Split type sealing end cover of outer cylinder for aviation hydraulic equipment

By adopting a split sealing end cap structure in aviation hydraulic equipment, the problem of difficult assembly and short service life of the seal ring under the size of the inner diameter of the larger outer cylinder is solved, and more efficient sealing performance and longer service life are achieved.

CN119641904APending Publication Date: 2025-03-18SICHUAN LINGFENG AVIATION HYDRAULIC MACHINERY
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Patent Information

Application Number
CN202411892957.1
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-12-20
Publication Date
2025-03-18

AI Technical Summary

Technical Problem

In the case of a larger outer cylinder inner diameter (≥50mm), the integrated end cap sealing structure of existing hydraulic equipment leads to difficult assembly of seal rings, difficult damage to detect, and short service time, resulting in seal failure and working medium leakage.

Method used

A split sealed end cap structure is adopted, including an upper end cap, a lower end cap, a seal and an end nut. A communication pipe and a nozzle are arranged in the middle of the lower end cap. The upper end cap is threadedly connected to the end of the outer cylinder, and a sealing connection with the outer cylinder is achieved through a sealing groove and a sealing member.

Benefits of technology

Avoid wear, cracking and twisting deformation caused by rotation of the seal during assembly, extends the service life of the seal, simplifies the assembly process and improves the reliability of the seal.

✦ Generated by Eureka AI based on patent content.

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    Figure CN119641904A_ABST
Patent Text Reader

Abstract

The split type sealing end cover of the outer cylinder for the aviation hydraulic equipment comprises an upper end cover, a lower end cover, a sealing piece and an end face nut, a communicating pipe is arranged in the middle of the lower end cover, and the free end of the communicating pipe penetrates through the upper end cover and is in threaded connection with the end face nut; a sealing groove is formed in the peripheral side of the lower end cover, and the sealing piece is installed in the sealing groove in a sleeved mode. The upper end cover with the lower end cover extends into the outer cylinder, the upper end cover is in threaded connection with the end of the outer cylinder, external threads are correspondingly arranged on the peripheral side of the upper end cover, and the diameter of the central through hole is larger than or equal to the outer diameter of the communicating pipe. When the upper end cover is assembled to the outer cylinder, the lower end cover does not rotate, so that the problem of working medium leakage caused by abrasion, cracking and distortion deformation damage of a sealing piece is avoided, the installation service life of a product is prolonged, the maintenance-free time of the sealing piece is long, and in addition, the sealing piece is simple in structure, easy to machine and manufacture, convenient to install and good in practicability.
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Description

Technical Field

[0001] The invention belongs to the technical field of hydraulic seals of aviation equipment, and in particular relates to a split sealing end cover of an outer cylinder for aviation hydraulic equipment. Background Art

[0002] In the prior art, the seal between the outer cylinder and the end cover of aviation hydraulic accessory products such as hydraulic actuators, pneumatic actuators and accumulators is usually sealed by opening a sealing groove on the outer diameter of the integral end cover and then using a sealing ring structure. This integral end cover sealing structure has a good sealing effect when the inner diameter of the outer cylinder is small, but in the specific case of a large inner diameter of the outer cylinder, especially when the inner diameter of the outer cylinder is ≥50mm, there are the following problems:

[0003] ① Difficulty in assembly at the production site: Because the sealing ring has a certain amount of compression, when the end cover is installed into the outer cylinder, it is necessary to rotate and tighten the threaded engagement connection between the end cover and the outer cylinder. During the tightening process of the end cover, the sealing ring and the inner wall of the outer cylinder and the sealing ring and the sealing groove of the end cover squeeze and rub against each other, which can easily cause the sealing ring to be distorted or even cut;

[0004] ② It is difficult to detect damage to the sealing ring: When the wear and cracking of the sealing ring is not serious, the sealing test in the factory will generally not temporarily show any leakage or other sealing failure phenomena, making it impossible to determine whether there is any sealing ring damage;

[0005] ③ The sealing ring has a short service life: After the product is installed, as the number of reciprocating movements of the piston increases, there is a problem that the sealing ring is often squeezed, resulting in failure of the end cover seal, and the working medium seeps out, causing the product to fail to work normally. Summary of the invention

[0006] The object of the present invention is to provide a split sealing end cover for an outer cylinder of aviation hydraulic equipment, aiming to solve the above-mentioned problems.

[0007] The present invention is mainly achieved through the following technical solutions:

[0008] A split sealing end cover for an outer cylinder of an aviation hydraulic equipment comprises an upper end cover, a lower end cover, a sealing member and an end face nut, a connecting pipe is arranged in the middle of the lower end cover, and a nozzle is arranged at the end of the connecting pipe; the free end of the connecting pipe passes through the upper end cover and is threadedly connected with the end face nut, a connecting thread is arranged on the outer side of the connecting pipe, and a central through hole is arranged in the middle of the upper end cover; a sealing groove is arranged on the peripheral side of the lower end cover, the sealing member is sleeved and installed in the sealing groove, and the lower end cover is sealed and connected to the inner part of the outer cylinder through the sealing member; the upper end cover extends into the inner part of the outer cylinder with the lower end cover, and the upper end cover is threadedly connected to the end of the outer cylinder, the peripheral side of the upper end cover is arranged with an external thread, and the diameter of the central through hole is greater than or equal to the outer diameter of the connecting pipe. Specifically, a connected oil inlet hole is arranged in the middle of the nozzle.

[0009] In order to better implement the present invention, further, the circumferential side of the upper end cover is provided with external threads and a receiving end surface in sequence from left to right.

[0010] In order to better realize the present invention, further, the upper end cover includes a main body of a T-shaped structure, and a threaded ring and a receiving ring seat are sequentially sleeved on the connecting shaft of the main body from left to right, an external thread is arranged on the outer side of the threaded ring, and a receiving end face is arranged on the side of the receiving ring seat close to the end of the outer cylinder.

[0011] In order to better implement the present invention, further, the receiving end surface is connected to the end of the outer tube through a locking washer, and the diameter of the receiving end surface is larger than the inner diameter of the end of the outer tube.

[0012] In order to better implement the present invention, further, a plurality of locking screws are arranged on the peripheral side of the end of the outer cylinder, and one end of the locking screw passes through the end of the outer cylinder and is connected to the upper end cover.

[0013] In order to better implement the present invention, further, a hexagonal boss for tightening with a wrench is provided on the outer end face of the upper end cover, and the free end of the connecting pipe passes through the upper end cover and the hexagonal boss in sequence and is threadedly connected to the end face nut.

[0014] In order to better implement the present invention, further, the left end surface of the lower end cover is respectively provided with a weight-reducing hole; the right end surface of the upper end cover is provided with a weight-reducing hole or an end cover fixing installation hole.

[0015] In order to better realize the present invention, further, the sealing member includes a sealing ring, and the sealing ring is any one of O-shaped, T-shaped, V-shaped, D-shaped, X-shaped, H-shaped, Y-shaped, U-shaped, J-shaped, L-shaped, △-shaped, and square; the sealing groove corresponds to any one of a V-shaped groove, a rectangular groove, a semicircular groove, a triangular groove, and a trapezoidal groove.

[0016] In order to better implement the present invention, further, the sealing member also includes a protection ring, and protection rings are respectively arranged on both sides of the sealing ring.

[0017] The beneficial effects of the present invention are as follows:

[0018] Compared with the traditional sealing structure, the present invention adopts a sealing structure in the form of a combination of an upper end cover and a lower end cover. The sealing groove is set on the outer diameter of the lower end cover. When the upper end cover is assembled to the outer cylinder, the lower end cover does not need to rotate, thereby avoiding the leakage of the working medium caused by the wear, cracking and distortion of the seal, extending the service life of the product installation, and the maintenance-free time of the seal is long. In addition, the present invention has a simple structure, is easy to process and manufacture, is easy to install, and has good practicality. Secondly, the present invention can flexibly adapt the threaded ring and the receiving ring seat according to the inner diameter of the end of the different outer cylinders through the detachable structure of the upper end cover, which increases the scope of use. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the exploded structure of the split sealing end cover of the outer cylinder for aviation hydraulic equipment of the present invention;

[0020] Figure 2 It is a structural schematic diagram of the upper end cover of the present invention;

[0021] Figure 3 It is a structural schematic diagram of the lower end cover of the present invention;

[0022] Figure 4 is a schematic diagram of the connection structure between the upper end cover and the lower end cover in Example 1;

[0023] Figure 5 is a schematic diagram of the connection structure between the upper end cover and the lower end cover in Example 3;

[0024] Figure 6 is a schematic diagram of the connection structure between the upper end cover and the lower end cover in Example 4;

[0025] Figure 7 is a schematic diagram of the connection structure between the split sealing end cover and the first cylinder in Example 2;

[0026] Figure 8 is a schematic diagram of the connection structure between the split sealing end cover and the second cylinder in Example 3;

[0027] Fig. 9 It is a schematic diagram of the connection structure between the split sealing end cover and the third cylinder in Example 4.

[0028] In the figure: 1-end face nut, 2-upper end cover, 201-external thread, 202-retracting groove, 203-hexagonal boss, 204-center through hole, 3-lower end cover, 301-sealing groove, 302-connecting thread, 303-nozzle, 304-oil / air inlet, 4-sealing member, 5-first cylinder, 6-protection ring, 7-T-shaped sealing ring, 8-locking washer, 9-second cylinder, 10-third cylinder, 11-locking screw. DETAILED DESCRIPTION

[0029] Embodiment 1:

[0030] A split sealing end cover for an outer cylinder of an aviation hydraulic device, such as Figure 1-Figure 4 As shown, it includes: an end nut 1, an upper end cover 2, a lower end cover 3 and a sealing member 4.

[0031] like Figure 2 As shown, the upper end cover 2 is a cylindrical structure rotationally symmetrical about the central through hole 204, and the circumferential side of the upper end cover 2 is provided with an external thread 201 and a thread-machined back-off groove 202, and the outer end face of the upper end cover 2 is provided with a hexagonal boss 203 for tightening with a wrench.

[0032] like Figure 3 As shown, the lower end cover 3 is a T-shaped structure end cover symmetrical about the central axis, and the middle part is a connected structure. A connecting thread 302 is provided on the outer shaft body of the lower end cover 3, and a nozzle 303 is provided at the end of the outer shaft body. The middle part of the nozzle 303 is connected with an oil / gas inlet 304. A sealing groove 301 is provided on the peripheral side of the lower end cover 3, and a sealing member 4 is provided in the sealing groove 301. The sealing section of the lower end cover 3 is provided with a sealing groove 301 and is assembled in the outer cylinder together with the sealing member 4.

[0033] The end face nut 1 is a hexagonal nut, and its thread direction and pitch are consistent with the thread direction and pitch of the corresponding connecting thread 302 on the lower end cover 3. Figure 4 As shown, the upper end cover 2 and the lower end cover 3 are fastened together by the end face nut 1 and the connecting thread 302 to form an integral structure.

[0034] Preferably, the seal 4 includes a seal ring and a protection ring 6. The cross section of the seal ring is one of O-shaped, T-shaped, V-shaped, D-shaped, X-shaped, H-shaped, Y-shaped, U-shaped, J-shaped, L-shaped, △-shaped or square. The seal groove 301 is one of a V-shaped groove, a rectangular groove, a semicircular groove, a triangular groove or a trapezoidal groove. The seal groove 301 is combined with the corresponding seal 4, and 2 / 3 of the cross section of the seal ring is in the seal groove 301. Specifically, the seal 4 is made of rubber or nylon material.

[0035] During use of the present invention, the upper end cover 2 and the lower end cover 3 are first pre-installed, and then the whole is installed inside the outer cylinder. At this time, the lower end cover 3 is located inside the outer cylinder, and the lower end cover 3 is sealed and connected to the inner part of the outer cylinder through the seal 4. The upper end cover 2 is located at the end of the outer cylinder, and the upper end cover 2 is rotated to be threadedly fixed on the end of the outer cylinder. During this process, the lower end cover 3 does not rotate with the upper end cover 2, and finally the end face nut 1 is tightened to fasten the upper end cover 2 and the lower end cover 3. Compared with the traditional sealing structure, the present invention adopts a sealing structure in the form of a combination of the upper end cover 2 and the lower end cover 3. The sealing groove 301 is set on the outer diameter of the lower end cover 3. When the upper end cover 2 is assembled to the outer cylinder, the lower end cover 3 does not need to rotate, thereby avoiding the leakage of the working medium caused by the wear, cracking and distortion of the seal 4, extending the installed service life of the product, and the seal 4 has a long maintenance-free time. In addition, the present invention has a simple structure, is easy to process and manufacture, and is easy to install.

[0036] Embodiment 2:

[0037] A split sealing end cover for an outer cylinder of an aviation hydraulic device, such as Figure 1 As shown, it includes: an end nut 1, an upper end cover 2, a lower end cover 3 and a sealing member 4.

[0038] like Figure 2 As shown, the middle of the upper end cover 2 is a central through hole 204, and the peripheral side is provided with an external thread 201, and the outer end surface of the upper end cover 2 is provided with a hexagonal boss 203 used for tightening with a wrench.

[0039] like Figure 3 As shown, the middle part of the lower end cover 3 is a connecting pipe, a connecting thread 302 is provided on the outer shaft of the connecting pipe, and a nozzle 303 is provided at the end of the connecting pipe, and the middle part of the nozzle 303 is connected to an oil / gas inlet 304. A sealing groove 301 is provided on the peripheral side of the lower end cover 3, and a sealing member 4 is provided in the sealing groove 301.

[0040] like Figure 7 As shown, the inner diameter of the central through hole 204 is larger than the outer diameter of the connecting thread 302 on the connecting pipe, and the peripheral end surface of the upper end cover 2 is provided with an external thread 201 corresponding to the first cylinder 5, and the peripheral side of the lower end cover 3 is designed with a sealing groove 301, and the sealing groove 301 and the O-ring are assembled in the first cylinder 5. The connecting pipe is inserted into the central through hole 204 of the upper end cover 2 and threadedly connected with the end face nut 1, so that the two fitting surfaces are pressed tightly to obtain the upper end cover 2 and the lower end cover 3 assembly. When the assembly is completed, the internal thread of the first cylinder 5 is threadedly connected with the external thread 201 of the upper end cover 2.

[0041] Embodiment 3:

[0042] A split sealing end cover for an outer cylinder of an aviation hydraulic device, such as Figure 1As shown, it includes: an end nut 1, an upper end cover 2, a lower end cover 3 and a sealing member 4.

[0043] like Figure 5 As shown, the middle of the upper end cover 2 is a central through hole 204, and the peripheral side is provided with an external thread 201 and a receiving end face, and the outer end face of the upper end cover 2 is provided with a hexagonal boss 203 for tightening with a wrench. A locking washer 8 is provided between the receiving end face and the end face of the outer cylinder to prevent loosening.

[0044] like Figure 3 As shown, the middle part of the lower end cover 3 is a connecting pipe, a connecting thread 302 is provided on the outer shaft of the connecting pipe, and a nozzle 303 is provided at the end of the connecting pipe, and the middle part of the nozzle 303 is connected to an oil / gas inlet 304. A sealing groove 301 is provided on the peripheral side of the lower end cover 3, and a sealing member 4 is provided in the sealing groove 301.

[0045] like Figure 8 As shown, a locking washer 8 is provided between the receiving end face and the end face of the second cylinder 9 to prevent loosening. A weight-reducing hole is added on the right end face of the upper end cover 2, and a weight-reducing hole is also added on the side of the lower end cover 3 facing the cavity to meet the lightweight design index of the aircraft design. Preferably, the sealing member 4 includes a T-shaped sealing ring 7 plus a protective ring 6 to adapt to more severe working conditions.

[0046] Embodiment 4:

[0047] A split sealing end cover for an outer cylinder of an aviation hydraulic device, such as Figure 1 As shown, it includes: an end nut 1, an upper end cover 2, a lower end cover 3 and a sealing member 4.

[0048] like Figure 6 As shown, the middle part of the upper end cover 2 is a central through hole 204, and the peripheral side is provided with an external thread 201. The middle part of the lower end cover 3 is a connecting pipe, and the outer shaft of the connecting pipe is provided with a connecting thread 302, and the end of the connecting pipe is provided with a nozzle 303, and the middle part of the nozzle 303 is connected with an oil / gas inlet 304. The peripheral side of the lower end cover 3 is provided with a sealing groove 301, and a sealing member 4 is provided in the sealing groove 301.

[0049] like Fig. 9As shown, the outer end face of the upper end cover 2 is provided with an end cover fixing installation hole, and the left end face of the lower end cover 3 is provided with a weight reduction hole; the end cover fixing installation hole plays a role of weight reduction on the one hand, and can also be used as a mounting hole for a wrench to apply torque when installing the end cover on the other hand. The weight reduction hole of the lower end cover 3 is adjusted to a stepped structure according to the conditions of use. The seal 4 adopts an O-ring + protective ring 6 combined sealing form to prevent the O-ring from being embedded in the gap between the sealing pair coupling parts due to elastic deformation after being subjected to pressure load. After the end cover is assembled, it is also necessary to set a locking hole for installing the locking screw 11 through the prefabricated hole of the third cylinder 10 to prevent relative rotation between the upper end cover 2 and the third cylinder 10.

[0050] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Any simple modification or equivalent change made to the above embodiment based on the technical essence of the present invention shall fall within the protection scope of the present invention.

Claims

1. A split sealing end cover for an outer cylinder of an aviation hydraulic equipment, characterized in that: The invention comprises an upper end cover (2), a lower end cover (3), a sealing member (4) and an end face nut (1); a connecting pipe is arranged in the middle of the lower end cover (3), and a nozzle (303) is arranged at the end of the connecting pipe; a free end of the connecting pipe passes through the upper end cover (2) and is threadedly connected to the end face nut (1); a connecting thread (302) is correspondingly arranged on the outer side of the connecting pipe; a central through hole (204) is correspondingly arranged in the middle of the upper end cover (2); and a nozzle (303) is arranged at the end of the connecting pipe. ) is provided with a sealing groove (301) on the circumferential side, the sealing member (4) is sleeved and installed in the sealing groove (301), and the lower end cover (3) is sealedly connected to the inner part of the outer tube through the sealing member (4); the upper end cover (2) extends into the inner part of the outer tube with the lower end cover (3), and the upper end cover (2) is threadedly connected to the end of the outer tube, and the circumferential side of the upper end cover (2) is correspondingly provided with an external thread (201), and the diameter of the central through hole (204) is greater than or equal to the outer diameter of the connecting pipe.

2. The split sealing end cover of the outer cylinder for aviation hydraulic equipment according to claim 1, characterized in that: The circumferential side of the upper end cover (2) is provided with external threads (201) and a receiving end surface in sequence from left to right.

3. The split sealing end cover of the outer cylinder for aviation hydraulic equipment according to claim 2, characterized in that: The upper end cover (2) comprises a main body of a T-shaped structure, on the connecting shaft of the main body a threaded ring and a receiving ring seat are sequentially sleeved from left to right, the outer side of the threaded ring is provided with an external thread (201), and the receiving ring seat is provided with a receiving end surface on a side close to the end of the outer cylinder.

4. A split sealing end cover for an outer cylinder of an aviation hydraulic equipment according to claim 2 or 3, characterized in that: The receiving end surface is connected to the end of the outer tube via a locking washer (8), and the diameter of the receiving end surface is larger than the inner diameter of the end of the outer tube.

5. The split sealing end cover of the outer cylinder for aviation hydraulic equipment according to claim 1, characterized in that: A plurality of locking screws (11) are arranged on the circumferential side of the end of the outer cylinder, and one end of the locking screw (11) passes through the end of the outer cylinder and is connected to the upper end cover (2).

6. The split sealing end cover of the outer cylinder for aviation hydraulic equipment according to claim 1, characterized in that: The outer end surface of the upper end cover (2) is provided with a hexagonal boss (203) for tightening with a wrench, and the free end of the connecting pipe passes through the upper end cover (2) and the hexagonal boss (203) in sequence and is threadedly connected to the end face nut (1).

7. The split sealing end cover of the outer cylinder for aviation hydraulic equipment according to claim 1, characterized in that: The left end surface of the lower end cover (3) is respectively provided with a weight-reducing hole; the right end surface of the upper end cover (2) is provided with a weight-reducing hole or an end cover fixing installation hole.

8. The split sealing end cover of the outer cylinder for aviation hydraulic equipment according to claim 1, characterized in that: The sealing member (4) comprises a sealing ring, and the sealing ring is any one of an O-shape, a T-shape, a V-shape, a D-shape, an X-shape, an H-shape, a Y-shape, a U-shape, a J-shape, an L-shape, a △-shape, and a square shape; the sealing groove (301) corresponds to any one of a V-shaped groove, a rectangular groove, a semicircular groove, a triangular groove, and a trapezoidal groove.

9. The split sealing end cover of the outer cylinder for aviation hydraulic equipment according to claim 8, characterized in that: The sealing member (4) further comprises a protective ring (6), and a protective ring (6) is respectively arranged on both sides of the sealing ring.