An active control device, control method and ejector for ejector mixing characteristics

Abstract

The present invention belongs to the field of ejectors, and particularly relates to an active control device for ejector mixing characteristics, a control method, and an ejector. The active control device includes a sidewall jet mechanism and a nozzle jet mechanism; the sidewall jet mechanism includes sidewall air outlets provided on both sidewalls of the suction chamber; the nozzle jet mechanism includes two nozzle jet outlets provided on both sides of the outlet of the two-dimensional Laval nozzle, and the nozzle side jets ejected from the two nozzle jet outlets are alternately ejected. The active control device for ejector mixing characteristics provided by the present invention enables the ejector airflows of one or more two-dimensional Laval nozzles on the two-dimensional strut ejector to be fully and evenly mixed with the entrained airflows of two or more entrained airflow sub-channels, thereby improving its mixing characteristics.

Description

Technical Field

[0001] The present invention belongs to the field of ejectors, and particularly relates to an active control device, a control method and an ejector for the mixing characteristics of an ejector. Background Art

[0002] A gas ejector is a gas power device without any moving parts. Its principle is to transfer kinetic energy from a high-energy gas to a passive entrained gas by using the viscous shear force and convective action of the gas, thereby increasing the pressure of the entrained gas flow. With advantages such as a large pressure ratio, a wide load matching range, a fast control response, and good self-stabilization performance under variable operating conditions, the ejector is widely used in refrigeration systems and altitude simulation test benches, etc.

[0003] Under the current technical conditions, a passive control method is often used to improve the mixing efficiency of the ejector, such as changing the nozzle structure. Therefore, when the operating conditions are fixed, the improvement range of its mixing efficiency is fixed, and the improvement range of the ejector performance is also fixed.

[0004] Using an active control method to improve the mixing efficiency of the ejector, such as acoustic excitation, is not applicable to large ejectors, such as large devices like rocket altitude simulation test benches and chemical laser pressure recovery systems. Currently, the application is only limited to small ejectors.

[0005] Therefore, improving the mixing efficiency of large ejectors has become an urgent problem to be solved at present. Summary of the Invention

[0006] The technical problem to be solved by the present invention is to provide an active control device, a control method and an ejector for the mixing characteristics of an ejector to improve the mixing efficiency of a large ejector.

[0007] The present invention provides an active control device for the mixing characteristics of an ejector, including a sidewall jet mechanism and a nozzle jet mechanism;

[0008] The sidewall jet mechanism includes sidewall air flow outlets arranged on both sidewalls of the suction chamber. The sidewall air flow outlets eject sidewall jets to insulate the suction chamber and the mixing and diffusing pipeline, and at the same time guide the entrained air flow in the outer entrained air flow sub-channel to deflect towards the middle of the suction chamber;

[0009] When only one two-dimensional Laval nozzle is provided, the nozzle jet mechanism includes two nozzle jet outlets arranged on both sides of the outlet of the two-dimensional Laval nozzle. The nozzle side jets ejected from the two nozzle jet outlets are alternately ejected, and the nozzle jet outlets are used to guide the entrained air flow to deflect towards the other side of the outlet;

[0010] When two or more two-dimensional Laval nozzles are arranged in parallel, the nozzle side jets are ejected simultaneously from the two nozzle jet outlets that are close to each other on adjacent two-dimensional Laval nozzles, and the nozzle side jets are ejected simultaneously from the two nozzle jet outlets that are far from each other on adjacent two-dimensional Laval nozzles.

[0011] Furthermore, the side wall air flow outlet is arranged in a slit shape along the height direction of the suction chamber.

[0012] Furthermore, the side wall jet mechanism further includes a gas collecting box and a side wall gas channel;

[0013] The gas collecting box is arranged on the outer wall of the suction chamber, and a side wall air inlet is arranged on the outer wall of the gas collecting box;

[0014] The side wall gas channel is arranged in the wall surface of the suction chamber. One end of the side wall gas channel communicates with the gas collecting box, and the other end communicates with the side wall air flow outlet.

[0015] Furthermore, the side wall air inlet is used to communicate with an external air supply device.

[0016] Furthermore, the nozzle jet outlet is arranged in a slit shape along the height direction of the two-dimensional Laval nozzle outlet.

[0017] Furthermore, the nozzle jet mechanism further includes a nozzle side gas collecting cavity, a valve mechanism, and two nozzle side gas channels;

[0018] The nozzle side gas collecting cavity is arranged in the support plate and communicates with the gas collecting cavity at one end;

[0019] The two nozzle side gas channels are arranged in the support plate. One ends of the two nozzle side gas channels are connected to the nozzle side gas collecting cavity, and the other ends are respectively connected to one of the nozzle jet outlets;

[0020] The valve mechanism is used to control that only one of the nozzle side gas channels communicates with the nozzle side gas collecting cavity at the same time.

[0021] Furthermore, the valve mechanism includes a rotary drive mechanism, a transmission shaft, and a valve plate connected in sequence;

[0022] The rotary drive mechanism is arranged outside the suction chamber;

[0023] The support plate and the wall surface of the suction chamber are provided with rotation holes, and the transmission shaft is rotatably arranged in the rotation holes in a sealed manner;

[0024] The valve plate is rotatably arranged in the nozzle side gas collecting cavity. The rotary drive mechanism drives the valve plate to rotate through the transmission shaft, and the valve plate blocks one of the nozzle side gas channels at the same time.

[0025] The present invention also provides an active control method for the ejector mixing characteristics, which uses the above-mentioned active control device for the ejector mixing characteristics and includes the following steps:

[0026] When the ejector is working, the sidewall air flow outlet continuously ejects sidewall jets, which insulate the suction chamber and the mixing and diffusing pipeline, and at the same time guide the entrained air flow in the outer entrained air flow sub-channel to deflect towards the middle of the suction chamber, improving the mixing effect of the entrained air flow and the ejector air flow;

[0027] The two nozzle jet outlets on both sides of the outlet of the two-dimensional Laval nozzle alternately eject jets. When ejecting from one of the nozzle jet outlets, guide the ejector air flow to deflect towards the other side of the outlet, improving the mixing effect of the ejector air flow and the entrained air flow;

[0028] When there are more than two two-dimensional Laval nozzles arranged in parallel, the two nozzle side jets are simultaneously ejected from the two nozzle jet outlets on adjacent two-dimensional Laval nozzles that are close to each other, guiding the two ejector air flows to deflect away from each other, and the two nozzle side jets are simultaneously ejected from the two nozzle jet outlets on adjacent two-dimensional Laval nozzles that are far from each other, guiding the two ejector air flows to deflect towards each other.

[0029] The present invention also provides a strut ejector with a two-dimensional configuration, including an ejector and the above-mentioned active control device for the ejector mixing characteristics.

[0030] Furthermore, two struts of the ejector are arranged parallel to each other.

[0031] The beneficial effect of the present invention is that the active control device for the ejector mixing characteristics provided by the present invention, through the setting of the sidewall jet mechanism, while insulating the sidewalls of the suction chamber and the mixing and diffusing pipeline and improving the service life of the ejector, can guide the entrained air flow in the outer entrained air flow sub-channel to deflect towards the middle of the suction chamber, and the nozzle jet mechanism can guide the ejector air flow at the outlet of the two-dimensional Laval nozzle to deflect alternately, or interact with the deflected entrained air flow in the outer entrained air flow sub-channel to improve the mixing effect, or interact with the ejector air flow at the outlet of the adjacent two-dimensional Laval nozzle to improve the mixing effect, so that the ejector air flows of more than one two-dimensional Laval nozzle on the strut ejector with a two-dimensional configuration can be fully and evenly mixed with the entrained air flows of more than two entrained air flow sub-channels, thereby improving its mixing characteristics. At the same time, the present application has no protruding diversion structure at all, will not generate additional air flow resistance, and thus will not affect the air flow effect of the strut ejector with a two-dimensional configuration. Description of the Drawings

[0032] Att Figure 1 is a schematic structural diagram of the ejector in the present invention from the first angle;

[0033] Att Figure 2Schematic diagram of the second angle structure of the ejector in the present invention;

[0034] Appendix Figure 3 Front view of the ejector in the present invention;

[0035] Appendix Figure 4 Is the sectional view taken along the A-A direction in Figure 3 ;

[0036] Appendix Figure 5 Is the sectional view taken along the B-B direction in Figure 3 ;

[0037] Appendix Figure 6 Is the sectional view taken along the C-C direction in Figure 4 ;

[0038] Appendix Figure 7 Schematic diagram of the structure of the suction chamber in the present invention;

[0039] Appendix Figure 8 Schematic diagram of the structure of the support plate in the present invention;

[0040] Appendix Figure 9 Schematic diagram of the structure of the valve mechanism in the present invention;

[0041] Appendix Figure 10 Schematic diagram of the flow process at the first moment of the ejector in the present invention;

[0042] Appendix Figure 11 Schematic diagram of the flow process at the second moment of the ejector in the present invention.

[0043] In the figure, 1 - Entrance of the entrained air flow; 2 - Entrance of the ejecting air flow; 3 - Gas collecting chamber; 4 - Support plate; 5 - Mixing and diffusing pipeline; 6 - Inlet of the nozzle air guiding chamber; 7 - Nozzle air guiding chamber; 8 - Sub-channel of the entrained air flow; 9 - Front-end guiding section; 10 - Two-dimensional Laval nozzle; 17 - Suction chamber; 18 - Sidewall jet mechanism; 1801 - Sidewall air outlet; 1802 - Air collecting box; 1803 - Sidewall gas channel; 1804 - Sidewall air inlet; 19 - Nozzle jet mechanism; 1901 - Nozzle jet outlet; 1902 - Nozzle side gas collecting chamber; 1903 - Nozzle side gas channel; 1904 - Valve mechanism; 19041 - Rotary drive mechanism; 19042 - Transmission shaft; 19043 - Valve plate; 20 - Sidewall jet; 21 - Nozzle side jet; 22 - Entrained air flow; 23 - Ejecting air flow. Detailed implementation manners

[0044] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0045] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative position relationship, movement conditions, etc. between components in a specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indications will also change accordingly.

[0046] In addition, in the present invention, descriptions such as "first" and "second" are only for descriptive purposes, and cannot be understood as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of the present invention, "a plurality" means at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0047] In the present invention, unless otherwise clearly specified and limited, terms such as "connection" and "fixation" shall be understood in a broad sense. For example, "fixation" may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection, an electrical connection, a physical connection, or a wireless communication connection; it may be directly connected, or indirectly connected through an intermediate medium, and may be the internal communication of two components or the interaction relationship between two components, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0048] In addition, the technical solutions between various embodiments of the present invention can be combined with each other, but it must be based on the ability of those of ordinary skill in the art to implement. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the protection scope required by the present invention.

[0049] As shown in the attached Figure 1 - attached Figure 11As shown in the figure, the present invention provides an active control device for ejector mixing characteristics, which is used to actively enhance the mixing characteristics of the ejector airflow and the entrained airflow of a two-dimensional configuration strut ejector. The specific structure of the strut ejector includes: the external configuration of the ejector is rectangular, and there is a rectangular cavity with openings at both ends inside the ejector. At one end opening of the ejector, there is an entrained airflow inlet 1 connected to the internal cavity of the ejector. The external shape and size of the entrained airflow inlet 1 are the same as those of the internal rectangular cavity of the ejector. At the other end opening of the ejector, there is a mixing and diffusing duct 5 connected to the internal cavity of the ejector. On the upper side wall of the ejector, there is a rectangular air collecting chamber 3. Inside the internal cavity of the ejector, there is at least one vertical strut 4. The number of struts 4 is preferably two. Inside the strut 4, there is a vertical nozzle air guiding cavity 7. Both ends of the strut 4 are connected to the inner side wall of the ejector. On the side wall above the air collecting chamber 3, there is an ejector airflow inlet 2. The air collecting chamber 3 is connected to the nozzle air guiding cavity 7 through a nozzle air guiding cavity air inlet 6. The ejector airflow inlet 2 is directly opposite to the nozzle air guiding cavity air inlet 6. The strut 4 is provided with a front end guiding section 9 facing the entrained airflow inlet 1. The front end guiding section 9 is arranged in an acute conical shape facing the entrained airflow direction. The strut 4 divides the internal cavity of the ejector into parallel and equally spaced entrained airflow sub-channels 8. The strut 4 is provided with a two-dimensional Laval nozzle 10 that gradually increases in the entrained airflow direction towards the mixing and diffusing duct 5. The inlet of the two-dimensional Laval nozzle 10 is communicated with the nozzle air guiding cavity 7, and the outlet of the two-dimensional Laval nozzle 10 is communicated with the mixing and diffusing duct 5. The structures of the front end guiding section 9, the two-dimensional Laval nozzle 10, and the nozzle air guiding cavity 7 are integrally designed to form the strut 4.

[0050] The active control device for ejector mixing characteristics includes a sidewall jet mechanism 18 and a nozzle jet mechanism 19; the sidewall jet mechanism 18 includes sidewall airflow outlets 1801 provided on both sidewalls of the suction chamber 17. The sidewall airflow outlets 1801 eject sidewall jets 20. The sidewall jets 20 insulate the sidewalls of the suction chamber 17 and the mixing and diffusing duct 5, preventing the high-temperature entrained airflow from eroding the wall surface, playing a role in cooling the wall surface, improving the service life of the ejector, and at the same time guiding the entrained airflow in the outer entrained airflow sub-channels 8 to deflect towards the middle of the suction chamber 17, thereby changing the direction of the entrained airflow and making it penetrate into the core of the ejector airflow, enhancing the mixing efficiency. Refer to Figure 10 and Figure 11 , the sidewall jet 20 of the sidewall airflow outlet 1801 marked ① guides the entrained airflow 22 here to deflect towards the middle of the mixing and diffusing duct 5, and the sidewall jet 20 of the sidewall airflow outlet 1801 marked ⑥ guides the entrained airflow 22 here to deflect towards the middle of the mixing and diffusing duct 5;

[0051] The nozzle jet mechanism 19 includes two nozzle jet outlets 1901 arranged on both sides of the outlet of the two-dimensional Laval nozzle 10. The nozzle side jets 21 ejected from the two nozzle jet outlets 1901 are ejected alternately. The nozzle jet outlet 1901 is used to guide the entrained air flow to deflect to the other side of the outlet. The two nozzle jet outlets 1901 on one two-dimensional Laval nozzle 10 work alternately, which can change the flow direction of the entrained air flow at the outlet of the two-dimensional Laval nozzle 10, making it penetrate into the entrained air flow. And due to the alternate operation, the direction of the entrained air flow will be alternately changed. On the one hand, it can improve the air flow disturbance at the mixing and diffusing duct 5 and enhance its mixing effect. On the other hand, the alternately turning entrained air flow combines with the two side wall jet mechanisms 18 to change the direction of the entrained air flow, so that the entrained air flow and the entrained air flows on both sides deflect towards each other alternately, greatly improving the mixing efficiency of the entrained air flow and the entrained air flows on both sides, and ensuring the mixing uniformity of the entrained air flow and the entrained air flows on both sides;

[0052] When two or more two-dimensional Laval nozzles 10 are arranged in parallel, and usually two or more two-dimensional Laval nozzles 10 are arranged in parallel, the nozzle side jets 21 are ejected simultaneously from the two nozzle jet outlets 1901 on the adjacent two-dimensional Laval nozzles 10 that are close to each other. Refer to the attached Figure 11 , the nozzle jet outlet 1901 marked ③ of the two-dimensional Laval nozzle 10 shown in the figure ejects the nozzle side jet 21, guiding the entrained air flow 23 ejected from this two-dimensional Laval nozzle 10 to deflect upward, and combining with the entrained air flow 22 deflected by the side wall jet 20 of the side wall air flow outlet 1801 marked ① above. The two deflect relatively, which can greatly improve their mixing effect; at the same time, the nozzle jet outlet 1901 marked ④ of the two-dimensional Laval nozzle 10 shown in the figure ejects the nozzle side jet 21, guiding the entrained air flow 23 ejected from this two-dimensional Laval nozzle 10 to deflect downward, and combining with the entrained air flow 22 deflected by the side wall jet 20 of the side wall air flow outlet 1801 marked ⑥ below. The two deflect relatively, which can greatly improve their mixing effect;

[0053] The nozzle side jets 21 are ejected simultaneously from the two nozzle jet outlets 1901 on the adjacent two-dimensional Laval nozzles 10 that are far from each other. Refer to the attached Figure 10 , the nozzle jet outlet 1901 marked ② of the two-dimensional Laval nozzle 10 shown in the figure ejects the nozzle side jet 21, guiding the entrained air flow 23 ejected from this two-dimensional Laval nozzle 10 to deflect downward; at the same time, the nozzle jet outlet 1901 marked ⑤ of the two-dimensional Laval nozzle 10 shown in the figure ejects the nozzle side jet 21, guiding the entrained air flow 23 ejected from this two-dimensional Laval nozzle 10 to deflect upward. The entrained air flows 23 of the two two-dimensional Laval nozzles 10 both rotate towards the entrained air flow 22 in the middle entrained air flow sub-channel 8, improving the mixing effect of the two entrained air flows 23 and the entrained air flow 22 between them;

[0054] In this way, at any moment, the nozzle side jet 21 ejected from each nozzle jet outlet 1901 can cooperate with the nozzle side jet 21 ejected from another nozzle jet outlet 1901 or the side wall jet 20 of the side wall air flow outlet 1801 to improve the mixing effect.

[0055] The active control device for the ejector mixing characteristics provided by the present invention, through the arrangement of the side wall jet mechanism 18, while insulating the side walls of the suction chamber 17 and the mixing and diffusing pipeline 5 to improve the service life of the ejector, can guide the entrained air flow in the outer entrained air flow sub-channel 8 to deflect towards the middle of the suction chamber 17. The nozzle jet mechanism 19 can guide the ejector air flow at the outlet of the two-dimensional Laval nozzle 10 to deflect alternately, or interact with the deflected entrained air flow in the outer entrained air flow sub-channel 8 to improve the mixing effect, or interact with the ejector air flow at the outlet of the adjacent two-dimensional Laval nozzle 10 to improve the mixing effect, so that the ejector air flow of more than one two-dimensional Laval nozzle 10 and the entrained air flow of more than two entrained air flow sub-channels 8 on the two-dimensional configuration strut ejector can be fully and evenly mixed, thereby improving its mixing characteristics. At the same time, the present application has no protruding flow guiding structure at all, will not generate additional air flow resistance, and thus will not affect the air flow effect of the two-dimensional configuration strut ejector.

[0056] In one embodiment, referring to the attached Figure 7 , the side wall air flow outlet 1801 is arranged in a slit shape along the height direction of the suction chamber 17, so as to ensure the heat insulation effect and the guiding effect in the entire height direction of the side walls of the suction chamber 17 and the mixing and diffusing pipeline 5.

[0057] In one embodiment, the side wall jet mechanism 18 further includes an air collecting box 1802 and a side wall gas channel 1803;

[0058] The air collecting box 1802 is arranged on the outer wall of the suction chamber 17, and a side wall air inlet 1804 is arranged on the outer wall of the air collecting box 1802, and the side wall air inlet 1804 is used to connect an external air supply device;

[0059] The side wall gas channel 1803 is arranged in the wall surface of the suction chamber 17, one end of the side wall gas channel 1803 communicates with the air collecting box 1802, and the other end communicates with the side wall air flow outlet 1801.

[0060] In this embodiment, the external air supply device supplies air through the air collecting box 1802 arranged on the outer wall of the suction chamber 17, so that a uniform and high-speed side wall jet 20 is ejected from the side wall air flow outlet 1801.

[0061] In one embodiment, the sidewall air inlet 1804 is used to communicate with an external air supply device, and the external air supply device provides a high-pressure heat-insulating air flow, such as nitrogen, so as to cool the sidewalls of the suction chamber 17 and the mixing and diffusing duct 5.

[0062] In one embodiment, referring to the attached Figure 7 , the nozzle jet outlet 1901 is arranged in a slit along the height direction of the outlet of the two-dimensional Laval nozzle 10. In this way, the guiding of the entrained air flow can be carried out in the entire height direction of the nozzle jet outlet 1901, improving the guiding effect of the entrained air flow.

[0063] In one embodiment, referring to the attached Figure 8 and the attached Figure 9 , the nozzle jet mechanism 19 further includes a nozzle side air collecting chamber 1902, a valve mechanism 1904 and two nozzle side gas channels 1903;

[0064] The nozzle side air collecting chamber 1902 is arranged in the support plate 4 and is connected to the air collecting chamber 3 at one end;

[0065] The two nozzle side gas channels 1903 are arranged in the support plate 4. One ends of the two nozzle side gas channels 1903 are connected to the nozzle side air collecting chamber 1902, and the other ends are respectively connected to one of the nozzle jet outlets 1901. At this time, the nozzle side jet 21 ejected from the nozzle jet outlet 1901 and the entrained air flow ejected from the two-dimensional Laval nozzle 10 come from the same source, that is, from the air collecting chamber 3. On the one hand, it can avoid too high content of other gases in the ejector, and on the other hand, it can greatly utilize the original structure of the two-dimensional configuration support plate ejector, reducing the complexity of the air supply structure of the nozzle jet outlet 1901;

[0066] The valve mechanism 1904 is used to control only one of the nozzle side gas channels 1903 to communicate with the nozzle side air collecting chamber 1902 at the same time, so as to ensure the alternating operation of the two nozzle jet outlets 1901.

[0067] In one embodiment, the valve mechanism 1904 includes a rotary drive mechanism 19041, a transmission shaft 19042 and a valve plate 19043 connected in sequence;

[0068] The rotary drive mechanism 19041 is arranged outside the suction chamber 17. On the one hand, it is convenient for the disassembly and maintenance of the rotary drive mechanism 19041, and on the other hand, it can avoid the rotary drive mechanism 19041 being arranged in the nozzle side air collecting chamber 1902 and being worn by the entrained air flow;

[0069] The support plate 4 and the wall surface of the suction chamber 17 are provided with rotation holes, and the transmission shaft 19042 is rotatably arranged in the rotation holes in a sealed manner;

[0070] The valve plate 19043 is rotatably arranged in the nozzle side gas collecting cavity 1902. The rotary drive mechanism 19041 drives the valve plate 19043 to rotate through a transmission shaft 19042. The valve plate 19043 blocks one of the nozzle side gas channels 1903 at the same time. Preferably, the rotary drive mechanism 19041 is a swing motor, which drives the valve plate 19043 to swing reciprocally, so that the two nozzle side gas channels 1903 are alternately opened.

[0071] The present invention also provides an active control method for the entrainment mixing characteristics, using the above-mentioned active control device for the entrainment mixing characteristics, including the following steps:

[0072] When the ejector is working, the side wall air flow outlet 1801 continuously ejects the side wall jet 20, which insulates the suction chamber 17 and the mixing and diffusing pipeline 5, and at the same time guides the entrained air flow in the outer entrained air flow sub-channel 8 to deflect towards the middle of the suction chamber 17, improving the mixing effect of the entrained air flow and the entraining air flow;

[0073] The two nozzle jet outlets 1901 on both sides of the outlet of the two-dimensional Laval nozzle 10 eject alternately. When one of the nozzle jet outlets 1901 ejects, it guides the entraining air flow to deflect towards the other side of the outlet, improving the mixing effect of the entraining air flow and the entrained air flow;

[0074] When two or more two-dimensional Laval nozzles 10 are arranged in parallel, the two nozzle side jets 21 are ejected simultaneously from the two nozzle jet outlets 1901 that are close to each other on the adjacent two-dimensional Laval nozzles 10, guiding the two entraining air flows to deflect towards the opposite sides, and the two nozzle side jets 21 are ejected simultaneously from the two nozzle jet outlets 1901 that are far from each other on the adjacent two-dimensional Laval nozzles 10, guiding the two entraining air flows to deflect towards the approaching sides.

[0075] The present invention also provides a two-dimensional support plate ejector, comprising an ejector and an active control device for the above-mentioned ejection mixing characteristics. The external configuration of the two-dimensional support plate ejector is rectangular. A rectangular cavity with openings at both ends is provided inside the ejector's suction chamber 17. An ejected air flow inlet 1 connected to the internal cavity of the ejector is provided at one end of the suction chamber 17. The ejected air flow inlet 1 has an outer size that is the same as the size of the internal rectangular cavity of the suction chamber 17. A mixing and pressure diffusion pipe 5 connected to the internal cavity of the suction chamber 17 is provided at the other end of the suction chamber 17. A rectangular air collecting cavity 3 is provided on the upper side wall of the suction chamber 17. Two vertical support plates 4 are provided in the internal cavity of the suction chamber 17. A vertical nozzle air guide cavity 7 is provided inside the support plate 4. Both ends of the support plate 4 are connected to the inner wall of the suction chamber 17. An induced air flow inlet 2 is provided on the side wall above the air collecting chamber 3. The air collecting chamber 3 is connected to the nozzle air guiding chamber 7 through the nozzle air guiding chamber air inlet 6. The induced air flow inlet 2 is directly opposite to the nozzle air guiding chamber air inlet 6. The support plate 4 is provided with a front end guide section 9 facing the induced air flow inlet 1. The front end guide section 9 is arranged in an acute cone shape facing the induced air flow direction. The support plate 4 divides the internal cavity of the suction chamber 17 into parallel equidistant induced air flow channels 8. The support plate 4 is provided with a two-dimensional Laval nozzle 10 which gradually increases in size along the induced air flow direction in the direction of the mixing and expanding pipe 5. The inlet of the two-dimensional Laval nozzle 10 is connected to the nozzle air guiding chamber 7, and the outlet of the Laval nozzle 10 is connected to the mixing and expanding pipe 5. The structure of the front end guide section 9, the two-dimensional Laval nozzle 10 and the nozzle air guiding chamber 7 is integrated into the support plate 4.The specific structure of the strut ejector includes: the external configuration of the ejector is rectangular, and the interior of the ejector is provided with a rectangular cavity with openings at both ends. At one end opening of the ejector, there is an entrained air inlet 1 connected to the internal cavity of the ejector. The outer shape and size of the entrained air inlet 1 are the same as those of the internal rectangular cavity of the ejector. At the other end opening of the ejector, there is a mixing and diffusing duct 5 connected to the internal cavity of the ejector. On the upper side wall of the ejector, there is a rectangular air collecting cavity 3. The internal cavity of the ejector is provided with at least one vertical strut 4. Preferably, the number of struts 4 is two. The interior of the strut 4 is provided with a vertical nozzle air guiding cavity 7. Both ends of the strut 4 are connected to the inner side wall of the ejector. On the side wall above the air collecting cavity 3, there is an ejecting air inlet 2. The air collecting cavity 3 is connected to the nozzle air guiding cavity 7 through a nozzle air guiding cavity air inlet 6. The ejecting air inlet 2 is directly opposite to the nozzle air guiding cavity air inlet 6. The strut 4 is provided with a front end guiding section 9 facing the direction of the entrained air inlet 1. The front end guiding section 9 is arranged in an acute conical shape facing the direction of the entrained air. The strut 4 divides the internal cavity of the ejector into parallel and equally spaced entrained air sub-channels 8. The strut 4 is provided with a two-dimensional Laval nozzle 10 that gradually increases in the direction of the entrained air towards the mixing and diffusing duct 5. The inlet of the two-dimensional Laval nozzle 10 is communicated with the nozzle air guiding cavity 7, and the outlet of the two-dimensional Laval nozzle 10 is communicated with the mixing and diffusing duct 5. The structures of the front end guiding section 9, the two-dimensional Laval nozzle 10, and the nozzle air guiding cavity 7 are integrally designed to form the strut 4.

[0076] In one embodiment, two struts 4 of the ejector are arranged in parallel. At this time, three parallel and equally spaced entrained air sub-channels 8 are arranged in parallel.

[0077] As described above, this is only an embodiment and does not impose any limitation on the present invention. Any person skilled in the art can, without departing from the scope of the technical solution of the present invention, make many possible changes, modifications, or equivalent variations and equivalent embodiments by using the technical content disclosed above. Therefore, any simple modification, equivalent variation, and modification made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention shall fall within the scope of protection of the technical solution of the present invention.

Claims

1. An active control device for ejection mixing characteristics, used for actively enhancing the mixing characteristics of ejection airflow and ejected airflow of a support plate ejector, wherein the inner cavity of the ejector is provided with at least one vertical support plate (4), the support plate (4) divides the inner cavity of the ejector into parallel ejected airflow sub-channels (8), the support plate (4) is provided with a two-dimensional Laval nozzle (10) which gradually increases in size along the ejected airflow direction, and is characterized in that: It includes a side wall jet mechanism (18) and a nozzle jet mechanism (19); The side wall jet mechanism (18) comprises side wall airflow outlets (1801) arranged on the two side walls of the suction chamber (17), the side wall airflow outlets (1801) ejecting side wall jets (20) to thermally insulate the suction chamber (17) and the mixing and diffuser pipe (5), while guiding the ejected airflow of the outer ejected airflow sub-channel (8) to deflect toward the middle of the suction chamber (17); The nozzle jet mechanism (19) comprises two nozzle jet outlets (1901) arranged on both sides of the outlet of the two-dimensional Laval nozzle (10), the nozzle side jets (21) ejected from the two nozzle jet outlets (1901) are ejected alternately, and the nozzle jet outlets (1901) are used to guide the injection airflow to deflect to the side of the outlet of the two-dimensional Laval nozzle (10) away from the nozzle jet outlet (1901); When there are more than two two-dimensional Laval nozzles (10) arranged in parallel, two nozzle jet outlets (1901) close to each other on two adjacent two-dimensional Laval nozzles (10) simultaneously eject nozzle side jets (21), and two nozzle jet outlets (1901) far away from each other on two adjacent two-dimensional Laval nozzles (10) simultaneously eject nozzle side jets (21).

2. The active control device for injection mixing characteristics according to claim 1, characterized in that: The side wall air flow outlets (1801) are arranged in the form of slits along the height direction of the suction chamber (17).

3. The active control device for injection mixing characteristics as claimed in claim 2, characterized in that: The side wall jet mechanism (18) further comprises a gas collecting box (1802) and a side wall gas channel (1803); The gas collecting box (1802) is arranged on the outer wall of the suction chamber (17), and the outer wall of the gas collecting box (1802) is provided with a side wall air inlet (1804); The side wall gas channel (1803) is arranged in the wall surface of the suction chamber (17); one end of the side wall gas channel (1803) is connected to the gas collecting box (1802), and the other end is connected to the side wall air flow outlet (1801).

4. The active control device for injection mixing characteristics as claimed in claim 3, characterized in that: The side wall air inlet (1804) is used to connect to an external air supply device.

5. The active control device for injection mixing characteristics according to claim 1, characterized in that: The nozzle jet outlet (1901) is arranged in the form of a slit along the outlet height direction of the two-dimensional Laval nozzle (10).

6. The active control device for injection mixing characteristics according to claim 5, characterized in that: The nozzle jet mechanism (19) further comprises a nozzle side gas collecting chamber (1902), a valve mechanism (1904) and two nozzle side gas channels (1903); The nozzle side air collecting chamber (1902) is arranged in the support plate (4), and one end of the nozzle side air collecting chamber (1902) is connected to the air collecting chamber (3); The two nozzle side gas channels (1903) are arranged in the support plate (4), one end of the two nozzle side gas channels (1903) is connected to the nozzle side gas collecting cavity (1902), and the other end is respectively connected to one of the nozzle jet outlets (1901); The valve mechanism (1904) is used to control only one of the nozzle side gas channels (1903) to be connected to the nozzle side gas collecting chamber (1902) at the same time.

7. The active control device for injection mixing characteristics according to claim 6, characterized in that: The valve mechanism (1904) comprises a rotary drive mechanism (19041), a transmission shaft (19042) and a valve plate (19043) which are connected in sequence; The rotary drive mechanism (19041) is arranged outside the suction chamber (17); The support plate (4) and the wall surface of the suction chamber (17) are provided with a rotation hole, and the transmission shaft (19042) is sealed and rotatably arranged in the rotation hole; The valve plate (19043) is rotatably arranged in the nozzle side gas collecting chamber (1902), and the rotary drive mechanism (19041) drives the valve plate (19043) to rotate via the transmission shaft (19042), and the valve plate (19043) blocks one nozzle side gas channel (1903) at the same time.

8. A method for actively controlling the injection mixing characteristics, characterized in that: The active control device for injection mixing characteristics according to any one of claims 1 to 7 comprises the following steps: When the ejector is working, the side wall airflow outlet (1801) continuously ejects the side wall jet (20) to insulate the suction chamber (17) and the mixing and diffusion pipe (5), while guiding the ejected airflow of the outer ejected airflow sub-channel (8) to deflect toward the middle of the suction chamber (17), thereby improving the mixing effect of the ejected airflow and the ejecting airflow; Two nozzle jet outlets (1901) on both sides of the outlet of the two-dimensional Laval nozzle (10) spray alternately, and when one of the nozzle jet outlets (1901) sprays, the induced airflow is guided to deflect toward the side of the outlet of the two-dimensional Laval nozzle (10) away from the nozzle jet outlet (1901), thereby improving the mixing effect of the induced airflow and the induced airflow; When there are more than two two-dimensional Laval nozzles (10) arranged in parallel, two nozzle jet outlets (1901) on two adjacent two-dimensional Laval nozzles (10) that are close to each other simultaneously eject nozzle side jets (21) to guide the two induced air flows to deflect to opposite sides, and two nozzle jet outlets (1901) on two adjacent two-dimensional Laval nozzles (10) that are far away from each other simultaneously eject nozzle side jets (21) to guide the two induced air flows to deflect to the side that is close to each other.

9. A two-dimensional support plate ejector, characterized in that: The invention comprises an ejector and an active control device for ejection mixing characteristics as described in any one of claims 1 to 7.

10. The two-dimensional support plate ejector according to claim 9, characterized in that: Two support plates (4) of the ejector are arranged parallel to each other.

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