CN113864315A - Thread anti-loosening structure in closed cavity - Google Patents
Thread anti-loosening structure in closed cavity Download PDFInfo
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- CN113864315A CN113864315A CN202111127953.0A CN202111127953A CN113864315A CN 113864315 A CN113864315 A CN 113864315A CN 202111127953 A CN202111127953 A CN 202111127953A CN 113864315 A CN113864315 A CN 113864315A
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- closed cavity
- cavity
- thread
- cover plate
- spring
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- 230000002093 peripheral effect Effects 0.000 claims description 6
- 238000000034 method Methods 0.000 abstract description 9
- 238000003466 welding Methods 0.000 abstract description 4
- 239000000446 fuel Substances 0.000 description 8
- 238000010586 diagram Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 239000000295 fuel oil Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
- F16B39/00—Locking of screws, bolts or nuts
- F16B39/02—Locking of screws, bolts or nuts in which the locking takes place after screwing down
- F16B39/10—Locking of screws, bolts or nuts in which the locking takes place after screwing down by a plate, spring, wire or ring immovable with regard to the bolt or object and mainly perpendicular to the axis of the bolt
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Connection Of Plates (AREA)
Abstract
The utility model provides a screw thread anti loosening structure in closed cavity, the screw thread anti loosening structure in closed cavity includes apron, object spare, looks accessory and shell body, and wherein, the accessory is installed inside the shell body, is provided with the inner chamber in the accessory, and the object spare is installed in inner chamber one end, apron and shell body fixed connection. The internal thread anti-loose structure of the closed cavity completely fixes the cover plate by welding, the cover plate tightly presses and limits the movement of the fitting in the axial direction, and the hexagonal boss on the cover plate is matched with the hexagonal hole on the object to limit the movement of the object in the circumferential direction, so that the object and the fitting are prevented from being loosened in the use process, the reliability of the internal thread connection of the closed cavity is ensured, and the assembly state of parts is not changed in the use process.
Description
Technical Field
The invention belongs to the technical field of engines, and particularly relates to a thread anti-loosening structure in a closed cavity.
Background
In the structural design of an aircraft engine, a threaded connection structure is generally required to be adopted in a closed cavity. For example, a threaded connection structure is arranged in a fuel distributor in a fuel nozzle shell closed cavity, a cover plate compresses a fuel distributor cavity in the nozzle shell closed cavity, the cover plate is sealed with the shell closed cavity in a matched mode, the fuel distributor guarantees the assembly state of other precise parts through a pressing ring (other parts are not shown in the schematic diagram), the pressing ring is in threaded connection with the fuel distributor cavity, and the pressing ring is assembled to a specific position through a tool during assembly. Due to the particularity of the use performance of the fuel oil distributor, the pressing ring needs to be ensured to be in a certain fixed position in the use process so as to ensure the working performance of internal parts, and therefore the phenomenon that the screw thread is loosened in the use process needs to be prevented. And fuel nozzle often can lead to clamping ring and fuel distributor cavity threaded connection to appear becoming flexible because of the vibration in the use, leads to the position change of clamping ring, influences the assembled state of other precision parts to influence fuel nozzle's performance.
The common thread anti-loosening measure is to add a fuse hole on a threaded part, and the phenomenon of thread loosening is prevented by adding a fuse.
At present, a method for preventing threads from loosening by adding fuses can only be applied to an external threaded connection structure due to structural particularity, and an object part needs to have enough space to add fuse holes, so that the method is not suitable for threaded connection structures which are positioned in a closed cavity and are used for precise parts.
Disclosure of Invention
Aiming at the problems, the invention provides a thread anti-loosening structure in a closed cavity, which can ensure the reliability of threaded connection in the closed cavity, thereby ensuring safe and reliable work of parts.
In order to achieve the purpose, the invention adopts the following technical scheme:
the thread anti-loosening structure in the closed cavity comprises a cover plate, an object piece, a fitting and an outer shell, wherein,
the phase part is arranged inside the outer shell;
an inner cavity is arranged in the fitting part;
the object piece is arranged at one end of the inner cavity;
the cover plate is fixedly connected with the outer shell.
Preferably, the outer shell is of a cylindrical structure, the closed cavity is arranged in the outer shell, and one end of the closed cavity is provided with an inner annular cavity which is step-shaped with the closed cavity.
Preferably, the fitting is of a cylindrical structure and is coaxial with the outer shell, an inner cavity of the fitting is cylindrical, and an inner thread is arranged on the inner wall of one end, close to the inner ring cavity, of the inner cavity.
Preferably, the cover plate is of a disc-shaped structure, one end face of the cover plate is a pressing face, the peripheral side face of the cover plate is an outer ring face, a vertical hexagonal boss is fixedly connected to the circle center of the pressing face, and the outer ring face is welded to the inner wall of the inner ring cavity.
Preferably, the object is a revolving body structure, the cross section of the object is in a T shape, external threads are arranged on the peripheral side of the object, a hexagonal hole corresponding to the hexagonal boss is formed in the center of one end face of the object, the object is sleeved on the hexagonal boss through the hexagonal hole, and the object is matched with the internal threads of the fitting through the external threads.
Preferably, the pressing surface of the cover plate abuts against one end of the matching part.
Preferably, the cover plate is arranged coaxially with the object.
Preferably, the inner cavity is further connected with a spring thimble in a sliding manner, one end, close to the object, of the spring thimble is of a revolving body structure, the cross section of the spring thimble is in an inverted T shape, one end, far away from the object, of the spring thimble is provided with a screw, the screw is connected with a piston in a threaded manner, and the piston is located in the inner cavity.
Preferably, a spring is further installed in the inner cavity, one end of the spring is connected with the object piece, and the other end, far away from the object piece, of the spring is connected with the spring thimble.
Preferably, the spring is coaxially arranged with the spring thimble.
Preferably, the bottom of the closed cavity is also fixedly connected with a plurality of bases, and one end of each base abuts against the bottom of the corresponding part.
Preferably, the bottom of the outer shell is provided with a through hole communicated with the closed cavity.
The invention has the beneficial effects that:
the internal thread anti-loose structure of the closed cavity completely fixes the cover plate by welding, the cover plate tightly presses and limits the movement of the fitting in the axial direction, and the hexagonal boss on the cover plate is matched with the hexagonal hole on the object to limit the movement of the object in the circumferential direction, so that the object and the fitting are prevented from being loosened in the use process, the reliability of the internal thread connection of the closed cavity is ensured, and the assembly state of parts is not changed in the use process.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and those skilled in the art can also obtain other drawings according to the drawings without creative efforts.
FIG. 1 shows a schematic view of a thread anti-loosening arrangement within an enclosed cavity of the present invention;
FIG. 2 is a schematic diagram of a cover plate structure of a thread anti-loosening structure in a closed cavity according to the present invention;
FIG. 3 is a schematic structural view of an object of the thread loosening prevention structure in the closed cavity according to the present invention;
fig. 4 shows a schematic view of the assembly of the object and the counterpart of the thread anti-loosening structure in the closed cavity according to the present invention.
In the figure: 1. a cover plate; 11. a hexagonal boss; 12. an outer annular surface; 13. a compression surface; 2. an object; 21. a hexagonal hole; 22. an external thread; 3. a phase fitting; 31. an internal thread; 32. an inner cavity; 4. an outer housing; 41. an inner ring cavity; 42. a closed cavity; 43. a through hole; 5. a spring; 6. a spring thimble; 7. a piston; 8. a base.
Detailed Description
In order to make the objects, 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 with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention provides a thread anti-loosening structure in a closed cavity, as shown in figure 1, the thread anti-loosening structure of the closed cavity 42 comprises a cover plate 1, an object part 2, a fitting part 3 and an outer shell 4, wherein,
the fitting 3 is mounted inside the outer shell 4;
an inner cavity 32 is arranged in the fitting part 3;
the object 2 is mounted at one end of the inner cavity 32;
the cover plate 1 is fixedly connected with the outer shell 4.
Further, the outer shell 4 is a cylinder structure, the closed cavity 42 is arranged in the outer shell 4, and one end of the closed cavity 42 is provided with an inner ring cavity 41 which is step-shaped with the closed cavity 42.
In the above structure, the inner ring cavity 41 is communicated with the closing cavity 42, and the diameters of the inner ring cavity 41 and the closing cavity 42 are different, so that a step structure is generated.
Further, the fitting part 3 is of a cylindrical structure and is arranged coaxially with the outer shell 4, an inner cavity 32 of the fitting part 3 is of a cylindrical shape, and an inner thread 31 is arranged on an inner wall of one end, close to the inner ring cavity 41, of the inner cavity 32.
In the above structure, the counterpart 3 is installed in the outer case 4.
Further, as shown in fig. 2, the cover plate 1 has a disc-shaped structure, one end surface is a pressing surface 13, the peripheral side surface is an outer annular surface 12, a vertical hexagonal boss 11 is fixedly connected to the center position of the pressing surface 13, the outer annular surface 12 is welded to the inner wall of the inner annular cavity 41, and the pressing surface 13 of the cover plate 1 abuts against one end of the fitting 3.
In the structure, the cover plate 1 utilizes the pressing surface 13 to press the fitting part 3 to prevent the fitting part from moving in the closed cavity 42 and keep stable, and then the outer ring surface 12 of the cover plate 1 and the inner ring cavity 41 are welded to fix the cover plate 1 and ensure that the fitting part 3 can be pressed all the time.
Further, as shown in fig. 3, the object 2 is a revolving body structure, the cross section of the revolving body structure is T-shaped, the peripheral side surface of the revolving body structure is provided with an external thread 22, the center of one end surface of the revolving body structure is provided with a hexagonal hole 21 corresponding to the hexagonal boss 11, the object 2 is sleeved on the hexagonal boss 11 through the hexagonal hole 21, and the object 2 is matched with the internal thread 31 of the counterpart 3 through the external thread 22.
In the above structure, the object 2 can be installed in the inner cavity 32 by screw-fitting, and then the hexagonal boss 11 and the hexagonal hole 21 are used for fitting in order to prevent the object 2 from rotating in the inner cavity 32, so that the object 2 is kept still and is stably installed.
Further, as shown in fig. 4, the cover plate 1 is disposed coaxially with the object 2, which enables the hexagonal boss 11 and the hexagonal hole 21 to be positioned better.
Further, as shown in fig. 1, the inner cavity 32 is further slidably connected with a spring thimble 6, one end of the spring thimble 6 close to the object 2 is a revolving body structure, the cross section of the spring thimble 6 is in an inverted T shape, one end far away from the object 2 is provided with a screw, the screw is in threaded connection with a piston 7, and the piston 7 is located in the inner cavity 32.
In the above structure, the spring thimble 6 can slide in the inner cavity 32 to and fro, and further drives the piston 7 to move in the inner cavity 32 to and fro.
Furthermore, a spring 5 is further installed in the inner cavity 32, and two ends of the spring 5 are respectively and fixedly connected with the object 2 and the spring thimble 6.
In the above structure, the spring 5 is compressed when the spring thimble 6 moves toward the spring 5, and then the spring is restored by the resilient force of the spring 5.
It should be noted that, because spring 5 one side and object 2 fixed connection, and object 2 is because hexagonal boss 11 is unable to rotate to can guarantee that spring 5 one end can not take place the displacement, consequently when piston 7 resets the back, the initial resilience force of spring 5 is unchangeable all the time, when external pressure promoted piston 7 toward the one side motion of extrusion spring 5, the resilience force numerical value of spring 5 can guarantee the accuracy, therefore can make clear the pressure numerical value when applying external pressure.
Further, the spring 5 is coaxially arranged with the spring thimble 6.
In the structure, the spring 5 and the spring thimble 6 are coaxial, so that the resilience force can be uniformly distributed on the spring thimble 6 when the spring 5 rebounds, and the stress is uniform.
Further, the bottom of the closed cavity 42 is also fixedly connected with a plurality of bases 8, and one end of each base 8 abuts against the bottom of the corresponding component 3.
Further, the bottom of the outer shell 4 is opened with a through hole 43 communicating with the closed cavity 42.
In the above structure, the through hole 43 can be connected with an external pressure pipe, thereby pressurizing the inside of the device and pushing the piston 7 to move toward the spring 5 side.
In summary, in the present invention, the object 2 and the counterpart 3 are connected to the internal thread 31 through the external thread 22, and are located in the closed cavity 42, after the object 2 is assembled to the set position through the threaded connection, the counterpart 3 is pressed tightly by the pressing surface 13 of the cover plate 1, the hexagonal boss 11 on the cover plate 1 is engaged with the hexagonal hole 21 on the object 2, the outer annular surface 12 on the cover plate 1 is engaged with the inner wall of the inner annular cavity 41 and is sealed by welding, because the cover plate 1 and the inner annular cavity 41 are sealed by welding, the cover plate 1 is not loosened at all during use, the hexagonal boss 11 on the cover plate 1 is engaged with the hexagonal hole 21 on the object 2, and the loosening of the object 2 in the circumferential direction is limited, and the pressing surface 13 of the cover plate 1 presses the counterpart 3, and the loosening of the counterpart 3 in the axial direction is limited, because the loosening of the threaded connection object 2 in the circumferential direction and the loosening of the counterpart 3 in the circumferential direction are also limited, therefore, the looseness of the object part 2 and the fitting part 3 in the circumferential direction and the axial direction is limited, so that the looseness of the threaded connection in the use process is limited, the spring 5 can always ensure that the initial deformation is unchanged, the elastic force is stable, and the pressurization adjustment is facilitated.
The thread anti-loosening structure is simple and high in reliability, and can be applied to the thread connection structure of the closed cavity 42 and the precise parts.
Although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (12)
1. The utility model provides a screw thread anti loosening structure in closed cavity which characterized in that: the thread anti-loosening structure of the closed cavity (42) comprises a cover plate (1), an object piece (2), a fitting piece (3) and an outer shell (4),
the fitting part (3) is arranged inside the outer shell (4);
an inner cavity (32) is arranged in the fitting part (3);
the object (2) is arranged at one end of the inner cavity (32);
the cover plate (1) is fixedly connected with the outer shell (4).
2. A thread anti-loosening structure in a closed cavity according to claim 1, wherein the outer shell (4) is of a cylindrical structure, the closed cavity (42) is arranged in the outer shell (4), and one end of the closed cavity (42) is provided with an inner ring cavity (41) which is stepped with the closed cavity (42).
3. The thread anti-loosening structure in the closed cavity as claimed in claim 2, wherein the fitting part (3) is of a cylindrical structure and is arranged coaxially with the outer shell (4), the inner cavity (32) of the fitting part (3) is of a cylindrical shape, and an inner wall of one end, close to the inner ring cavity (41), of the inner cavity (32) is provided with an internal thread (31).
4. The thread locking structure in a closed cavity as claimed in claim 2, wherein the cover plate (1) is a disc-shaped structure, one end surface is a pressing surface (13), the peripheral side surface is an outer annular surface (12), a vertical hexagonal boss (11) is fixedly connected to the center position of the pressing surface (13), and the outer annular surface (12) is welded with the inner wall of the inner annular cavity (41).
5. The thread anti-loosening structure in the closed cavity as claimed in claim 4, wherein the object (2) is a revolving body structure, the cross section of the object is T-shaped, the peripheral side surface of the object is provided with an external thread (22), the center of one end surface of the object is provided with a hexagonal hole (21) corresponding to the hexagonal boss (11), the object (2) is sleeved on the hexagonal boss (11) through the hexagonal hole (21), and the object (2) is matched with the internal thread (31) of the fitting part (3) through the external thread (22).
6. A thread lock in a closed cavity according to any one of claims 4 or 5, wherein the pressing surface (13) of the cover plate (1) abuts against one end of the counterpart (3).
7. A thread anti-loosening structure in a closed cavity according to claim 1, wherein the cover plate (1) is coaxially arranged with the object (2).
8. The thread anti-loosening structure in the closed cavity as claimed in claim 3, wherein the inner cavity (32) is further connected with a spring thimble (6) in a sliding manner, one end of the spring thimble (6) close to the object (2) is of a revolving body structure, the cross section of the spring thimble is in an inverted T shape, one end far away from the object (2) is provided with a screw rod, the screw rod is connected with a piston (7) in a threaded manner, and the piston (7) is located in the inner cavity (32).
9. The thread looseness-prevention structure in the closed cavity as claimed in claim 8, wherein a spring (5) is further installed in the inner cavity (32), one end of the spring (5) is connected with the object (2), and the other end, far away from the object (2), of the spring (5) is connected with the spring ejector pin (6).
10. A thread anti-loosening structure in a closed cavity according to claim 9, wherein the spring (5) is coaxially arranged with the spring thimble (6).
11. The thread anti-loosening structure in the closed cavity according to any one of claims 2 to 4, wherein a plurality of bases (8) are fixedly connected to the bottom of the closed cavity (42), and one end of each base (8) abuts against the bottom of the corresponding fitting part (3).
12. The thread anti-loosening structure in the closed cavity as claimed in claim 2, wherein the bottom of the outer shell (4) is provided with a through hole (43) communicated with the closed cavity (42).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111127953.0A CN113864315A (en) | 2021-09-26 | 2021-09-26 | Thread anti-loosening structure in closed cavity |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111127953.0A CN113864315A (en) | 2021-09-26 | 2021-09-26 | Thread anti-loosening structure in closed cavity |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113864315A true CN113864315A (en) | 2021-12-31 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111127953.0A Pending CN113864315A (en) | 2021-09-26 | 2021-09-26 | Thread anti-loosening structure in closed cavity |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113864315A (en) |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0691499A1 (en) * | 1994-07-06 | 1996-01-10 | ARMATURENFABRIK HERMANN VOSS GMBH & CO. | Connection device for pressure pipes |
| JPH1052655A (en) * | 1996-05-03 | 1998-02-24 | Satronic Ag | Nozzle shut-off valve and pressure spray nozzle having the same |
| CN102108919A (en) * | 2009-12-29 | 2011-06-29 | 上海世德子汽车零部件有限公司 | Electric fuel pressure regulator |
| CN105659773B (en) * | 2009-12-31 | 2013-11-13 | 北京航科发动机控制系统科技有限公司 | A kind of fuel dispenser |
| CN104895716A (en) * | 2015-04-15 | 2015-09-09 | 北京航科发动机控制系统科技有限公司 | Fuel oil storage device for fuel oil distributor |
| CN105673209A (en) * | 2016-01-14 | 2016-06-15 | 中国航空动力机械研究所 | Fuel distributor used for aircraft engine fuel system and aircraft engine |
| CN108386871A (en) * | 2018-01-10 | 2018-08-10 | 成都航利航空科技有限责任公司 | A kind of adjustable engine centrifugal formula fuel nozzle of flow |
| CN212838901U (en) * | 2020-08-27 | 2021-03-30 | 安顺中安安装工程有限公司 | Screw thread anti-loosening device |
-
2021
- 2021-09-26 CN CN202111127953.0A patent/CN113864315A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0691499A1 (en) * | 1994-07-06 | 1996-01-10 | ARMATURENFABRIK HERMANN VOSS GMBH & CO. | Connection device for pressure pipes |
| JPH1052655A (en) * | 1996-05-03 | 1998-02-24 | Satronic Ag | Nozzle shut-off valve and pressure spray nozzle having the same |
| CN102108919A (en) * | 2009-12-29 | 2011-06-29 | 上海世德子汽车零部件有限公司 | Electric fuel pressure regulator |
| CN105659773B (en) * | 2009-12-31 | 2013-11-13 | 北京航科发动机控制系统科技有限公司 | A kind of fuel dispenser |
| CN104895716A (en) * | 2015-04-15 | 2015-09-09 | 北京航科发动机控制系统科技有限公司 | Fuel oil storage device for fuel oil distributor |
| CN105673209A (en) * | 2016-01-14 | 2016-06-15 | 中国航空动力机械研究所 | Fuel distributor used for aircraft engine fuel system and aircraft engine |
| CN108386871A (en) * | 2018-01-10 | 2018-08-10 | 成都航利航空科技有限责任公司 | A kind of adjustable engine centrifugal formula fuel nozzle of flow |
| CN212838901U (en) * | 2020-08-27 | 2021-03-30 | 安顺中安安装工程有限公司 | Screw thread anti-loosening device |
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Application publication date: 20211231 |
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