CN218093761U - Anti-loosening structure for threaded connection - Google Patents
Anti-loosening structure for threaded connection Download PDFInfo
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- CN218093761U CN218093761U CN202222434150.6U CN202222434150U CN218093761U CN 218093761 U CN218093761 U CN 218093761U CN 202222434150 U CN202222434150 U CN 202222434150U CN 218093761 U CN218093761 U CN 218093761U
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- loosening
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Abstract
The application relates to the technical field of solid rocket engine structures, especially, relate to a threaded connection's anti loosening structure, include: the combustion chamber comprises a combustion chamber shell, a locking screw and a spray pipe shell; the connecting section of the combustion chamber shell is provided with internal threads, the connecting section of the spray pipe shell is provided with external threads, the connecting section of the spray pipe shell extends into the connecting section of the combustion chamber shell, and the external threads of the connecting section of the spray pipe shell are in threaded connection with the internal threads of the connecting section of the combustion chamber shell; the connecting section of the combustion chamber shell is provided with an anti-loosening threaded hole which penetrates through the inside and the outside, and the anti-loosening threaded hole penetrates through the internal thread of the connecting section of the combustion chamber shell; the anti-loosening screw is screwed into the anti-loosening threaded hole, and the threaded end of the anti-loosening screw is propped against the external thread of the connecting section of the spray pipe shell. This application can play good locking effect to threaded connection.
Description
Technical Field
The application relates to the technical field of solid rocket engine structures, in particular to a locking structure of threaded connection.
Background
The threaded connection is a detachable fixed connection mode which is widely used, and has the advantages of simple structure, reliable connection, convenient detachment and the like. Therefore, a fixed connection method such as a screw connection is widely used as a connection method of front and rear interfaces of a high-pressure vessel such as a combustion chamber of a solid rocket engine. The solid rocket engine can adapt to various environmental conditions with overall requirements along with the missile, ensures reliable connection and complete structure of products, and does not influence the functions and performance of the products. However, the solid rocket engine may have loose threads under the conditions of transportation, vibration, impact and the like, and the loose threads directly cause connection failure and sealing failure, so that the solid rocket engine is burnt through. Therefore, it is critical how to perform anti-loosening treatment on the threaded connection, especially on the threaded connection with the interface with a larger diameter.
The anti-loosening measures generally adopted by threaded connection include modes of applying pretightening force, coating adhesive, applying continuous axial pretightening force by adopting an elastic gasket and the like, but the mode of applying the pretightening force only can still generate displacement in different directions for threaded connection in a vibration environment, so that threads are loosened; in addition, the threaded connection with larger caliber is difficult to adopt a mode of applying continuous pretightening force by an elastic gasket; and the problems that the disassembly of the threaded connection is inconvenient and the cleaning of the threaded part is very complicated are caused by applying the adhesive. In addition, the mode of simultaneously drilling holes at the inner thread and the outer thread is adopted, the precision requirement on the position of the holes is extremely strict, the potential safety hazard also exists in the process of drilling in place without disassembly after charging, and the interchangeability between parts is also poor.
Therefore, how to play a good anti-loosening function on the threaded connection is a technical problem to be solved by those skilled in the art at present.
SUMMERY OF THE UTILITY MODEL
The application provides threaded connection's anti loosening structure to play good locking effect to threaded connection.
In order to solve the technical problem, the application provides the following technical scheme:
a loosening prevention structure for threaded connections, comprising: the combustion chamber comprises a combustion chamber shell, a locking screw and a spray pipe shell;
the connecting section of the combustion chamber shell is provided with internal threads, the connecting section of the spray pipe shell is provided with external threads, the connecting section of the spray pipe shell extends into the connecting section of the combustion chamber shell, and the external threads of the connecting section of the spray pipe shell are in threaded connection with the internal threads of the connecting section of the combustion chamber shell; the connecting section of the combustion chamber shell is provided with an anti-loosening threaded hole which penetrates through the inside and the outside, and the anti-loosening threaded hole penetrates through the internal thread of the connecting section of the combustion chamber shell; the anti-loosening screw is screwed into the anti-loosening threaded hole, and the threaded end of the anti-loosening screw is propped against the external thread of the connecting section of the spray pipe shell.
The anti-loosening structure of the threaded connection as described above, wherein it is preferable that the anti-loosening threaded hole penetrates the connection section of the combustor casing in the radial direction.
The anti-loosening structure for threaded connection as described above, wherein an adhesive is preferably applied between the anti-loosening screw and the anti-loosening threaded hole.
The anti-loosening structure of the threaded connection is characterized in that the connection section of the nozzle shell is provided with a sealing groove which is concave from outside to inside, the sealing groove is close to the inner side of the combustion chamber, and the external thread of the connection section of the nozzle shell is close to the outer side of the combustion chamber; a sealing ring is arranged in the sealing groove to seal a gap between the connecting section of the spray pipe shell and the connecting section of the combustion chamber shell.
In the anti-loosening structure for threaded connection, preferably, the sealing groove is an annular sealing groove, and the sealing ring is an O-ring.
A loosening prevention structure for threaded connections, comprising: the combustion chamber comprises a combustion chamber shell, a locking screw and a spray pipe shell; the connecting section of the combustion chamber shell is provided with external threads, the connecting section of the spray pipe shell is provided with internal threads, the connecting section of the combustion chamber shell extends into the connecting section of the spray pipe shell, and the external threads of the connecting section of the combustion chamber shell are in threaded connection with the internal threads of the connecting section of the spray pipe shell; the connecting section of the spray pipe shell is provided with an anti-loosening threaded hole which penetrates through the inside and the outside, and the anti-loosening threaded hole penetrates through the internal thread of the connecting section of the spray pipe shell; the anti-loosening screw is screwed into the anti-loosening threaded hole, and the threaded end of the anti-loosening screw is propped against the external thread of the connecting section of the combustion chamber shell.
The anti-loosening structure of the threaded connection is as described above, wherein preferably, the anti-loosening threaded hole penetrates through the connecting section of the nozzle housing in the radial direction.
The anti-loosening structure for threaded connection as described above, wherein an adhesive is preferably applied between the anti-loosening screw and the anti-loosening threaded hole.
The anti-loosening structure of the threaded connection is characterized in that the connection section of the combustion chamber shell is provided with a sealing groove which is concave from outside to inside, the sealing groove is close to the inner side of the combustion chamber, and the external thread of the connection section of the combustion chamber shell is close to the outer side of the combustion chamber; a sealing ring is arranged in the sealing groove to seal a gap between the connecting section of the combustion chamber shell and the connecting section of the spray pipe shell.
In the anti-loosening structure for threaded connection, preferably, the sealing groove is an annular sealing groove, and the sealing ring is an O-ring.
Has the beneficial effects that:
this application compresses tightly the thread inclined plane of external screw thread through the mode of the radial check screw of installation, has prevented spray tube casing and combustion chamber casing along axial pivoted relative rotation to still avoided the large tracts of land to paint the bonding agent, reduced assembly work load by a wide margin, and keep the job site clean, avoided the problem that is difficult to disassemble after the installation simultaneously.
According to the method, only the anti-loosening threaded hole is formed in the spray pipe shell or the combustion chamber shell, and the anti-loosening screw is arranged in the anti-loosening threaded hole and tightly presses the thread inclined surface of the external thread of the combustion chamber shell or the spray pipe shell, so that the problem that the two threaded holes are simultaneously formed, the anti-loosening screw penetrates through the two bodies and must be matched with a drill is solved, and the final assembly workload is reduced; the operation safety problem of the general assembly drill after charging is avoided; and the problems of installation error and product interchangeability caused by firstly arranging and punching and then installing are also solved.
This application adopts to arrange sealed face earlier near combustion chamber department along the axial, arranges threaded connection structure keeping away from combustion chamber department to make and bore locking screw hole on combustion chamber casing or spray tube casing can not have any influence to sealed.
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, it is obvious that the drawings in the description below are only some embodiments described in the present invention, and other drawings can be obtained by those skilled in the art according to the drawings.
Fig. 1 is a cross-sectional view of a locking structure of a threaded connection provided in an embodiment of the present application.
The fuel injection nozzle comprises a combustion chamber shell 110, a locking threaded hole 111, a locking screw 120, a nozzle shell 130, a sealing groove 131 and a sealing ring 140.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below by referring to the drawings are exemplary only for explaining the present invention, and should not be construed as limiting the present invention.
Referring to fig. 1, fig. 1 is a cross-sectional view of a locking structure of a threaded connection according to an embodiment of the present disclosure.
The application provides threaded connection's anti loosening structure includes: a combustion chamber housing 110, a jam screw 120, and a nozzle housing 130. The combustion chamber housing 110 and the nozzle housing 130 serve as pressure-bearing members of the solid rocket engine, and are connected by threads.
As an example, the connection section of combustor casing 110 has an internal thread, the connection section of nozzle casing 130 has an external thread, the connection section of nozzle casing 130 extends into the connection section of combustor casing 110, and the external thread of the connection section of nozzle casing 130 is threadedly connected with the internal thread of the connection section of combustor casing 110. A locking threaded hole 111 penetrating through the inside and the outside is formed at the connection section of the combustion chamber housing 110, and the locking threaded hole 111 also penetrates through the internal thread of the connection section of the combustion chamber housing 110 to ensure that the threaded end of the locking screw 120 can be jacked to the external thread of the connection section of the nozzle housing 130. Since the connection section of the combustor casing 110 and the connection section of the nozzle casing 130 are both cylindrical in shape, the loosening prevention threaded hole 111 in the present application penetrates the connection section of the combustor casing 110 in the radial direction.
The locking screw 120 is screwed into the locking threaded hole 111, and its threaded end is pressed against the external thread of the connection section of the nozzle case 130, so that the external thread of the connection section of the nozzle case 130 can be pressed. In order to make the threaded connection between the lock screw 120 and the lock threaded hole 111 firmer, an adhesive is also applied between the lock screw 120 and the lock threaded hole 111. Optionally, an adhesive is applied to the surface of the locking screw 120. Still alternatively, an adhesive is applied to the inside of the loosening-preventing threaded hole 111. More optionally, an adhesive is applied to both the surface of the locking screw 120 and the locking threaded hole 111.
On the basis, the connecting section of the nozzle shell 130 is provided with a sealing groove 131 which is concave from outside to inside, the sealing groove 131 is close to the inner side of the combustion chamber, and the external thread of the connecting section of the nozzle shell 130 is close to the outer side of the combustion chamber; a sealing ring 140 is provided in the sealing groove 131 to seal a gap between the connection section of the nozzle housing 130 and the connection section of the combustion chamber housing 110. Optionally, the sealing groove 131 is an annular sealing groove, and the sealing ring 140 is an O-ring. Optionally, the O-ring is an O-ring made of silicone rubber. Therefore, along the axial direction of the solid rocket engine, the combustion gas firstly enters the gap between the connection section of the nozzle casing 130 and the connection section of the combustion chamber casing 110, and plays a role of hermetically sealing the combustion chamber internal combustion through the sealing ring 140, so that the combustion gas is prevented from flowing to the outside of the solid rocket engine along the threaded connection part of the connection section of the combustion chamber casing 110 and the connection section of the nozzle casing 130, and the threaded connection part of the connection section of the combustion chamber casing 110 and the connection section of the nozzle casing 130 is not directly contacted with the combustion gas.
As a further example (not shown in the figures), the connection section of the combustion chamber housing has an external thread, the connection section of the lance housing has an internal thread, the connection section of the combustion chamber housing projects into the connection section of the lance housing, and the external thread of the connection section of the combustion chamber housing is screwed to the internal thread of the connection section of the lance housing. And the connecting section of the spray pipe shell is provided with an internal and external anti-loosening threaded hole, and the anti-loosening threaded hole also penetrates through the internal thread of the connecting section of the spray pipe shell so as to ensure that the threaded end of the anti-loosening screw can be jacked to the external thread of the connecting section of the combustion chamber shell. Because the connecting segment of spray tube casing and the connecting segment of combustion chamber casing's shape is cylindric, consequently locking screw hole in this application is along radially link up spray tube casing's connecting segment department.
The check screw is screwed into the check threaded hole, and the threaded end of the check screw is propped against the external thread of the connecting section of the combustion chamber shell, so that the external thread of the connecting section of the combustion chamber shell can be compressed. In order to ensure that the threaded connection between the locking screw and the locking threaded hole is firmer, a bonding agent is also coated between the locking screw and the locking threaded hole. Optionally, an adhesive is coated on the surface of the check screw. Optionally, an adhesive is applied to the threaded anti-loosening hole. More optionally, an adhesive is coated on the surface of the locking screw and in the locking threaded hole.
On the basis, the connecting section of the combustion chamber shell is provided with a sealing groove which is concave from outside to inside, the sealing groove is close to the inner side of the combustion chamber, and the external thread of the connecting section of the combustion chamber shell is close to the outer side of the combustion chamber; a sealing ring is arranged in the sealing groove to seal a gap between the connecting section of the combustion chamber shell and the connecting section of the spray pipe shell. Optionally, the sealing groove is an annular sealing groove, and the sealing ring is an O-shaped sealing ring. Optionally, the O-ring is an O-ring made of silicone rubber. Therefore, along the axial direction of the solid rocket engine, the gas can firstly enter a gap between the connecting section of the combustion chamber shell and the connecting section of the spray pipe shell, the sealing ring plays a role of hermetically sealing the gas in the combustion chamber, the gas is prevented from flowing to the outer side of the solid rocket engine along the threaded connection part of the connecting section of the spray pipe shell and the connecting section of the combustion chamber shell, and the threaded connection part of the connecting section of the spray pipe shell and the connecting section of the combustion chamber shell is not directly contacted with the gas.
When the solid rocket engine is installed, the sealing ring is installed in the sealing groove, then the connecting section of the spray pipe shell and the connecting section of the combustion chamber shell are in threaded connection with the mounting position in an aligning mode, after the anti-loosening screw is coated with the adhesive, the anti-loosening screw is screwed into the anti-loosening threaded hole until the threaded end of the anti-loosening screw is tightly pressed to the external thread. The combustion chamber shell or the spray pipe shell can cause the trend that the threaded connection part rotates in the opposite direction of pre-tightening under the environmental conditions of transportation, vibration and the like, and the anti-loosening screw is tightly pressed on the inclined plane of the thread of the external thread, so that the spray pipe shell and the combustion chamber shell are prevented from rotating along the axial direction, and the anti-loosening effect is achieved, the problem that the bonding agent is difficult to disassemble after being coated in a large area is avoided, and the problems of complex process and poor interchangeability caused by simultaneous drilling of the internal thread and the external thread are also avoided.
It is obvious to a person skilled in the art that the invention is not restricted to details of the above-described exemplary embodiments, but that it can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (5)
1. A check structure of a threaded connection, comprising: the combustion chamber comprises a combustion chamber shell, a locking screw and a spray pipe shell;
the connecting section of the combustion chamber shell is provided with internal threads, the connecting section of the spray pipe shell is provided with external threads, the connecting section of the spray pipe shell extends into the connecting section of the combustion chamber shell, and the external threads of the connecting section of the spray pipe shell are in threaded connection with the internal threads of the connecting section of the combustion chamber shell;
the connecting section of the combustion chamber shell is provided with an anti-loosening threaded hole which penetrates through the inside and the outside, and the anti-loosening threaded hole penetrates through the internal thread of the connecting section of the combustion chamber shell;
the anti-loosening screw is screwed into the anti-loosening threaded hole, and the threaded end of the anti-loosening screw is propped against the external thread of the connecting section of the spray pipe shell.
2. The threaded connection loosening prevention structure of claim 1, wherein a loosening prevention threaded hole radially penetrates the connection section of the combustor casing.
3. The anti-loosening structure for threaded connection according to claim 1 or 2, wherein an adhesive is applied between the anti-loosening screw and the anti-loosening threaded hole.
4. The anti-loosening structure for threaded connection according to claim 1 or 2, wherein the connection section of the nozzle casing is provided with a sealing groove which is concave from outside to inside, and the sealing groove is close to the inner side of the combustion chamber, and the external thread of the connection section of the nozzle casing is close to the outer side of the combustion chamber;
a sealing ring is arranged in the sealing groove to seal a gap between the connecting section of the spray pipe shell and the connecting section of the combustion chamber shell.
5. The anti-loosening structure for threaded connection according to claim 4, wherein the sealing groove is an annular sealing groove, and the sealing ring is an O-shaped sealing ring.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222434150.6U CN218093761U (en) | 2022-09-14 | 2022-09-14 | Anti-loosening structure for threaded connection |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222434150.6U CN218093761U (en) | 2022-09-14 | 2022-09-14 | Anti-loosening structure for threaded connection |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN218093761U true CN218093761U (en) | 2022-12-20 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202222434150.6U Active CN218093761U (en) | 2022-09-14 | 2022-09-14 | Anti-loosening structure for threaded connection |
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| Country | Link |
|---|---|
| CN (1) | CN218093761U (en) |
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- 2022-09-14 CN CN202222434150.6U patent/CN218093761U/en active Active
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