Air flow accelerating device for air injector

Abstract

The utility model relates to fluid control technical field, concretely is the airflow accelerating device of air ejector, including the airflow accelerating pipe of installation in the air ejector gas outlet end and using the laval pipe structure, and the airflow accelerating pipe both ends respectively coaxial with the connecting plug and the connecting slot of setting have, the utility model discloses the airflow accelerating pipe of using the laval pipe structure, utilize the structural characteristics of laval pipe first contraction and then expansion to accelerate airflow, install in the air ejector gas outlet end, and the airflow accelerating pipe both ends respectively coaxial setting connecting plug and connecting slot, and the inner diameter size of connecting plug and connecting slot is compatible, and the splicing combination between multiple airflow accelerating pipes is convenient, the control ball valve of middle part installation can control airflow, and the connecting flange of both ends coaxial installation is convenient for the assembly of airflow accelerating pipe and other components, including titanium alloy outer casing and superhigh temperature ceramic inner casing, and titanium alloy outer casing is high in strength, and superhigh temperature ceramic inner casing can bear superhigh temperature.

Description

Technical Field

[0001] This utility model relates to the field of fluid control technology, specifically to an airflow acceleration device for an air jet. Background Technology

[0002] In industrial production and fluid power applications, air ejectors, as key equipment for guiding, accelerating, and precisely controlling airflow, are of great significance for improving system energy efficiency and ensuring process stability. Highly efficient airflow acceleration devices can significantly improve the operating efficiency, stability, and reliability of a system. While existing airflow acceleration technologies have achieved some success, they still have many shortcomings. For example, prior art document CN222931022U discloses a multi-inlet cyclone cone structure that facilitates airflow acceleration. This structure attempts to optimize the airflow acceleration effect to some extent, but in practical applications, it is difficult to meet the stable operation requirements under extreme conditions such as ultra-high temperatures and high-intensity airflows. Furthermore, it has significant deficiencies in terms of precise airflow acceleration control, ease of multi-segment splicing, and stability. Therefore, developing an air ejector airflow acceleration device that can adapt to complex working conditions, possesses high-efficiency airflow acceleration, and good maneuverability is of significant practical importance. Utility Model Content

[0003] The purpose of this invention is to provide an airflow acceleration device for an air jet, so as to solve the problem of poor acceleration effect of existing airflow acceleration devices mentioned in the background art.

[0004] To achieve the above objectives, this utility model provides the following technical solution:

[0005] An airflow acceleration device for an air injector includes an airflow acceleration tube installed at the air outlet of the air injector and employing a Laval tube structure. Both ends of the airflow acceleration tube are coaxially provided with a connector plug and a connector slot, respectively. The outer diameter of the connector plug and the inner diameter of the connector slot are matched. A control ball valve is installed in the middle of the airflow acceleration tube.

[0006] Both ends of the airflow acceleration tube are coaxially mounted with connecting flanges for easy assembly.

[0007] The airflow acceleration tube includes a titanium alloy outer shell and an ultra-high temperature ceramic inner shell, with a heat insulation buffer layer provided between the titanium alloy outer shell and the ultra-high temperature ceramic inner shell.

[0008] Preferably, the ultra-high temperature ceramic inner shell is made of hafnium-based ceramic with a thickness of 1-4 mm. Hafnium-based ceramic has excellent ultra-high temperature resistance and thermal shock resistance, which can ensure the stability of the inner shell under long-term scouring of high-speed high-temperature airflow. The thickness range of 1-4 mm ensures high temperature resistance without excessively increasing the weight of the device, thus balancing performance and weight.

[0009] Preferably, the heat insulation buffer layer is an aerogel heat insulation felt buffer layer with a thickness of 3-5mm. Aerogel heat insulation felt has excellent heat insulation performance. The thickness of 3-5mm can effectively reduce the heat transfer from the ultra-high temperature ceramic inner shell to the titanium alloy outer shell, reduce the temperature of the outer shell, and at the same time play a good buffering role, absorbing vibration and impact, and protecting the inner and outer shells.

[0010] Preferably, the surface of the titanium alloy housing is provided with an outer coating, which is a thermal barrier coating or an environmental barrier coating. The thermal barrier coating can further reduce the surface temperature of the titanium alloy housing and reduce the heat transfer into the device; the environmental barrier coating can resist the erosion of the external environment, such as oxidation and corrosion, and improve the durability and reliability of the titanium alloy housing.

[0011] Preferably, the thickness of the outer coating is 0.1-0.5mm. The thickness range of 0.1-0.5mm can ensure that the outer coating can play a good role in heat insulation and protection, and will not affect the overall size and weight of the device due to excessive thickness, thus ensuring the portability and compactness of the device.

[0012] Preferably, the outer wall of the connector is provided with an axially limiting protrusion. The limiting protrusion can achieve precise axial positioning when multiple airflow acceleration tubes are spliced, prevent circumferential rotation during the splicing process, and ensure the accuracy and stability of the splicing.

[0013] Preferably, the inner wall of the connecting slot is provided with a limiting groove that matches the cross-sectional size of the limiting protrusion and engages with it. The engaging of the limiting groove with the limiting protrusion further enhances the connection stability after splicing, prevents the airflow acceleration tube from axially displacing when subjected to external force or airflow impact, and ensures the stability of airflow transmission.

[0014] Preferably, the control ball valve has a speed adjustment handle connected to its stem. The speed adjustment handle allows the operator to manually adjust the opening of the control ball valve, thereby achieving precise control of the airflow speed, meeting the diverse needs for airflow speed under different working conditions, and improving the ease of operation and flexibility of use of the device.

[0015] Compared with existing technologies, the advantages of this utility model are as follows: In the airflow acceleration device of this air injector, an airflow acceleration tube with a Laval tube structure is set up. The airflow is accelerated by utilizing the structural characteristics of the Laval tube to first contract and then expand. It is installed at the air outlet end of the air injector, and the two ends of the airflow acceleration tube are respectively provided with a connecting plug and a connecting slot on the same axis. The outer diameter of the connecting plug and the inner diameter of the connecting slot are matched, which facilitates the splicing and combination of multiple airflow acceleration tubes. The control ball valve installed in the middle can control the airflow. The connecting flanges installed on both ends on the same axis facilitate the assembly of the airflow acceleration tube with other components. It includes a titanium alloy outer shell and an ultra-high temperature ceramic inner shell. The titanium alloy outer shell has high strength, and the ultra-high temperature ceramic inner shell can withstand ultra-high temperature. The heat insulation buffer layer set between the two can play a role in heat insulation and buffering. This makes the airflow acceleration device of the air injector not only effectively accelerate the airflow, but also facilitate assembly and splicing, and can adapt to ultra-high temperature environments, with good structural strength and heat insulation performance. Attached Figure Description

[0016] The accompanying drawings are provided to further illustrate the present invention and form part of the specification. They are explained in detail together with the embodiments of the present invention, but do not constitute a limitation thereof.

[0017] Figure 1 This is a schematic diagram of the structure of this utility model;

[0018] Figure 2 This is a cross-sectional structural diagram of the present invention;

[0019] Figure 3 This is a schematic diagram of the cross-sectional structure of the airflow acceleration tube of this utility model;

[0020] 10. Airflow acceleration tube; 11. Connecting flange; 12. Titanium alloy outer shell; 13. Outer coating; 14. Ultra-high temperature ceramic inner shell; 15. Thermal insulation buffer layer;

[0021] 20. Connecting plug; 21. Limiting protrusion;

[0022] 30. Connecting slot; 31. Limiting groove;

[0023] 40. Control ball valve; 41. Speed ​​control handle. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the embodiments and accompanying drawings. 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.

[0025] In the description of this utility model, it should be understood that the terms "center", "vertical", "horizontal", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only used to facilitate the description of this utility model and to simplify the description, and do not indicate or imply that the device or component 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.

[0026] Airflow acceleration device of air jet, such as Figures 1-3 As shown, the device includes an airflow acceleration tube 10 with a Laval tube structure installed at the air outlet of an air injector. A connector 20 and a connector slot 30 are coaxially mounted at both ends of the airflow acceleration tube 10, respectively. The outer diameter of the connector 20 and the inner diameter of the connector slot 30 are matched. A control ball valve 40 is installed in the middle of the airflow acceleration tube 10. Connecting flanges 11 for easy assembly are coaxially mounted at both ends of the airflow acceleration tube 10. The airflow acceleration tube 10 includes a titanium alloy outer shell 12 and an ultra-high temperature ceramic inner shell 14. A heat insulation buffer layer 15 is provided between the titanium alloy outer shell 12 and the ultra-high temperature ceramic inner shell 14. By using the Laval tube structure of the airflow acceleration tube 10, the airflow is accelerated by utilizing the first contraction and then expansion characteristics of the Laval tube. It is installed at the air outlet of the air injector, and... The airflow acceleration tube 10 has a connecting plug 20 and a connecting slot 30 coaxially mounted at both ends. The outer diameter of the connecting plug 20 and the inner diameter of the connecting slot 30 are matched to facilitate the splicing and combination of multiple airflow acceleration tubes 10. The control ball valve 40 installed in the middle can control the airflow. The connecting flange 11 installed coaxially at both ends facilitates the assembly of the airflow acceleration tube 10 with other components. It includes a titanium alloy outer shell 12 and an ultra-high temperature ceramic inner shell 14. The titanium alloy outer shell 12 has high strength, and the ultra-high temperature ceramic inner shell 14 can withstand ultra-high temperature. The heat insulation buffer layer 15 set between the two can play a role in heat insulation and buffering. This makes the airflow acceleration device of the air jet effective in accelerating the airflow, easy to assemble and splice, and adaptable to ultra-high temperature environment. It has good structural strength and heat insulation performance.

[0027] The ultra-high temperature ceramic inner shell 14 is made of hafnium-based ceramic with a thickness of 1-4 mm, and the heat insulation buffer layer 15 is made of aerogel heat insulation felt with a thickness of 3-5 mm. By using hafnium-based ceramic inner shell 14 with a thickness of 1-4 mm, the inner layer of the airflow acceleration tube 10 has excellent ultra-high temperature resistance and can withstand the long-term scouring of high-speed, high-temperature airflow. At the same time, the reasonable thickness design ensures high temperature resistance without excessively increasing the overall weight. The heat insulation buffer layer 15 is made of aerogel heat insulation felt with a thickness of 3-5 mm, which can effectively insulate the titanium alloy outer shell 12 and the ultra-high temperature ceramic inner shell 14, reduce heat transfer, and play a buffering role, protecting the ultra-high temperature ceramic inner shell 14 and the titanium alloy outer shell 12, and extending the service life of the airflow acceleration tube 10.

[0028] Furthermore, the surface of the titanium alloy housing 12 is provided with an outer coating 13. The outer coating 13 is a thermal barrier coating or an environmental barrier coating, and the thickness of the outer coating 13 is 0.1-0.5mm. By providing an outer coating 13 on the surface of the titanium alloy housing 12, and the outer coating 13 is a thermal barrier coating or an environmental barrier coating with a thickness of 0.1-0.5mm, the titanium alloy housing 12 can further obtain good heat insulation and protection effects. The thermal barrier coating can reduce the surface temperature of the titanium alloy housing 12, and the environmental barrier coating can resist the erosion of the external environment, such as oxidation and corrosion, thereby improving the overall reliability and durability of the airflow acceleration tube 10.

[0029] Specifically, the outer wall of the connector 20 is provided with an axially oriented limiting protrusion 21, and the inner wall of the connector slot 30 is provided with a limiting groove 31 that matches the cross-sectional size of the limiting protrusion 21 and engages with it. By providing an axially oriented limiting protrusion 21 on the outer wall of the connector 20 and a limiting groove 31 that matches the cross-sectional size of the limiting protrusion 21 and engages with it on the inner wall of the connector slot 30, multiple airflow acceleration tubes 10 can be accurately positioned and stably connected during splicing, preventing relative rotation or axial displacement after splicing, and ensuring the stability of airflow transmission and the reliability of splicing.

[0030] In addition, a speed control handle 41 is connected to the valve stem of the control ball valve 40. By connecting the speed control handle 41 to the valve stem of the control ball valve 40, the operator can easily and manually adjust the opening of the control ball valve 40, thereby achieving precise control of the airflow speed, meeting the requirements of airflow speed under different working conditions, and improving the ease of operation and flexibility of use of the air jet airflow acceleration device.

[0031] The working principle of the airflow acceleration device in this air jet:

[0032] First, assemble the components by aligning the connector 20 of the airflow accelerator tube 10 with the connector slot 30 of the other airflow accelerator tube 10. With the help of the limiting protrusion 21 on the outer wall of the connector 20 and the limiting groove 31 on the inner wall of the connector slot 30, precise docking and stable splicing can be achieved. At the same time, the airflow accelerator tube 10 can be firmly connected to other components such as the air jet outlet through the connecting flange 11.

[0033] Next, according to actual needs, the opening of the control ball valve 40 is adjusted by operating the speed control handle 41, thereby controlling the size and speed of the airflow entering the airflow acceleration tube 10; when the airflow enters the airflow acceleration tube 10 from the air jet outlet, since the airflow acceleration tube 10 adopts a Laval tube structure, the airflow will first accelerate in the contraction section and then further accelerate in the expansion section to achieve the airflow acceleration effect.

[0034] During use, the ultra-high temperature ceramic inner shell 14 (hafnium-based ceramic material, 1-4mm thick) can withstand the scouring of high-speed, high-temperature airflow, the heat insulation buffer layer 15 (aerogel heat insulation felt buffer layer, 3-5mm thick) plays a role in heat insulation and buffering, and the outer coating 13 (thermal barrier coating or environmental barrier coating, 0.1-0.5mm thick) on the surface of the titanium alloy outer shell 12 provides additional protection to ensure stable operation of the device.

[0035] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. An air flow accelerating device for an air injector, comprising an air flow accelerating tube (10) in the form of a Laval tube mounted at the air outlet end of the air injector, characterized in that: The airflow accelerating tube (10) is coaxially provided with a connecting plug (20) and a connecting slot (30) at two ends respectively, the outer diameter of the connecting plug (20) and the inner diameter of the connecting slot (30) are matched in size, and a control ball valve (40) is mounted in the middle of the airflow accelerating tube (10); The two ends of the airflow accelerating tube (10) are coaxially provided with connecting flanges (11) for facilitating assembly; The airflow accelerating tube (10) comprises a titanium alloy outer shell (12) and an ultra-high temperature ceramic inner shell (14), and a heat insulation buffer layer (15) is arranged between the titanium alloy outer shell (12) and the ultra-high temperature ceramic inner shell (14).

2. The airflow accelerating device of an air jet according to claim 1, characterized in that: The ultra-high temperature ceramic inner shell (14) is a hafnium-based ceramic inner shell with a thickness of 1-4 mm.

3. The airflow accelerating device of an air jet according to claim 1, characterized in that: The heat insulation buffer layer (15) is an aerogel heat insulation felt buffer layer with a thickness of 3-5 mm.

4. The airflow accelerating device of an air jet according to claim 1, characterized in that: The surface of the titanium alloy outer shell (12) is provided with an outer coating layer (13), and the outer coating layer (13) is a thermal barrier coating layer or an environmental barrier coating layer.

5. The airflow accelerating device of an air jet according to claim 4, characterized in that: The thickness of the outer coating layer (13) is 0.1-0.5 mm.

6. The airflow accelerating device of an air jet according to claim 1, characterized in that: The outer wall of the connecting plug (20) is provided with a limiting convex strip (21) in the axial direction.

7. The airflow accelerating device of an air jet according to claim 6, characterized in that: The inner wall of the connecting slot (30) is provided with a limiting groove (31) matched in cross-sectional size with the limiting convex strip (21) and in clamping cooperation.

8. The airflow accelerating device of an air jet according to claim 1, characterized in that: A speed regulating handle (41) is connected to the valve stem of the control ball valve (40).

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