Stainless steel insert pipe joint

Abstract

The utility model provides a stainless steel insert pipe joint, belongs to the technical field of connecting pipe joints, and solves the problems that an existing pipe joint is poor in structural stability and high in cost. The stainless steel insert pipe joint comprises a barrel-shaped stainless steel insert and a barrel-shaped plastic sleeve, the sleeve is arranged on the insert in a sleeving mode and connected with the insert in a sealed mode, the insert comprises a connecting part and a fastening part connected with the sleeve in a sealed mode, the connecting part extends out of the end face of the sleeve, and the fastening part is connected with the sleeve in a sealed mode. The connecting part and the fastening part are connected to form an annular reinforcing part, the reinforcing part comprises a first abutting face and a second abutting face, and the first abutting face and the second abutting face abut against the end face and the inner side wall of the external member respectively. The stainless steel insert pipe joint not only ensures the structural stability of the pipe joint, but also reduces the cost.

Description

Technical Field

[0001] The utility model belongs to the technical field of connecting pipe joints and relates to a stainless steel insert pipe joint. Background Art

[0002] Pipeline transportation refers to a mode of transportation that uses pipelines as a means of transportation to transport liquid and gas materials over long distances. Pipelines are devices connected by pipes, pipe joints, and valves for transporting gas, liquid, or fluids with solid particles. Pipe joints, also called pipe fittings, provide an interface that allows different pipes to be connected together by inserting the pipes into the pipe joints and connecting the ends of the pipe joints to the ends of another pipe joint.

[0003] Pipes are widely used in different environments. When pipes are placed outdoors for a long time, they will fade, age, and have poor UV resistance.

[0004] To this end, a Chinese patent application (application number: 201320173084.X) discloses a special solar tube, including a copper insert and a plastic part that are injection molded at one time. The plastic part covers the outside of the copper insert. The copper insert is provided with three grooves, one of which is provided with a rubber sealing ring.

[0005] However, the above method has the following defects: the end face of the copper insert and the end face of the plastic part are flush and together constitute the end face of the pipe fitting, that is, the contact surface of the copper insert and the plastic part extends to the end face of the pipe fitting, and the coefficients of thermal expansion and contraction of metal and plastic are different. Under the influence of alternating hot and cold, the copper insert and the plastic part expand or contract to varying degrees. Due to the different degrees of deformation in the radial direction, the contact surface between the copper insert and the plastic part is prone to cracks due to stress concentration. At the same time, due to the different degrees of deformation in the axial direction, the end faces of the copper insert and the plastic part may have a height difference, which can easily affect the sealing and flatness of the end face of the pipe fitting, thereby affecting the tightness and stability of the pipeline, requiring frequent repairs or replacements, and high costs. Utility Model Content

[0006] The purpose of the utility model is to solve the above problems in the prior art and propose a stainless steel insert pipe joint. The technical problem to be solved by the utility model is: how to ensure the structural stability of the pipe joint and reduce the cost.

[0007] The purpose of the utility model can be achieved through the following technical solutions: a stainless steel insert pipe joint, comprising a cylindrical stainless steel insert and a cylindrical plastic sleeve, the sleeve is sleeved on the insert, and the sleeve is sealed and connected to the insert, the insert comprises a connecting portion and a fastening portion sealed and connected to the sleeve, the connecting portion extends out of the end face of the sleeve, the connecting portion is connected to the fastening portion and forms an annular reinforcement portion, the reinforcement portion comprises a first abutment surface and a second abutment surface, the first abutment surface and the second abutment surface are respectively pressed against the end face and the inner wall of the sleeve.

[0008] The stainless steel insert pipe joint includes a stainless steel insert and a plastic set formed by one-time injection molding. Both the insert and the set are in the shape of a cylinder. The insert includes a connecting portion and a fastening portion. The set is sleeved on the fastening portion and is sealed and connected to the fastening portion. The connecting portion is connected to the fastening portion and forms a ring-shaped reinforcement portion. The reinforcement portion includes a first abutment surface and a second abutment surface. The first abutment surface is in the shape of a circular ring, and the second abutment surface is in the shape of a cylinder. The first abutment surface and the second abutment surface are respectively pressed against the end face and the inner wall of the set, and cooperate with the fastening of the fastening portion and the set to jointly realize the sealed connection between the insert and the set. The connecting portion extends out of the end face of the set, that is, the insert extends out of the end face of the set. The end face of the insert is the end face of the pipe joint. The end face of the pipe joint is made of the same material. The coefficients of thermal expansion and contraction of the same material are the same. Under the influence of alternating hot and cold, the degree of expansion or contraction is basically the same, and cracks are not easy to appear, which avoids affecting the flatness of the end face of the pipe joint, ensures the stability of the pipe joint structure, does not require frequent maintenance or replacement, and has low cost. Under the influence of alternating hot and cold, the insert and the set expand or contract to different degrees. The reinforcement part provides a gradually transitioning contact interface. The abutment surface 1 and the abutment surface 2 are respectively pressed against the end face and the inner wall of the set, which can reduce the concentration of stress. Compared with the flat direct contact surface, the stress concentration caused by thermal expansion, mechanical stress or other factors is greatly reduced, thereby reducing the possibility of crack formation. The plastic set is used to wrap the stainless steel insert. The plastic can effectively protect the internal stainless steel from corrosion, and there is no need for frequent maintenance or replacement. The cost is low. At the same time, the end of the pipe joint used for connection is stainless steel, which has excellent corrosion resistance, high strength and excellent wear resistance, etc., so that the pipe joint can adapt to humid, corrosive or long-term exposure environments, and also makes the pipe joint have good tensile strength and impact resistance. It also enables the pipe joint to resist wear and surface scratches, which is conducive to ensuring the structural stability of the pipe joint.

[0009] In the above-mentioned stainless steel insert pipe joint, the diameter of the outer wall of the connection part is larger than the diameter of the outer wall of the fastening part. The end diameter of the pipe joint is larger than the diameter of the pipe joint body, which can provide a larger connection area and stronger mechanical support, which is conducive to ensuring that the connection point will not be easily broken or loosened due to stress concentration, especially under high pressure or high flow conditions, which is conducive to ensuring the structural stability of the pipe joint.

[0010] In the above-mentioned stainless steel insert pipe joint, the outer wall of the connection part close to the fastening part shrinks inward to form a clearance section, the clearance section is connected to the fastening part and forms a reinforcement part, the diameter of the outer wall of the clearance section is smaller than the diameter of the outer wall of the end of the sleeve, and the outer wall of the clearance section and the end face of the sleeve form a clearance space. Stainless steel and plastic have different thermal expansion coefficients, and the connection between the stainless steel insert and the plastic sleeve forms a clearance space to avoid damage caused by stress concentration due to thermal expansion and contraction. In addition, the clearance space reserved at the connection leaves working space for operations such as installation, maintenance and disassembly of the pipe joint, making the installation and maintenance of the pipe joint more convenient.

[0011] The above-mentioned stainless steel insert pipe joint, the connection part also includes a transition section and a connection section, the transition section is connected to the connection section and the clearance section respectively, and the outer side surface of the transition section is a conical surface with the small end facing the clearance section. The outer side wall of the transition section forms an obtuse angle with the outer side wall of the connection section, and the outer side wall of the transition section also forms an obtuse angle with the outer side wall of the clearance section. The obtuse angle transition can reduce the possibility of stress concentration caused by the sudden change of geometric shape, which is beneficial to ensure the strength of the pipe joint and the structural stability of the pipe joint.

[0012] The diameter of the outer wall of the transition section increases gradually from the yield section to the connection section. By tilting the outer wall of the transition section, the outer wall of the connection section and the outer wall of the yield section can be arranged parallel to each other and can respectively transition with the outer wall of the transition section at an obtuse angle.

[0013] Compared with the prior art, this stainless steel insert pipe joint has the following advantages:

[0014] 1. In the stainless steel insert pipe joint, the insert end face is the pipe joint end face, and the pipe joint end face is made of the same material. The coefficient of thermal expansion and contraction of the same material is the same. Under the influence of alternating hot and cold, the degree of expansion or contraction is basically the same, and cracks are not easy to appear, which avoids affecting the flatness of the pipe joint end face, ensures the stability of the pipe joint structure, does not need frequent maintenance or replacement, and has low cost.

[0015] 2. In the stainless steel insert pipe joint, under the influence of alternating hot and cold, the insert and the set expand or contract to varying degrees. The reinforcement portion provides a gradually transitioning contact interface, and the abutment surface 1 and the abutment surface 2 are respectively pressed against the end face and the inner wall of the set, which can reduce stress concentration. Compared with a flat direct contact surface, the stress concentration caused by thermal expansion, mechanical stress or other factors is greatly reduced, thereby reducing the possibility of crack formation.

[0016] 3. In this stainless steel insert pipe joint, a plastic kit is used to wrap the stainless steel insert. The plastic can effectively protect the internal stainless steel from corrosion, and there is no need for frequent maintenance or replacement, which is low in cost. At the same time, the end of the pipe joint used for connection is stainless steel, which has excellent corrosion resistance, high strength and excellent wear resistance, etc., so that the pipe joint can adapt to humid, corrosive or long-term exposure environments, and also makes the pipe joint have good tensile strength and impact resistance, and also makes the pipe joint able to resist wear and surface scratches, which is conducive to ensuring the structural stability of the pipe joint. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a cross-sectional view of the stainless steel insert pipe joint.

[0018] Figure 2 yes Figure 1 A partial enlarged view of point A in the middle.

[0019] In the figure, 1, insert; 1a, connecting part; 1a1, make way section; 1a2, transition section; 1a3, connecting section; 1b, fastening part; 2, kit; 3, reinforcement part; 3a, abutment surface 1; 3b, abutment surface 2; 4, make way space. DETAILED DESCRIPTION

[0020] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

[0021] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways, but they will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

[0022] like Figure 1 and Figure 2 As shown, the stainless steel insert pipe joint comprises a stainless steel insert 1 and a plastic set 2 which are formed by one-time injection molding, and both the insert 1 and the set 2 are in a cylindrical shape.

[0023] Stainless steel has excellent corrosion resistance, high strength and excellent wear resistance, etc., which enables the pipe joints to adapt to humid, corrosive or long-term exposure environments, and also enables the pipe joints to have good tensile strength and impact resistance. It also enables the pipe joints to resist wear and surface scratches, which is beneficial to ensure the structural stability of the pipe joints.

[0024] The insert 1 includes a connecting portion 1a and a fastening portion 1b, the connecting portion 1a and the fastening portion 1b are connected, and the connecting portion 1a extends out of the end face of the set 2, that is, the insert 1 extends out of the end face of the set 2. The end face of the connecting portion 1a is the end face of the insert 1 and is also the end face of the pipe joint. The set 2 is sleeved on the fastening portion 1b and is sealed with the fastening portion 1b. The diameter of the outer wall of the connecting portion 1a is greater than the diameter of the outer wall of the fastening portion 1b. The end diameter of the pipe joint is greater than the diameter of the pipe joint body, which can provide a larger connection area and stronger mechanical support, which is conducive to ensuring that the connection point will not be easily broken or loosened due to stress concentration, especially under high pressure or high flow conditions, which is conducive to ensuring the structural stability of the pipeline pipe joint.

[0025] Specifically, a groove is provided on the fastening portion 1b, a sealing ring is provided in the groove, and the sleeve 2 and the fastening portion 1b form a fastening structure and clamp the sealing ring to form a seal.

[0026] The outer wall of the connecting portion 1a close to the fastening portion 1b shrinks inward to form a giving section 1a1, and the giving section 1a1 is connected to the fastening portion 1b and forms a ring-shaped reinforcement portion 3. The reinforcement portion 3 includes a supporting surface 1 3a and a supporting surface 2 3b. The supporting surface 1 3a is annular, and the supporting surface 2 3b is cylindrical. The supporting surface 1 3a and the supporting surface 2 3b are respectively tightly pressed against the end face and the inner wall of the set 2, and cooperate with the fastening of the fastening portion 1b and the set 2 to jointly realize the sealed connection between the insert 1 and the set 2.

[0027] The diameter of the outer wall of the clearance section 1a1 is smaller than the diameter of the outer wall of the end of the sleeve 2, and the outer wall of the clearance section 1a1 and the end face of the sleeve 2 form a clearance space 4. Stainless steel and plastic have different thermal expansion coefficients, and the connection between the stainless steel insert 1 and the plastic sleeve 2 forms a clearance space 4 to avoid damage caused by stress concentration due to thermal expansion and contraction. In addition, the clearance space 4 at the connection leaves working space for the installation, maintenance and disassembly of the pipe joint, making the installation and maintenance of the pipe joint more convenient.

[0028] The connecting portion 1a also includes a transition section 1a2 and a connecting section 1a3. The transition section 1a2 is connected to the connecting section 1a3 and the giving section 1a1 respectively, and the diameter of the outer wall of the transition section 1a2 gradually increases from the giving section 1a1 to the connecting section 1a3. Specifically, the outer side surface of the transition section 1a2 is a conical surface with the small end facing the giving section 1a1, that is, the outer wall of the transition section 1a2 forms an obtuse angle with the outer wall of the connecting section 1a3, and the outer wall of the transition section 1a2 also forms an obtuse angle with the outer wall of the giving section 1a1. By tilting the outer wall of the transition section 1a2, the outer wall of the connecting section 1a3 and the outer wall of the giving section 1a1 can be arranged parallel to each other and can respectively transition to the outer wall of the transition section 1a2 at an obtuse angle. The obtuse angle transition can reduce the possibility of stress concentration caused by the sudden change of geometric shape, which is beneficial to ensure the strength of the pipe joint and the structural stability of the pipe joint.

[0029] The end face of the insert 1 is the end face of the pipe joint. The end face of the pipe joint is made of the same material. The coefficients of thermal expansion and contraction of the same material are the same. Under the influence of alternating hot and cold, the degree of expansion or contraction is basically the same, and cracks are not easy to appear, avoiding affecting the flatness of the end face of the pipe joint, ensuring the stability of the pipe joint structure, and no frequent maintenance or replacement is required, which is low in cost. Under the influence of alternating hot and cold, the insert 1 and the set 2 expand or contract to different degrees. The reinforcement part 3 provides a gradually transitioning contact interface. The abutment surface 1 3a and the abutment surface 2 3b are respectively pressed against the end face and the inner wall of the set 2, which can reduce stress concentration. Compared with a flat direct contact surface, the stress concentration caused by thermal expansion, mechanical stress or other factors is greatly reduced, thereby reducing the possibility of crack formation. The plastic kit 2 is used to wrap the stainless steel insert 1. The plastic can effectively protect the internal stainless steel from corrosion, and there is no need for frequent maintenance or replacement, which is low in cost. At the same time, the end of the pipe joint used for connection is stainless steel, which has excellent corrosion resistance, high strength and excellent wear resistance, etc., so that the pipe joint can adapt to humid, corrosive or long-term exposure environments, and also makes the pipe joint have good tensile strength and impact resistance, and can also make the pipe joint resist wear and surface scratches, which is conducive to ensuring the structural stability of the pipe joint.

[0030] Although the terms such as insert 1, connecting portion 1a, clearance section 1a1, transition section 1a2, connecting section 1a3, fastening portion 1b, set 2, fastening portion 3, abutting surface 1 3a, abutting surface 2 3b, and clearance space 4 are frequently used in this article, the possibility of using other terms is not excluded. The use of these terms is only for the purpose of more conveniently describing and explaining the essence of the utility model; interpreting them as any additional restrictions is contrary to the spirit of the utility model.

Claims

1. A stainless steel insert pipe joint, comprising a cylindrical stainless steel insert (1) and a cylindrical plastic sleeve (2), wherein the sleeve (2) is sleeved on the insert (1), and the sleeve (2) is sealed and connected to the insert (1), characterized in that: The insert (1) comprises a connecting portion (1a) and a fastening portion (1b) sealed with the sleeve (2); the connecting portion (1a) extends out of the end face of the sleeve (2); the connecting portion (1a) is connected to the fastening portion (1b) and forms an annular reinforcing portion (3); the reinforcing portion (3) comprises a first abutting surface (3a) and a second abutting surface (3b); the first abutting surface (3a) and the second abutting surface (3b) are respectively tightly abutted against the end face and the inner wall of the sleeve (2).

2. A stainless steel insert pipe joint according to claim 1, characterized in that: The diameter of the outer side wall of the connecting portion (1a) is greater than the diameter of the outer side wall of the fastening portion (1b).

3. A stainless steel insert pipe joint according to claim 1 or 2, characterized in that: The outer wall of the connecting portion (1a) close to the fastening portion (1b) shrinks inward to form a clearance section (1a1), the clearance section (1a1) is connected to the fastening portion (1b) and forms a reinforcement portion (3), the diameter of the outer wall of the clearance section (1a1) is smaller than the diameter of the outer wall of the end of the sleeve (2), and the outer wall of the clearance section (1a1) and the end surface of the sleeve (2) form a clearance space (4).

4. A stainless steel insert pipe joint according to claim 3, characterized in that: The connecting portion (1a) further comprises a transition section (1a2) and a connecting section (1a3); the transition section (1a2) is respectively connected to the connecting section (1a3) and the relinquishing section (1a1); and the outer side surface of the transition section (1a2) is a conical surface with the small end facing the relinquishing section (1a1).

5. A stainless steel insert pipe joint according to claim 4, characterized in that: The diameter of the outer side wall of the transition section (1a2) gradually increases from the clearance section (1a1) to the connecting section (1a3).

Images