Ferrule type sealing pipe joint structure

Abstract

The invention provides a ferrule type sealing pipe joint structure, which relates to the technical field of pipeline connection, and comprises a joint, a nut, a rear ferrule, a compression ring and a sealing ring, the inner end face of the far end of the nut is a first conical face with the diameter gradually increased from far to near. The axial section of the near end of the rear clamping sleeve is in an arch shape, and a cutting edge is arranged on the side, close to the pipe body, of the arch-shaped near end. The far end of the compression ring abuts against the first conical face, and the near end of the compression ring abuts against the connector. The inner side surface of the compression ring comprises a third conical surface; the sealing ring is positioned between the compression ring and the pipe joint; the cutting edge at the near end of the rear clamping sleeve cuts into the pipe body to achieve the high-pull-out-force anti-disengagement function, the requirement for the pipeline connection pressure tolerance condition is met, the cut-in pull-out force of the rear clamping sleeve can be guaranteed, and the anti-loosening and anti-disengagement effects are not invalid; and the sealing ring can prevent fluid in the pipeline from leaking, the sealing requirement is met, and the use cost of the ferrule type sealing pipe joint structure is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of pipeline connection, and in particular to a ferrule-type sealing pipe joint structure. Background Art

[0002] The pipeline system is a carrier of various fluid media and is widely used in all walks of life. It not only plays an extremely important role in industrial and agricultural production, national defense and scientific research, but is also closely related to our daily life. With the development of various scientific and technological fields, the application scope of the pipeline system is not only getting wider and wider, but also its connection methods are constantly increasing and updating, and higher requirements are put forward for the convenience of installation and construction of the pipeline system and the safety and reliability of the use of the pipeline system. Therefore, the ferrule pipe joint is produced.

[0003] The ferrule type pipe fitting is a convenient, reliable and easy to install and disassemble connection method for medium and high pressure pipelines. It was first invented by the German ERMETO company in 1930. After more than half a century of development, the ferrule type pipe fitting has become the most advanced pipe fitting in the world. At present, the ferrule type pipe fitting is widely used in chemical industry, machinery, electronics, electric power, aerospace, military industry, medicine, light industry and scientific research industries.

[0004] The present application proposes a new solution to the problem that the anti-loosening, anti-dropping and sealing effects of the ferrule type pipe joint are relatively poor. Summary of the invention

[0005] The purpose of the present invention is to provide a ferrule-type sealing pipe joint structure to solve the problems existing in the prior art, meet the pressure tolerance of the pipeline connection, ensure the pull-out force of the rear ferrule cutting in, and the anti-loosening and anti-detachment effects are not invalid; and the sealing ring can avoid fluid leakage in the pipeline, meet the sealing requirements, and reduce the use cost of the ferrule-type sealing pipe joint structure.

[0006] To achieve the above object, the present invention provides the following solutions: A ferrule-type sealing pipe joint structure, comprising a joint, a nut, a rear ferrule, a compression ring and a sealing ring, wherein the joint is used to be sleeved on the end of a pipe body; the nut is threadedly connected to the pipe joint; with the end where the nut is located as the distal direction and the end where the joint is located as the proximal direction, the inner end face of the distal end of the nut is a first conical surface whose diameter gradually increases from distal to proximal; the distal end of the rear ferrule is a second conical surface that fits with the first conical surface, the axial cross-section of the proximal end of the rear ferrule is an arched shape, the opening of the arched shape faces the side where the pipe body is located, and the proximal end of the arched shape is provided with a cutting edge on the side close to the pipe body; the distal end of the compression ring abuts against the first conical surface, and the proximal end of the compression ring abuts against the joint; the inner side surface of the compression ring includes a third conical surface whose diameter gradually decreases from distal to proximal, and the distal end of the third conical surface is used for the proximal end of the rear ferrule to be inserted; the sealing ring is located between the compression ring and the pipe joint.

[0007] As an embodiment, the end of the joint has an annular groove for accommodating the O-ring, and the groove top of the annular groove abuts against the proximal end of the compression ring.

[0008] As one embodiment, the distal end of the compression ring is an equal-diameter section, and the inner wall surface of the equal-diameter section is connected to the large-diameter end of the third conical surface; the side of the distal end of the equal-diameter section away from the tube body abuts against the first conical surface; the middle part of the rear ferrule has a step structure, and the step structure abuts against the side of the distal end of the equal-diameter section close to the tube body.

[0009] As an implementation manner, the inclination angle of the first tapered surface relative to the central axis of the tube body is 40°~50°.

[0010] As an implementation manner, the inclination angle of the first tapered surface relative to the central axis of the tube body is 45°.

[0011] As an implementation manner, the inclination angle of the third conical surface relative to the central axis of the tube body is 15°~25°.

[0012] As an implementation manner, the inclination angle of the third conical surface relative to the central axis of the tube body is 20°.

[0013] As an implementation manner, the joint is a straight joint, an elbow joint or a tee joint.

[0014] As one implementation, the rear ferrule is made of austenitic stainless steel.

[0015] As one embodiment, the nut is a hexagonal nut.

[0016] Compared with the prior art, the present invention has the following technical effects: The present invention realizes the anti-detachment function of high pull-out force by cutting into the tube body with the blade at the proximal end of the rear ferrule, which meets the pressure tolerance of the pipeline connection, especially under the conditions of high and low temperature, vibration impact, deflection and bursting pressure, the pull-out force of the rear ferrule can be guaranteed, and the anti-loosening and anti-detachment effects are not invalid; and the sealing ring can avoid fluid leakage in the pipeline, meeting the sealing requirements. At the same time, the maintenance and replacement costs of the sealing ring are low, which can reduce the use cost of the ferrule-type sealing pipe joint structure. In addition, the ferrule-type sealing pipe joint structure in the present invention is simple in structure, more convenient to disassemble and assemble, and can improve the disassembly and assembly efficiency.

[0017] Other technical solutions of the present invention also have the following technical effects: The compression ring in the present invention is made of metal and has been heat treated and anti-corrosion treated to have higher strength and improve wear resistance, thereby ensuring that it can be repeatedly installed and increasing its service life; The rear ferrule in the present invention is made of austenitic stainless steel material, so that the rear ferrule has the hardness to easily cut into the steel pipe, and ensures that it will not crack when the bow deformation occurs, and improves the wear resistance to ensure that it can be repeatedly installed and increase the service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0019] Figure 1 It is a schematic diagram of the structure in which the nut and the joint are not tightened in a ferrule-type sealing pipe joint structure in one embodiment of the present invention; Figure 2 It is a schematic diagram of the structure after the nut and the joint are tightened in a ferrule-type sealing pipe joint structure in one embodiment of the present invention.

[0020] Description of reference numerals: 1. Nut; 2. Back ferrule; 3. Compression ring; 4. Sealing ring; 5. Connector; 6. Pipe body. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0022] The purpose of the present invention is to provide a ferrule-type sealing pipe joint structure to solve the problems existing in the prior art, meet the pressure tolerance of the pipeline connection, ensure the pull-out force of the rear ferrule cutting in, and the anti-loosening and anti-detachment effects are not invalid; and the sealing ring can avoid fluid leakage in the pipeline, meet the sealing requirements, and reduce the use cost of the ferrule-type sealing pipe joint structure.

[0023] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0024] like Figure 1 , Figure 2 As shown, this embodiment provides a ferrule-type sealing pipe joint 5 structure, including a joint 5, a nut 1, a rear ferrule 2, a compression ring 3 and a sealing ring 4. The joint 5 is used to be sleeved on the end of a pipe body 6. The pipe body 6 in this embodiment is usually a metal pipe body 6, such as a steel pipe; the nut 1 is threadedly connected to the pipe joint 5. In the present embodiment, it is stipulated that the end where the nut 1 is located is the distal direction, and the end where the joint 5 is located is the proximal direction, the inner end face of the distal end of the nut 1 is a first conical surface whose diameter gradually increases from far to near; the distal end of the rear ferrule 2 is a second conical surface that fits with the first conical surface, the axial cross-section of the proximal end of the rear ferrule 2 is an arch shape, the opening of the arch shape faces the side where the tube body 6 is located, and a cutting edge is provided on the side of the proximal end of the arch shape close to the tube body 6; the distal end of the compression ring 3 abuts against the first conical surface, and the proximal end of the compression ring 3 abuts against the joint 5; the inner side surface of the compression ring 3 includes a third conical surface whose diameter gradually decreases from far to near, and the distal end of the third conical surface is used for the proximal end of the rear ferrule 2 to be inserted; the sealing ring 4 is located between the compression ring 3 and the pipe joint 5.

[0025] During use, when the nut 1 is tightened onto the joint 5, the first conical surface at the distal end of the nut 1 pushes the rear ferrule 2 to move toward the joint 5, and the proximal end of the rear ferrule 2 is inserted into the distal end of the compression ring 3 and pushes the compression ring 3 to move toward the joint 5; the compression ring 3 abuts against the end face of the joint 5 and compresses the sealing ring 4 to achieve sealing; when the nut 1 continues to be tightened, the proximal end of the rear ferrule 2 approaches the tube body 6 under the action of the radial force of the third conical surface, and finally the cutting edge cuts into the tube body 6.

[0026] Therefore, in this embodiment, the cutting edge of the proximal end of the rear ferrule 2 cuts into the tube body 6 to achieve a high pull-out force anti-detachment function, which meets the pressure tolerance of the pipeline connection, especially under high and low temperature, vibration impact, deflection and bursting pressure conditions, the pull-out force of the rear ferrule 2 can be guaranteed, and the anti-loosening and anti-detachment effects are not invalid; and the sealing ring 4 can avoid fluid leakage in the pipeline, meet the sealing requirements, and at the same time, the maintenance and replacement costs of the sealing ring 4 are low, which can reduce the use cost of the ferrule type sealing pipe joint 5 structure. In addition, the structure of the ferrule type sealing pipe joint 5 in this embodiment is simple, and disassembly and assembly are more convenient, which can improve the disassembly and assembly efficiency.

[0027] The compression ring 3 in this embodiment is made of metal and has been subjected to heat treatment and anti-corrosion treatment to have higher strength and improve wear resistance, thereby ensuring that it can be installed repeatedly and increasing its service life.

[0028] In this embodiment, the end of the joint 5 has an annular groove for accommodating the sealing ring 4. When the groove top of the annular groove abuts against the proximal end of the compression ring 3, the joint 5 and the compression ring 3 can press the sealing ring 4 to achieve a sealing effect.

[0029] In this embodiment, the distal end of the compression ring 3 is an equal diameter section, and the inner wall surface of the equal diameter section is connected to the large diameter end of the third tapered surface. When the nut 1 is not tightened, the proximal end of the rear ferrule 2 is located radially inside the equal diameter section, and the side of the distal end of the equal diameter section away from the tube body 6 abuts against the first tapered surface; the middle part of the rear ferrule 2 has a step structure, and the step structure abuts against the side of the distal end of the equal diameter section close to the tube body 6.

[0030] In this embodiment, the inclination angle of the first tapered surface relative to the central axis of the tube body 6 is 40°-50°; the specific inclination angle is 45°.

[0031] In this embodiment, the inclination angle of the third conical surface relative to the central axis of the tube body 6 is 15° to 25°; the specific inclination angle is 20°.

[0032] In this embodiment, the joint 5 is a straight joint, an elbow joint or a tee joint.

[0033] In this embodiment, the rear ferrule 2 is made of austenitic stainless steel material, so that the rear ferrule 2 has the hardness to easily cut into the steel pipe, and ensures that it will not crack when the bow deformation occurs, and improves the wear resistance to ensure that it can be repeatedly installed and increase the service life.

[0034] As one embodiment, the nut 1 is a hexagonal nut, and the sealing ring 4 is an O-ring.

[0035] Adaptive changes made according to actual needs are all within the protection scope of the present invention.

[0036] The present invention uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only used to help understand the method and core ideas of the present invention. At the same time, for those skilled in the art, according to the ideas of the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A ferrule-type sealing pipe joint structure, characterized in that: include: A joint, the joint being used to be sleeved on the end of the pipe body; A nut, the nut being threadedly connected to the pipe joint; with the end where the nut is located as the distal direction and the end where the joint is located as the proximal direction, the inner end surface of the distal end of the nut is a first conical surface with a diameter gradually increasing from the distal end to the proximal end; A rear ferrule, wherein the distal end of the rear ferrule is a second conical surface that fits the first conical surface, the axial cross-section of the proximal end of the rear ferrule is an arcuate shape, the opening of the arcuate shape faces the side where the tube body is located, and a cutting edge is provided on the side of the proximal end of the arcuate shape close to the tube body; A compression ring, wherein the distal end of the compression ring abuts against the first conical surface, and the proximal end of the compression ring abuts against the joint; the inner side surface of the compression ring comprises a third conical surface whose diameter gradually decreases from distal to proximal, and the distal end of the third conical surface is used for the proximal end of the rear ferrule to be inserted; and a sealing ring, wherein the sealing ring is located between the compression ring and the pipe joint.

2. The ferrule-type sealing pipe joint structure according to claim 1, characterized in that: The end of the joint is provided with an annular groove for accommodating the sealing ring, and the groove top of the annular groove abuts against the proximal end of the compression ring.

3. The ferrule-type sealing pipe joint structure according to claim 1, characterized in that: The distal end of the compression ring is an equal-diameter section, and the inner wall surface of the equal-diameter section is connected to the large-diameter end of the third conical surface; the distal end of the equal-diameter section abuts against the first conical surface on the side away from the tube body; the middle part of the rear ferrule has a step structure, and the step structure abuts against the distal end of the equal-diameter section close to the tube body.

4. The ferrule-type sealing pipe joint structure according to claim 1, characterized in that: The inclination angle of the first conical surface relative to the central axis of the tube body is 40°-50°.

5. The ferrule-type sealing pipe joint structure according to claim 4, characterized in that: The inclination angle of the first conical surface relative to the central axis of the tube body is 45°.

6. The ferrule-type sealing pipe joint structure according to claim 1, characterized in that: The inclination angle of the third conical surface relative to the central axis of the tube body is 15°~25°.

7. The ferrule-type sealing pipe joint structure according to claim 6, characterized in that: The inclination angle of the third conical surface relative to the central axis of the tube body is 20°.

8. The ferrule-type sealing pipe joint structure according to claim 1, characterized in that: The joint is a straight joint, an elbow joint or a tee joint.

9. The ferrule-type sealing pipe joint structure according to claim 1, characterized in that: The rear ferrule is made of austenitic stainless steel.

10. The ferrule-type sealing pipe joint structure according to claim 1, characterized in that: The nut is a hexagonal nut, and the sealing ring is an O-type sealing ring.

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