Semi-hard low-pressure fluid pipe fastening and sealing joint

Abstract

The invention discloses a semi-hard low-pressure fluid pipe fastening sealing joint, which relates to the field of low-pressure fluid pipe joints, and comprises an external connecting body, a fluid pipe, a lining pipe, a spring and a shell, the outer diameter of the opening of the fluid pipe is elastically restrained through the spring, and the inner diameter of the opening of the fluid pipe is restrained through the lining pipe. The spring thread body jointly composed of the spring and the fluid pipe is matched with the inner threaded hole in the bottom of the shell to achieve fixed connection of the fluid pipe and the shell, sealing of the semi-hard fluid pipe and the lining pipe is achieved through prestress of the spring, the problem of liquid leakage caused by creep and looseness of the semi-hard fluid pipe connector is solved, and the connector has the advantages of being simple in structure, saving materials, reducing cost and the like. The cost is low; the safety and durability are realized.

Description

Technical Field

[0001] The present application belongs to the field of low-pressure fluid pipe joints, and in particular, relates to a semi-rigid low-pressure fluid pipe fastening and sealing joint. Background Art

[0002] The commonly used method for existing semi-rigid low-pressure fluid pipe joints is a quick-twist joint, which compresses the fluid pipe and the quick-twist joint port by screwing to achieve compression and sealing. The quick-twist joint is large in size and high in cost, and is prone to loosening and leakage due to creep of the fluid pipe.

[0003] The second commonly used method for existing semi-rigid low-pressure fluid pipe joints is to set a joint spring at the end of the fluid pipe to achieve sealing through pre-pressure, and to constrain the fluid delivery section of the fluid pipe and the connected object through a third object to ensure the axial relative position of the fluid pipe and the connected object. The constrained fluid pipe part is prone to deformation, necking and creep, resulting in fluid pressure loss at this part and loosening and collapse of the fluid pipe.

[0004] The third commonly used method for existing semi-rigid low-pressure fluid pipe joints is to make a flange at the end of the fluid pipe and form it into a whole with the fluid pipe by cold pressing, which is costly and difficult to repair on site. Summary of the invention

[0005] The purpose of the present application is to provide a semi-rigid low-pressure fluid pipe joint.

[0006] In order to achieve the purpose of this application, the following technical solutions are provided: A rod bending joint comprises: an external body, a fluid tube, an inner liner tube, a spring, and a shell. The inner liner tube comprises a sealing end and an inner liner end. The outer diameter of the inner liner end is greater than or equal to the inner diameter of the fluid tube. The inner liner end is inserted into the fluid tube to constrain the inner diameter of the fluid tube orifice. The sealing end is sealed and connected to the external body. The spring comprises a locking section, a threaded section and a tail section. The locking section pitch is smaller than the threaded section pitch. Both ends of the spring comprise a flat section. The number of turns of the flat section is not less than 0.6. The spring locking section is installed near the orifice of the fluid tube. The spring locking end is used to elastically constrain the outer diameter of the orifice of the fluid tube. The threaded section and the fluid tube form a spring threaded body. The shell has a cup-shaped countersunk hole and an internal threaded hole in the middle. The internal threaded hole is arranged at the bottom. The pitch of the internal threaded hole is the same as the pitch of the spring threaded end. The fluid tube and the shell are fixedly connected in a threaded manner through the spring threaded body and the internal threaded hole. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] Figure 1 This is a schematic diagram of a semi-rigid low-pressure fluid pipe joint according to Example 1 of the present invention; Figure 2 This is an assembly diagram of a semi-rigid low-pressure fluid pipe joint according to embodiment 1 of the present invention; In the figure, 1 is a shell; 2 is a spring; 3 is a fluid tube; 4 is an inner liner tube; 5 is an external body. DETAILED DESCRIPTION

[0008] As required, detailed embodiments of the present invention are disclosed herein, but it should be understood that the disclosed embodiments are only exemplary of the present invention, and the present invention may be implemented in different and alternative forms. The drawings are not necessarily drawn to scale, and certain features may be exaggerated or reduced to show the details of specific components. Therefore, the specific structural and functional details disclosed herein should not be understood as having a limiting meaning, but only as a representative basis to teach those skilled in the art to adopt the present invention differently. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in the field without making creative work are within the scope of protection of the present invention.

[0009] Example 1: Figure 1 As shown, a semi-rigid low-pressure fluid pipe joint comprises: an external body (5), a fluid pipe (3), an inner liner pipe (4), a spring (2), and a shell (1). The inner liner pipe (4) comprises: a sealing end and an inner liner end. The outer diameter of the inner liner end is greater than or equal to the inner diameter of the fluid pipe (3). The inner liner end is inserted into the fluid pipe (3) to constrain the inner diameter of the pipe opening of the fluid pipe (3). The sealing end is sealed and connected to the external body (5). The spring (2) comprises a locking section, a threaded section and a tail section. The thread pitch of the locking section is less than the thread pitch of the threaded section. Both ends of the spring (2) comprise a flat section. The number of turns of the flat section is not less than 0.6. The spring (2) locks The mouth section is installed near the mouth of the fluid tube (3); the locking end of the spring (2) is used to elastically constrain the outer diameter of the mouth of the fluid tube (3); the threaded section and the fluid tube (3) form a spring threaded body; the middle of the shell (1) includes a cup-shaped countersunk hole and an internal threaded hole; the internal threaded hole is arranged at the bottom; the pitch of the internal threaded hole is the same as the pitch of the threaded end of the spring (2); the fluid tube (3) and the shell (1) are fixedly connected in a threaded manner through the spring threaded body and the internal threaded hole; the shell (1) is fixedly connected to the external body (5) by a screw-on method; and the sealing end of the liner tube (4) and the external body (5) are sealed and connected.

Claims

1. A semi-rigid low-pressure fluid pipe fastening sealing joint, characterized in that: include: An external body (5), a fluid pipe (3), an inner liner pipe (4), a spring (2), and a shell (1). The inner liner pipe (4) comprises: a sealing end and an inner liner end. The outer diameter of the inner liner end is greater than or equal to the inner diameter of the fluid pipe (3). The inner liner end is inserted into the fluid pipe (3) to constrain the inner diameter of the pipe opening of the fluid pipe (3). The sealing end is sealed and connected to the external body (5). The spring (2) comprises a locking section, a threaded section, and a tail section. The thread pitch of the locking section is less than the thread pitch of the threaded section. Both ends of the spring (2) include a flat section, and the number of turns of the flat section is not less than 0.

6. The locking section of the spring (2) is installed near the pipe opening of the fluid pipe (3). The locking end of the spring (2) is used to elastically constrain the outer diameter of the pipe opening of the fluid pipe (3). The threaded section and the fluid pipe (3) form a spring threaded body. The middle of the shell (1) includes a cup-shaped countersunk hole and an internal threaded hole. The internal threaded hole is arranged at the bottom. The pitch of the internal threaded hole is the same as the pitch of the threaded end of the spring (2). The fluid pipe (3) and the shell (1) are fixedly connected in a threaded manner through the spring threaded body and the internal threaded hole.

2. The inner liner pipe (4) according to claim 1, characterized in that : The inner lining pipe (4) is a rigid pipe that is not easily deformed.

3. The housing (1) according to claim 1, characterized in that The shell (1) is fixedly connected to the external connecting body (5) or to the inner lining tube (4), and the inner lining tube (4) is fixedly connected to the shell (1) to prevent the occurrence of tube collapse.

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