An ejector structure with self-adapting nozzle area

Abstract

The application discloses an ejector structure with self-adaptive nozzle area adjustment, and belongs to the technical field of ejectors.The ejector structure comprises an ejector shell, the ejector shell is internally provided with a primary flow channel, a secondary flow channel and a collecting cavity, the primary flow channel is communicated with the collecting cavity; a nozzle is installed in the collecting cavity, the nozzle is located above the secondary flow channel, the nozzle is internally provided with an elastic telescopic ejector pin, a distal end of the nozzle is an outlet part, a cross section of the outlet part is a rectangle, the ejector pin is provided with a pin body part and a distal end pin tip part, the diameter of the pin tip part gradually decreases from the proximal end to the distal end, the pin tip part slides in the outlet part, the maximum diameter of the pin tip part is smaller than the inner diameter of the outlet part, and the outer diameter of the pin body part is larger than the inner diameter of the outlet part.The ejector structure with self-adaptive nozzle area adjustment solves the problem that the existing nozzle has a fixed cross section, the throat area is constant, and the working condition adaptability is poor.

Description

Technical Field

[0001] This invention relates to the field of ejector technology, specifically to an ejector structure that adaptively adjusts the nozzle area. Background Technology

[0002] In transcritical carbon dioxide heat pump systems, the ejector significantly improves energy efficiency by recovering throttling pressure energy, and its performance is primarily dependent on the nozzle's operating condition. Existing nozzles have a fixed cross-section and a constant throat area, resulting in poor adaptability to various operating conditions. When system load or upstream pressure fluctuates, the outlet velocity and negative pressure change drastically, leading to a significant drop in ejector efficiency. To maintain efficiency, the inlet pressure often needs to be increased, resulting in energy waste. Furthermore, this can easily trigger airflow pulsation and surge, affecting system stability.

[0003] If an active adjustable nozzle is replaced, although the cross-sectional area can be changed by driving the adjusting cone through sensors and actuators, the system is complex, relying on sensors, controllers and motors, which increases the size, potential for failure and cost; the response is lagging, there is a delay in the transmission of electrical signals and mechanical action, and it is impossible to compensate for dynamic fluctuations instantaneously; the adjustment is discontinuous, limited by the stepped structure of "cylindrical surface + conical surface", the adjustment is step-like, and it is difficult to achieve smooth linear control.

[0004] Therefore, it is necessary to provide an ejector structure that adaptively adjusts the nozzle area to solve the above problems. Summary of the Invention

[0005] In view of the above-mentioned problems in the prior art, the purpose of the present invention is to provide an ejector structure that adaptively adjusts the nozzle area to solve the problems mentioned in the background art.

[0006] The technical solution adopted by the present invention to solve its technical problem is: an ejector structure for adaptively adjusting nozzle area, including an ejector housing, wherein the ejector housing has a primary flow channel, a secondary flow channel and a collecting cavity, and the primary flow channel and the collecting cavity are connected. A nozzle is installed inside the collecting cavity. The nozzle is located above the secondary flow channel. The nozzle has an elastically telescopic ejector pin. The distal end of the nozzle is the outlet. The cross-section of the outlet is rectangular. The ejector pin has a body and a distal tip. The diameter of the tip gradually decreases from near to far. The tip slides inside the outlet. The maximum diameter of the tip is smaller than the inner diameter of the outlet. The outer diameter of the body is smaller than the inner diameter of the outlet. When the fluid flow rate increases, the fluid pressure at the nozzle inlet rises. The pressure force is greater than the elastic force of the elastic element, which pushes the ejector pin to move to the left along the flow channel axis. The effective cross-sectional area of ​​the outlet increases accordingly, reducing the fluid flow resistance inside the nozzle and causing the pressure difference before and after the nozzle to drop back to the set constant value. When the fluid flow rate decreases, the fluid pressure at the nozzle inlet decreases. The elastic force of the elastic element is greater than the pressure force, pulling the ejector pin to move to the right along the flow channel axis. The effective cross-sectional area of ​​the outlet decreases accordingly, the flow velocity increases, the kinetic energy of the outlet increases, and the pressure decreases, making the pressure at the outlet less than that in the secondary flow channel, thus entraining the secondary flow and preventing backflow.

[0007] Furthermore, a sleeve end cap is fixedly connected to one side of the ejector housing, a mounting seat is provided inside the collecting cavity, the ejector pin is slidably installed in the mounting seat, the elastic element is a spring located inside the mounting seat, one end of the spring abuts against the inner wall of the sleeve end cap, and the other end abuts against the ejector pin.

[0008] Furthermore, one end of the mounting base is provided with several air inlets along the circumference. The air inlets are located below the primary inlet. The ejector pin also has a contact portion. The pin body is located between the contact portion and the pin tip. The diameter of the contact portion gradually decreases from back to front and is located below the air inlets.

[0009] Furthermore, the nozzle also includes a main body and a transition section. The inner wall diameter of the main body is uniform, and the diameter of the transition section gradually decreases from back to front. The transition section is located between the main body and the outlet section.

[0010] Furthermore, a working chamber is provided inside the ejector housing, which is connected to the secondary flow channel and located in front of the nozzle; The working chamber has a mixing zone and a diffusion zone. The mixing zone is located on one side of the diffusion zone and close to the nozzle. The diameter of the inner wall of the diffusion zone gradually increases from front to back.

[0011] Furthermore, it also includes an end face sealing ring and a nozzle sealing ring. The end face sealing ring is located between the ejector housing and the sleeve end cap. One end of the end face sealing ring abuts against the ejector housing, and the other end abuts against the sleeve end cap. The nozzle sealing ring is nested at the tail of the nozzle and located inside the collecting cavity. One end of the nozzle sealing ring abuts against the inner wall of the collecting cavity, and the other end abuts against the nozzle.

[0012] Furthermore, it also includes a primary flow inlet and a pressure sensor, the primary flow inlet being located on the side of the ejector housing and the pressure sensor being located on the top of the ejector housing; The primary flow channel has a connected inlet channel and a pressure sensing channel. The inlet channel is connected to the primary flow inlet, and the pressure sensor is connected to the pressure sensing channel.

[0013] Furthermore, the top of the ejector housing also has a solenoid valve, a proportional regulating valve, a temperature sensor, and a safety valve that are connected to the primary flow channel, as well as an outlet and a secondary flow inlet that are connected to the secondary flow channel.

[0014] The beneficial effects of this invention are as follows: The ejector structure with adaptive nozzle area adjustment provided by this invention senses changes in flow rate in real time and dynamically adjusts the cross-sectional area of ​​the flow channel through a built-in force balance feedback mechanism. Under low flow conditions, it automatically reduces the flow cross-section to forcibly increase the flow velocity, ensuring that the nozzle outlet always maintains the optimal strong negative pressure state, thereby maximizing the secondary flow entrainment efficiency and recycling rate. At the same time, this dynamic adjustment ensures that the pressure difference before and after the nozzle is always higher than the set threshold from the physical mechanism of the spring, fundamentally eliminating the conditions for media backflow, realizing unidirectional stable delivery over a wide flow range, and achieving both high-efficiency ejection and intrinsically safe backflow prevention functions without the need for additional check valves. This significantly improves the overall energy efficiency and operational reliability of the system. Under low flow conditions, it automatically reduces the cross-sectional area to increase the flow velocity and enhance the negative pressure, preventing backflow and maintaining entrainment. Under high flow conditions, it automatically increases the cross-sectional area to reduce resistance, avoiding excessive throttling and ensuring flow output. It always maintains a constant pressure difference before and after the nozzle to ensure efficient entrainment of secondary flow under any conditions. It can cover the entire operating range from extremely low flow rate to full load, and is especially suitable for wide temperature range operating scenarios such as transcritical carbon dioxide heat pumps. It can accurately match the changes in fluid state under different operating conditions, solve the problem of "excessive throttling at low flow rate and insufficient throttling at high flow rate" of traditional nozzles under wide operating conditions, and greatly improve the adaptability and operating efficiency of the system under complex operating conditions. Employing a purely physical force balance principle, it requires no sensor signal acquisition, controller calculation, or motor drive execution. The displacement of the ejector pin occurs almost synchronously with changes in fluid pressure. The system exhibits extremely high stability, effectively suppressing airflow pulsation, eliminating surge risk, and ensuring the continuous and stable operation of downstream processes. By smoothly and continuously adjusting the cross-sectional area, severe turbulence, eddy shedding, and shock wave oscillations generated at the fixed throttling orifice are avoided. This improves the working environment for operators and meets increasingly stringent environmental and noise standards.

[0015] In addition to the objectives, features, and advantages described above, the present invention has other objectives, features, and advantages. The invention will now be described in further detail with reference to the figures. Attached Figure Description

[0016] The accompanying drawings, which form part of this specification, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings: Figure 1 This is an overall schematic diagram of the present invention; Figure 2 This is a schematic diagram of the ejector housing of the present invention; Figure 3 This is a schematic diagram of the top of the ejector housing of the present invention; Figure 4 For the present invention Figure 3 Schematic diagram of the cross section along line A in the middle; Figure 5 This is a schematic diagram of the nozzle of the present invention; Figure 6 This is a schematic cross-sectional view of the nozzle of the present invention; Figure 7 This is a schematic cross-sectional view of the ejector of the present invention; Figure 8 This is a schematic diagram showing the position of the ejector pin when the gas flow rate is relatively low according to the present invention; Figure 9 This is a schematic diagram showing the position of the ejector pin when the gas flow rate is large according to the present invention; The following are the labeling elements in the figure: 1. Ejector housing; 101. Collecting chamber; 2. Primary flow inlet; 3. Pressure sensor; 4. Solenoid valve; 5. Proportional regulating valve; 6. Temperature sensor; 7. Safety valve; 8. Outlet; 9. Sleeve end cap; 10. Secondary flow inlet; 11. Primary flow channel; 111. Inlet channel; 112. Pressure sensing channel; 12. Secondary flow channel; 13. Working chamber; 131. Mixing zone; 132. Diffuser zone; 14. Mounting base; 141. Air inlet; 15. Ejector pin; 1501. Contact part; 1502. Needle body; 1503. Needle tip; 16. Spring; 17. Nozzle; 1701. Main body; 1702. Transition part; 1703. Outlet; 18. End face sealing ring; 19. Nozzle sealing ring. Detailed Implementation

[0017] It should be noted that, unless otherwise specified, the embodiments and features described in the present invention can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0018] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0019] like Figure 1-7 As shown, the present invention provides a technical solution: an ejector structure for adaptively adjusting nozzle area, including an ejector housing 1, wherein the ejector housing 1 has a primary flow channel 11, a secondary flow channel 12 and a collecting cavity 101, and the primary flow channel 11 and the collecting cavity 101 are connected. A nozzle 17 is installed inside the collecting cavity 101. The nozzle 17 is located above the secondary flow channel 12. The nozzle 17 has an elastically telescopic ejector pin 15. The distal end of the nozzle 17 is the outlet 1703. The cross-section of the outlet 1703 is rectangular. The ejector pin 15 has a needle body 1502 and a needle tip 1503 at its distal end. The diameter of the needle tip 1503 gradually decreases from near to far. The needle tip 1503 slides inside the outlet 1703. The maximum diameter of the needle tip 1503 is smaller than the inner diameter of the outlet 1703. The outer diameter of the needle body 1502 is smaller than the inner diameter of the outlet 1703. When the fluid flow rate increases, the fluid pressure at the inlet of nozzle 17 increases. The pressure force is greater than the elastic force of the elastic element, which pushes the ejector pin 15 to move to the left along the flow channel axis. The effective cross-sectional area of ​​the outlet 1703 increases accordingly, reducing the fluid flow resistance inside nozzle 17 and causing the pressure difference before and after nozzle 17 to drop back to the set constant value. When the fluid flow rate decreases, the fluid pressure at the inlet of nozzle 17 decreases, and the elastic force of the elastic element is greater than the pressure force, pulling the ejector pin 15 to move to the right along the flow channel axis. The effective cross-sectional area of ​​the outlet 1703 decreases accordingly. According to Bernoulli's equation and the law of conservation of energy, the flow velocity at the outlet 1703 increases, the kinetic energy increases, and the pressure decreases, making the pressure at the outlet 1703 less than the pressure in the secondary flow channel 12. This causes the secondary flow to be drawn in, preventing backflow, that is, preventing the fluid at the outlet 1703 from flowing directly out of the inlet of the secondary flow channel 12.

[0020] A sleeve end cap 9 is fixedly connected to one side of the ejector housing 1. A mounting base 14 is provided in the collecting cavity 101. The ejector pin 15 is slidably installed in the mounting base 14. The elastic element is a spring 16, which is located in the mounting base 14. One end of the spring 16 abuts against the inner wall of the sleeve end cap 9, and the other end abuts against the ejector pin 15.

[0021] One end of the mounting base 14 is provided with a plurality of air inlets 141 along the circumferential direction. The air inlets 141 are located below the primary inlet 2. The ejector pin 15 also has a contact portion 1501. The needle body portion 1502 is located between the contact portion 1501 and the needle tip portion 1503. The diameter of the contact portion 1501 gradually decreases from back to front and is located below the air inlets 141.

[0022] The nozzle 17 also includes a main body 1701 and a transition section 1702. The inner wall diameter of the main body 1701 is uniform, and the diameter of the transition section 1702 gradually decreases from back to front. The transition section 1702 is located between the main body 1701 and the outlet section 1703.

[0023] The ejector housing 1 also has a working chamber 13, which is connected to the secondary flow channel 12 and is located in front of the nozzle 17. The working chamber 13 has a mixing zone 131 and a diffusion zone 132. The mixing zone 131 is located on one side of the diffusion zone 132 and close to the nozzle 17. The diameter of the inner wall of the diffusion zone 132 gradually increases from front to back.

[0024] The end face sealing ring 18 and the nozzle sealing ring 19 are located between the ejector housing 1 and the sleeve end cover 9. One end of the end face sealing ring 18 abuts against the ejector housing 1 and the other end abuts against the sleeve end cover 9. The nozzle sealing ring 19 is nested at the tail of the nozzle 17 and located in the collecting cavity 101. One end of the nozzle sealing ring 19 abuts against the inner wall of the collecting cavity 101, and the other end abuts against the nozzle 17.

[0025] The primary inlet 2 and the pressure sensor 3 are located on the side of the ejector housing 1 and on the top of the ejector housing 1. The primary flow channel 11 has a connected inlet channel 111 and a pressure sensing channel 112. The inlet channel 111 is connected to the primary flow inlet 2, and the pressure sensor 3 is connected to the pressure sensing channel 112.

[0026] The top of the ejector housing 1 also has a solenoid valve 4, a proportional regulating valve 5, a temperature sensor 6 and a safety valve 7 connected to the primary flow channel 11, as well as an outlet 8 and a secondary flow inlet 10 connected to the secondary flow channel 12.

[0027] In one embodiment, the ejector operates as follows:

[0028] Specifically, S1. Energy Conversion and Negative Pressure Formation: High-pressure working fluid enters nozzle 17. Due to the drastic reduction in the cross-sectional area of ​​nozzle 17, the pressure energy of the working fluid is converted into kinetic energy, and it is ejected at extremely high speed. This creates a significant low-pressure zone in the area of ​​the outlet 1703. This low-pressure zone is the power source for the ejector to "draw in" external fluid.

[0029] S2. Fluid intake: The receiving chamber is located between the collecting chamber 101 and the working chamber 13. Since the pressure inside the receiving chamber is much lower than that of the external environment, the ejector fluid is automatically drawn into the receiving chamber from the secondary inlet 10 under the action of the pressure difference. At this time, the working fluid is a high-speed jet, while the ejected fluid has a lower velocity, and the two begin to come into contact.

[0030] S3. Momentum Exchange and Mixing: Two fluid streams enter mixing zone 131. The high-speed working fluid, through turbulent diffusion, entrains the surrounding low-speed fluid. A vigorous momentum exchange occurs between them. The working fluid decelerates, its kinetic energy decreases, while the entrained fluid accelerates, its kinetic energy increases. At the outlet of mixing zone 131, the velocities of the two fluid streams tend to converge, forming a homogeneous mixture. During this process, the pressure of the mixed fluid is typically slightly higher than the pressure at the intake, but still lower than the pressure at the final outlet 8.

[0031] S4. Kinetic Energy Recovery and Pressurization: The mixed fluid enters the diffuser zone 132, where the cross-sectional area gradually increases. As the flow area increases, the flow velocity of the mixed fluid gradually decreases. According to the law of conservation of energy, the reduced kinetic energy is converted back into pressure energy. At the outlet of the diffuser zone 132, the pressure of the mixed fluid increases significantly and is eventually discharged from the ejector. The pressure at the outlet 8 is higher than the inlet pressure of the ejected fluid, but lower than the inlet pressure of the working fluid.

[0032] In another embodiment, how to achieve dynamic equilibrium

[0033] Specifically, this variable cross-section constant pressure difference nozzle 17 operates based on the dynamic balance principle of fluid pressure and spring force 16. Its core function is to adjust the effective cross-sectional area of ​​the flow channel through the reciprocating motion of the ejector pin 15, maintaining a constant pressure difference across the nozzle 17. The specific working process is as follows: S1. When the fluid flow rate increases, the fluid pressure at the inlet of nozzle 17 increases. The pressure force is greater than the elastic force of spring 16, which pushes the ejector pin 15 to move to the left along the flow channel axis. The effective cross-sectional area of ​​the flow channel increases accordingly, reducing the fluid flow resistance inside nozzle 17 and causing the pressure difference before and after nozzle 17 to drop back to the set constant value. S2. When the fluid flow rate decreases, the fluid pressure at the inlet of nozzle 17 decreases, the elastic force of spring 16 is greater than the pressure force, and pulls the ejector pin 15 to move to the right along the flow channel axis. The effective cross-sectional area of ​​the flow channel decreases accordingly. According to Bernoulli's equation and the law of conservation of energy, the flow velocity at the outlet 1703 increases, the kinetic energy increases, and the pressure decreases, making the pressure at the outlet 1703 less than the pressure in the secondary flow channel 12. This causes the secondary flow to be drawn in, preventing backflow, that is, preventing the fluid at the outlet 1703 from flowing directly out of the inlet of the secondary flow channel 12. S3. When the fluid flow rate is extremely low or the pressure is insufficient, the spring force of the spring 16 completely overcomes the pressure force, pushing the ejector pin 15 to close the flow channel. The needle body 1502 is located inside the outlet 1703, realizing the automatic closing of the nozzle 17 and preventing the medium from flowing back.

[0034] In summary, this invention uses a built-in force balance feedback mechanism to sense flow rate changes in real time and dynamically adjust the flow channel cross-sectional area. Under low flow conditions, it automatically reduces the flow cross-section to forcibly increase the flow velocity, ensuring that the outlet 1703 of the nozzle 17 always maintains the optimal strong negative pressure state, thereby maximizing the secondary flow entrainment efficiency and recycling rate. At the same time, this dynamic adjustment ensures that the pressure difference before and after the nozzle 17 is always higher than the set threshold from the physical mechanism of the spring 16, fundamentally eliminating the medium backflow condition and realizing unidirectional stable delivery over a wide flow range. It can achieve both high-efficiency ejection and intrinsically safe backflow prevention functions without the need for additional check valves, significantly improving the overall energy efficiency and operational reliability of the system. Under low flow conditions, the cross-sectional area will automatically decrease, thereby increasing the flow velocity and enhancing the negative pressure, which can prevent backflow and maintain entrainment; under high flow conditions, the cross-sectional area will automatically increase, thereby reducing resistance, avoiding excessive throttling and ensuring flow output; the pressure difference before and after nozzle 17 is always kept constant to ensure efficient entrainment of secondary flow under any conditions. It can cover the entire operating range from extremely low flow rate to full load, and is especially suitable for wide temperature range operating scenarios such as transcritical carbon dioxide heat pumps. It can accurately match the fluid state changes under different operating conditions, solve the problem of "excessive throttling at low flow rate and insufficient throttling at high flow rate" of traditional nozzle 17 under wide operating conditions, and greatly improve the system's adaptability and operating efficiency under complex operating conditions. Employing a purely physical force balance principle, it requires no sensor signal acquisition, controller calculation, or motor drive execution. The displacement of the ejector pin 15 occurs almost synchronously with changes in fluid pressure. The system exhibits extremely high stability, effectively suppressing airflow pulsation, eliminating surge risk, and ensuring the continuous and stable operation of downstream processes. By smoothly and continuously adjusting the cross-sectional area, severe turbulence, eddy shedding, and shock wave oscillations generated at the fixed throttling orifice are avoided. This improves the working environment for operators and meets increasingly stringent environmental and noise standards.

[0035] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. An ejector structure that adaptively adjusts the nozzle area, characterized in that: Includes an ejector housing (1), which has a primary flow channel (11), a secondary flow channel (12) and a collecting cavity (101) inside, and the primary flow channel (11) and the collecting cavity (101) are connected; A nozzle (17) is installed in the collecting cavity (101). The nozzle (17) is located above the secondary flow channel (12). The nozzle (17) has an elastically telescopic ejector pin (15). The distal end of the nozzle (17) is an outlet (1703). The cross-section of the outlet (1703) is rectangular. The ejector pin (15) has a needle body (1502) and a needle tip (1503) at its distal end. The diameter of the needle tip (1503) gradually decreases from near to far. The needle tip (1503) slides in the outlet (1703). The maximum diameter of the needle tip (1503) is smaller than the inner diameter of the outlet (1703). The outer diameter of the needle body (1502) is smaller than the inner diameter of the outlet (1703). When the fluid flow rate increases, the fluid pressure at the inlet of the nozzle (17) increases. The pressure force is greater than the elastic force of the elastic element, which pushes the ejector pin (15) to move to the left along the flow channel axis. The effective cross-sectional area of ​​the outlet (1703) increases accordingly, reducing the fluid flow resistance inside the nozzle (17) and causing the pressure difference before and after the nozzle (17) to drop back to the set constant value. When the fluid flow rate decreases, the fluid pressure at the nozzle (17) inlet decreases, the elastic force of the elastic element is greater than the pressure force, and the ejector pin (15) is pulled to the right along the flow channel axis. The effective cross-sectional area of ​​the outlet (1703) decreases accordingly, the flow velocity increases, the kinetic energy of the outlet (1703) increases, and the pressure decreases, so that the pressure in the outlet (1703) is less than the pressure in the secondary flow channel (12), thus entraining the secondary flow and preventing backflow.

2. The ejector structure with adaptive nozzle area adjustment according to claim 1, characterized in that: A sleeve end cap (9) is fixedly connected to one side of the ejector housing (1). The collecting cavity (101) has a mounting base (14). The ejector pin (15) is slidably installed in the mounting base (14). The elastic element is a spring (16), which is located in the mounting base (14). One end of the spring (16) abuts against the inner wall of the sleeve end cap (9), and the other end abuts against the ejector pin (15).

3. The ejector structure with adaptive nozzle area adjustment according to claim 2, characterized in that: The mounting base (14) has a plurality of air inlets (141) circumferentially opened at one end. The air inlets (141) are located below the primary inlet (2). The ejector pin (15) also has a contact part (1501). The needle body part (1502) is located between the contact part (1501) and the needle tip part (1503). The diameter of the contact part (1501) gradually decreases from back to front and is located below the air inlets (141).

4. The ejector structure with adaptive nozzle area adjustment according to claim 1, characterized in that: The nozzle (17) also includes a main body (1701) and a transition part (1702). The inner wall diameter of the main body (1701) is uniform, and the diameter of the transition part (1702) gradually decreases from back to front. The transition part (1702) is located between the main body (1701) and the outlet part (1703).

5. The ejector structure with adaptive nozzle area adjustment according to claim 1, characterized in that: The ejector housing (1) is also provided with a working chamber (13), which is connected to the secondary flow channel (12) and located in front of the nozzle (17); The working chamber (13) has a mixing zone (131) and a diffusion zone (132). The mixing zone (131) is located on one side of the diffusion zone (132) and close to the nozzle (17). The diameter of the inner wall of the diffusion zone (132) gradually increases from front to back.

6. The ejector structure with adaptive nozzle area adjustment according to claim 5, characterized in that: It also includes an end face sealing ring (18) and a nozzle sealing ring (19). The end face sealing ring (18) is located between the ejector housing (1) and the sleeve end cap (9). One end of the end face sealing ring (18) abuts against the ejector housing (1) and the other end abuts against the sleeve end cap (9). The nozzle sealing ring (19) is nested at the tail of the nozzle (17) and located in the collecting cavity (101). One end of the nozzle sealing ring (19) abuts against the inner wall of the collecting cavity (101), and the other end abuts against the nozzle (17).

7. The ejector structure with adaptive nozzle area adjustment according to claim 1, characterized in that: It also includes a primary inlet (2) and a pressure sensor (3), the primary inlet (2) being located on the side of the ejector housing (1) and the pressure sensor (3) being located on the top of the ejector housing (1); The primary flow channel (11) has a connected inlet channel (111) and a pressure sensing channel (112). The inlet channel (111) is connected to the primary flow inlet (2), and the pressure sensor (3) is connected to the pressure sensing channel (112).

8. The ejector structure with adaptive nozzle area adjustment according to claim 1, characterized in that: The top of the ejector housing (1) also has a solenoid valve (4), a proportional regulating valve (5), a temperature sensor (6) and a safety valve (7) connected to the primary flow channel (11), as well as an outlet (8) and a secondary flow inlet (10) connected to the secondary flow channel (12).

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