Combined sealing structure

Abstract

The combined sealing structure comprises an energy storage ring and a back ring, the energy storage ring is provided with a high-pressure face, an outer ring face, an inner ring face and an energy storage ring abutting face, the back ring comprises an outer ring face, an inner ring face and a back ring abutting face, the energy storage ring abutting face is matched with the back ring abutting face in an abutting mode, the diameter of the outer ring face is the same as that of the outer ring face, and the diameter of the inner ring face is the same as that of the inner ring face. The sealing structure has the advantages of being good in sealing effect, long in service life, simple in structure, convenient to install and the like, and has wide application prospects.

Description

TECHNICAL FIELD

[0001] The utility model relates to a sealing structure, specifically relates to a combined sealing structure. BACKGROUND

[0002] During the operation of the hydraulic drive compressor, the piston rod sealing ring is faced with severe working condition challenges. When in a high-pressure environment, the maximum sealing pressure difference can reach 45MPa, at which time the sealing ring is extremely easy to be extruded into the tiny gap between the installation parts, thereby causing the cold flow phenomenon, which has extremely adverse effects on the reliability of the sealing.

[0003] During work, due to the existence of such a high pressure difference and the friction force generated by the movement of the piston rod, the annular area of the outer circle (for the shaft sealing ring) or the inner hole (for the hole sealing ring) will bear a huge shearing force. This shearing force causes the molecular chain to slip, so that the sealing ring material is gradually extruded into the gap on the low-pressure side. Once this part of the sealing ring is separated from the stress area, under the continuous pressure, the area that was originally not stressed or less stressed will become a new annular area subjected to shearing force, and then the above-mentioned extrusion deformation process is repeated. This cycle continues, the sealing ring is continuously worn out, its sealing performance gradually decreases, until it finally completely fails and can no longer effectively seal, resulting in leakage and other failures of the hydraulic drive compressor, seriously affecting the normal operation and work efficiency of the equipment, and even possibly causing safety hazards.

[0004] In the prior art, for example, Chinese patent CN204610427U discloses a piston rod buffer sealing ring of a hydraulic oil cylinder, which comprises a flexible sealing ring body and a check ring. The flexible sealing ring body has an upper end face and a lower end face opposite to the upper end face, the lower end face is provided with an annular groove, the flexible sealing ring body located on one side of the annular groove close to the piston rod forms an inner lip portion in contact with the piston rod, the upper end face is provided with a recess on the inner side; the check ring is embedded in the recess. This technology has improved the sealing performance of the sealing ring to a certain extent, but the sealing performance is still not ideal, and the service life of the sealing ring has not been greatly improved, and the replaceability is not high for different sealing scenarios of the piston rod and the inner hole. UTILITY MODEL CONTENTS

[0005] The utility model provides a combined sealing structure, including energy storage ring, back ring, energy storage ring has high pressure surface, outer ring surface, inner ring surface, energy storage ring resistance surface, when sealing piston rod, inner ring surface is the contact surface with piston rod, or when sealing inner hole, outer ring surface and inner hole contact. Back ring includes outer ring surface and inner ring surface, back ring resistance surface, energy storage ring resistance surface and back ring resistance surface resist contact, outer ring surface and outer ring surface diameter are same, inner ring surface and inner ring face diameter are same.

[0006] The gasket is embedded in the energy storage ring, and the gap between the inner back ring and the outer back ring is blocked.

[0007] The outer back ring comprises an outer back ring outer ring surface, an outer back ring inner ring surface and an outer back ring abutting surface, the diameter of the outer back ring outer ring surface is the same as that of the outer ring surface, and the outer back ring abutting surface abuts against the gasket abutting surface and the energy storage ring abutting surface. The inner back ring comprises an inner back ring outer ring surface, an inner back ring inner ring surface and an inner back ring abutting surface, the diameter of the inner back ring inner ring surface is the same as that of the inner ring surface, and the inner back ring abutting surface abuts against the gasket abutting surface and the energy storage ring abutting surface. The diameter of the outer back ring inner ring surface is greater than or equal to the diameter of the inner back ring outer ring surface.

[0008] The high-pressure surface of the energy storage ring is provided with a V-shaped groove, the V-shaped groove is open to the outside of the energy storage ring, and a V-shaped spring is installed in the V-shaped groove.

[0009] The gasket, the outer back ring and the inner back ring can be made of copper, and the energy storage ring can be made of a high polymer material.

[0010] The technical scheme of the utility model has at least the following advantages and beneficial effects:

[0011] The sealing structure of the utility model is composed of an energy storage ring, an inner back ring, an outer back ring, a gasket and a V-shaped spring. The V-shaped spring is installed in the energy storage ring and provides initial back pressure for sealing; the gasket is embedded in the energy storage ring and blocks the gap between the inner back ring and the outer back ring; the inner back ring and the outer back ring are attached to the low-pressure side end surface of the energy storage ring; the outer back ring prevents the energy storage ring from being squeezed into the gap between the outer back ring and the mounting hole; and the inner back ring prevents the energy storage ring from being squeezed into the gap between the inner back ring and the piston rod. The integrity of the sealing structure is ensured, and the reliability and service life of the sealing are guaranteed.

[0012] In summary, the sealing structure has the advantages of good sealing effect, long service life, simple structure, convenient installation and the like, and has a wide application prospect. DRAWINGS

[0013] In order to more clearly illustrate the technical scheme of the utility model, the following will briefly introduce the drawings needed to be used in the embodiment, and it should be understood that the following drawings only show some embodiments of the utility model, and should not be regarded as limiting the scope.

[0014] Figure 1 It is a sealing structure diagram of the first embodiment in the utility model;

[0015] Figure 2 is a sealing structure diagram of the second embodiment of the utility model;

[0016] Figure 3 is a cross section diagram of the energy storage ring of the utility model;

[0017] Figure 4 is a cross section diagram of the back ring of the first embodiment of the utility model;

[0018] Figure 5 is a cross section diagram of the outer back ring of the second embodiment of the utility model;

[0019] Figure 6 is a cross section diagram of the inner back ring of the second embodiment of the utility model;

[0020] Figure 7 is a cross section diagram of the gasket of the utility model;

[0021] Figure 8 is an installation structure diagram of the utility model;

[0022] Marked in the figure: 1-energy storage ring, 11-high pressure surface, 12-outer ring surface, 13-inner ring surface, 14-energy storage ring contact surface, 141-groove, 2-back ring, 21-outer ring surface, 22-inner ring surface, 23-back ring contact surface, 24-outer back ring, 241-outer back ring outer ring surface, 242-outer back ring inner ring surface, 243-outer back ring contact surface, 25-inner back ring, 251-inner back ring outer ring surface, 252-inner back ring inner ring surface, 253-inner back ring contact surface, 3-gasket, 31-gasket contact surface, 4-V spring, 5-machine body, 6-piston rod. DETAILED DESCRIPTION

[0023] Please refer to Figure 1 , Figure 3 and Figure 4 , the first embodiment of the utility model, a combined sealing structure includes energy storage ring 1, back ring 2, energy storage ring 1 has high pressure surface 11, outer ring surface 12, inner ring surface 13, energy storage ring contact surface 14, if it is piston rod seal, inner ring surface 13 is the contact surface of piston rod, if it is inner hole seal, then outer ring surface 12 is the contact surface of inner hole, back ring 2 includes outer ring surface 21 and inner ring surface 22, back ring contact surface 23, energy storage ring contact surface 14 and back ring contact surface 23 contact fit, outer ring surface 12 and outer ring surface 21 are same in diameter, inner ring surface 13 and inner ring surface 22 are same in diameter.

[0024] Refer to Figure 1 , Figure 3 and Figure 7Further, the energy storage ring abutting surface 14 is provided with a groove 141, and a gasket 3 is arranged in the groove, the gasket 3 comprises a gasket abutting surface 31, the gasket abutting surface 31 is flush with the energy storage ring abutting surface 14, and the gasket abutting surface 31 and the energy storage ring abutting surface 14 jointly abut against the back ring abutting surface 23. By arranging the gasket 3, the supporting strength of the energy storage ring 1 can be obviously improved, and the service life of the energy storage ring 1 is improved.

[0025] Please refer to Figure 2 , Figure 3 , Figure 5 and Figure 6 , the second embodiment of the utility model, further, the back ring 2 comprises an outer back ring 24 and an inner back ring 25. The outer back ring 24 comprises an outer back ring outer ring surface 241, an outer back ring inner ring surface 242 and an outer back ring abutting surface 243, the diameter of the outer back ring outer ring surface 241 is same as the diameter of the outer ring surface 12, and the outer back ring abutting surface 243 abuts against the gasket abutting surface 31 and the energy storage ring abutting surface 14.

[0026] Please refer to Figure 2 , Figure 3 , Figure 5 and Figure 6 , further, the inner back ring 25 comprises an inner back ring outer ring surface 251, an inner back ring inner ring surface 252 and an inner back ring abutting surface 253, the diameter of the inner back ring inner ring surface 252 is same as the diameter of the inner ring surface 13, and the inner back ring abutting surface 253 abuts against the gasket abutting surface 31 and the energy storage ring abutting surface 14.

[0027] Please refer to Figure 8 , the outer back ring and the inner back ring are adopted, and installation is more convenient. If the sealing ring is used for the shaft, when the outer back ring 24 is installed, only the outer back ring outer ring surface 241 is matched with the body mounting surface, and the matching surface of the piston rod 6 is matched with the inner back ring inner ring surface 252. Therefore, the installation interference problem is not considered too much, the machining precision of the outer back ring inner ring surface 242 and the inner back ring outer ring surface 251 is not too high, and the manufacturing cost is reduced. For the inner hole sealing, the reverse is also true.

[0028] In addition, if the piston rod is sealed, the inner back ring 25 and the energy storage ring 1 are damaged due to long-term use, the damaged inner back ring 25 and energy storage ring 1 can be replaced alone, and the undamaged parts can continue to be used, so that the maintenance cost is reduced. Of course, for the inner hole sealing, the outer back ring 24 and the energy storage ring 1 may be worn faster. At the same time, the gasket 3 embedded in the energy storage ring 1 can block the gap between the inner back ring 25 and the outer back ring 24.

[0029] Please refer to Figure 2Further, the diameter of the inner ring surface 242 of the outer back ring is greater than or equal to the diameter of the outer ring surface 251 of the inner back ring. When the diameter of the inner ring surface 242 of the outer back ring is greater than the diameter of the outer ring surface 251 of the inner back ring, a ring space is left between the inner ring surface 242 of the outer back ring and the outer ring surface 251 of the inner back ring, which can provide sufficient installation size error, and at the same time, save the machining material of the outer back ring 24 and the inner back ring 25.

[0030] Please refer to Figure 2 , Figure 3 Further, the high-pressure surface 11 of the energy storage ring 1 is provided with a V-shaped groove, the V-shaped groove is opened to the outside of the energy storage ring 1, and a V-shaped spring 4 is installed in the V-shaped groove. The V-shaped spring 4 is installed in the energy storage ring 1 to provide initial back pressure for sealing.

[0031] Further, the gasket 3, the outer back ring 24 and / or the inner back ring 25 are made of copper material. Of course, tetrafluoro or nylon material can also be used. The energy storage ring 1 is made of high polymer material, and of course other suitable sealing ring materials can also be used.

Claims

1. A combined seal structure comprising an energy accumulator ring (1), a back ring (2), characterized in that: The energy storage ring (1) has a high-pressure surface (11), an outer ring surface (12), an inner ring surface (13), and an energy storage ring abutting surface (14), the back ring (2) includes an outer ring surface (21), an inner ring surface (22), and a back ring abutting surface (23), the energy storage ring abutting surface (14) and the back ring abutting surface (23) abut, the outer ring surface (12) and the outer ring surface (21) are the same diameter, and the inner ring surface (13) and the inner ring surface (22) are the same diameter.

2. A combined seal structure according to claim 1, characterized in that: The energy storage ring abutting surface (14) has a groove (141), and a gasket (3) is arranged in the groove (141), the gasket (3) includes a gasket abutting surface (31), the gasket abutting surface (31) is flush with the energy storage ring abutting surface (14), and the gasket abutting surface (31) and the energy storage ring abutting surface (14) are jointly abutted on the back ring abutting surface (23).

3. A combined seal structure according to claim 2, characterized in that: The back ring (2) includes an outer back ring (24) and an inner back ring (25).

4. A combined seal structure according to claim 3, wherein: The outer back ring (24) includes an outer back ring outer ring surface (241), an outer back ring inner ring surface (242), and an outer back ring abutting surface (243), the outer back ring outer ring surface (241) has the same diameter as the outer ring surface (12), and the outer back ring abutting surface (243) abuts the gasket abutting surface (31) and the energy storage ring abutting surface (14).

5. A combined seal structure according to claim 4, characterized in that: The inner back ring (25) includes an inner back ring outer ring surface (251), an inner back ring inner ring surface (252), and an inner back ring abutting surface (253), the inner back ring inner ring surface (252) has the same diameter as the inner ring surface (13), and the inner back ring abutting surface (253) abuts the gasket abutting surface (31) and the energy storage ring abutting surface (14).

6. A combined seal structure according to claim 5, wherein: The diameter of the outer back ring inner ring surface (242) is greater than or equal to the diameter of the inner back ring outer ring surface (251).

7. A combined seal structure according to any one of claims 1-6, characterized in that: The high-pressure surface (11) of the energy storage ring (1) has a V-shaped groove, the V-shaped groove is open to the outside of the energy storage ring (1), and a V-shaped spring (4) is installed in the V-shaped groove.

8. A combined seal structure according to any one of claims 3-6, characterized in that: The gasket (3), the outer back ring (24), and / or the inner back ring (25) are made of copper material.

9. A combined seal structure according to claim 8, characterized in that: The energy storage ring (1) is made of high polymer material.

Images