Hole exploration plug

Abstract

The borescope plug comprises a plug body and a shell, the plug body comprises a first plugging body located on the upper portion, the first plugging body comprises a rotating groove and a locking groove, the rotating groove is an annular groove, and part of the locking groove is communicated with the interior of the rotating groove; the shell is arranged outside the first plugging body in a sleeving mode and comprises an outer shell, a top shell and an opening located in the top shell, and a first installation key is further arranged on the inner side wall, where the opening is formed, of the top shell. Wherein the inner side wall is matched with the rotating groove, and the first mounting key is used for being clamped with the stop groove so as to fix the plug and the shell. According to the borescope plug, the first mounting key is designed on the shell to be clamped with the stop groove, so that the positioning and anti-rotation effects are achieved. The borescope plug is simple in structure, capable of being quickly disassembled and assembled and convenient to maintain.

Description

Technical Field

[0001] The utility model relates to the field of aviation engines, in particular to the field of borehole plugs. Background Art

[0002] The borescope inspection interface is usually directly arranged on the casing of each engine component. China's public patent CN115389205 provides a borescope plug device for aircraft engines, referring to Fig.10 As shown, it includes a housing 1', a plug 2, a locking pin 3, an elastic member 4, a first self-locking ratchet 5, a second self-locking ratchet 6 and a sealing assembly 7'. The housing 1' includes a housing mounting keyway and a threaded hole arranged on its upper portion. The plug 2 includes an upper threaded portion, a plug mounting keyway, a sealing groove and a lower threaded portion. The upper threaded portion is arranged on the upper portion of the plug 2 and is used to engage with the threaded hole of the housing 1'. However, when the plug is used for high-temperature components, the high temperature easily causes the threads to stick, making the bore probe plug difficult to repair. Utility Model Content

[0003] One purpose of the utility model is to provide a bore probe plug which is easy to maintain.

[0004] To achieve the above-mentioned purpose, a borehole probe plug is used to seal an engine casing, and includes a plug and a casing, the plug including a first sealing body located at the upper part, the first sealing body including a rotation groove and a stop groove, the rotation groove is an annular groove, and part of the stop groove is connected to the rotation groove; the casing is sleeved on the outside of the first sealing body, and includes an outer shell, a top shell and an opening located on the top shell, and the inner side wall of the top shell forming the opening is also provided with a first installation key; wherein the inner side wall cooperates with the rotation groove, and the first installation key is used to engage with the stop groove to fix the plug and the casing.

[0005] In one or more embodiments, a groove width of the rotation groove is greater than a thickness of the inner side wall.

[0006] In one or more embodiments, the shell and the first sealing body define an annular cavity, and the annular cavity is used to accommodate an elastic member so that the shell can move up and down relative to the plug.

[0007] In one or more embodiments, the bore probe plug further includes a self-locking upper ratchet and a self-locking lower ratchet that cooperate with each other, the bottom of the shell abuts against the self-locking lower ratchet, and the lower part of the elastic member abuts against the self-locking upper ratchet.

[0008] In one or more embodiments, the borescope plug further includes a locking pin located between the top shell and the elastic member, and an upper portion of the elastic member abuts against the locking pin.

[0009] In one or more embodiments, the engine housing includes a countersunk hole with an internal thread provided therein, and the plug also includes a second sealing body located at the lower portion, and the second sealing body includes an external thread matching the internal thread.

[0010] In one or more embodiments, the plug includes a shoulder connecting the first sealing body and the second sealing body, and the shoulder is pressed on the table surface of the countersunk hole.

[0011] In one or more embodiments, the borescope plug further includes a gasket located between the table and the shoulder, and the second sealing body includes a sealing groove for accommodating the gasket.

[0012] In one or more embodiments, the first blocking portion is provided with an axially extending mounting keyway, and the mounting keyway is arranged simultaneously above and below the rotation slot.

[0013] In one or more embodiments, the retaining groove is arranged between two adjacent mounting key grooves.

[0014] The above-mentioned bore probe plug is provided with a first installation key on the housing, and the housing is rotated to pass the installation key of the housing through the rotation groove of the plug, so that its circumferential position is aligned with the stop groove of the plug, and then the installation key of the housing is clamped into the stop groove of the plug with the help of spring force, so as to achieve the effect of positioning and anti-rotation. The structure is simple, can be quickly disassembled and assembled, and is easy to maintain. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] 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:

[0016] Figure 1 It is a cross-sectional view of the housing of the bore probe plugging device after rotation and assembly;

[0017] Figure 2 It is a cross-sectional view of the housing of the bore probe plug device before rotation and assembly;

[0018] Figure 3 is a schematic diagram of the shell;

[0019] Figure 4 is a schematic diagram of the locking pin;

[0020] Figure 5 It is a schematic diagram of a self-locking ratchet;

[0021] Figure 6 It is a schematic diagram of a self-locking lower ratchet;

[0022] Figure 7 is a schematic diagram of the gasket;

[0023] Figure 8It is a schematic diagram of the plug;

[0024] Fig. 9 It is a schematic diagram of the borescope plug sealing the engine housing;

[0025] Fig.10 It is a schematic diagram of the existing borehole probe plug structure. DETAILED DESCRIPTION

[0026] 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. 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.

[0027] It should be noted that these and other subsequent drawings are only examples and are not drawn in proportion, and should not be used as a limitation on the actual scope of protection required by the present utility model.

[0028] Fig.10 The structure of the existing borehole probe plug is shown, including a housing 1', a plug 2, a locking pin 3, an elastic member 4, a first self-locking ratchet 5, a second self-locking ratchet 6 and a sealing assembly 7'. The sealing assembly 7' is a C-shaped sealing ring. The housing 1' is threadedly connected to the plug 2. However, in a high temperature environment, the threads are easily bonded, making the borehole probe plug difficult to repair. In order to solve the above problem, the utility model provides a borehole probe plug with the function of quick disassembly and assembly.

[0029] Reference Fig. 9 It is understood that the bore probe plug is installed on the engine housing 82, including a shell 1, a plug 2, a locking pin 3, an elastic member 4, a self-locking upper ratchet 5, a self-locking lower ratchet 6, and a gasket 7.

[0030] The plug 2 includes a first sealing body 201 located at the upper part and a second sealing body 202 located at the lower part, which are connected by a shoulder 203. The engine housing 82 includes a countersunk hole 820, and the countersunk hole 820 has a table 81. The shoulder 203 is pressed down on the table 81, and a gasket 7 is also provided between the shoulder 203 and the table 81 for sealing. The gasket 7 is preferably made of metal, and the wall thickness is less than the thread pitch. The gasket 7 includes a plurality of inner ring bosses 71, and the gasket is first screwed into the sealing groove 25 of the plug 2 through the thread. The inner ring boss 71 plays a centering role and prevents the gasket from falling. The gasket can be recycled, which can avoid the problem of more frequent replacement of C-ring seals for borescope inspections, which leads to increased costs.

[0031] The countersunk hole 820 also has an internal thread, and the second blocking body 202 has an external thread 26 that matches the internal thread to achieve thread locking.

[0032] The self-locking lower ratchet 6 abuts against the outer surface of the engine housing 82. Figure 6 As shown, the self-locking lower ratchet 6 includes an anti-rotation structure 62, and a protrusion (not shown) is provided on the engine housing 82, and the anti-rotation function is achieved by the engagement between the protrusion and the anti-rotation structure 62. The self-locking lower ratchet 6 also includes an upper serration structure 61, which cooperates with the lower serration structure 53 of the self-locking upper ratchet 5.

[0033] like Figure 8 As shown, the first plugging body 201 located at the upper part of the plug includes a circumferentially distributed rotation groove 22, a stop groove 23 and an axially extending installation key groove 21. Specifically, the rotation groove 22 is an annular groove, and part of the stop groove 23 is connected to the rotation groove 22. The stop groove 23 is arranged between two adjacent installation key grooves 21, that is, the stop groove and the installation key groove are staggered in circumferential position.

[0034] The installation keyway 21 is provided above and below the rotation slot 22. The installation keyway 21 is a groove, which cooperates with the first installation key 11 protruding from the housing 1, the second installation key 51 protruding from the self-locking upper ratchet 5, and the third installation key 32 of the lock pin 3 during installation.

[0035] like Figure 2 and Figure 3 As shown, the shell 1 is sleeved on the outside of the first blocking body 201, and includes an outer shell 101, a top shell 102 and an opening 103 on the top shell, and a first mounting key 11 is provided on the inner side wall 104 of the top shell 102 forming the opening. The outer shell 1 and the first blocking body 201 define an annular cavity, and the annular cavity is used to accommodate the elastic member 4 so that the shell 1 can move up and down relative to the plug 2. The borehole probe plug also includes a lock pin 3 located between the top shell 1 and the elastic member 4, the upper part of the elastic member 4 abuts against the lock pin 3, and the lower end surface 31 of the lock pin 3 contacts the upper surface of the spring. Pressing down the shell 1 can transfer the downward force to the lock pin 3, and then to the elastic member 4.

[0036] The bottom of the housing 1 abuts against the self-locking lower ratchet 6 , the lower part of the elastic member 4 abuts against the self-locking upper ratchet 5 , and the elastic member 4 contacts the upper end surface 52 of the self-locking upper ratchet 5 .

[0037] The inner side wall 104 of the top shell 102 extends into the rotation groove 22, and the first installation key 11 on the inner side wall 104 is used to engage with the stop groove 23 at a specific position to fix the plug 2 and the housing 1. By pressing down the housing 1, the inner side wall 104 of the top shell 102 is first matched with the rotation groove 22, and then the housing 1 is rotated to align the first installation key 11 with the stop groove 23 in the circumferential direction. After the pressure is removed, under the action of the elastic member 4, the first installation member 11 of the housing 1 is inserted into the stop groove 23 of the plug 2 by elastic force, which plays a positioning and anti-rotation effect, and completes the fixation of the entire top shell 1 and the plug 2.

[0038] like Figure 1 As shown, the groove width of the rotation groove 22 along the up-down direction is preferably greater than the thickness of the inner side wall 104 of the housing 1 along the up-down direction.

[0039] The above structure eliminates the traditional threaded connection method and avoids the problem of inconvenience in disassembly due to high temperature bonding of the thread. The structure is simple, easy to disassemble and repair, and the use of a key and a stop groove with a simple structure makes it easier to disassemble and assemble the borescope plug, improves the maintainability of the borescope plug, and reduces the consumption cost caused by borescope inspection.

[0040] The assembly process of the borehole probe plug is as follows. First, screw the metal gasket 7 into the sealing groove 25 on the plug 2 through the lower thread 26 of the plug 2. Secondly, insert the self-locking lower ratchet 6 into the plug 2 from above, and insert the second installation key 51 of the self-locking upper ratchet 5 into the plug 2 with the help of the installation keyway 21 structure of the plug 2, ensuring that the lower serration structure 53 of the self-locking upper ratchet 5 is engaged with the upper serration structure 61 of the self-locking lower ratchet 6. Then, insert the elastic member 4 from above, and the bottom of the elastic member 4 contacts the upper end face 52 of the self-locking upper ratchet 5. Insert the locking pin 3 into the plug through the installation keyway 21 structure of the plug 2, and the lower end face 31 of the locking pin 3 contacts the upper surface of the elastic member 4. Finally, the third installation key 32 of the locking pin 3 presses down the elastic member 4 through the first installation key 11 of the housing 1. When the upper surface of the installation key 11 of the shell 1 is lower than the upper surface of the rotation groove 22 in the plug 2, start to rotate the shell 1 until the installation key 11 of the shell 1 is aligned with the stop groove 23 of the plug 2, then release the shell 1, and the upper part of the installation key 11 of the shell 1 is stuck into the stop groove 23 of the plug 2 with the help of spring force, completing the entire assembly structure.

[0041] Fig. 9The sealing principle of the bore probe plug is shown. Use a conventional tool sleeve to apply force to the bore probe plug through the mounting groove 24 of the plug 2, and connect the lower thread 26 of the plug 2 to the engine housing 82. After the self-locking lower ratchet 6 contacts the surface of the engine housing 82, the anti-rotation function is achieved by cooperating with the anti-rotation structure 62 on the self-locking lower ratchet 6 and the boss on the engine housing 82. The lower serration structure 53 of the self-locking upper ratchet 5 is engaged with the upper serration structure 61 of the self-locking lower ratchet 6 to achieve the self-locking function. Continue to tighten the bore probe plug downward, and finally form a sealing surface with the engine housing 82 at the table 81 through the gasket 7 to achieve the sealing function.

[0042] 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 multiple times 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.

[0043] Although the utility model is disclosed as above with preferred embodiments, it is not intended to limit the utility model. Any person skilled in the art can make possible changes and modifications without departing from the spirit and scope of the utility model. Therefore, any modification, equivalent change and modification made to the above embodiments based on the technical essence of the utility model without departing from the content of the technical solution of the utility model shall fall within the protection scope defined by the claims of the utility model.

Claims

1. A bore probe plug is used to seal the engine housing, characterized in that: include: The plug includes a first plugging body located at the upper part, wherein the first plugging body includes a rotation groove and a stop groove, wherein the rotation groove is an annular groove, and a part of the stop groove is connected to the rotation groove; A shell, which is sleeved outside the first blocking body, comprises an outer shell, a top shell and an opening on the top shell, and an inner side wall of the top shell forming the opening is also provided with a first installation key; Wherein, the inner side wall cooperates with the rotation groove, and the first installation key is used to engage with the stop groove to fix the plug and the shell.

2. The borescope plug according to claim 1, characterized in that: The groove width of the rotation groove is greater than the thickness of the inner side wall.

3. The borescope plug according to claim 1, characterized in that: The shell and the first blocking body define an annular cavity, and the annular cavity is used to accommodate an elastic member so that the shell can move up and down relative to the plug.

4. The bore probe plug according to claim 3, characterized in that: The bore probe plug also includes a self-locking upper ratchet and a self-locking lower ratchet that cooperate with each other. The bottom of the shell abuts against the self-locking lower ratchet, and the lower part of the elastic member abuts against the self-locking upper ratchet.

5. The borescope plug according to claim 3, characterized in that: The bore probe plug also includes a locking pin located between the top shell and the elastic member, and the upper portion of the elastic member abuts against the locking pin.

6. The borescope plug according to claim 1, characterized in that: The engine housing includes a countersunk hole with an internal thread in the countersunk hole. The plug also includes a second sealing body located at the lower part, and the second sealing body includes an external thread that matches the internal thread.

7. The borescope plug according to claim 6, characterized in that: The plug includes a shoulder connecting the first blocking body and the second blocking body, and the shoulder is pressed on the table surface of the countersunk hole.

8. The borescope plug according to claim 7, characterized in that: The bore probe plug also includes a gasket located between the table and the shoulder, and the second sealing body includes a sealing groove for accommodating the gasket.

9. The borescope plug according to claim 1, characterized in that: The first blocking body is provided with an axially extending mounting keyway, and the mounting keyway is arranged simultaneously above and below the rotating groove.

10. The borescope plug according to claim 9, characterized in that: The retaining groove is arranged between two adjacent installation key grooves.

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