CN205118500U - Use double cassette casing joint on gas turbine fuel pipe - Google Patents

Abstract

The utility model discloses a double ferrule pipe joint applied on a fuel conduit of a gas turbine. The double ferrule pipe joint comprises a conical joint, a front ferrule, a rear ferrule, a ferrule and an overcoat nut; the head of the conical joint The inner side is provided with a conical surface, and the outer side is provided with threads; the conical joint is also provided with an I-shaped cylindrical hole; the lower end of the front ferrule is provided with a conical surface, and the upper end is provided with a chamfered surface; the upper end of the rear ferrule is flat, and the lower end is provided with a Tapered surface; the catheter is inserted into one end of the I-shaped cylindrical hole of the taper joint and fixed by welding; the front ferrule and the rear ferrule are sequentially sleeved on the ferrule; the lower end of the rear ferrule is inserted into the front ferrule Squeeze fit inside the chamfered surface; insert the tube into the other end of the I-shaped cylindrical hole of the cone joint, the outer nut is set on the tube, and the outer nut is threaded to the outside of the cone joint. The technical solution of the utility model is simple to manufacture, reasonable in structural design and strong in operability.

Description

A dual-barrel joint used in gas turbine fuel conduits

technical field

The utility model relates to the field of gas turbine design, in particular to a double-cut pipe joint applied to a gas turbine fuel conduit.

Background technique

The problem of fuel leakage is an important problem that must be avoided and eliminated in any gas turbine power plant. Since the fuel pipe needs to be assembled and disassembled, it is necessary to assemble the pipe joint and strictly seal it. The fuel pipe joints of aeroderivative gas turbines produced in China today are "ball-cone" connections, and the structure includes: conduits, ball joints, outer nuts, and cone joints, as shown in Figure 1. The assembly process of the fuel conduit with a ball-cone structure pipe joint is as follows: first, it is necessary to ensure that the spherical surface and the conical surface are tightly bonded; second, the ball joint is inserted into the center of the outer nut and welded with the conduit; third, the conical joint It is welded with the conduit; finally, the ball joint is coaxially connected with the cone joint, and the outer nut is tightened to complete the connection of the fuel conduit. Once the tightness between the spherical surface and the conical surface is not perfect and the spherical joint and the conical joint are not installed on the same axis during the installation process, fuel leakage accidents are likely to occur.

Utility model content

In order to solve the above technical problems, the purpose of this utility model is to provide a double ferrule joint applied on the gas turbine fuel conduit, the specific technical scheme is as follows:

A double ferrule joint applied to a fuel conduit of a gas turbine, the double ferrule joint includes a cone joint, a front ferrule, a rear ferrule, a ferrule and an overcoat nut;

The inner side of the head of the conical joint is provided with a conical surface, and the outer side is provided with threads;

The conical joint is also provided with an I-shaped cylindrical hole;

The lower end of the front ferrule is provided with a tapered surface, and the upper end is provided with a chamfered surface;

The upper end of the rear ferrule is a plane, and the lower end is provided with a tapered surface; the rear ferrule is a conical ring structure with inner and outer grooves, and the upper end face is a plane, which is an extrusion surface formed by assembling with the outer nut; The groove has the function of hinge clamp, which enhances the firmness and anti-vibration fatigue performance, and its elastic structure helps to eliminate the thermal shock and leakage caused by the rapid thermal expansion or contraction of the unit; Used for squeezing and pushing forward ferrule;

The conduit is inserted into one end of the I-shaped cylindrical hole of the conical joint and fixed by welding; the conical surface of the front ferrule and the conical surface of the head of the conical joint form a main seal.

Sleeve the front ferrule and the rear ferrule on the ferrule in sequence;

The tapered surface at the lower end of the rear ferrule is plugged into the chamfered surface of the front ferrule for extrusion fit; grasp it firmly to prevent the ferrule from being disengaged

Inserting the ferrule into the other end of the I-shaped cylindrical hole of the cone joint, and the conical surface of the front ferrule is in contact with the conical surface of the head of the conical joint;

The overcoat nut is set on the ferrule, and the upper end surface of the rear ferrule and the overcoat nut form an extrusion surface; the contact surface between the front ferrule and the ferrule, and the extruding surface between the rear ferrule and the front ferrule , The extrusion surface of the rear ferrule and the ferrule forms 3 auxiliary seals.

The outer casing nut is threadedly connected to the outside of the conical joint.

The preferred solution of the dual-ferrule joint applied to the gas turbine fuel conduit is that the ferrule is a stainless steel pipe with compressive strength and low roughness on the outer surface.

Beneficial effects of the utility model: the technical solution of the utility model is simple and convenient to manufacture, and has strong operability. The joint with double ferrule structure is adopted, and the groove structure of the rear ferrule is helpful to produce engineering hinge and clamp effect. , this action converts the axial movement into a radial squeeze on the tube, gripping the tube, and then the ferrule assists the front ferrule to wedge between the taper joint and the tube to form a seal , to ensure that there is no leakage of the fuel pipe, the installation method is simple, easy to install correctly and reinstall reliably, and save labor costs; anti-vibration fatigue, anti-thermal shock, improve the reliability of the fuel pipeline, save the maintenance cost of the unit, and ensure the safe operation of the unit. Therefore adopting this structure has great social benefit and economic benefit.

Description of drawings

Fig. 1 is the schematic diagram of spherical cone structure catheter;

Fig. 2 is a schematic diagram of a double ferrule fitting applied to a fuel conduit of a gas turbine;

Fig. 3 is a schematic diagram of a taper joint in Fig. 2;

Fig. 4 is a schematic diagram of the front ferrule in Fig. 2;

Fig. 5 is a schematic diagram of the rear ferrule in Fig. 2 .

In the figure: 1 is the cone joint, 2 is the front ferrule, 3 is the rear ferrule, 4 is the ferrule, 5 is the outer nut, and 6 is the guide tube.

detailed description

As shown in Figure 2, a double ferrule pipe joint applied on the fuel conduit of a gas turbine, the double ferrule pipe joint includes a conical joint 1, a front ferrule 2, a rear ferrule 3, a ferrule 4 and an overcoat nut 5;

The inside of the head of the tapered joint 1 is provided with a tapered surface 7, and the outside is provided with threads;

The taper joint 1 is also provided with an I-shaped cylindrical hole;

The lower end of the front ferrule 2 is provided with a tapered surface, and the upper end is provided with a chamfered surface;

The upper end of the rear ferrule 3 is a plane, and the lower end is provided with a tapered surface;

The conduit 6 is inserted into one end of the I-shaped cylindrical hole of the tapered joint 1 and fixed by welding;

The front ferrule 2 and the rear ferrule 3 are sequentially socketed on the ferrule 4;

The tapered surface at the lower end of the rear ferrule 3 is inserted into the chamfered surface of the front ferrule 2 for extrusion fit;

Insert the ferrule 4 into the other end of the I-shaped cylindrical hole of the conical joint 1, and the conical surface of the front ferrule 2 is in contact with the conical surface of the head of the conical joint 1;

The outer casing nut 5 is set on the ferrule 4, and the upper end surface of the rear ferrule 3 and the outer casing nut 5 form a pressing surface;

The outer casing nut 5 is threadedly connected with the outside of the taper joint 1 .

The tube 4 is a stainless steel tube with compressive strength and low surface roughness.

Claims (2)

1. A double ferrule fitting applied to a gas turbine fuel conduit, characterized in that: The dual tube fitting includes a cone fitting, a front ferrule, a rear ferrule, a tube, and a jacket nut; The inner side of the head of the conical joint is provided with a conical surface, and the outer side is provided with threads; The conical joint is also provided with an I-shaped cylindrical hole; The lower end of the front ferrule is provided with a tapered surface, and the upper end is provided with a chamfered surface; The upper end of the rear ferrule is a plane, and the lower end is provided with a tapered surface; The catheter is inserted into one end of the I-shaped cylindrical hole of the tapered joint and fixed by welding; Sleeve the front ferrule and the rear ferrule on the ferrule in sequence; The tapered surface at the lower end of the rear ferrule is inserted into the chamfered surface of the front ferrule for extrusion fit; Inserting the ferrule into the other end of the I-shaped cylindrical hole of the cone joint, and the conical surface of the front ferrule is in contact with the conical surface of the head of the conical joint; The overcoat nut is sleeved on the tube, and the upper end surface of the back ferrule and the overcoat nut form an extrusion surface; The outer casing nut is threadedly connected to the outside of the conical joint. 2 . A double ferrule joint applied to a fuel conduit of a gas turbine as claimed in claim 1 , wherein the ferrule is a stainless steel pipe capable of resisting compression and having a small outer surface roughness. 3 .