Sealing ring of hydraulic bolt tensioner

Abstract

The utility model discloses a hydraulic bolt tensioner sealing ring which comprises a hydraulic cylinder, a piston and a tensioner body, a groove is formed in the top of the hydraulic cylinder, a clamping groove is formed in the bottom of the piston, and a sealing ring body is arranged between the groove and the piston. The sealing ring body comprises an external sealing ring and an internal sealing ring; an external check ring is arranged on the outer side of the external sealing ring in a sleeving mode, and an internal check ring is arranged in the internal sealing ring. The sealing ring is composed of the external sealing ring, the external check ring, the internal sealing ring and the internal check ring, the external sealing ring and the internal sealing ring are both of a lip-shaped sealing structure, the higher the borne pressure is, the wider the sealing lip is opened, and the better the sealing effect is; meanwhile, the clamping groove is designed, the external sealing ring and the internal sealing ring are each provided with a step with taper, the steps with the taper are just pushed into the clamping groove in the assembling process, and stability is achieved; therefore, the sealing structure has the advantages of being excellent in sealing performance and longer in service life.

Description

Technical Field

[0001] The utility model relates to the technical field of tensioner sealing rings, in particular to a hydraulic bolt tensioner sealing ring. Background Art

[0002] Bolt tensioner is the abbreviation of bolt hydraulic tensioner. It uses the hydraulic source provided by the hydraulic booster pump (ultra-high pressure hydraulic pump) to determine the tension according to the tensile strength, yield coefficient and elongation of the material. The tension generated by the ultra-high pressure oil pump causes the bolt to be elongated in the elastic deformation zone, and the bolt diameter is slightly deformed, making the nut easy to loosen. In addition, the hydraulic tensioner can also be used as a device for applying axial force to the hydraulic interference connection for top pressure installation. Its biggest advantage is that it can allow multiple bolts to be tightened and removed at a fixed value at the same time, with uniform force distribution. It is the best tool for tightening and removing bolts of various specifications.

[0003] Since hydraulic bolt tensioners are high pressure or ultra-high pressure products, they require very high sealing ability of the seals. Traditional hydraulic bolt tensioner seals generally use a combination of O-rings and retaining rings (such as Figure 6 As shown in the figure, the O-ring is prone to rolling and wear in the groove, resulting in sealing failure. In addition, the O-ring is prone to distortion in the groove, which can also cause sealing failure, and the O-ring as a sealing ring cannot withstand high pressure.

[0004] Therefore, those skilled in the art have proposed a sealing ring for a hydraulic bolt tensioner. Utility Model Content

[0005] The utility model discloses a sealing ring of a hydraulic bolt tensioner, aiming to solve the technical problems in the background technology.

[0006] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0007] A sealing ring for a hydraulic bolt tensioner, comprising a hydraulic cylinder, a piston and a tensioner body, wherein the hydraulic cylinder and the piston are both mounted on the tensioner body, a groove is provided on the top of the hydraulic cylinder, a clamping groove is provided on the bottom of the piston, and a sealing ring body is provided between the groove and the piston;

[0008] The sealing ring body comprises an external sealing ring and an internal sealing ring;

[0009] An external retaining ring is sleeved on the outer side of the external sealing ring, a first groove is provided on the outer side of the external sealing ring, the external retaining ring is slidably connected to the outer side of the first groove, a first inclined surface is provided on the outer side of the external sealing ring and located above the first groove, a first sealing lip is provided at the bottom of the external sealing ring, and a second sealing lip is provided at the bottom of the external sealing ring and located on one side of the first sealing lip;

[0010] A built-in retaining ring is arranged inside the built-in sealing ring, a second groove is opened inside the built-in sealing ring, the built-in retaining ring is slidably connected to the inside of the second groove, a second inclined surface is opened inside the built-in sealing ring and located above the second groove, a third sealing lip is arranged at the bottom of the built-in sealing ring, and a fourth sealing lip is arranged at the bottom of the built-in sealing ring and located on one side of the third sealing lip.

[0011] The utility model provides a hydraulic bolt tensioner sealing ring with the following advantages:

[0012] The device is composed of an external sealing ring, an external retaining ring and an internal sealing ring and an internal retaining ring. Both the external sealing ring and the internal sealing ring adopt a lip sealing structure. The higher the pressure they withstand, the wider the sealing lip opens and the better the sealing effect. At the same time, a card slot is designed. Both the external sealing ring and the internal sealing ring are designed with a tapered step. During assembly, the tapered step just pushes into the card slot, which is very stable. This allows the application to have the advantages of excellent sealing performance and longer service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 The utility model is an isometric view of the installation state of the sealing ring of the hydraulic bolt tensioner sealing ring.

[0014] Figure 2 The utility model is a schematic diagram of the connection state of the hydraulic cylinder and the piston of the sealing ring of the hydraulic bolt tensioner.

[0015] Figure 3 The utility model provides a cross-sectional view of an external sealing ring of a hydraulic bolt tensioner sealing ring.

[0016] Figure 4 The utility model provides a cross-sectional view of a built-in sealing ring of a hydraulic bolt tensioner sealing ring.

[0017] Figure 5 This is a cross-sectional view of the installation state of a sealing ring of a hydraulic bolt tensioner proposed by the utility model located inside the tensioner.

[0018] Figure 6 This is a cross-sectional view of the installation state of a traditional tensioner sealing ring of a hydraulic bolt tensioner sealing ring proposed by the utility model.

[0019] In the accompanying drawings: 1. hydraulic cylinder; 2. piston; 3. groove; 4. slot; 5. sealing ring body; 5.1A. external sealing ring; 5.2A. external retaining ring; 5.3A. first groove; 5.4A. first inclined surface; 5.5A. first sealing lip; 5.6A. second sealing lip; 5.1B. internal sealing ring; 5.2B. internal retaining ring; 5.3B. second groove; 5.4B. second inclined surface; 5.5B. third sealing lip; 5.6B. fourth sealing lip; 6. stretcher body. DETAILED DESCRIPTION

[0020] The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application usually described and marked in the drawings here can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the application claimed for protection, but merely represents the selected embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without making creative work belong to the scope of protection of the present application.

[0021] The utility model discloses a sealing ring for a hydraulic bolt tensioner.

[0022] Reference Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, a sealing ring of a hydraulic bolt tensioner comprises a hydraulic cylinder 1, a piston 2 and a tensioner body 6. The hydraulic cylinder 1 and the piston 2 are both mounted on the tensioner body 6. A groove 3 is provided on the top of the hydraulic cylinder 1, a clamping groove 4 is provided on the bottom of the piston 2, and a sealing ring body 5 is provided between the groove 3 and the piston 2.

[0023] The sealing ring body 5 comprises an external sealing ring 5.1A and an internal sealing ring 5.2B;

[0024] An external retaining ring 5.2A is sleeved on the outer side of the external sealing ring 5.1A, a first groove 5.3A is provided on the outer side of the external sealing ring 5.1A, the external retaining ring 5.2A is slidably connected to the outer side of the first groove 5.3A, a first inclined surface 5.4A is provided on the outer side of the external sealing ring 5.1A and located above the first groove 5.3A, a first sealing lip 5.5A is provided at the bottom of the external sealing ring 5.1A, and a second sealing lip 5.6A is provided at the bottom of the external sealing ring 5.1A and located on one side of the first sealing lip 5.5A;

[0025] The external sealing ring 5.1A is designed as a "Y"-shaped structure. When pressure is charged between the first sealing lip 5.5A and the second sealing lip 5.6A, the first sealing lip 5.5A opens outward and the second sealing lip 5.6A opens inward. The greater the pressure, the wider the first sealing lip 5.5A and the second sealing lip 5.6A open, and the better the sealing effect on the piston 2 and the hydraulic cylinder 1. The function of the external retaining ring 5.2A is to protect the first sealing lip 5.5A to prevent the first sealing lip 5.5A from being damaged when high pressure or ultra-high pressure occurs. The function of the first inclined surface 5.4A is to push the first inclined surface 5.4A into the groove 4 when the piston 2 is installed in the groove 3, so that the piston 2 is completely locked in the groove 3, which is very stable, so that the piston seal 1 can exert the best sealing effect.

[0026] A built-in retaining ring 5.2B is arranged inside the built-in sealing ring 5.1B, a second groove 5.3B is provided inside the built-in sealing ring 5.1B, the built-in retaining ring 5.2B is slidably connected inside the second groove 5.3B, a second inclined surface 5.4B is provided inside the built-in sealing ring 5.1B and above the second groove 5.3B, a third sealing lip 5.5B is arranged at the bottom of the built-in sealing ring 5.1B, and a fourth sealing lip 5.6B is arranged at the bottom of the built-in sealing ring 5.1B and on one side of the third sealing lip 5.5B;

[0027] The built-in sealing ring 5.1B is designed to be an inverted "Y"-shaped structure. When pressure is charged between the third sealing lip 5.5B and the fourth sealing lip 5.6B, the third sealing lip 5.5B opens inward and the fourth sealing lip 5.6B opens outward. The greater the pressure, the wider the third sealing lip 5.5B and the fourth sealing lip 5.6B open, and the better the sealing effect on the piston 2 and the groove 3. The function of the built-in retaining ring 5.2B is to protect the fourth sealing lip 5.6B to prevent the fourth sealing lip 5.6B from being damaged when high pressure or ultra-high pressure occurs. The function of the second inclined surface 5.4B is to push the second inclined surface 5.4B into the groove 4 when the piston 2 is installed in the groove 3, so that the piston 2 is completely locked in the groove 3, which is very stable, so that the piston seal 2 can exert the best sealing effect.

[0028] The above is only a preferred specific implementation of the utility model, but the protection scope of the utility model is not limited to this. The replacement can be a replacement of part of the structure, device, method step, or a complete technical solution. Equivalent replacement or change based on the technical solution of the utility model and its utility model concept should be included in the protection scope of the utility model.

Claims

1. A sealing ring for a hydraulic bolt tensioner, comprising a hydraulic cylinder (1), a piston (2) and a tensioner body (6), characterized in that: The top of the hydraulic cylinder (1) is provided with a groove (3), the bottom of the piston (2) is provided with a clamping groove (4), and a sealing ring body (5) is provided between the groove (3) and the piston (2); The sealing ring body (5) comprises an external sealing ring (5.1A) and an internal sealing ring (5.2B); An external retaining ring (5.2A) is sleeved on the outer side of the external sealing ring (5.1A), and an internal retaining ring (5.2B) is arranged inside the internal sealing ring (5.1B).

2. A sealing ring for a hydraulic bolt tensioner according to claim 1, characterized in that: A first groove (5.3A) is provided on the outer side of the external sealing ring (5.1A); the external retaining ring (5.2A) is slidably connected to the outer side of the first groove (5.3A); a first inclined surface (5.4A) is provided on the outer side of the external sealing ring (5.1A) and located above the first groove (5.3A); a first sealing lip (5.5A) is provided at the bottom of the external sealing ring (5.1A); and a second sealing lip (5.6A) is provided at the bottom of the external sealing ring (5.1A) and located on one side of the first sealing lip (5.5A).

3. A sealing ring for a hydraulic bolt tensioner according to claim 1, characterized in that: A second groove (5.3B) is provided inside the built-in sealing ring (5.1B), the built-in retaining ring (5.2B) is slidably connected inside the second groove (5.3B), a second inclined surface (5.4B) is provided inside the built-in sealing ring (5.1B) and above the second groove (5.3B), a third sealing lip (5.5B) is provided at the bottom of the built-in sealing ring (5.1B), and a fourth sealing lip (5.6B) is provided at the bottom of the built-in sealing ring (5.1B) and on one side of the third sealing lip (5.5B).

4. A sealing ring for a hydraulic bolt tensioner according to claim 1, characterized in that: The hydraulic cylinder (1) and the piston (2) are both mounted on the stretcher body (6).

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