Lubricating sliding sealing structure

Abstract

The invention relates to an oil-lubricated sliding sealing structure, which belongs to the field of aerospace equipment and comprises an end cover, an actuating rod, a first movable sealing ring, a second movable sealing ring, a plug and a sealing ring. The end cover comprises a first sealing groove, a second sealing groove, an oil groove and an oil injection port; the actuating rod penetrates through a through hole of the end cover and forms a movable sealing pair with the first movable sealing ring and the second movable sealing ring, the plug is installed at the oil injection port, the sealing rings are arranged for sealing, so that the oil groove forms a closed cavity, and the oil groove is filled with lubricating oil or lubricating grease. Lubricating oil or lubricating grease in the oil groove provides a lubricating environment for the dynamic sealing pair, and the dynamic sealing structure which is small in size, lubricated through oil and convenient for sealing performance testing is achieved.

Description

Technical Field

[0001] The invention belongs to the field of aerospace equipment, and in particular relates to an oil-lubricated dynamic sealing structure. Background Art

[0002] Electromechanical servo products are increasingly used in underwater weaponry, ships, submarines, underwater vehicles and other fields. Their special application scenarios place high demands on the waterproof and sealing properties of servo products.

[0003] Utility model patent CN203384370U is an underwater dynamic sealing device, the dynamic sealing structure is in the form of dry friction, without lubrication design, easy to produce wear and affect the sealing effect, and difficult to perform sealing detection;

[0004] National invention patent ZL200610156882.6 dynamic sealing device, the dynamic sealing structure is a dry friction form, without lubrication design, and the structure is complex and large in size, which is difficult to meet the needs of underwater servo products with extremely limited space, and it is difficult to perform sealing detection. Summary of the invention

[0005] The purpose of the present invention is to overcome the above-mentioned defects of the prior art and provide an oil-lubricated dynamic sealing structure. By setting two sealing pairs, a closed cavity is formed at the dynamic seal, and lubricating oil or grease is filled in the closed cavity to realize an oil-lubricated dynamic sealing structure, thereby realizing a dynamic sealing structure with small size, oil lubrication and convenient sealing testing.

[0006] The above-mentioned purpose of the present invention is mainly achieved through the following technical solutions:

[0007] An oil-lubricated dynamic sealing structure comprises an end cover, an actuating rod, a first dynamic sealing ring, a second dynamic sealing ring and a plug, wherein the end cover comprises a first sealing groove, a second sealing groove, an oil groove and an oil filling port; the oil filling port is arranged on the oil groove, the first dynamic sealing ring is arranged in the first sealing groove, the second dynamic sealing ring is arranged in the second sealing groove, the actuating rod passes through the through hole of the end cover, and the plug is arranged at the oil filling port, so that the oil groove forms a closed cavity, and lubricant is injected into the oil groove through the oil filling port.

[0008] The connection between the plug and the end cover is threaded.

[0009] It also includes a sealing ring, which is arranged between the plug and the end cover.

[0010] The lubricant is lubricating oil or lubricating grease.

[0011] The inner rings of the first dynamic sealing ring and the second dynamic sealing ring are tightly matched with the actuating rod, the outer ring of the first dynamic sealing ring is tightly matched with the bottom of the first sealing groove, and the outer ring of the second dynamic sealing ring is tightly matched with the bottom of the second sealing groove.

[0012] The first dynamic sealing ring and the second dynamic sealing ring are both sealing rings that can withstand bidirectional pressure.

[0013] It also includes a testing tool. After the oil-lubricated dynamic seal structure is assembled, a testing tool is set at the oil filling port to perform oil pressure testing or air pressure testing to check the sealing performance of the dynamic seal.

[0014] The detection tool is threadedly connected to the end cover.

[0015] The oil filling port side of the end cover is a water environment, and the other side is a moving inner cavity.

[0016] Compared with the prior art, the present invention has at least the following beneficial effects:

[0017] (1) The present invention adopts local oil lubrication to improve the working reliability of the dynamic seal.

[0018] (2) The present invention can realize the local sealing inspection of the dynamic seal to ensure the effective installation of the seal. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a cross-sectional view of the oil-lubricated dynamic seal structure of the present invention;

[0020] Figure 2 This is a cross-sectional view of the end cover of the oil-lubricated dynamic seal structure of the present invention;

[0021] Figure 3 It is a schematic diagram of the end cover of the oil-lubricated dynamic seal structure of the present invention. DETAILED DESCRIPTION

[0022] The present invention is further described in detail below with reference to the accompanying drawings and specific embodiments:

[0023] like Figure 1 FIG. 1 is a cross-sectional view of an oil-lubricated dynamic seal structure of the present invention, wherein the oil-lubricated dynamic seal structure comprises an end cover 1, an actuating rod 2, a first dynamic seal ring 3, a second dynamic seal ring 4, a plug 5 and a seal ring 6; Figure 2 The figure shows a cross-sectional view of the end cover of the oil-lubricated dynamic seal structure of the present invention. Figure 3The figure shows a schematic diagram of the end cover of the oil-lubricated dynamic seal structure of the present invention; the end cover 1 includes a first sealing groove 101, a second sealing groove 102, an oil groove 103 and an oil filling port 104; a first dynamic seal ring 3 is arranged in the first sealing groove 101 of the end cover 1, and a second dynamic seal ring 4 is arranged in the second sealing groove 102; the actuating rod 2 passes through the through hole of the end cover 1, and forms a dynamic seal pair with the first dynamic seal ring 3 and the second dynamic seal ring 4; the plug 5 is installed at the oil filling port 104 of the end cover 1, and the installation method is a threaded connection; a sealing ring 6 is arranged between the plug 5 and the end cover 1 for sealing, so that the oil groove 103 forms a closed cavity; the oil groove 103 is filled with lubricating oil or grease through the oil filling port 104; the end cover 1 is a fixed body, and when the actuating rod 2 reciprocates linearly relative to the end cover 1, the lubricating oil or grease in the oil groove provides a lubricating environment for the dynamic seal pair.

[0024] The inner rings of the first dynamic sealing ring 3 and the second dynamic sealing ring 4 are tightly matched with the actuating rod 2, the first dynamic sealing ring 3 is tightly matched with the bottom of the first sealing groove 101 of the end cover 1, and the second dynamic sealing ring 4 is tightly matched with the bottom of the second sealing groove 102 of the end cover 1;

[0025] A detection fixture with threads that can be installed on the oil filling port is provided to perform oil pressure detection or air pressure detection on the assembled oil-lubricated sealing structure to check the sealing performance of the dynamic seal.

[0026] The first dynamic sealing ring 3 must be a sealing ring that can withstand bidirectional pressure, and the second dynamic sealing ring 4 can be a sealing ring that can withstand bidirectional pressure or a sealing ring that can withstand unidirectional pressure, but attention must be paid to the direction of pressure and it cannot be installed in the reverse direction.

[0027] The above description is only the best specific implementation mode of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by any technician familiar with the technical field within the technical scope disclosed by the present invention should be covered within the protection scope of the present invention.

[0028] The contents not described in detail in the specification of the present invention belong to the common knowledge of the professionals in this field.

Claims

1. An oil-lubricated dynamic seal structure, characterized in that: The invention comprises an end cover (1), an actuating rod (2), a first dynamic sealing ring (3), a second dynamic sealing ring (4) and a plug (5); the end cover (1) comprises a first sealing groove (101), a second sealing groove (102), an oil groove (103) and an oil filling port (104); the oil filling port (104) is arranged on the oil groove (103), the first dynamic sealing ring (3) is arranged in the first sealing groove (101), the second dynamic sealing ring (4) is arranged in the second sealing groove (102), the actuating rod (2) passes through a through hole of the end cover (1), and the plug (5) is arranged at the oil filling port (104), so that the oil groove (103) forms a closed cavity, and lubricant is injected into the oil groove (103) through the oil filling port (104).

2. The oil-lubricated dynamic seal structure according to claim 1, characterized in that: The plug (5) and the end cover (1) are connected in a threaded manner.

3. The oil-lubricated dynamic seal structure according to claim 1, characterized in that: It also includes a sealing ring (6), which is arranged between the plug (5) and the end cover (1).

4. The oil-lubricated dynamic seal structure according to claim 1, characterized in that: The lubricant is lubricating oil or lubricating grease.

5. The oil-lubricated dynamic seal structure according to claim 1, characterized in that: The inner rings of the first dynamic sealing ring (3) and the second dynamic sealing ring (4) are tightly fitted with the actuating rod (2), the outer ring of the first dynamic sealing ring (3) is tightly fitted with the bottom of the first sealing groove (101), and the outer ring of the second dynamic sealing ring (4) is tightly fitted with the bottom of the second sealing groove (102).

6. The oil-lubricated dynamic seal structure according to claim 1, characterized in that: The first dynamic sealing ring (3) and the second dynamic sealing ring (4) are both sealing rings that can withstand bidirectional pressure.

7. The oil-lubricated dynamic seal structure according to claim 1, characterized in that: It also includes a testing tool. After the oil-lubricated dynamic seal structure is assembled, a testing tool is arranged at the oil filling port (104) to perform oil pressure testing or air pressure testing to check the sealing performance of the dynamic seal.

8. The oil-lubricated dynamic seal structure according to claim 7, characterized in that: The detection tool is threadedly connected to the end cover (1).

9. The oil-lubricated dynamic seal structure according to claim 1, characterized in that: The oil filling port (104) side of the end cover (1) is a water environment, and the other side is a movement inner cavity.

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