Hole exploration plug structure

Abstract

The borescope plug structure installed on the hole opening of the shell comprises a borescope seat, a plug, a locking block and a spring, the borescope seat is arranged in the hole opening and comprises an axial hole, a protruding ring body, a flanging and a clamping groove, and the flanging and the clamping groove are arranged on the protruding ring body; the plug comprises a column body and a cover body, the cover body comprises a buckle and a locking groove, the buckle is used for being clamped with the turned-over edge, and the column body penetrates through the axial hole; the locking block is arranged on the periphery of the column in a sleeving mode and comprises a pressing plate extending in the radial direction, and the pressing plate is contained in the locking groove and the clamping groove. The spring is sleeved on the periphery of the cylinder, and two ends of the spring abut against the locking block and the borescope seat respectively. The borescope plug structure is convenient to mount and dismount, and has better sealing performance.

Description

Technical Field

[0001] The invention relates to the field of aero-engine testing, and in particular to the field of orifice plugs. Background Art

[0002] In aircraft engines, compressed air from the compressor enters the combustion chamber and mixes with the gas ejected from the fuel nozzle. After combustion, it produces high-temperature gas, which drives the turbine to work and generate thrust. All major core components need to be easily inspected during the service of the engine line, so as to promptly discover internal engine problems and avoid major failures. Borescope holes are generally set up to conduct borescope inspections on key parts. For example, in the combustion chamber, the fuel nozzle and flame tube are in a very harsh environment, so online inspections are often required. In order to avoid disassembly, borescope holes are usually arranged on the combustion chamber casing, and a borescope is used to extend the borescope for inspection.

[0003] During inspection, the borescope hole needs to be blocked to avoid affecting engine performance and safety. Effective blocking and easy disassembly are the main functions of the borescope plug structure. When the aircraft is working normally, the borescope hole needs to be blocked. To facilitate disassembly and assembly, the borescope plug is required to be easy to disassemble and replace, and the loosening function should not be realized; the commonly used locking wire, self-locking and other structures as borescope plugs are often more complicated and have a short lifespan, which is not convenient for long-term online borescope execution.

[0004] At present, boresight plugs for various types of engines often use axial spring corrugated teeth meshing to prevent loosening. In order to achieve assembly of multiple axial parts, some parts need to be welded; and this type of boresight plug has a boss structure but no sealing structure, which is prone to leakage problems. For example, if the high-temperature combustion gas in the combustion chamber cannot be well sealed, leakage will affect the temperature of the core cabin and even cause a fire, affecting flight safety. In addition, this type of boresight plug is often complex in structure, heavy in weight, and difficult to operate. During the installation process, repeated friction of the corrugated teeth can easily cause wear of parts and affect the life of the plug or even the normal function of the plug, affecting aircraft safety. In addition, boresight plugs with corrugated tooth structures often have installation tightness differences due to torque differences, which is not conducive to precise installation and positioning. Summary of the invention

[0005] An object of the present invention is to provide a bore probe plug structure that is easy to install and disassemble.

[0006] A borehole probe plug structure is provided to achieve the above-mentioned purpose. The structure includes a borehole probe seat, a plug, a locking block and a spring. The borehole probe seat is arranged in the orifice, and includes an axial hole, a raised ring body, a flange and a slot, and the flange and the slot are arranged on the raised ring body; the plug includes a column and a cover body, and the cover body includes a buckle and a locking groove, and the buckle is used to engage with the flange, and the column passes through the axial hole; the locking block is sleeved on the outer periphery of the column, and includes a radially extending pressure plate, and the pressure plate is accommodated in the locking groove and the slot; the spring is sleeved on the outer periphery of the column, and its two ends are respectively against the locking block and the borehole probe seat.

[0007] In one or more embodiments, the column includes a first column, a second column and a sealing end surface located at the connection between the first column and the second column. The structure also includes a sealing ring arranged between the sealing end surface and the bore probe seat.

[0008] In one or more embodiments, the hole probe seat further comprises an annular convex edge arranged at the end of the axial hole for the spring and the sealing ring to abut against.

[0009] In one or more embodiments, the sealing ring is a W-shaped sealing ring or a C-shaped sealing ring.

[0010] In one or more embodiments, the pressure plate includes a step structure for engaging with the locking groove.

[0011] In one or more embodiments, the locking block further comprises a cylindrical section, and the spring is disposed within the cylindrical section.

[0012] In one or more embodiments, the plug is configured to be rotatable and axially movable within the axial hole.

[0013] The above-mentioned borehole probe plug structure realizes push-type rotating installation and disassembly by setting a spring buckle structure. It has a simple structure and is easy to operate. It can ensure the fastening between the plug and the borehole probe seat through the engagement of the flange and the buckle to avoid loosening during operation. The design of the bottom sealing ring can achieve effective sealing to avoid leakage. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The above and other features, properties and advantages of the present invention will become more apparent through the following description in conjunction with the accompanying drawings and embodiments, in which:

[0015] Figure 1 It is a simplified diagram of the structure of an aircraft engine;

[0016] Figure 2 It is a schematic diagram of the structure of the combustion chamber;

[0017] Figure 3 It is an assembly cross-sectional view of the borescope plug structure;

[0018] Figure 4 It is a schematic diagram of the pressure plate and the locking groove being in a matched state;

[0019] Figure 5 It is a schematic diagram of the plug;

[0020] Figure 6 It is a schematic diagram of the structure of the locking block;

[0021] Figure 7 It is a structural diagram of the hole probe seat;

[0022] Figure 8 It is a schematic diagram of the plug, the locking block and the hole probe seat in the initial assembly state;

[0023] Fig. 9 This is a schematic diagram of the position after the plug is pressed down.

[0024] Symbols and Markings

[0025] 1 Compressor

[0026] 2 Combustion chamber

[0027] 3 Turbine

[0028] 4 Fan

[0029] 21 Flame Tube

[0030] 22 Fuel nozzle

[0031] 23 Receiver

[0032] 24 Diffuser

[0033] 30 Plug

[0034] 31 Buckle

[0035] 32 Locking slot

[0036] 33 Sealing end face

[0037] 34 Column

[0038] 35 Cover

[0039] 40 Locking block

[0040] 42 Ring mouth

[0041] 43 Ring mouth

[0042] 44 Pressure Plate

[0043] 46 Step structure

[0044] 50 hole probe holder

[0045] 51 Raised ring

[0046] 52 Flanging

[0047] 53 Card slots

[0048] 54 Axial hole

[0049] 55 Annular flange

[0050] 60 Spring

[0051] 70 Sealing Ring

[0052] 341 First Pillar

[0053] 342 Second Column DETAILED DESCRIPTION

[0054] The present invention is further described below in conjunction with specific embodiments and drawings. More details are elaborated in the following description to facilitate a full understanding of the present invention. However, the present invention can obviously be implemented in a variety of other ways different from the description herein. Those skilled in the art can make similar generalizations and deductions based on actual application situations without violating the connotation of the present invention. Therefore, the protection scope of the present invention should not be limited by the content of this specific embodiment.

[0055] It should be noted that these and other subsequent drawings are only examples and are not drawn to scale, and should not be used to limit the actual scope of protection required by the present invention.

[0056] Figure 1 The schematic diagram of the structure of the aircraft engine is shown, which includes a compressor 1, a combustion chamber 2 and a turbine 3. The compressor 1 compresses the air and burns it in the combustion chamber 2, then works on the turbine 3, converting the chemical energy of the fuel into mechanical energy of the turbine. The turbine discharges the combustion gas and drives the fan 4 to generate thrust.

[0057] Figure 2 The structure of the combustion chamber is shown, and the plug 30 of the borehole probe plug structure is installed on the combustion chamber 2. The combustion chamber 2 mainly includes a flame tube 21, a fuel nozzle 22, a combustion chamber casing 23, a diffuser 24 and other components. The compressed airflow generated by the compressor 1 is decelerated and expanded by the diffuser 24, and then enters the flame tube 21 and mixes with the fuel sprayed by the fuel nozzle 22, thereby achieving combustion. The environment in which the flame tube 21 and the fuel nozzle 22 are located is very harsh, and regular route borehole probe inspections are required.

[0058] When the borescope is inserted for inspection, the borescope plug 30 needs to ensure good sealing performance to prevent high-temperature gas leakage. In addition, considering the assembly efficiency, the borescope plug 30 is also expected to have a simpler structure and a more convenient assembly method.

[0059] Reference Figures 3 to 7 As shown, the bore probe plug structure described in the present disclosure includes a bore probe seat 50, a plug 30, a locking block 40 and a spring 60.

[0060] like Figure 7 As shown, the bore probe seat 50 is arranged in the hole on the housing structure such as the casing, and can be integrally formed by processing or welding. The bore probe seat 50 includes an axial hole 54, a raised ring body 51, a flange 52 and a slot 53, and the flange 52 and the slot 53 are arranged on the raised ring body 51. The flange 52 and the slot 53 are evenly distributed at two locations in the circumferential direction, and are respectively used to install the bore probe plug 30 and the locking block 40 to achieve radial limit and anti-rotation.

[0061] Plug 30 Figure 5 As shown, it includes a column 34 and a cover 35, the cover 35 includes a buckle 31 and a locking groove 32, the buckle 31 is used to engage with the flange 52 of the bore probe seat 50, and the column 34 passes through the axial hole 54 of the bore probe seat 50 for blocking. The buckle 31 on the plug 30 cooperates with the flange 52 of the bore probe seat 50 on the receiver to achieve radial and axial limited installation.

[0062] The plug 30 is arranged to be rotatable and axially movable in the axial hole 54 .

[0063] The locking block 40 is as follows Figure 6 As shown, the whole is sleeved on the outer periphery of the column 34 of the plug 30, including a radially extending pressure plate 44 and an annular opening 42. The pressure plate 44 is accommodated in the locking groove 32 and the clamping groove 53, and the annular opening 42 cooperates with the cover 35 of the plug 30. That is, after the plug 30 is installed, the locking groove 32 of the plug is located at the clamping groove 53 of the hole probe seat 50, and the two form a cavity. The pressure plate 44 is located in the cavity formed by the locking groove 32 and the clamping groove 53, and extends radially for downward pressure when disassembling, as shown in FIG. Figure 4 shown.

[0064] The spring 60 is sleeved on the outer periphery of the column 34 of the plug 30, and the two ends are respectively against the inner sides of the locking block 40 and the hole probe seat 50. Through the elastic force of the spring 60, the end of the locking block 40 is pressed against the plug cover 35 to achieve axial limit.

[0065] Thus, the locking block 40 is sleeved in the bore probe plug 30, and the spring 60 is used to realize expansion and contraction, and the annular opening 42 of the locking block 40 is pressed against the bore probe plug 30. The pressing plate 44 on the locking block 40 is clamped in the locking groove 32 of the bore probe plug 30 to realize locking and preventing loosening.

[0066] The locking block 40 also includes a hollow cylindrical section 43, and the axial hole 54 guides and installs the cylindrical section 43. The spring 60 is arranged in the cylindrical section 43, and the cylindrical section 43 cooperates with the axial hole 54 on the hole probe seat 50 to provide guidance for the installation of the spring 60 and also provide a limit for the deformation of the spring 60.

[0067] In one embodiment, the pressing plate 44 includes a step structure 46 for engaging with the locking groove 32 to form a Figure 4 The mating status shown.

[0068] In the embodiment shown in the drawings, the buckle 31 and the locking groove 32 are evenly distributed at two locations around the circumference, and correspondingly, the pressing plate 44 is also evenly distributed at two locations around the circumference. It can be understood that the number of the locking groove 32, the pressing plate 44 and the card slot 53 is the same, and can also be set to other numbers.

[0069] To achieve sealing, the column 34 includes a first column 341 and a second column 342. The diameter of the second column 342 is smaller than that of the first column 341. A sealing end surface 33 is provided at the connection between the first column 341 and the second column 342. Figure 5 In the structure, the third column 343 is smaller than the second column. The sealing end face 33 is matched with Figure 2 The sealing ring 70 shown is arranged between the sealing end face 33 and the bore probe seat 50. The sealing ring 70 is closely matched with the sealing end face 33 and the bore probe seat 50 to achieve the overall sealing of the bore probe hole structure.

[0070] The sealing ring is preferably a W sealing ring, which has a better sealing effect. If there is enough pressing force, a sealing structure such as a C-ring can also be used to achieve leakage sealing of the entire borehole installation structure.

[0071] In some embodiments, Figure 7 As shown, the hole probe seat 50 also includes an annular flange 55 arranged at the end of the axial hole 54 for the spring 60 and the sealing ring 70 to abut against.

[0072] Installation method: Figure 8 and Fig. 9 shown.

[0073] During the installation process, first place the sealing ring 70 on the annular convex edge 55 of the bore probe seat 50, and place the compression spring 60 into the cylindrical section 43 of the locking block 40. The spring 60 can be pre-fixed by spot welding to prevent it from falling. Place the locking block 40 in the axial hole 54 of the bore probe seat 50, so that the pressure plate 44 of the locking block 40 is placed in the card slot 53.

[0074] The cylinder 34 of the plug 30 is passed through the cylindrical section 43, and the cover 35 is placed on the upper side of the locking block 40, so that the buckle 31 is aligned with the pressure plate 44.

[0075] Press down hard in the direction P to compress the spring 60, and the plug 30 moves downward at the same time. Fig. 9 shown.

[0076] After the spring 60 is compressed to a certain distance, the plug 30 is rotated. After rotating 90°, the buckle 31 is fastened to the flange 52. At this time, under the elastic restoring force of the spring 60, the locking block 40 will automatically pop up, so that the pressure plate 44 fits with the locking groove 32, and the installation of the plug structure is completed.

[0077] During disassembly, only the pressing plate 44 is pressed downwards, at which time the plug 30 and the locking block 40 are separated from each other, and then the plug is rotated 90° to disengage the buckle 31 from the flange 52, and the disassembly is completed.

[0078] The above-mentioned bore probe plug structure uses a spring buckle to achieve locking to prevent the bore probe plug from loosening during installation. It does not require the use of a traditional multi-component welding structure. It uses a 90-degree press-and-rotate installation, which can be easily installed and disassembled without the wear problem caused by frequent friction, and can effectively increase the service life. In addition, through the design of the step structure, sealing end face and other designs, the structural dimensions are used to achieve precise limit, so that the plug structure as a whole is a threadless structure, the installation accuracy is not affected by the thread torque, and it is not easy to produce high-temperature bonding. A sealing ring is added to avoid leakage of high-temperature gas.

[0079] It should be noted that the above content uses words such as "first" and "second" to limit components, which is only for the convenience of distinguishing the corresponding components. If not otherwise stated, the above words have no special meaning and therefore cannot be understood as limiting the scope of protection of this application.

[0080] At the same time, the present application uses specific words to describe the embodiments of the present application. For example, "one embodiment", "an embodiment", and / or "some embodiments" refer to a certain feature, structure or characteristic related to at least one embodiment of the present application. Therefore, it should be emphasized and noted that "one embodiment" or "an embodiment" or "an alternative embodiment" mentioned twice or more in different positions in this specification does not necessarily refer to the same embodiment. In addition, some features, structures or characteristics in one or more embodiments of the present application can be appropriately combined.

[0081] Although the present invention is disclosed as above with preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art may make possible changes and modifications without departing from the spirit and scope of the present invention. Therefore, any modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention without departing from the content of the technical solution of the present invention shall fall within the protection scope defined by the claims of the present invention.

Claims

1. The bore probe plug structure is installed on the orifice of the housing, characterized in that: The structure includes: A hole probe seat is arranged in the hole opening, comprising an axial hole, a raised ring body, a flange and a slot, wherein the flange and the slot are arranged on the raised ring body; The plug includes a column and a cover, wherein the cover includes a buckle and a locking groove, the buckle is used to engage with the flange, and the column passes through the axial hole; A locking block, sleeved on the outer periphery of the column, comprising a radially extending pressing plate, wherein the pressing plate is accommodated in the locking groove and the clamping groove; and The spring is sleeved on the outer periphery of the column, and two ends of the spring are respectively against the locking block and the hole detection seat.

2. The bore probe plug structure according to claim 1, characterized in that: The column includes a first column, a second column and a sealing end surface located at the connection between the first column and the second column. The structure also includes a sealing ring arranged between the sealing end surface and the bore probe seat.

3. The bore probe plug structure according to claim 2, characterized in that: The hole probe seat also includes an annular convex edge arranged at the end of the axial hole for the spring and the sealing ring to abut against.

4. The bore probe plug structure according to claim 2, characterized in that: The sealing ring is a W-shaped sealing ring or a C-shaped sealing ring.

5. The bore probe plug structure according to claim 1, characterized in that: The pressing plate includes a step structure for fitting with the locking groove.

6. The bore probe plug structure according to claim 1, characterized in that: The locking block further comprises a cylindrical section, and the spring is arranged in the cylindrical section.

7. The bore probe plug structure according to claim 1, characterized in that: The plug is configured to be rotatable and axially movable within the axial hole.

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