Active control device and control method for ejection mixing characteristic and ejector

Abstract

The invention belongs to the field of ejectors, and particularly relates to an active control device and method for ejection mixing characteristics and an ejector. Wherein the active control device comprises a side wall jet flow mechanism and a spray pipe jet flow mechanism; the side wall jet flow mechanism comprises side wall airflow outlets formed in the two side walls of the suction chamber. The spray pipe jet flow mechanism comprises two spray pipe jet flow outlets formed in the two sides of the two-dimensional Laval spray pipe outlet, and spray pipe side jet flows sprayed out of the two spray pipe jet flow outlets are alternately sprayed. According to the active control device for the injection mixing characteristic, provided by the invention, the injection airflow of more than one two-dimensional Laval nozzle on the two-dimensional support plate ejector and the injected airflow of more than two injected airflow sub-channels can be fully and uniformly mixed, so that the mixing characteristic is improved.

Description

Technical Field

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

[0002] The gas ejector is a gas powered device that does not contain any moving parts. Its principle is to use the viscous shear force and convection of the gas to transfer kinetic energy from the high-energy gas to the passive ejector gas, thereby increasing the pressure of the ejected gas flow. The ejector is widely used in refrigeration systems and high-altitude simulation platforms due to its advantages such as large pressure ratio, wide load matching range, fast control response, and good self-stabilization performance under variable working conditions.

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

[0004] Active control methods to improve ejector mixing efficiency, such as acoustic excitation, are not applicable to large ejectors, such as rocket high-altitude simulation platforms and chemical laser pressure recovery systems, and are currently limited to small ejectors.

[0005] Therefore, improving the mixing efficiency of large ejectors has become an urgent problem to be solved. 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 improving the mixing efficiency of a large ejector.

[0007] The present invention provides an active control device for injection mixing characteristics, including a side wall injection mechanism and a nozzle injection mechanism; The side wall jet mechanism comprises side wall airflow outlets arranged on both side walls of the suction chamber, the side wall airflow outlets eject side wall jets to insulate the suction chamber and the mixing and diffusing pipe, and at the same time guide the injected airflow of the outer injected airflow sub-channel to deflect toward the middle of the suction chamber; When only one two-dimensional Laval nozzle is provided, the nozzle jet mechanism comprises two nozzle jet outlets provided on both sides of the two-dimensional Laval nozzle outlet, the nozzle side jets ejected from the two nozzle jet outlets are alternately ejected, and the nozzle jet outlet is used to guide the induced jet airflow to deflect to the other side of the outlet; When there are more than two two-dimensional Laval nozzles arranged in parallel, the two nozzle jet outlets close to each other on two adjacent two-dimensional Laval nozzles simultaneously eject nozzle side jets, and the two nozzle jet outlets far away from each other on two adjacent two-dimensional Laval nozzles simultaneously eject nozzle side jets.

[0008] Furthermore, the side wall air flow outlets are arranged in the form of slits along the height direction of the suction chamber.

[0009] Furthermore, the side wall jet mechanism further comprises a gas collecting box and a side wall gas channel; The gas collecting box is arranged on the outer wall of the suction chamber, and the outer wall of the gas collecting box is provided with a side wall air inlet; The side wall gas channel is arranged in the wall surface of the suction chamber, one end of the side wall gas channel is connected to the gas collecting box, and the other end is connected to the side wall air flow outlet.

[0010] Furthermore, the side wall air inlet is used to connect to an external air supply device.

[0011] Furthermore, the nozzle jet outlet is arranged in a slit shape along the height direction of the two-dimensional Laval nozzle outlet.

[0012] Furthermore, the nozzle jet mechanism also includes a nozzle side gas collecting chamber, a valve mechanism and two nozzle side gas channels; The nozzle side air collecting cavity is arranged in the support plate, and one end is connected to the air collecting cavity; The two nozzle side gas channels are arranged in the support plate, one end of the two nozzle side gas channels is connected to the nozzle side gas collecting cavity, and the other end is respectively connected to one of the nozzle jet outlets; The valve mechanism is used to control only one of the nozzle side gas passages to be connected to the nozzle side gas collecting chamber at the same time.

[0013] Furthermore, the valve mechanism comprises a rotary drive mechanism, a transmission shaft and a valve plate connected in sequence; The rotary drive mechanism is arranged outside the suction chamber; The support plate and the wall surface of the suction chamber are provided with a rotation hole, and the transmission shaft seal is rotatably arranged in the rotation hole; The valve plate is rotatably arranged in the nozzle side gas collecting cavity, and the rotary drive mechanism drives the valve plate to rotate via the transmission shaft, and the valve plate blocks one nozzle side gas channel at the same time.

[0014] The present invention also provides an active control method of the ejection mixing characteristic, using the active control device of the ejection mixing characteristic, comprising the following steps: When the ejector is working, the side wall airflow outlet continuously ejects the side wall jet to insulate the suction chamber and the mixing and diffusing pipe, and at the same time guides the ejected airflow of the outer ejected airflow sub-channel to deflect toward the middle of the suction chamber, thereby improving the mixing effect of the ejected airflow and the ejecting airflow; The two nozzle jet outlets on both sides of the two-dimensional Laval nozzle outlet spray alternately, and when one of the nozzle jet outlets sprays, the induced airflow is guided to deflect to the other side of the outlet, thereby improving the mixing effect of the induced airflow and the induced airflow; When there are more than two two-dimensional Laval nozzles arranged in parallel, the two nozzle jet outlets close to each other on the two adjacent two-dimensional Laval nozzles simultaneously eject nozzle side jets to guide the two induced air flows to deflect to opposite sides, and the two nozzle jet outlets far away from each other on the two adjacent two-dimensional Laval nozzles simultaneously eject nozzle side jets to guide the two induced air flows to deflect to the close side.

[0015] The present invention also provides a support plate ejector of a two-dimensional configuration, comprising an ejector and an active control device for the above-mentioned ejection mixing characteristics.

[0016] Furthermore, two support plates of the ejector are arranged parallel to each other.

[0017] The beneficial effect of the present invention is that the active control device of the ejection mixing characteristics provided by the present invention can guide the ejected airflow of the outer ejected airflow sub-channel to deflect toward the middle of the suction chamber on the basis of insulating the side walls of the suction chamber and the mixing and diffusion pipe and improving the service life of the ejector through the setting of the side wall jet mechanism, and the nozzle jet mechanism can guide the ejected airflow at the outlet of the two-dimensional Laval nozzle to alternately deflect, or interact with the deflected ejected airflow of the outer ejected airflow sub-channel to improve the mixing effect, or interact with the ejected airflow at the outlet of the adjacent two-dimensional Laval nozzle to improve the mixing effect, so that the ejected airflow of more than one two-dimensional Laval nozzle on the two-dimensional support plate ejector can be fully and evenly mixed with the ejected airflow of more than two ejected airflow sub-channels, thereby improving its mixing characteristics. At the same time, the present application has no protruding guide structure at all, and will not generate additional airflow flow resistance, and will not affect the airflow flow effect of the two-dimensional support plate ejector. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Attached Figure 1 It is a schematic diagram of the first angle structure of the ejector in the present invention; Attached Figure 2 It is a schematic diagram of the second angle structure of the ejector in the present invention; Attached Figure 3 It is a front view of the ejector in the present invention; Attached Figure 4 For attachment Figure 3 Middle AA section view; Attached Figure 5 For attachment Figure 3 Middle BB section view; Attached Figure 6 For attachment Figure 4 Middle CC section view; Attached Figure 7 It is a structural schematic diagram of the suction chamber in the present invention; Attached Figure 8 It is a structural schematic diagram of the support plate in the present invention; Attached Fig. 9 It is a structural schematic diagram of the valve mechanism in the present invention; Attached Fig.10 It is a schematic diagram of the flow chart of the ejector at the first moment in the present invention; Attached Fig.11 It is a schematic diagram of the flow chart of the ejector at the second moment in the present invention.

[0019] In the figure, 1-inlet of the induced air flow; 2-inlet of the induced air flow; 3-air collecting chamber; 4-support plate; 5-mixing and expansion pipe; 6-air inlet of the nozzle air guide chamber; 7-nozzle air guide chamber; 8-channel of the induced air flow; 9-front guide section; 10-two-dimensional Laval nozzle; 17-suction chamber; 18-side wall jet mechanism; 1801-side wall air flow outlet; 1802-air collecting box; 1803-side wall air Body channel; 1804-side wall air inlet; 19-nozzle jet mechanism; 1901-nozzle jet outlet; 1902-nozzle side air collecting chamber; 1903-nozzle side gas channel; 1904-valve mechanism; 19041-rotational drive mechanism; 19042-transmission shaft; 19043-valve plate; 20-side wall jet; 21-nozzle side jet; 22-induced airflow; 23-induced airflow. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0021] 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 status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0022] In addition, in the present invention, descriptions such as "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0023] In the present invention, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, a physical connection, or a wireless communication connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0024] In addition, the technical solutions between the various embodiments of the present invention can be combined with each other, but it must be based on the fact that ordinary technicians in the field can implement it. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0025] As attached Figure 1 -Attached Fig.11 As shown, the present invention provides an active control device for ejection mixing characteristics, which is used for actively enhancing the mixing characteristics of the ejection airflow and the ejected airflow of the support plate ejector of a two-dimensional configuration, wherein the specific structure of the support plate ejector includes: the external configuration of the ejector is rectangular, the interior of the ejector is provided with a rectangular cavity with two ends opened, an ejected airflow inlet 1 connected to the internal cavity of the ejector is provided at one end of the opening of the ejector, and the outer size of the ejected airflow inlet 1 is the same as the size of the internal rectangular cavity of the ejector, a mixing and pressure diffusion pipe 5 connected to the internal cavity of the ejector is provided at the other end of the opening of the ejector, a rectangular air collecting cavity 3 is provided on the upper side wall of the ejector, the internal cavity of the ejector is provided with at least one vertical support plate 4, the number of the support plates 4 is preferably two, a vertical nozzle air guide cavity 7 is provided inside the support plate 4, and the two ends of the support plate 4 are connected to the inner cavity of the ejector The side walls are connected, and an induced air flow inlet 2 is opened on the side wall above the air collecting chamber 3. The air collecting chamber 3 and the nozzle air guide chamber 7 are connected through the nozzle air guide chamber air inlet 6. The induced air flow inlet 2 is opposite to the nozzle air guide chamber air inlet 6. The support plate 4 is provided with a front guide section 9 facing the induced air flow inlet 1. The front guide section 9 is set to an acute cone shape facing the induced air flow direction. The support plate 4 divides the internal cavity of the ejector into parallel equidistant induced air flow channels 8. The support plate 4 is provided with a two-dimensional Laval nozzle 10 that gradually increases along the induced air flow direction toward the mixing and expansion pipe 5. The inlet of the two-dimensional Laval nozzle 10 is connected to the nozzle air guide chamber 7, and the outlet of the two-dimensional Laval nozzle 10 is connected to the mixing and expansion pipe 5. The structure of the front guide section 9, the two-dimensional Laval nozzle 10 and the nozzle air guide chamber 7 is integrated into the support plate 4.

[0026] The active control device of the ejection mixing characteristic includes a side wall jet mechanism 18 and a nozzle jet mechanism 19; the side wall jet mechanism 18 includes a side wall airflow outlet 1801 arranged on the two side walls of the suction chamber 17, and the side wall airflow outlet 1801 ejects a side wall jet 20. The side wall jet 20 insulates the side walls of the suction chamber 17 and the mixing and diffuser pipe 5 to prevent the high-temperature ejected airflow from ablating the wall surface, thereby cooling the wall surface and improving the service life of the ejector. At the same time, it guides the ejected airflow of the outer ejected airflow sub-channel 8 to deflect toward the middle of the suction chamber 17, thereby changing the direction of the ejected airflow so that it penetrates into the core of the ejected airflow and improves the mixing efficiency. See attached Fig.10 and attached Fig.11 , the side wall jet 20 of the side wall airflow outlet 1801 marked ① guides the induced airflow 22 here to deflect toward the middle of the mixing and expanding pipe 5, and the side wall jet 20 of the side wall airflow outlet 1801 marked ⑥ guides the induced airflow 22 here to deflect toward the middle of the mixing and expanding pipe 5; 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, and the nozzle side jets 21 ejected from the two nozzle jet outlets 1901 are alternately ejected. The nozzle jet outlet 1901 is used to guide the induced airflow to deflect to the other side of the outlet. The two nozzle jet outlets 1901 on a two-dimensional Laval nozzle 10 work alternately, which can change the flow direction of the induced airflow on the outlet of the two-dimensional Laval nozzle 10, so that it can penetrate into the induced airflow, and because of the alternating work, the direction of the induced airflow will be changed alternately, on the one hand, the airflow disturbance at the mixing and diffusion pipe 5 can be increased, and its mixing effect can be improved. On the other hand, the alternately turned induced airflow is combined with the two side wall jet mechanisms 18 to change the direction of the induced airflow, so that the induced airflow and the induced airflow on both sides are alternately deflected towards each other, which greatly improves the mixing efficiency of the induced airflow and the induced airflow on both sides, and ensures the mixing uniformity of the induced airflow and the induced airflow on both sides. When there are more than two two-dimensional Laval nozzles 10 arranged in parallel, and usually 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, see Appendix Fig.11, the nozzle jet outlet 1901 marked ③ of the two-dimensional Laval nozzle 10 at the top of the figure ejects the nozzle side jet 21, which guides the induced airflow 23 ejected from the two-dimensional Laval nozzle 10 to deflect upward, and combines with the induced airflow 22 guided and deflected by the side wall jet 20 marked ① side wall airflow outlet 1801 at the top, and the two are relatively deflected, 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 at the bottom of the figure ejects the nozzle side jet 21, which guides the induced airflow 23 ejected from the two-dimensional Laval nozzle 10 to deflect downward, and combines with the induced airflow 22 guided and deflected by the side wall jet 20 marked ⑥ side wall airflow outlet 1801 at the bottom, and the two are relatively deflected, which can greatly improve their mixing effect; Two nozzle jet outlets 1901 which are far from each other on two adjacent two-dimensional Laval nozzles 10 simultaneously eject nozzle side jets 21. Fig.10 , the nozzle jet outlet 1901 marked ② of the upper two-dimensional Laval nozzle 10 in the figure ejects a nozzle side jet 21, guiding the induced airflow 23 ejected from the two-dimensional Laval nozzle 10 to deflect downward; at the same time, the nozzle jet outlet 1901 marked ⑤ of the lower two-dimensional Laval nozzle 10 in the figure ejects a nozzle side jet 21, guiding the induced airflow 23 ejected from the two-dimensional Laval nozzle 10 to deflect upward, and the induced airflows 23 of the two two-dimensional Laval nozzles 10 both rotate toward the induced airflow 22 of the middle induced airflow sub-channel 8, thereby improving the mixing effect of the two induced airflows 23 and the induced airflow 22 between them; Thus, at any time, each nozzle jet outlet 1901 ejecting a nozzle side jet 21 can cooperate with another nozzle jet outlet 1901 ejecting a nozzle side jet 21 or a side wall jet 20 of a side wall airflow outlet 1801 to enhance mixing.

[0027] The active control device of the ejection mixing characteristics provided by the present invention can guide the ejected airflow of the outer ejected airflow channel 8 to deflect toward the middle of the suction chamber 17 on the basis of insulating the side walls of the suction chamber 17 and the mixing and diffusion pipe 5 and improving the service life of the ejector through the setting of the side wall ejection mechanism 18, and the nozzle ejection mechanism 19 can guide the ejected airflow at the outlet of the two-dimensional Laval nozzle 10 to deflect alternately, or interact with the ejected airflow after deflection of the outer ejected airflow channel 8 to improve the mixing effect, or interact with the ejected airflow at the outlet of the adjacent two-dimensional Laval nozzle 10 to improve the mixing effect, so that the ejected airflow of more than one two-dimensional Laval nozzle 10 on the two-dimensional support plate ejector and the ejected airflow of more than two ejected airflow channels 8 can be fully and evenly mixed, thereby improving their mixing characteristics. At the same time, the present application has no protruding guide structure at all, will not generate additional airflow flow resistance, and will not affect the airflow flow effect of the two-dimensional support plate ejector.

[0028] 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, thereby ensuring the heat insulation and guiding effects of the suction chamber 17 and the side wall of the mixing and diffuser pipe 5 in the entire height direction.

[0029] In one embodiment, the side wall jet mechanism 18 further includes a gas collecting box 1802 and a side wall gas channel 1803; The gas collecting box 1802 is disposed on the outer wall of the suction chamber 17, and a side wall air inlet 1804 is disposed on the outer wall of the gas collecting box 1802, and the side wall air inlet 1804 is used to connect to an external air supply device; The side wall gas channel 1803 is arranged in the wall surface of the suction chamber 17 , and 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 .

[0030] 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 sprayed out from the side wall air flow outlet 1801.

[0031] In one embodiment, the side wall air inlet 1804 is used to connect to an external air supply device, which provides a high-pressure insulating airflow, such as nitrogen, which can further reduce the temperature of the side walls of the suction chamber 17 and the mixing and diffuser pipe 5.

[0032] In one embodiment, referring to the attached Figure 7 The nozzle jet outlet 1901 is arranged in a slit shape along the outlet height direction of the two-dimensional Laval nozzle 10, so that the induced airflow can be guided in the entire height direction of the nozzle jet outlet 1901, thereby improving the guiding effect of the induced airflow.

[0033] In one embodiment, referring to the attached Figure 8 and attached Fig. 9 The nozzle jet mechanism 19 also includes 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 thereof 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. At this time, the nozzle side jet 21 ejected from the nozzle jet outlet 1901 has the same source as the ejection airflow ejected from the two-dimensional Laval nozzle 10, both of which are from the gas collecting cavity 3. On the one hand, it can avoid the excessive content of other gases in the ejector, and on the other hand, it can greatly utilize the original structure of the two-dimensional support plate ejector to reduce the complexity of the gas supply structure of the nozzle jet outlet 1901; The valve mechanism 1904 is used to control only one of the nozzle side gas passages 1903 to be connected to the nozzle side gas collecting chamber 1902 at the same time, thereby ensuring that the two nozzle jet outlets 1901 work alternately.

[0034] 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; The rotary drive mechanism 19041 is arranged outside the suction chamber 17, which, on the one hand, facilitates the disassembly, assembly and maintenance of the rotary drive mechanism 19041, and on the other hand, can avoid the rotary drive mechanism 19041 being arranged in the nozzle side air collecting cavity 1902 to avoid being worn by the induced airflow; 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 disposed in the nozzle side gas collecting chamber 1902, and the rotation drive mechanism 19041 drives the valve plate 19043 to rotate through the transmission shaft 19042, and the valve plate 19043 blocks one nozzle side gas channel 1903 at the same time. Preferably, the rotation drive mechanism 19041 is a swing motor, which drives the valve plate 19043 to swing back and forth, so that the two nozzle side gas channels 1903 are opened alternately.

[0035] The present invention also provides an active control method of the ejection mixing characteristic, using the active control device of the ejection mixing characteristic, comprising 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 diffusing pipe 5, and at the same time guides 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 ejected airflow; The 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 to the other side of the outlet, 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, the two nozzle jet outlets 1901 close to each other on the two adjacent two-dimensional Laval nozzles 10 simultaneously eject nozzle side jets 21 to guide the two induced air flows to deflect to opposite sides; the two nozzle jet outlets 1901 far away from each other on the two adjacent two-dimensional Laval nozzles 10 simultaneously eject nozzle side jets 21 to guide the two induced air flows to deflect to the close side.

[0036] 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 support plate ejector includes: the external configuration of the ejector is rectangular, the interior of the ejector is provided with a rectangular cavity with two ends opened, an ejector air flow inlet 1 is provided at one end opening of the ejector and connected with the internal cavity of the ejector, the outer size of the ejector air flow inlet 1 is the same as the size of the internal rectangular cavity of the ejector, the other end opening of the ejector is provided with a mixing and pressure diffusion pipe 5 connected with the internal cavity of the ejector, a rectangular air collecting cavity 3 is provided on the upper side wall of the ejector, the internal cavity of the ejector is provided with at least one vertical support plate 4, the number of support plates 4 is preferably two, a vertical nozzle air guide cavity 7 is provided inside the support plate 4, the two ends of the support plate 4 are connected to the inner wall of the ejector, and an ejector air flow inlet is opened on the side wall above the air collecting cavity 3 2, the air collecting cavity 3 and the nozzle air guide cavity 7 are connected through the nozzle air guide cavity air inlet 6, the ejection air flow inlet 2 is directly opposite to the nozzle air guide cavity air inlet 6, the support plate 4 is provided with a front end guide section 9 in the direction of the ejected air flow inlet 1, the front end guide section 9 is arranged in an acute cone shape in the direction of the ejected air flow, the support plate 4 divides the internal cavity of the ejector into parallel equally spaced ejected air flow channels 8, the support plate 4 is provided with a two-dimensional Laval nozzle 10 which gradually increases in size along the ejected 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 guide cavity 7, the outlet of the two-dimensional Laval nozzle 10 is connected to the mixing and expanding pipe 5, the front end guide section 9, the two-dimensional Laval nozzle 10 and the nozzle air guide cavity 7 are integrated into the support plate 4.

[0037] In one embodiment, two support plates 4 of the ejector are arranged in parallel to each other. In this case, three parallel ejected gas flow channels 8 are arranged in parallel at equal intervals.

[0038] The above is only an embodiment and does not limit the present invention in any way. Any person skilled in the art can use the above disclosed technical contents to make many possible changes, modifications or modifications to the technical solutions of the present invention into equivalent embodiments of equivalent changes without departing from the scope of the technical solutions of the present invention. Therefore, any simple modification, equivalent changes and modifications made to the above embodiments according to the technical essence of the present invention without departing from the content of the technical solutions of the present invention shall fall within the scope of protection of the technical solutions of the present invention.

Claims

1. An active control device for injection mixing characteristics, 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 other side of the outlet; 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 to the other side of the outlet, 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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