Exhaust injection device with adjustable injection port section

Abstract

The invention belongs to the technical field of engine simulation tests, and provides an exhaust injection device with an adjustable injection port section, which is characterized in that one end of a switching section is butted with one end of an adjusting section, the other end of the adjusting section is connected with a first flange piece, and the side wall of the first flange piece is connected with an adjusting upper cover plate and an adjusting lower cover plate; the side walls of the upper adjusting cover plate and the lower adjusting cover plate are both provided with coaxially-arranged notches, and the notch of the upper adjusting cover plate is in butt joint with the notch of the lower adjusting cover plate to form an exhaust injection opening. According to the invention, by adjusting the position change of the adjusting upper cover plate and the adjusting lower cover plate along the limiting strip hole, the position of the exhaust injection port formed by the gaps of the adjusting upper cover plate and the adjusting lower cover plate is shifted so as to adapt to engines with different exhaust tail nozzle central positions to carry out tests; meanwhile, the size of the cross section area of the exhaust injection port is adjusted so as to adapt to engines with exhaust tail nozzles with different cross section sizes to carry out tests.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of engine simulation test, and particularly relates to an exhaust injection device with adjustable injection port section. BACKGROUND

[0002] When conducting high-altitude simulation test on an aero-engine, two kinds of air intake condition simulation techniques are generally adopted, i.e., direct connection of the engine air inlet with the air supply pipeline or non-direct connection of the engine air inlet with the air supply pipeline. In the non-direct connection technique, in order to simulate the intake and exhaust environment conditions of the high Mach number state point of the engine, a small-gap exhaust injection device is usually installed behind the exhaust tail nozzle of the engine, so that when the air extraction unit in the exhaust pipeline is working, a sufficient atmospheric pressure difference can be generated between the outlet of the exhaust tail nozzle of the engine and the environment at the engine air inlet, thereby meeting the required intake and exhaust environment conditions of the high Mach number state point.

[0003] At present, the exhaust injection device is generally composed of an exhaust injection cylinder and an exhaust blocking plate. The exhaust blocking plate is installed on the flange connection surface of the test stand exhaust cylinder, and the exhaust blocking plate is provided with an exhaust adapter hole matched with the center position and section size of the exhaust tail nozzle of the test engine. One end of the exhaust injection cylinder is installed on the exhaust adapter hole of the exhaust blocking plate, and the other end of the exhaust injection cylinder is non-contact connected with the exhaust tail nozzle of the engine. The exhaust of the engine is first discharged into the exhaust adapter hole of the exhaust blocking plate through the exhaust injection cylinder, and then discharged into the test stand exhaust cylinder and finally discharged into the atmospheric environment through the test stand exhaust tower.

[0004] However, the existing exhaust injection device needs to be customized according to the aero-engine and the installation state, and does not have the function of adjusting the center position and the section area size of the exhaust injection port. That is, when the test stand replaces different aero-engines or the installation state of the engine changes the vertical height or horizontal position of the exhaust center, a new set of exhaust injection device needs to be designed and processed to meet the test requirements, which increases the manufacturing cost and prolongs the modification cycle. Therefore, it is urgent to overcome the defects of the existing technology in the technical field. SUMMARY

[0005] In view of the above problems, the present application provides an exhaust injection device with adjustable injection port section, which comprises a adapter section and an adjusting section. One end of the adapter section is connected to one end of the adjusting section, and the inner cavity of the adapter section is connected to the inner cavity of the adjusting section to form a gas flow chamber. The other end of the adjusting section is coaxially connected to a first flange. The side wall of the first flange is slidingly connected to an adjusting upper cover plate and an adjusting lower cover plate. The sliding direction of the adjusting upper cover plate and the adjusting lower cover plate is a first direction. The side wall of the adjusting upper cover plate and the adjusting lower cover plate is provided with a plurality of limiting strip holes extending along the first direction. The inner wall of the limiting strip holes is sleeved with a third screw threadedly connected with the flange. The side walls of the adjusting upper cover plate and the adjusting lower cover plate are provided with coaxially arranged notches, and the notches of the adjusting upper cover plate are butted against the notches of the adjusting lower cover plate to form an exhaust injection port corresponding to the gas flow chamber.

[0006] Further, the cross sections of the adjusting upper cover plate and the adjusting lower cover plate are both annular structures, upper notches are arranged at both ends of the adjusting upper cover plate to form upper protrusions, and lower notches are arranged at both ends of the adjusting lower cover plate to form lower protrusions. The upper notches and the upper protrusions correspond to the lower protrusions and the lower notches respectively to form a plug-in connection.

[0007] Further, the thickness of the upper protrusion is less than the thickness of the adjusting upper cover plate, and the side wall of the upper protrusion away from the adjusting section is coplanar with the outer wall of the adjusting upper cover plate. The adjusting lower cover plate is connected with receiving portions at both ends, the receiving portions are located at the lower notches, and one side wall of the receiving portion is in abutment with the side wall of the upper protrusion, and the other side wall of the receiving portion is in abutment with the side wall of the first flange.

[0008] Further, the sealing gasket plate includes a strip-shaped portion and a semicircular portion connected to both ends of the strip-shaped portion, the limiting strip holes are both semicircular structures, and the center distance of the centers of the two semicircular portions is greater than the center distance of the centers of the two semicircular ends of the limiting strip holes.

[0009] Further, the sealing gasket plate includes a strip-shaped portion and a semicircular portion connected to both ends of the strip-shaped portion, the limiting strip holes are both semicircular structures, and the center distance of the centers of the two semicircular portions is greater than the center distance of the centers of the two semicircular ends of the limiting strip holes.

[0010] Further, the adapter section is coaxially connected with a second flange at one end facing the adjusting section, the adjusting section is coaxially connected with a third flange at one end facing the adapter section, and the second flange is butted against the third flange and is fixedly connected through a plurality of second bolts.

[0011] Further, the plurality of second bolts are arranged in a circumferential array about the axis of the third flange.

[0012] Further, the adapter section is coaxially connected with a second flange at one end facing the adjusting section, the adjusting section is coaxially connected with a third flange at one end facing the adapter section, and the second flange is butted against the third flange and is fixedly connected through a plurality of second bolts.

[0013] Further, the notches of the adjusting upper cover plate and the adjusting lower cover plate are both semicircular structures, and when the spacing between the adjusting upper cover plate and the adjusting lower cover plate is at a maximum, the exhaust injection port is a circular structure.

[0014] Further, the plurality of limiting strip holes of the adjusting upper cover plate are arranged in a circumferential array about the axis of the notch of the adjusting upper cover plate, and the plurality of limiting strip holes of the adjusting lower cover plate are arranged in a circumferential array about the axis of the notch of the adjusting lower cover plate.

[0015] Compared with the prior art, the embodiments of the present application have at least the following advantages: The exhaust injection device with adjustable injection port section of the present application adjusts the position of the exhaust injection port axis by adjusting the moving distance of the adjusting upper cover plate and the adjusting lower cover plate in the first direction along the limiting strip hole, so as to adapt to the engine test with different exhaust nozzle center positions; meanwhile, the moving distance of the adjusting upper cover plate and the adjusting lower cover plate is adjusted to change the distance between the adjusting upper cover plate and the adjusting lower cover plate, so as to adjust the cross-sectional area of the exhaust injection port, and adapt to the engine test with different cross-sectional size exhaust nozzles, so that the exhaust injection device can meet the exhaust requirements of the engine high-altitude simulation test in a certain range, improve the universality and utilization efficiency of the exhaust injection device, thereby reducing the use cost and shortening the modification cycle, and improving the test efficiency.

[0016] Other features and advantages of the present application will be set forth in the following description, and in part will become apparent to those skilled in the art from the description, or can be learned by practice of the present application. The objects and other advantages of the present application can be achieved and obtained by the structure indicated in the specification and drawings. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiment or prior art description. Obviously, the drawings in the following description are some embodiments of the present application, and those skilled in the art can also obtain other drawings according to these drawings without any creative labor.

[0018] Figure 1 A schematic diagram of the exhaust injection device with adjustable injection port section in the embodiment of the present application is shown; Figure 2 A front view of the use state of the exhaust injection device with adjustable injection port section in the embodiment of the present application is shown; Figure 3 A rear view of the use state of the exhaust injection device with adjustable injection port section in the embodiment of the present application is shown; Figure 4 A front view of the use state of the exhaust injection device with adjustable injection port section in the embodiment of the present application is shown; Figure 5 A rear view of the use state of the exhaust injection device with adjustable injection port section in the embodiment of the present application is shown; Figure 6 A front view of the use state of the exhaust injection device with adjustable injection port section in the embodiment of the present application is shown; Figure 7 A three-dimensional schematic view of the exhaust injection device with adjustable injection port cross section in the embodiment of the present application is shown.

[0019] In the figure, 1 is an adapter section; 2 is a first bolt; 3 is an adjusting section; 4 is a second bolt; 5 is an adjusting upper cover plate; 6 is an adjusting lower cover plate; 7 is a third bolt; and 8 is a sealing gasket plate. DETAILED DESCRIPTION

[0020] The following description provides many different embodiments, or examples, for implementing different features of the application. Specific examples are described in the following description to provide a thorough explanation of the application. These examples can be combined with each other, other implementations of the application can be used, and the description is not limited to the examples described.

[0021] To make the objects, technical solutions, and advantages of the embodiments of the present application clearer, the following will clearly and completely explain the technical solutions in the embodiments of the present application with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are some but not all of the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0022] The present application provides an exhaust injection device with adjustable injection port cross section, Figure 1 A schematic view of the exhaust injection device with adjustable injection port cross section in the embodiment of the present application is shown, referring to Figure 1 and Figure 7 The exhaust injection device with adjustable injection port cross section comprises an adapter section 1 and an adjusting section 3. One end of the adapter section 1 is connected to one end of the adjusting section 3, and the other end of the adapter section 1 is coaxially connected to a fourth flange. A plurality of first bolts 2 are arranged on the side wall of the fourth flange in an array around the circumference. The end of the adapter section 1 away from the adjusting section 3 is used to connect to the flange connection surface of the exhaust cylinder of the vehicle platform, and the connection is achieved through the first bolts 2. The inner cavity of the adapter section 1 is connected to the inner cavity of the adjusting section 3 to form a gas flow chamber. The other end of the adjusting section 3 is coaxially connected to a first flange. The side wall of the first flange is slidingly connected to an adjusting upper cover plate 5 and an adjusting lower cover plate 6. The sliding direction of the adjusting upper cover plate 5 and the adjusting lower cover plate 6 is a first direction, which meets the technical requirement of the adjusting upper cover plate 5 and the adjusting lower cover plate 6 moving closer to or farther away from each other. A plurality of limiting strip holes extending along the first direction are formed on the side wall of the adjusting upper cover plate 5 and the adjusting lower cover plate 6. A plurality of third bolts 7 are threadedly connected to the inner wall of the limiting strip holes and are sleeved with the first flange. The first direction is perpendicular to the axis of the adjusting section 3. A plurality of coaxially arranged notches are formed on the side wall of the adjusting upper cover plate 5 and the adjusting lower cover plate 6. The notch of the adjusting upper cover plate 5 is connected to the notch of the adjusting lower cover plate 6 to form an exhaust injection port corresponding to the gas flow chamber.

[0023] Reference Figure 7 The exhaust injection device with adjustable exhaust injection port section disclosed in the present application can be used in practice. One end of the adapter section 1 is connected to the flange connection surface of the vehicle platform exhaust cylinder, and the exhaust injection port is connected to the engine. By adjusting the upper adjusting cover plate 5 and the lower adjusting cover plate 6 to move in the first direction along the limiting strip hole, the position of the exhaust injection port formed by the gap between the upper adjusting cover plate 5 and the lower adjusting cover plate 6 is offset, and the movement distance of the upper adjusting cover plate 5 and the lower adjusting cover plate 6 is adjusted to accurately adjust the position of the center line of the exhaust injection port.

[0024] Meanwhile, the movement distance of the upper adjusting cover plate 5 and the lower adjusting cover plate 6 is adjusted to change the distance between the upper adjusting cover plate 5 and the lower adjusting cover plate 6, and then the size of the cross-sectional area of the exhaust injection port is adjusted.

[0025] In Figure 5 and Figure 6 In the example shown, when the upper adjusting cover plate 5 and the lower adjusting cover plate 6 move in the first direction along the limiting strip hole until the distance between the upper adjusting cover plate 5 and the lower adjusting cover plate 6 is at a minimum, the cross-sectional area of the exhaust injection port formed by the gap between the upper adjusting cover plate 5 and the lower adjusting cover plate 6 is at a minimum, the cross-section of the exhaust injection port is reduced to a cross-section composed of two symmetrical and smaller than half circular arcs, and the combined cross-section also moves in the first direction, thereby simultaneously achieving the functions of flexibly adjusting the center position of the exhaust injection port and the size of the cross-sectional area of the exhaust injection port within a certain range to adapt to engine tests of different cross-sectional size exhaust nozzles; at the same time, based on the flexible adjustment of the center position of the exhaust injection port within a certain range, the engine tests of different exhaust nozzle center positions are adapted. That is, the exhaust injection device disclosed in the present application meets the exhaust requirements of high-altitude simulation tests of engines of multiple types and installation states within a certain range, improves the universality and utilization efficiency of the exhaust injection device, thereby reducing the use cost and shortening the modification period, and improving the test efficiency.

[0026] It should be noted that the length of the adapter section 1 in the present application is adjusted according to the specific needs of the engine in the high-altitude simulation test. By adding the adapter section 1, when facing different length requirements, only different length adapter sections 1 need to be replaced and assembled with the adjusting section 3, which improves the use range of the exhaust injection device of the present application while reducing the use and production cost of the exhaust injection device of the present application.

[0027] Reference Figure 2The cross sections of the adjusting upper cover plate 5 and the adjusting lower cover plate 6 are both annular structures, upper notches are formed at both ends of the adjusting upper cover plate 5 to form upper protrusions, and lower notches are formed at both ends of the adjusting lower cover plate 6 to form lower protrusions; the upper notches and the upper protrusions correspond to the lower protrusions and the lower notches respectively to form plug connections.

[0028] During the movement of the adjusting upper cover plate 5 and the adjusting lower cover plate 6, the upper notches and the lower protrusions and the upper protrusions and the lower notches always have overlapping parts, thereby ensuring the sealing performance at the exhaust injection port.

[0029] In addition, the thickness of the upper protrusion is less than the thickness of the adjusting upper cover plate 5, and the side wall of the upper protrusion away from the adjusting section 3 is coplanar with the outer wall of the adjusting upper cover plate 5. The adjusting lower cover plate 6 is connected with receiving portions at both ends, the receiving portions are located at the lower notches, and one side wall of the receiving portion is fitted with the side wall of the upper protrusion, and the other side wall of the receiving portion is fitted with the side wall of the first flange, so that the receiving portion and the upper protrusion form an overlapping arrangement of upper and lower contact fittings, avoiding interference during the movement of the adjusting upper cover plate 5 and the adjusting lower cover plate 6, and further improving the sealing performance at the exhaust injection port and the sealing performance between the connecting surface of the adjusting upper cover plate 5 and the adjusting section 3.

[0030] Reference Figure 5 The sealing gasket plate 8 is further provided, the outer wall of each third bolt 7 is sleeved with the sealing gasket plate 8, and the end of each sealing gasket plate 8 corresponds to the port of each limiting strip hole to form a blockage. When the third bolt 7 is threadedly connected with the first flange, the third bolt 7 extrudes the sealing gasket plate 8 to block the limiting strip hole, and the internal environment of the limiting strip hole and the internal environment of the gas flow chamber are connected with the external environment.

[0031] In this embodiment, the sealing gasket plate 8 includes a strip-shaped portion and a semicircular portion connected to both ends of the strip-shaped portion, and both ends of the limiting strip hole adopt a semicircular structure. The center distance between the centers of the two semicircular portions is greater than the center distance between the centers of the semicircles at both ends of the limiting strip hole. For example, the center distance between the centers of the two semicircular portions is 1.5 times the center distance between the centers of the semicircles at both ends of the limiting strip hole, so as to ensure that the coverage area of the sealing gasket plate 8 is greater than the cross-sectional area of the limiting strip hole.

[0032] Correspondingly, the sealing gasket plate 8 is sleeved on the outer wall of the third bolt 7, and the center line of the third bolt 7 is located at a position 1 / 3 of the center distance between the centers of the two semicircular portions on the sealing gasket plate 8. On the basis of ensuring that the length of the sealing gasket plate 8 meets the blocking requirement of the corresponding limiting strip hole, the length of the sealing gasket plate 8 is limited to achieve the shortest length of the sealing gasket plate 8.

[0033] Reference Figure 6The adapter section 1 is coaxially connected with a second flange at one end of the adjusting section 3, the adjusting section 3 is coaxially connected with a third flange at one end of the adapter section 1, and the second flange is connected with the third flange and is fixedly connected through a plurality of second bolts 4.

[0034] In actual use, according to the installation angle requirement, the relative angle between the adapter section 1 and the exhaust cylinder of the vehicle platform is adjusted, so that the exhaust injection port deviating from the center of the adjusting section 3 rotates at the same installation angle relative to the center of the adapter section 1, thereby realizing the technical effect that the center position of the exhaust injection port is moved and adjusted in more different directions.

[0035] In addition, on the basis of the second flange and the third flange, during the assembly of the adapter section 1 and the adjusting section 3, the relative angle between the adapter section 1 and the adjusting section 3 can be further adjusted, thereby further increasing the diversity of the direction of the center position of the exhaust injection port.

[0036] Reference Figure 7 The second bolts 4 are arranged in a circular array about the axis of the third flange, and the number of the second bolts 4 is 12, that is, the central angle between adjacent second bolts 4 is 30°, which corresponds to the requirement of adjusting the relative angle between the adapter section 1 and the adjusting section 3. The number of the second bolts 4 can also be other numbers greater than 12, which are symmetrically and uniformly distributed, so that the adapter section 1 and the adjusting section 3 have more relative installation angles, thereby enabling the center position of the exhaust injection port to have more directional movement and adjustment.

[0037] Reference Figure 3 The gaps of the adjusting upper cover plate 5 and the adjusting lower cover plate 6 are semicircular structures, and when the distance between the adjusting upper cover plate 5 and the adjusting lower cover plate 6 is at a maximum, the exhaust injection port is a circular structure, which corresponds to the test requirement of the largest specification engine, so that when the distance between the adjusting upper cover plate 5 and the adjusting lower cover plate 6 is reduced, the cross section of the exhaust injection port meets the test requirement of the remaining specification engine.

[0038] Reference Figure 5 The limiting strip holes of the adjusting upper cover plate 5 are arranged in a circular array about the axis of the gap of the adjusting upper cover plate 5, and the limiting strip holes of the adjusting lower cover plate 6 are arranged in a circular array about the axis of the gap of the adjusting lower cover plate 6, so as to realize the overall fixation of the adjusting upper cover plate 5, the adjusting lower cover plate 6 and the first flange, and improve the connection stability of the adjusting upper cover plate 5, the adjusting lower cover plate 6 and the adjusting section 3. For example, 6 limiting strip holes are provided in the side wall of the adjusting upper cover plate 5, and 6 limiting strip holes are provided in the side wall of the adjusting lower cover plate 6, and a total of 12 limiting strip holes are provided. The number of the limiting strip holes can also be other even numbers greater than 12, which are symmetrically and uniformly distributed.

[0039] The working principle of the present application is: When the adjusting upper cover plate 5 and the adjusting lower cover plate 6 are simultaneously moved by the same distance along the first direction relative to the adjusting section 3 based on the limiting strip hole, the exhaust injection port composed of the notches of the adjusting upper cover plate 5 and the adjusting lower cover plate 6 will be moved by the same distance along the first direction based on the limiting strip hole, so that the movement adjustment of the center position of the exhaust injection port along the first direction is realized. Figure 6 In the example shown, a third state schematic view in which the caliber of the exhaust injection port is at the minimum is shown. Figure 4 In the example shown, a second state schematic view in which the caliber of the exhaust injection port is at the intermediate transition is shown. Figure 3 In the example shown, a first state schematic view in which the caliber of the exhaust injection port is at the maximum is shown.

[0040] By changing the relative installation angle of the connecting flange face between the adjusting section 1 and the adjusting section 3, the exhaust injection port deviating from the center position of the adjusting section 3 can be rotated by the same installation angle relative to the center of the adjusting section 1, so that the movement adjustment of the center position of the exhaust injection port along more different directions is realized.

[0041] When the adjusting upper cover plate 5 and the adjusting lower cover plate 6 are moved by the same distance inward relative to the center of the adjusting section 3 along the first direction based on the limiting strip hole, the exhaust injection port composed of the notches of the adjusting upper cover plate 5 and the adjusting lower cover plate 6 will be reduced to a cross section composed of two symmetrical and smaller than semicircular arcs, so that the adjustment of the size of the cross section area of the exhaust injection port in a certain range is realized. When the adjusting upper cover plate 5 and the adjusting lower cover plate 6 are moved by the same distance inward relative to the center of the adjusting section 3 along the first direction based on the limiting strip hole, and then are simultaneously moved by the same distance along the first direction relative to the adjusting section 3 based on the limiting strip hole, the exhaust injection port composed of the notches of the adjusting upper cover plate 5 and the adjusting lower cover plate 6 will be reduced to a cross section composed of two symmetrical and smaller than semicircular arcs, and the combined cross section will be moved by the same distance along the first direction, so that the flexible adjustment of the center position of the exhaust injection port and the size of the cross section area of the exhaust injection port in a certain range is realized.

[0042] In addition, the exhaust injection device with adjustable cross section of the present application can also be used for the whole machine test bed for developing non-high altitude simulation test.

[0043] In the description of the present application, the terms "first", "second" are only used for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "a plurality of" is two or more, unless otherwise specifically limited.

[0044] It should be noted that unless specifically defined otherwise, all terms used in the description and claims are to be interpreted in accordance with their ordinary meaning. The terms "comprising", "comprises" and "comprised of" as used herein are to be construed as meaning "including, but not limited to".

[0045] It should be understood that all the terms used to indicate the position or positional relationship are based on the position or positional relationship shown in the drawings, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific position, be constructed and operated in a specific position, and cannot be understood as a limitation on the present application.

[0046] Although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that the technical solutions recorded in the foregoing embodiments can still be modified, or some technical features can be replaced by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. An exhaust ejector device with an adjustable ejector port cross-section, used for connecting the flange connection surface of the exhaust pipe of a docking platform, characterized in that, include: Transition section (1) and adjustment section (3); One end of the transition section (1) is connected to one end of the adjustment section (3). The inner cavity of the transition section (1) is connected to the inner cavity of the adjustment section (3) to form a gas flow chamber. The other end of the adjustment section (3) is coaxially connected to the first flange. The side wall of the first flange is slidably connected to the upper adjustment cover plate (5) and the lower adjustment cover plate (6). The sliding direction of the upper adjustment cover plate (5) and the lower adjustment cover plate (6) is the first direction. The side walls of the upper adjustment cover plate (5) and the lower adjustment cover plate (6) are provided with a plurality of limiting strip holes extending along the first direction. The inner walls of the plurality of limiting strip holes are all fitted with third bolts (7) that are threadedly connected to the flange. Both the upper and lower adjustment cover plates (5) have coaxially arranged notches on their side walls. The notch of the upper adjustment cover plate (5) is connected to the notch of the lower adjustment cover plate (6) to form an exhaust ejector corresponding to the gas flow chamber.

2. The adjustable exhaust ejector device with an adjustable ejector port cross-section according to claim 1, characterized in that, The cross-sections of the upper adjustment cover plate (5) and the lower adjustment cover plate (6) are both annular. The upper adjustment cover plate (5) has upper slots at both ends to form upper protrusions, and the lower adjustment cover plate (6) has lower slots at both ends to form lower protrusions. The upper groove and the upper protrusion are respectively connected to the lower protrusion and the lower groove to form an insertion connection.

3. The adjustable exhaust ejector device with an adjustable ejector port cross-section according to claim 2, characterized in that, The thickness of the upper protrusion is less than the thickness of the upper cover plate (5), and the side wall of the upper protrusion facing away from the adjustment section (3) is coplanar with the outer wall of the upper cover plate (5). Both ends of the adjusting lower cover plate (6) are connected to the receiving part. The receiving part is located at the lower groove and one side wall of the receiving part is in contact with the side wall of the upper protrusion. The other side wall of the receiving part is in contact with the side wall of the first flange.

4. The exhaust ejector device with adjustable ejector port cross-section according to claim 1, characterized in that, It also includes sealing gaskets (8), and the outer walls of several third bolts (7) are fitted with sealing gaskets (8), and the several sealing gaskets (8) correspond one to one to form a seal at the port of several limiting strip holes.

5. The exhaust ejector device with adjustable ejector port cross-section according to claim 4, characterized in that, The sealing gasket (8) includes a strip-shaped part and a semi-circular part connecting the two ends of the strip-shaped part. The two ends of the limiting strip hole adopt a semi-circular structure, and the center distance between the centers of the two semi-circular parts is greater than the center distance between the centers of the semi-circles at both ends of the limiting strip hole.

6. The exhaust ejector device with adjustable ejector port cross-section according to claim 1, characterized in that, The transition section (1) is coaxially connected to the second flange at one end facing the adjustment section (3), and the adjustment section (3) is coaxially connected to the third flange at one end facing the transition section (1). The second flange and the third flange are mated and fixedly connected by several second bolts (4).

7. The adjustable exhaust ejector device according to claim 6, characterized in that, The second bolts (4) are arranged in a circular array about the axis of the third flange.

8. The exhaust ejector device with adjustable ejector port cross-section according to claim 6, characterized in that, The transition section (1) is coaxially connected to the fourth flange at one end of the adjustment section (3), and the fourth flange has a number of first bolts (2) arranged in a circumferential array on the side wall of the fourth flange.

9. The exhaust ejector device with adjustable ejector port cross-section according to claim 1, characterized in that, The notches of the upper adjustment cover plate (5) and the lower adjustment cover plate (6) are both semi-circular, and the exhaust ejector is circular when the distance between the upper adjustment cover plate (5) and the lower adjustment cover plate (6) is at its maximum value.

10. The exhaust ejector device with adjustable ejector port cross-section according to claim 9, characterized in that, The limiting holes on the upper adjustment cover plate (5) are arranged in a circular array about the axis of the notch of the upper adjustment cover plate (5), and the limiting holes on the lower adjustment cover plate (6) are arranged in a circular array about the axis of the notch of the lower adjustment cover plate (6).

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