upper region, impacting production efficiency and increasing manufacturing costs.
[0044] In addition, this application also provides a hot isostatic pressing device, including the gas flow generating device as described above, which is fixedly installed at the bottom of the inner cavity of the hot isostatic pressing device.
[0045] Specifically, a lower plug 4, matching the gas flow generator, is installed at the bottom of the inner cavity of the hot isostatic pressing (HIP) equipment. The lower plug 4 is located inside the housing 1 of the gas flow generator, with a space at its upper part. This space is used to mix the low-temperature gas entering the gas flow generator with the high-temperature gas inside the HIP equipment, thereby increasing the temperature of the gas entering the HIP equipment from the outside and reducing the temperature difference between the external gas and the high-temperature gas inside the HIP equipment. The aim is to minimize the impact of low-temperature gas entering the internal area of the HIP equipment on the operating temperature.
[0046] In some embodiments, the high-pressure gas source is provided by an external high-pressure compressor. During the steady-state heat preservation stage or the rapid cooling stage, high-pressure argon gas enters the ejector inlet pipe 21 through a nozzle device connected to the lower plug 4 of the thermal isostatic pressing equipment. To reduce the resistance loss when the high-pressure gas enters, it can be made into a streamlined or conical shape. Experiments have shown that the resistance loss of the two is not much different. For ease of manufacturing, the inner diameter is generally conical. In one embodiment, the pressure of the incoming gas flow is within 10% higher than the working area pressure. The incoming high-pressure gas flow is fully mixed by the low-pressure, low-speed gas flow and the high-pressure, high-speed gas flow provided by the high-pressure compressor through the ejector mixing pipe 22. To ensure that the velocity field and temperature field of the mixture in different states are uniformly distributed before entering the diffuser, a cylindrical mixing pipe is usually used. The fully mixed gas flow enters the gas disperser 3 through the ejector contraction pipe 23. To have a better gas mixing function, a cylindrical structure is usually used as the inlet of the gas disperser 3. During use, the high-pressure, high-speed gas flow forms a certain negative pressure cavity area below the gas disperser 3, thereby driving the gas in the area below the gas disperser 3 into the gas disperser 3. The gas baffle 31 is a circular baffle with a conical structure. The apex of the cone on the baffle faces the inlet of the gas disperser 3. When the airflow entering from the inlet 32 of the gas disperser 3 encounters this conical structure during its ascent, it will be evenly dispersed and sprayed around the cone surface of the gas baffle 31, forming a uniform and stable upward driving airflow.
[0047] The gas flow generating device mixes high-pressure, high-speed airflow with low-pressure, low-speed airflow, and then, through the special structure of the gas baffle 31 in the gas disperser 3, achieves uniform gas dispersion and forms an upward driving airflow. This design ensures uniform gas temperature and pressure distribution within the working area during the operation of the hot isostatic pressing equipment, contributing to improved product uniformity and quality. Furthermore, the formation of the negative pressure cavity region also helps drive gas flow, ensuring that the gas below the gas disperser 3 is uniformly dispersed into the working area, thereby meeting the process requirements of hot isostatic pressing and maintaining a uniform temperature and pressure distribution within the working area. This embodiment is crucial for efficient and stable hot isostatic pressing.
[0048] In this embodiment, the gas flow generating device comprises three main parts: a housing 1, a gas ejector 2, and a gas disperser 3. The housing 1 protects the gas ejector 2 and the gas disperser 3 and provides installation space for them. The gas ejector 2 is fixed to the housing 1 through the wall of the housing 1. The gas ejector 2 is used to introduce high-speed gas generated by an external high-speed gas generating device (e.g., a high-pressure gas compressor) into the interior of the thermal isostatic pressing (HIP) equipment. The high-speed gas can be an inert gas, such as argon.
[0049] The gas ejector 2 consists of three parts: an ejector inlet pipe 21, an ejector mixing pipe 22, and an ejector contraction pipe 23. The outer diameters of the ejector inlet pipe 21, the ejector mixing pipe 22, and the ejector contraction pipe 23 are the same, while their inner diameters differ. One end of the ejector mixing pipe 22 is connected to the ejector inlet pipe 21, and the other end is connected to the ejector contraction pipe 23. The airflow channels inside all three are interconnected.
[0050] The function of the gas disperser 3 is to evenly disperse the high-speed airflow introduced into the hot isostatic press, thereby slowing down and diffusing the airflow.
[0051] It is important to note that within the internal space of housing 1, the introduced high-speed gas is first mixed with the high-temperature gas inside the thermal isostatic pressing (HIP) device. This increases the temperature of the gas entering the HIP device from the outside, reducing the temperature difference between the external gas and the high-temperature gas inside the HIP device. The aim is to minimize the impact of low-temperature gas entering the internal area of the HIP device on the operating temperature.
[0052] Compared with existing technologies, the hot isostatic pressing (HIP) equipment provided in this application incorporates an internal gas flow generator. An external gas compressor introduces high-speed gas into the HIP equipment, causing the gas in the high-temperature region above the equipment to flow downwards. This effectively removes hot gas from the upper region, preventing its accumulation and reducing the temperature there, thus minimizing potential damage to the workpiece or equipment. This not only improves the temperature uniformity of the working area but also enhances the equipment's reliability, ensuring stable operation and performance. It solves the problem in existing technologies where excessive heat insulation from the heat shield leads to slow cooling in the upper region, affecting production efficiency and increasing manufacturing costs.
[0053] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.
Claims
1. A gas flow generating device, applied to a hot isostatic pressing (HIP) equipment, characterized in that, The generating device includes: case; The gas ejector is a tubular structure that is fixed through the housing. The gas ejector includes an ejector inlet pipe, an ejector mixing pipe, and an ejector retraction pipe with the same outer diameter. One end of the ejector mixing pipe is connected to the ejector inlet pipe, and the other end is connected to the ejector retraction pipe. A gas disperser is fixedly installed in the housing. The gas disperser has an airflow channel. The air inlet of the airflow channel is located at one end of the gas disperser. A gas baffle is provided at the other end of the gas disperser. The air outlet of the airflow channel is located around the gas baffle. The ejector retraction tube is provided with a nozzle at its end, and the nozzle is directly facing the air inlet.
2. The gas flow generating device as described in claim 1, characterized in that, The first end face of the gas baffle is conical, serving as the wall of the airflow channel, and the second end face of the gas baffle is planar.
3. The gas flow generating device as described in claim 2, characterized in that, The first end face is a conical surface, and the vertex of the first end face is directly opposite the air inlet.
4. The gas flow generating device as described in claim 1, characterized in that, The inner diameter of the ejector mixing tube has a first tapered channel, and the inner diameter of the first tapered channel gradually increases in the direction away from the ejector inlet tube.
5. The gas flow generating device as described in claim 4, characterized in that, Within the inner diameter of the ejector mixing tube, there is a cylindrical channel communicating with the first conical channel, the diameter of which is the same as the bottom diameter of the first conical channel.
6. The gas flow generating device as described in claim 5, characterized in that, A second conical channel is also provided in the inner diameter of the ejector mixing tube, and the inner diameter of the second conical channel gradually increases along the direction close to the ejector inlet tube.
7. The gas flow generating device as described in claim 6, characterized in that, The inner diameter of the ejector mixing tube is also provided with a connecting channel, the two ends of which are respectively connected to the first conical channel and the second conical channel.
8. The gas flow generating device as described in claim 7, characterized in that, The connection channel is a columnar channel.
9. The gas flow generating device as described in claim 2, characterized in that, The gas disperser has a cylindrical inlet, the second end face of the gas baffle is circular, and the outlet is an annular opening.
10. A hot isostatic pressing apparatus, characterized in that, Includes the gas flow generating device as described in any one of claims 1-9, wherein the gas flow generating device is fixedly disposed at the bottom of the inner cavity of the hot isostatic pressing equipment.