Adjustable pipe connection joint

Abstract

The present invention discloses an adjustable pipe connection joint. It comprises: component one, having a pipe connection part, three steps with decreasing outer diameters, the second step is provided with an external thread, the third step is a conical step and provided with a sealing cone thread; component two, the central circular through hole is provided with a connecting internal thread matching the second step of component one; component three, having a pipe connection part, two steps with decreasing outer diameters, the second step is provided with an external thread and is the same as the external thread of component one and matches the connecting internal thread of component two, and the inner wall of the second step of component three is provided with an internal thread matching the sealing cone thread of component one. The connection joint of the present invention adopts a split thread structure, and the thread engagement length can be flexibly adjusted according to the spacing of the steel pipes to realize the function of the changeable joint body, ensuring that the end face of the pipe is always in good contact with the inner end face of the joint. At the same time, the internal thread adopts a sealing cone thread to increase the sealing performance. The thread group has opposite rotation directions, and is stable after installation, eliminating the leakage risk.

Description

Technical Field

[0001] The invention belongs to the technical field of designing and manufacturing connecting fasteners, in particular to the technical field of designing and manufacturing pipeline connecting parts, and particularly relates to an adjustable pipeline connecting joint. Background Art

[0002] The commonly used ferrule-type pipe joints are mainly composed of ferrule nuts, ferrules and joints. The installation method is to insert the ferrule and nut into the ferrule, and then insert one end of the ferrule into the joint. The two ends ensure that the steps inside the joint are in contact with the end face of the ferrule. Finally, tighten the ferrule nut to the specified angle to complete the installation. Whether the ferrule is in good contact with the internal steps of the joint during the installation process will affect the sealing of the entire connection system. During the normal installation process, due to human factors, installation tolerances and processing accuracy, it is difficult to ensure that the end face of the pipe is in full contact with the step. The joint body in the middle of the conventional pipe joint is an integrated type, and the end face of the pipe needs to fit tightly with the joint body to ensure the sealing of the system. When the distance between the two pipelines changes, the length of the joint body cannot be adjusted, resulting in the inability of the end face of the pipeline to fit tightly with the joint body, which is prone to leakage. Summary of the invention

[0003] The present invention discloses an adjustable pipe connection joint in view of the deficiencies of the prior art. The purpose of the present invention is to provide a joint for pipe connection, which can flexibly adjust the thread engagement length according to the spacing of steel pipes, ensure that the pipe end face is always in good contact with the inner end face of the joint, and prevent connection leakage.

[0004] The present invention is achieved through the following technical solutions:

[0005] An adjustable pipe connection joint, the connection joint is used to connect a cylindrical pipe, comprising a cylindrical pipe component one and a component three connected and fixed to the pipes at both ends, characterized in that it also comprises a component two whose outer cross-sectional profile is a regular polygon and whose center is a circular through hole;

[0006] Component 1: One end of the cylindrical pipe fitting has a pipe connection part 1 connected to the pipe; the other end has a three-step structure with decreasing outer diameters, the largest outer diameter part is step 1, the axial surface of the second step is provided with an external thread 1, and the third step is a conical step, and the axial surface is provided with a sealing conical thread;

[0007] Part 2: The central circular through hole is provided with a connecting internal thread matching the second step external thread of part 1;

[0008] Component three: One end of the cylindrical pipe fitting has a pipe connection part 2 connected to the pipe; the other end has a two-level step structure with successively decreasing outer diameters, the largest outer diameter part is step 2, and the axial surface of the second step is provided with external thread 2, which is arranged in the same manner as external thread 1 of component one and matches the internal thread connecting component two, and the inner wall of the second step of component three is provided with internal thread 2 matching the sealing cone thread of component one.

[0009] The outer cross-sectional profiles of the step 1 and the step 2 are regular polygons. The outer cross-sectional profiles of the step 1 and the step 2 are regular hexagons.

[0010] The rotation direction of the outer sleeve connection thread group formed by combining component one or component three with component two of the present invention is opposite to the rotation direction of the sealing cone connection thread group formed by combining the sealing cone thread of component one with the internal thread two of component three.

[0011] The outer cross-sectional profile of the second component is a regular hexagon.

[0012] The component one and the component three are connected and fixed to the pipeline via a nut set.

[0013] The benefits of the invention: The connecting joint of the invention adopts a split thread structure, and the thread engagement length can be flexibly adjusted according to the spacing of the steel pipes, thereby realizing the variable function of the joint body and ensuring that the end face of the pipe is always in good contact with the inner end face of the joint. At the same time, the inner thread adopts a sealing cone thread to increase the sealing performance. The sealing cone thread group and the outer sleeve thread group have opposite rotation directions, which ensures the stability of the components after installation and eliminates leakage hazards. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the cross-sectional structure of the joint assembly state of the present invention;

[0015] Figure 2 It is a schematic diagram of a cross-sectional structure of a joint component of the present invention;

[0016] Figure 3 It is a schematic diagram of the cross-sectional structure of the second joint component of the present invention;

[0017] Figure 4 1. It is a schematic diagram of the structure of three cross sections of the joint component of the present invention;

[0018] Figure 5 This is a schematic diagram of the cross-sectional structure of the joint connection step A of the present invention;

[0019] Figure 6 It is a schematic diagram of the cross-sectional structure of the joint connection arrangement B state of the present invention;

[0020] Figure 7 It is a schematic diagram of the cross-sectional structure of the joint connection arrangement in the C state of the present invention.

[0021] In the figure, 1 is component one, 2 is component two, 3 is component three, 1.1 is external thread one, 1.2 is sealing cone thread, 1.3 is step one, 1.4 is pipe connection part one, 2.1 is connecting internal thread, 3.1 is internal thread two, 3.2 is external thread two, 3.3 is step two, 3.4 is pipe connection part two, 4.1 is outer sleeve connecting thread group, 4.2 is sealing cone connecting thread group, G is pipe, and J is gap. DETAILED DESCRIPTION

[0022] The present invention is further described below in conjunction with specific implementation methods. The specific implementation methods are further descriptions of the principles of the present invention and do not limit the present invention in any way. Technologies that are the same or similar to the present invention do not exceed the scope of protection of the present invention.

[0023] Combined with the attached pictures.

[0024] An adjustable pipe connection joint, the connection joint is used to connect a cylindrical pipe G, including a cylindrical pipe component 1 and a component 3 connected and fixed to the two ends of the connecting pipe G, and also includes a component 2 2 whose outer cross-sectional profile is a regular polygon and whose center is a circular through hole;

[0025] Component 1: One end of the cylindrical pipe fitting has a pipe connection part 1.4 connected to the pipe; the other end has a three-step structure with decreasing outer diameters, the largest outer diameter part is step 1.3, the axial surface of the second step is provided with an external thread 1.1, the third step is a conical step, and the axial surface is provided with a sealing conical thread 1.2;

[0026] Component 2 2: The central circular through hole is provided with a connecting internal thread 2.1 matching with the second step external thread 1.1 of component 1;

[0027] Component three 3: One end of the cylindrical pipe fitting has a pipe connecting portion 2 3.4 connected to the pipe; the other end has a two-stage step structure with successively decreasing outer diameters, the maximum outer diameter portion being step 2 3.3, an external thread 2 3.2 is arranged on the axial surface of the second step, the external thread 2 3.2 is arranged identically to the external thread 1.1 of component one 1 and matches the internal thread 2.1 of component two 2, an internal thread 2 3.1 matching the sealing cone thread 1.2 of component one 1 is arranged on the inner wall of the second step of component three 3.

[0028] The outer cross-sectional profiles of step 1.3 and step 2.3 are regular polygons, which are regular hexagons in this example.

[0029] The rotation direction of the outer sleeve connection thread group 4.1 formed by the combination of component 1 or component 3 3 and component 2 2 of the present invention is opposite to the rotation direction of the sealing cone connection thread group 4.2 formed by the combination of the sealing cone thread 1.2 of component 1 1 and the internal thread 2 3.1 of component 3 3 .

[0030] The outer cross-sectional profile of component 2 is a regular hexagon.

[0031] Component 1 and component 3 are connected and fixed to the pipe G through a nut set. The nut set connection includes a screw-on connection structure with a buckle edge, or a screw-on connection structure with an extrusion screw.

[0032] Combined with Figure 5 , Figure 6 and Figure 7 When connecting and installing pipe G, it is pointed out that due to factors such as cutting or on-site installation environment, there are certain connection size differences between the two pipes, such as Figure 5 As shown, there is a certain gap J between the right end pipe G and the inner step of the pipe connection part 2 3.4 of the joint component 3. The screwing component 1 screws the component 3 3 until the pipe G is fixed with the gap J eliminated. Figure 6 After the adjustment is completed, screw the component 1 together so that the sealing cone thread 1.2 is combined with the internal thread 2 3.1 of the component 3 to achieve connection and sealing, and then screw the component 2 2 together with the external thread 1.1 of the component 1 and contact and tighten with the step 1.3 to complete the installation.

Claims

1. An adjustable pipeline connection joint, the connection joint is used to connect a cylindrical pipe, comprising a cylindrical pipe part 1 and a part 3 connected and fixed to the pipes at both ends, characterized in that: Also included is a component 2 having an outer cross-sectional profile of a regular polygon and a circular through hole at the center; Component 1: One end of the cylindrical pipe fitting has a pipe connection part 1 connected to the pipe; the other end has a three-step structure with decreasing outer diameters, the largest outer diameter part is step 1, the axial surface of the second step is provided with an external thread 1, and the third step is a conical step, and the axial surface is provided with a sealing conical thread; Part 2: The central circular through hole is provided with a connecting internal thread matching the second step external thread of part 1; Component 3: One end of the cylindrical pipe fitting has a pipe connection part 2 connected to the pipe; the other end has a two-stage step structure with decreasing outer diameters, the largest outer diameter part is step 2, the axial surface of the second step is provided with external thread 2, the external thread 2 is arranged in the same manner as the external thread 1 of component 1 and matches the internal thread connected to component 2, and the inner wall of the second step of component 3 is provided with internal thread 2 matching the sealing cone thread of component 1; The rotation direction of the outer sleeve connection thread group formed by the combination of component one or component three and component two is opposite to the rotation direction of the sealing cone connection thread group formed by the combination of the sealing cone thread of component one and the internal thread two of component three; the pipe connecting part one and the pipe connecting part two have an inner connection step. When the pipe is inserted into the pipe connecting part one and the pipe connecting part two, there is a gap between the right end pipe and the inner step of the pipe connecting part two. The gap can be eliminated by driving the screwing component three through the screwing component one, and then the sealing cone thread is combined with the internal thread two of component three through the screwing component one to achieve connection and sealing, and then the screwing component two is combined with the external thread one of component one and contacted with the step one to be tightened.

2. The adjustable pipe connection joint according to claim 1, characterized in that: The outer cross-sectional profiles of the step 1 and the step 2 are regular polygons.

3. The adjustable pipe connection joint according to claim 2, characterized in that: The outer cross-sectional profiles of the step 1 and the step 2 are regular hexagons.

4. The adjustable pipe connection joint according to claim 1, 2 or 3, characterized in that: The outer cross-sectional profile of the second component is a regular hexagon.

5. The adjustable pipe connection joint according to claim 1, 2 or 3, characterized in that: The component one and the component three are connected and fixed to the pipeline via a nut set.

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