Ignition electric nozzle of aero-engine and assembly method

Abstract

The invention discloses an ignition electric nozzle of an aero-engine and an assembling method, and the ignition electric nozzle comprises a shell assembly which is of a right-angle structure; the central electrode, the conducting rod and the contact pin are arranged in the shell assembly, the central electrode is connected with the contact pin through the conducting rod, and the central electrode and the contact pin are arranged on a horizontal section and a vertical section in the shell assembly respectively, so that the central electrode and the contact pin are arranged vertically. The ignition electric nozzle is designed to be of a right-angle structure, the central electrode and the contact pin are perpendicular to each other, and therefore when the ignition cable is connected with the ignition electric nozzle, the situation that the ignition cable is bent at the connecting position of the ignition cable and the ignition electric nozzle is avoided; the problem that connection failure is prone to occurring between the ignition cable and the ignition electric nozzle in a linear type ignition electric nozzle is solved, and reliability and stability of connection between the ignition electric nozzle and the ignition cable are improved.

Description

Technical Field

[0001] The invention belongs to the technical field of ignition nozzles, and in particular relates to an aircraft engine ignition nozzle and an assembly method thereof. Background Art

[0002] The ignition nozzle is one of the key components in the aircraft engine ignition system. Its function is to convert the high-voltage electrical energy pulse generated by the ignition device into an electric spark to ignite the combustible oil and gas mixture in the engine combustion chamber. At present, the ignition nozzle of aircraft engines usually adopts a linear structure.

[0003] The linear structure of the ignition nozzle is connected to the ignition cable in a manner that causes bending at the connection with the ignition cable, which can easily lead to connection failure between the center conductor of the ignition cable and the ignition nozzle, affecting the reliability and performance of the aircraft engine ignition system. Summary of the invention

[0004] The object of the present invention is to provide an aircraft engine ignition nozzle and an assembly method to solve the problems existing in the existing linear ignition nozzles.

[0005] The present invention is achieved through the following technical solutions: Aircraft engine ignition nozzle, including: A housing assembly, wherein the housing assembly is a right-angle structure; A central electrode, a conductive rod and a contact pin are arranged in the shell component. The central electrode is connected to the contact pin through the conductive rod. The central electrode and the contact pin are arranged in the horizontal section and the vertical section of the shell component respectively, so that the central electrode and the contact pin are arranged perpendicular to each other.

[0006] In some embodiments, a sealed porcelain tube is disposed in the housing assembly; The sealed porcelain tube is a right-angle structure, and is provided with a horizontal mounting hole matched with the conductive rod and a vertical mounting hole matched with the contact pin; The conductive rod and the contact pin are respectively arranged in the horizontal mounting hole and the vertical mounting hole of the sealed porcelain tube. The horizontal mounting hole and the vertical mounting hole are connected at one end, so that the conductive rod and the contact pin can be connected and arranged perpendicularly to each other.

[0007] In some embodiments, a threaded hole is disposed at one end of the contact pin, and one end of the conductive rod is disposed in the threaded hole and is threadedly connected to the contact pin.

[0008] In some embodiments, the conductive rod and the contact pin are provided with sealing flanges, and the sealing porcelain tube is provided with a sealing end face that matches the sealing flange.

[0009] In some embodiments, the housing assembly includes a mounting frame housing, a horizontal segment housing, a vertical segment housing, and a connecting housing connected in sequence at one end; The horizontal section housing is arranged at the horizontal section of the sealing porcelain tube, and a second sealing bushing is arranged between the sealing porcelain tube and the horizontal section housing at one end where the horizontal section housing is connected to the mounting frame housing; The vertical section shell is arranged in the vertical section of the sealing porcelain tube, and a third sealing bushing is arranged between the sealing porcelain tube and the vertical section shell at one end where the vertical section shell is connected to the connecting shell.

[0010] In some embodiments, one end of the horizontal section shell and the vertical section shell are respectively configured as sloped surfaces, and the shell assembly is formed into a right-angle structure through welding connection between the sloped surfaces.

[0011] In some embodiments, the housing assembly further includes a firing end housing connected at one end to the mounting bracket housing; An insulating porcelain tube is arranged in the ignition end shell, the central electrode is arranged in the insulating porcelain tube, and a first sealing bushing is arranged between the insulating porcelain tube and the ignition end shell at one end where the ignition end shell is connected to the mounting frame shell.

[0012] In some embodiments, the central electrode and the conductive rod are connected via a connecting rod.

[0013] In some embodiments, a mounting seat is disposed on the mounting frame shell, and a mounting hole is disposed on the mounting seat.

[0014] On the other hand, the present invention also provides a method for assembling an aircraft engine ignition nozzle, comprising the following steps: The insulating porcelain tube and the first sealing bushing are assembled into the ignition end housing, so that a ceramic-metal seal is formed between the insulating porcelain tube and the first sealing bushing to form a first sealing unit; Installing the first sealing unit into the ignition end housing, and welding the first sealing unit and the ignition end housing along the circumference; Connect the housing of the mounting frame with the housing of the ignition end, and weld the housing of the mounting frame and the housing of the ignition end along the circumference to form a housing unit; Install the contact into the vertical installation hole of the sealed porcelain tube, install the conductive rod into the horizontal installation hole and connect it with the threaded hole on the contact through threads; A second sealing bushing is installed at the end of the horizontal section of the sealing porcelain tube, and a third sealing bushing is installed at the end of the vertical section of the sealing porcelain tube; The horizontal section shell and the vertical section shell are respectively installed on the horizontal section and the vertical section of the sealed porcelain tube, and the two are butt-welded; The horizontal section housing and the second sealing bushing, the vertical section housing and the third sealing bushing are welded along the circumference to form a second sealing unit; Install the connecting shell to the end of the vertical section shell and weld it along the circumference; Assemble and weld the center electrode and the connecting rod to form a center electrode unit; Install the other end of the connecting rod onto the conductive rod and weld it; The central electrode unit is inserted into the housing unit for installation, and the housing of the mounting frame and the housing of the horizontal section are connected, and the housing of the mounting frame and the housing of the horizontal section are welded along the circumference.

[0015] Compared with the prior art, the present invention has the following advantages and beneficial effects: In the present invention, the ignition nozzle is designed to be a right-angle structure so that the center electrode and the contact pin are arranged perpendicular to each other. In this way, when the ignition cable is connected to the ignition nozzle, the ignition cable will not be bent at the connection with the ignition nozzle, thereby solving the problem of connection failure between the ignition cable and the ignition nozzle in a linear ignition nozzle and improving the reliability and stability of the connection between the ignition nozzle and the ignition cable.

[0016] The present invention is based on the structural setting of the contact pin in the ignition nozzle and the connection structure between the ignition cable and the ignition nozzle. The ignition cable will not generate radial shear stress on the contact pin during the plugging and unplugging process of the ignition nozzle, and the problem of the contact pin being broken due to stress caused by bending and pulling of the ignition cable will not occur, thereby improving the reliability of the connection between the ignition cable and the ignition nozzle.

[0017] The present invention designs the various components of the ignition nozzle, and in the case of realizing a right-angle structure of the ignition nozzle, cooperates with the adopted assembly method to well realize the internal and external sealing between the various components of the ignition nozzle, so that the ignition nozzle of this right-angle structure can have good sealing performance, and avoids the problem of the ignition cable fusing caused by the ignition nozzle leaking due to sealing failure. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0019] Figure 1 The figure is a schematic diagram of the structure of an aircraft engine ignition nozzle according to an embodiment of the present invention.

[0020] Figure 2 It is a left side view of the aircraft engine ignition nozzle structure according to an embodiment of the present invention.

[0021] Figure 3It is a right side view of the aircraft engine ignition nozzle structure according to an embodiment of the present invention.

[0022] Figure 4 The figure is a schematic diagram of the internal and external sealing matching structure of an aircraft engine ignition nozzle according to an embodiment of the present invention.

[0023] Figure 5 The present invention is a schematic diagram of the docking structure of the horizontal section housing and the vertical section housing of an aircraft engine ignition nozzle in an embodiment of the present invention.

[0024] Figure 6 It is a schematic cross-sectional view of the docking structure of the horizontal section housing and the vertical section housing of an aircraft engine ignition nozzle according to an embodiment of the present invention.

[0025] Figure 7 The present invention is a schematic diagram of the connection structure between the conductive rod and the contact in the aircraft engine ignition nozzle according to an embodiment of the present invention.

[0026] Figure 8 The figure is a schematic diagram of the structure of a sealed porcelain tube in an aero-engine ignition nozzle according to an embodiment of the present invention.

[0027] Fig. 9 It is a schematic cross-sectional view of the sealed porcelain tube structure in an aircraft engine ignition nozzle according to an embodiment of the present invention.

[0028] in: 11. center electrode, 12. connecting rod, 13. conductive rod, 14. contact pin, 141. threaded hole, 15. sealing flange; 21. Insulating porcelain tube, 22. Sealing porcelain tube, 221. Horizontal mounting hole, 222. Vertical mounting hole, 223. Sealing end face 31. Ignition end housing, 32. Mounting frame housing, 321. Mounting seat, 322. Mounting hole, 33. Horizontal section housing, 34. Vertical section housing, 35. Connecting housing, 36. Slope surface, 37. External sealing fit; 41. A first sealing bushing, 42. A second sealing bushing, 43. A third sealing bushing. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings 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.

[0030] In view of the problems existing in the linear ignition nozzle, the present invention proposes an aircraft engine ignition nozzle with a right-angle structure. In some embodiments of the present invention, referring to Figure 1 , Figure 2 , Figure 3 and Figure 4, aircraft engine ignition nozzles include: Shell assembly, the shell assembly is a right-angle structure; And a central electrode 11, a conductive rod 13 and a contact pin 14 are arranged in the shell component, wherein the central electrode 11 is connected to the contact pin 14 through the conductive rod 13, wherein the central electrode and the contact pin are respectively arranged in the horizontal section and the vertical section of the shell component, so that the central electrode 11 and the contact pin 14 are arranged perpendicular to each other.

[0031] Here, the ignition nozzle is designed to be a right-angle structure so that the center electrode and the contact pin are arranged perpendicular to each other. In this way, when the ignition cable is connected to the ignition nozzle, there will be no bending of the ignition cable at the connection with the ignition nozzle, thereby solving the problem of connection failure between the ignition cable and the ignition nozzle in a linear ignition nozzle and improving the reliability and stability of the connection between the ignition nozzle and the ignition cable.

[0032] Based on the structural setting of the contact pin in the ignition nozzle and the connection structure between the ignition cable, the ignition cable will not generate radial shear stress on the contact pin during the plugging and unplugging of the ignition nozzle, and the problem of the contact pin being broken due to the bending and pulling of the ignition cable will not occur, thereby improving the reliability of the connection between the ignition cable and the ignition nozzle.

[0033] In some embodiments, reference Figure 7 , Figure 8 and Fig. 9 A sealed porcelain tube 22 is provided in the shell assembly, and the sealed porcelain tube 22 is used to set the conductive rod and the contact pin, and is used to maintain insulation between the conductive rod, the contact pin and the shell assembly. The sealed porcelain tube is arranged in a right-angle structure, and a horizontal mounting hole 221 matching the conductive rod and a vertical mounting hole 222 matching the contact pin are arranged in the sealed porcelain tube 22. The conductive rod 13 is mounted in the horizontal mounting hole 221, and the contact pin 14 is mounted in the vertical mounting hole 222.

[0034] The horizontal mounting hole 221 is connected to the vertical mounting hole 222 at one end, so that the conductive rod and the contact pin can be connected at one end and arranged perpendicularly to each other after being installed on the sealing porcelain tube.

[0035] In some embodiments, a threaded hole 141 is provided at one end of the stylus 14. When installing, the stylus is placed in the vertical mounting hole. When the conductive rod is installed in the horizontal mounting hole, one end of the conductive rod is placed in the threaded hole and is threadedly connected with the stylus. The connection between the center electrode and the stylus is achieved through the conductive rod, and the vertical setting between the center electrode and the stylus is achieved by setting the conductive rod and the stylus in a right-angle connection structure. The center electrode and the stylus are connected by threads, which facilitates the connection between the center electrode and the stylus in the sealed porcelain tube, and makes the connection between the center electrode and the stylus stable and reliable.

[0036] In some embodiments, a sealing flange 15 is provided on the conductive rod 13 and the contact pin 14, and a sealing end face 223 matching the sealing flange is provided on the sealing porcelain tube. Figure 4 , Figure 7 , Figure 8 and 9 When the conductive rod and the contact pin are installed on the sealing porcelain tube, a ceramic-metal sealing fit can be formed between the sealing flange and the sealing end face, thereby ensuring good sealing performance between the conductive rod, the contact pin and the sealing ceramic.

[0037] At the same time, the threaded connection structure between the conductive rod and the contact pin enables the sealing flange and the sealing end face to better form a tight fit, thereby ensuring the sealing performance of the ignition nozzle.

[0038] In some embodiments, the housing assembly includes a mounting frame housing 32, a horizontal segment housing 33, a vertical segment housing 34, and a connection housing 35 which are sequentially connected at one end.

[0039] Among them, the horizontal section shell 33 is arranged in cooperation with the horizontal section of the sealing porcelain tube 22, and a second sealing bushing 42 is arranged between the sealing porcelain tube 22 and the horizontal section shell 33 at one end where the horizontal section shell and the mounting frame shell are connected. The second sealing bushing forms a good seal for the sealing porcelain tube at the position where it cooperates with the horizontal section shell and the mounting frame shell.

[0040] The vertical section shell 34 is arranged in cooperation with the vertical section of the sealing porcelain tube 22. A third sealing bushing 43 is arranged between the sealing porcelain tube 22 and the vertical section shell 34 at one end where the vertical section shell is connected to the connecting shell. The third sealing bushing forms a good seal on the sealing porcelain tube at the position where it cooperates with the vertical section shell and the connecting shell.

[0041] Reference Figure 1 The horizontal section shell is connected to the mounting frame shell by threads at the end, and then fusion welding is performed along the circumference of the connection position; the vertical section shell is connected to the connecting shell by threads at the end, and then fusion welding is performed along the circumference of the connection position; the horizontal section shell and the vertical section shell are welded at the butt end to ensure the external sealing performance of the shell assembly.

[0042] In some embodiments, Figure 5 and Figure 6 One end of the horizontal section shell 33 and the vertical section shell 34 are respectively set to a slope surface 36, and the horizontal section shell and the vertical section shell are welded and connected at the butt position by butt welding through the slope surface, so that the shell assembly has a right-angle structure and facilitates the welding connection between the horizontal section shell and the vertical section shell.

[0043] In some embodiments, the housing assembly further includes a firing end housing 31 connected to a mounting bracket housing 32 at one end.

[0044] An insulating porcelain tube 21 is arranged in the ignition end housing 31, and the center electrode 11 is arranged in the insulating porcelain tube 21. A first sealing bushing 41 is arranged between the insulating porcelain tube 21 and the ignition end housing 31 at one end where the ignition end housing is connected to the mounting frame housing. Through the matching arrangement of the ignition end housing and the insulating porcelain tube, the center electrode is sealed in the shell assembly, and the first sealing bushing is arranged to form a good seal on the insulating porcelain tube at the position where it is matched with the mounting frame housing and the ignition end housing, thereby ensuring good sealing performance at this position.

[0045] At this time, if Figure 4 As shown, external sealing fit 37 is formed between the ignition end housing 31 and the mounting frame housing 32 , between the mounting frame housing 32 and the horizontal section housing 33 , and between the vertical section housing 34 and the connecting housing 35 in the housing assembly.

[0046] In some embodiments, a connecting rod 12 is provided between the center electrode 11 and the conductive rod 13 for transition connection, and the center electrode, the conductive rod and the connecting rod are connected by circumferential welding at the connection position after the ends are threadedly connected.

[0047] When installing the ignition nozzle, it is usually connected directly to the mounting base of the engine combustion chamber casing through threads. Due to the high temperature and vibration stress environment of the engine combustion chamber, the threaded connection of the ignition nozzle can easily fail and lock, making it difficult to remove the ignition nozzle from the engine.

[0048] In some embodiments, a mounting seat 321 is disposed on the mounting frame housing 32 , and three mounting holes 322 are disposed on the mounting seat 321 .

[0049] A mounting seat is arranged on the mounting bracket, and the mounting seat is connected to the engine through a fixing hole on the mounting seat during installation, which effectively solves the problem of difficulty in removing the ignition nozzle from the engine due to failure and locking of the ignition nozzle threaded connection.

[0050] Compared with the linear ignition nozzle, the aircraft engine ignition nozzle with the above-mentioned right-angle structure has a more complex structure, which brings great difficulty to the assembly and processing of this ignition nozzle. During the assembly process, it is necessary to consider the interference that may be caused by the assembly sequence between the components, and the internal and external sealing problems after the components are assembled.

[0051] The present invention provides an assembly method for the ignition nozzle of the right-angle structure. In some embodiments, the assembly method of the ignition nozzle of the aircraft engine includes the following steps: The insulating porcelain tube and the first sealing bushing are assembled into the ignition end housing, so that a ceramic-metal seal is formed between the insulating porcelain tube and the first sealing bushing to form a first sealing unit; Installing the first sealing unit into the ignition end housing, and performing fusion welding on the first sealing unit and the ignition end housing along the circumference; The housing of the mounting frame is connected to the housing of the ignition end by threads, and the housing of the mounting frame and the housing of the ignition end are fusion welded along the circumference to form a housing unit; Install the contact into the vertical installation hole of the sealed porcelain tube, install the conductive rod into the horizontal installation hole and connect it with the threaded hole on the contact through threads; A second sealing bushing is installed at the end of the horizontal section of the sealing porcelain tube, and a third sealing bushing is installed at the end of the vertical section of the sealing porcelain tube; The horizontal section shell and the vertical section shell are respectively installed on the horizontal section and the vertical section of the sealed porcelain tube, and the two are butt-welded; The horizontal section housing and the second sealing bushing, the vertical section housing and the third sealing bushing are welded along the circumference to form a second sealing unit; Install the connecting shell to the end of the vertical section shell, thread the connecting shell and the vertical section shell together and weld them along the circumference; Assemble and weld the center electrode and the connecting rod to form a center electrode unit; Install the other end of the connecting rod onto the conductive rod and weld it; The central electrode unit is inserted into the housing unit and connected with the mounting frame housing and the horizontal section housing, and the mounting frame housing and the horizontal section housing are welded along the circumference to obtain an ignition nozzle with a right-angle structure.

[0052] In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. used to indicate the orientation or position relationship are based on the orientation or position relationship shown in the accompanying drawings, or are the orientation or position relationship commonly placed when the product of the invention is used. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0053] In addition, if the terms "horizontal" or "vertical" appear in the description of the present invention, it does not mean that the components are required to be absolutely horizontal or suspended, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0054] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood in combination with specific circumstances.

[0055] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Any simple modification or equivalent change made to the above embodiment based on the technical essence of the present invention shall fall within the protection scope of the present invention.

Claims

1. An aircraft engine ignition nozzle, characterized in that: include: A housing assembly, wherein the housing assembly is a right-angle structure; A central electrode, a conductive rod and a contact pin are arranged in the shell component. The central electrode is connected to the contact pin through the conductive rod. The central electrode and the contact pin are arranged in the horizontal section and the vertical section of the shell component respectively, so that the central electrode and the contact pin are arranged perpendicular to each other.

2. The aircraft engine ignition nozzle according to claim 1, characterized in that: A sealed porcelain tube is arranged in the housing assembly; The sealed porcelain tube is a right-angle structure, and is provided with a horizontal mounting hole matched with the conductive rod and a vertical mounting hole matched with the contact pin; The conductive rod and the contact pin are respectively arranged in the horizontal mounting hole and the vertical mounting hole of the sealed porcelain tube. The horizontal mounting hole and the vertical mounting hole are connected at one end, so that the conductive rod and the contact pin can be connected and arranged perpendicularly to each other.

3. The aircraft engine ignition nozzle according to claim 2, characterized in that: A threaded hole is arranged at one end of the contact pin, and one end of the conductive rod is arranged in the threaded hole and is threadedly connected with the contact pin.

4. The aircraft engine ignition nozzle according to claim 3, characterized in that: The conductive rod and the contact pin are provided with sealing flanges, and the sealing porcelain tube is provided with a sealing end face matched with the sealing flange.

5. The aircraft engine ignition nozzle according to claim 2, characterized in that: The housing assembly includes a mounting frame housing, a horizontal section housing, a vertical section housing and a connecting housing which are sequentially connected at one end; The horizontal section housing is arranged at the horizontal section of the sealing porcelain tube, and a second sealing bushing is arranged between the sealing porcelain tube and the horizontal section housing at one end where the horizontal section housing is connected to the mounting frame housing; The vertical section shell is arranged in the vertical section of the sealing porcelain tube, and a third sealing bushing is arranged between the sealing porcelain tube and the vertical section shell at one end where the vertical section shell is connected to the connecting shell.

6. The aircraft engine ignition nozzle according to claim 5, characterized in that: One end of the horizontal section shell and the vertical section shell are respectively arranged as slope surfaces, and the shell assembly is formed into a right-angle structure through welding connection between the slope surfaces.

7. The aircraft engine ignition nozzle according to claim 5, characterized in that: The housing assembly also includes a firing end housing connected at one end to the mounting frame housing; An insulating porcelain tube is arranged in the ignition end shell, the central electrode is arranged in the insulating porcelain tube, and a first sealing bushing is arranged between the insulating porcelain tube and the ignition end shell at one end where the ignition end shell is connected to the mounting frame shell.

8. The aircraft engine ignition nozzle according to claim 7, characterized in that: The central electrode and the conductive rod are connected via a connecting rod.

9. The aircraft engine ignition nozzle according to claim 5, characterized in that: A mounting seat is arranged on the mounting frame shell, and a mounting hole is arranged on the mounting seat.

10. The method for assembling an aircraft engine ignition nozzle according to any one of claims 7 to 9, characterized in that: The following steps are involved: The insulating porcelain tube and the first sealing bushing are assembled into the ignition end housing, so that a ceramic-metal seal is formed between the insulating porcelain tube and the first sealing bushing to form a first sealing unit; Installing the first sealing unit into the ignition end housing, and welding the first sealing unit and the ignition end housing along the circumference; Connect the housing of the mounting frame with the housing of the ignition end, and weld the housing of the mounting frame and the housing of the ignition end along the circumference to form a housing unit; Install the contact into the vertical installation hole of the sealed porcelain tube, install the conductive rod into the horizontal installation hole and connect it with the threaded hole on the contact through threads; A second sealing bushing is installed at the end of the horizontal section of the sealing porcelain tube, and a third sealing bushing is installed at the end of the vertical section of the sealing porcelain tube; The horizontal section shell and the vertical section shell are respectively installed on the horizontal section and the vertical section of the sealed porcelain tube, and the two are butt-welded; The horizontal section housing and the second sealing bushing, the vertical section housing and the third sealing bushing are welded along the circumference to form a second sealing unit; Install the connecting shell to the end of the vertical section shell and weld it along the circumference; Assemble and weld the center electrode and the connecting rod to form a center electrode unit; Install the other end of the connecting rod onto the conductive rod and weld it; The central electrode unit is inserted into the housing unit for installation, and the housing of the mounting frame and the housing of the horizontal section are connected, and the housing of the mounting frame and the housing of the horizontal section are welded along the circumference.

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