Clamping and pressing type direct stainless steel pipe fitting

Abstract

The utility model discloses a clamping and pressing type direct stainless steel pipe fitting which comprises a compression joint deformation section and an external thread connector, a clamping groove protruding outwards is formed in the inner wall of the compression joint deformation section in the circumferential direction, a sealing ring is movably installed in the clamping groove, and a buffering section, a vibration reduction section and a connecting section are arranged between the compression joint deformation section and the external thread connector. The buffering section is arranged between the compression joint deformation section and the vibration reduction section, the connecting section is arranged between the vibration reduction section and the external thread connector, and the vibration reduction section is in a corrugated pipe shape. According to the utility model, the buffer section and the vibration reduction section are arranged between the crimping deformation section and the connecting section, the buffer section provides enough deformation distance for the crimping deformation section, the crimping stability is ensured, and the corrugated pipe-shaped vibration reduction section can allow the pipe fitting to stretch out and draw back slightly and bend slightly, so that the service life of the pipe fitting is prolonged. Therefore, the vibration deformation part is transferred from the compression joint deformation section to the vibration reduction section which is easier to deform, the effect of protecting pipe fitting connection is achieved, and the stability and the sealing performance of the whole structure are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of stainless steel pipe fittings, in particular to a compression type direct stainless steel pipe fitting. Background Art

[0002] Compression-type direct stainless steel pipe fittings are a commonly used thin-walled pipe connection fittings. They are stainless steel straight pipes and are connected by compression, hence the name. Compression-type direct stainless steel pipe fittings can be used to connect water pipes, gas pipes, instruments, etc., and are becoming more and more popular due to their simple connection operation.

[0003] The compression type direct stainless steel pipe fittings are mainly composed of a pipe body, a groove on the pipe body and a sealing ring in the groove. When connecting, the pipe fitting is slowly sleeved onto the stainless steel pipe to be connected along the axial direction, and then the parts of the pipe fitting located on both sides of the groove and the stainless steel pipe inside the corresponding position are squeezed into a hexagon through hydraulic pliers, so that the sealing gasket shrinks radially to complete the installation, connection and sealing of the pipe fitting.

[0004] It is not difficult to see that after the installation, the connection strength of the entire pipe fitting and pipeline is relatively weak at the parts of the pipe fitting located on both sides of the slot. During the long-term use of the pipeline to transport fluid, the rigid stainless steel pipe is easily vibrated by the water hammer effect. The long-term vibration phenomenon is likely to cause additional deformation at the position of extrusion deformation, thereby affecting the sealing effect and structural stability. In order to ensure the long-term safe use of the pipeline, a new type of compression type direct stainless steel pipe fitting is designed. Utility Model Content

[0005] In view of the shortcomings of the prior art, the utility model provides a compression type direct stainless steel pipe fitting, which is used to solve the problem that the existing compression type direct stainless steel pipe fittings may cause additional deformation at the extrusion deformation position due to long-term vibration during long-term use, affecting the sealing effect and structural stability.

[0006] In order to solve the above technical problems, the utility model provides the following technical solutions:

[0007] A compression type direct stainless steel pipe fitting comprises a compression deformation section and an external thread joint, wherein the inner wall of the compression deformation section is circumferentially provided with a clamping groove protruding outward, a sealing ring is movably installed inside the clamping groove, a buffer section, a vibration reduction section and a connecting section are provided between the compression deformation section and the external thread joint, the buffer section is provided between the compression deformation section and the vibration reduction section, the connecting section is provided between the vibration reduction section and the external thread joint, and the vibration reduction section is in the shape of a corrugated tube.

[0008] Preferably, the crimping deformation section, the clamping groove, the buffer section, the vibration reduction section, the connecting section and the external thread connector are an integrated structure.

[0009] Preferably, the buffer section has the same inner and outer diameters as the crimping deformation section, the length of the buffer section is not less than half the length of the crimping deformation section on one side of the slot, and the inner and outer diameters of the connecting section are not greater than the inner and outer diameters of the buffer section.

[0010] Preferably, the inner diameter of the sealing ring is smaller than the inner diameter of the crimping deformation section.

[0011] Preferably, the outer wall of the sealing ring is provided with circumferential anti-skid grooves around the circumference at equal intervals, and the circumferential inner wall of the sealing ring is provided with deformation grooves parallel to the axis at equal intervals.

[0012] Preferably, the corrugated tube-shaped vibration-damping section comprises at least one wave crest and wave trough structure.

[0013] Compared with the prior art, the utility model has the following beneficial effects:

[0014] 1. The utility model provides a buffer section and a vibration-damping section between the crimping deformation section and the connecting section. The cross section of the pipe is deformed from a circular shape into a hexagonal structure by extrusion. There is a gradual shape change phenomenon between the extruded and unextruded parts. The buffer section gives the crimping deformation section enough deformation distance to ensure the stability of the crimping, and increases the distance between the crimping deformation section and the vibration-damping section to prevent the cross-sectional shape of the vibration-damping section from changing. The corrugated tube-shaped vibration-damping section structure allows the pipe to expand and contract a small amount and also allows a small amount of bending, thereby transferring the vibration deformation part from the crimping deformation section to the vibration-damping section that is more easily deformed, thereby protecting the connection of the pipe fittings, improving the overall structural stability and sealing, and solving the problem that the existing compression-type direct stainless steel pipe fittings have additional deformation at the extrusion deformation position due to long-term vibration during long-term use, affecting the sealing effect and structural stability.

[0015] 2. The outer wall of the sealing ring of the utility model is provided with a circumferential anti-skid groove and the inner wall is provided with an axial deformation groove. When the stainless steel pipe to be connected is inserted into the pipe fitting, it contacts and rubs with the sealing ring. The circumferential anti-skid groove can increase the friction between the sealing ring and the inner wall of the groove to prevent the sealing ring from twisting and deforming to affect the sealing effect. The deformation groove can reduce the contact area of ​​the stainless steel pipe insertion, thereby reducing the friction and facilitating smooth insertion, and at the same time can facilitate the synchronous radial contraction of the entire circle of the sealing ring, with consistent deformation, thereby improving the sealing effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0017] Figure 2 It is a front cross-sectional view of the utility model;

[0018] Figure 3 This is a front view of the sealing ring of the utility model;

[0019] Figure 4 It is a front cross-sectional view of the sealing ring of the utility model.

[0020] In the figure: 1. crimping deformation section; 2. external thread connector; 3. clamping groove; 4. sealing ring; 41. circumferential anti-skid groove; 42. deformation groove; 5. buffer section; 6. vibration reduction section; 7. connection section. DETAILED DESCRIPTION

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

[0022] like Figure 1-4 As shown, the utility model provides a technical solution: a crimping type direct stainless steel pipe fitting, comprising a crimping deformation section 1 and an external thread joint 2, the inner wall of the crimping deformation section 1 is circumferentially provided with a card groove 3 protruding outward, a sealing ring 4 is movably installed inside the card groove 3, the sealing ring 4 is installed with an interference fit with the card groove 3, and a buffer section 5, a vibration reduction section 6 and a connecting section 7 are arranged between the crimping deformation section 1 and the external thread joint 2.

[0023] The buffer section 5 is arranged between the crimping deformation section 1 and the vibration reduction section 6, and the connecting section 7 is arranged between the vibration reduction section 6 and the external thread joint 2. The crimping deformation section 1, the slot 3, the buffer section 5, the vibration reduction section 6, the connecting section 7 and the external thread joint 2 are an integrated structure. During production, the crimping deformation section 1, the slot 3, the buffer section 5, the vibration reduction section 6 and the connecting section 7 are gradually expanded into shape through a whole steel pipe, and are welded to the external thread joint 2 into a whole to ensure sufficient strength.

[0024] The buffer section 5 has the same inner and outer diameters as the crimping deformation section 1. The length of the buffer section 5 is not less than half the length of the crimping deformation section 1 on one side of the slot 3. There is a gradual shape change between the crimping deformation section 1 and the squeezed and un-squeezed parts of the stainless steel tube. The buffer section 5 is used to give the crimping deformation section 1 a sufficient deformation distance to ensure stable crimping, and to increase the distance between the crimping deformation section 1 and the vibration reduction section 6 to prevent the cross-sectional shape of the vibration reduction section 6 from changing. The inner and outer diameters of the connecting section 7 are not greater than the inner and outer diameters of the buffer section 5.

[0025] The inner diameter of the sealing ring 4 is smaller than the inner diameter of the crimping deformation section 1. The outer wall of the sealing ring 4 is equidistantly provided with circumferential anti-skid grooves 41 surrounding the circumference. The circumferential inner wall of the sealing ring 4 is equidistantly provided with deformation grooves 42 parallel to the axis. When the stainless steel pipe to be connected is inserted into the pipe fitting, it contacts and rubs with the sealing ring 4. The circumferential anti-skid groove 41 can increase the friction between the sealing ring 4 and the inner wall of the slot 3 to prevent the sealing ring 4 from twisting and deforming and affecting the sealing effect. The deformation groove 42 can reduce the contact area of ​​the stainless steel pipe insertion, thereby reducing the friction and facilitating smooth insertion, and at the same time can facilitate the synchronous radial contraction of the entire circle of the sealing ring 4, with consistent deformation, thereby improving the sealing effect.

[0026] The vibration-damping section 6 is in the shape of a bellows, and the bellows-shaped vibration-damping section 6 includes at least one crest and trough structure. The bellows-shaped vibration-damping section 6 can allow the pipe to expand and contract a small amount, as well as to bend a small amount, thereby transferring the vibration deformation site from the crimping deformation section 1 to the vibration-damping section 6 which is more easily deformed, thereby protecting the pipe connection and improving the overall structural stability and sealing.

Claims

1. A compression type direct stainless steel pipe fitting, characterized in that: The invention comprises a crimping deformation section (1) and an external thread connector (2); the inner wall of the crimping deformation section (1) is provided with a groove (3) protruding outward along the circumferential direction; a sealing ring (4) is movably installed inside the groove (3); a buffer section (5), a vibration reduction section (6) and a connecting section (7) are provided between the crimping deformation section (1) and the external thread connector (2); the buffer section (5) is provided between the crimping deformation section (1) and the vibration reduction section (6); the connecting section (7) is provided between the vibration reduction section (6) and the external thread connector (2); and the vibration reduction section (6) is in the shape of a corrugated tube.

2. A compression type direct stainless steel pipe fitting according to claim 1, characterized in that: The crimping deformation section (1), the clamping groove (3), the buffer section (5), the vibration reduction section (6), the connecting section (7) and the external thread connector (2) are an integrated structure.

3. A compression type direct stainless steel pipe fitting according to claim 1, characterized in that: The buffer section (5) has the same inner and outer diameters as the crimping deformation section (1); the length of the buffer section (5) is not less than half the length of the crimping deformation section (1) on one side of the slot (3); and the inner and outer diameters of the connecting section (7) are not greater than the inner and outer diameters of the buffer section (5).

4. A compression type direct stainless steel pipe fitting according to claim 3, characterized in that: The inner diameter of the sealing ring (4) is smaller than the inner diameter of the crimping deformation section (1).

5. A compression type direct stainless steel pipe fitting according to claim 4, characterized in that: The outer wall of the sealing ring (4) is provided with circumferential anti-skid grooves (41) around the circumference at equal intervals, and the inner wall of the circumference of the sealing ring (4) is provided with deformation grooves (42) parallel to the axis at equal intervals.

6. A compression type direct stainless steel pipe fitting according to claim 1, characterized in that: The corrugated tube-shaped vibration-damping section (6) comprises at least a wave crest and a wave trough structure.

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