Press-connection fitting assembly, press-connection composite fitting assembly and manufacturing method

Abstract

The present invention discloses a press-fit connection pipe fitting, a press-fit composite pipe fitting and a manufacturing method, including: a pipe fitting body; an annular sealing groove provided on the inner wall of the pipe fitting body for installing a sealing ring; and a press-fit rib formed by protruding from the material of the pipe fitting body, the press-fit rib forms a press-fit groove on the inner wall of the pipe fitting body, and the press-fit groove provides a material fitting space for the press-fit connection between the press-fit connection pipe fitting and the metal pipe. The present invention reduces the requirement for the wall thickness of the pipe fitting body, reduces the production cost of the press-fit connection pipe fitting. The pressing pressure of the pipe fitting body is also correspondingly reduced. In addition, the pipe fitting body and the metal pipe after production can also meet the actual use requirements. The pipe fitting body and the metal pipe can be connected on-site only by relying on simple tools without the need to process the metal pipe in advance, so the assembly process is simple and the assembly cost is lower.

Description

Technical Field

[0001] The present invention relates to a crimping connection pipe fitting assembly, a crimping composite pipe fitting assembly and a manufacturing method, belonging to the field of pipe material production.

Background Art

[0002] Two metal pipes are connected through a crimping connection pipe fitting assembly. The end parts of the two metal pipes are respectively inserted into the middle of the crimping connection pipe fitting, and then the crimping connection pipe fitting is extruded to realize the fixation between the pipe and the crimping connection pipe fitting. In order to achieve the fixation between the pipe and the crimping connection pipe fitting, it is necessary to make the crimping connection pipe fitting have a relatively thick thickness, so that after the crimping connection pipe fitting is deformed, a sufficient clamping force can be formed with the pipe, which invisibly increases the production cost of the crimping connection pipe fitting.

Summary of the Invention

[0003] The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art and provide a crimping connection pipe fitting assembly, a crimping composite pipe fitting assembly and a manufacturing method with lower production costs.

[0004] To solve the above technical problems, the present invention adopts the following technical solutions:

[0005] A crimping connection pipe fitting assembly includes: a pipe fitting body for crimping connection with a metal pipe; and an annular sealing groove provided on the inner wall of the pipe fitting body for installing a sealing ring; and a crimping rib formed by protruding from the material of the pipe fitting body, and the crimping rib forms a crimping groove on the inner wall of the pipe fitting body, and the crimping groove provides a material fitting space for the crimping connection between the crimping connection pipe fitting assembly and the metal pipe.

[0006] The beneficial effects of the present invention are:

[0007] The sealing ring is installed into the annular sealing groove. At the same time, relying on the restriction of the metal pipe, the sealing ring fills and seals the annular sealing groove. First, a conventional round pipe of the existing standard is used as the metal pipe. The end of the metal pipe is installed inside the fitting body, so that the outer wall of the metal pipe is radially aligned with the crimping groove. Press the crimping rib from the outside to the inside, and the outer wall of the metal pipe automatically deforms into a clamping block in the crimping groove. The cooperation of the crimping groove and the clamping block increases the clamping force between the fitting body and the metal pipe, enhances the anti-pulling performance of the fitting body, thereby reducing the pressing requirement of the fitting body. At the same time, the wall thickness of the fitting body can also be thinned to a certain extent, reducing the requirement for the wall thickness of the fitting body and the production cost of the crimped connection fitting. The pressing pressure of the fitting body is also correspondingly reduced. In addition, the fitting body and the metal pipe after production can also meet the actual use requirements. The fitting body and the metal pipe can be connected on-site only by simple tools without prior processing of the metal pipe, so the assembly process is simple and the assembly cost is lower.

[0008] The number of the crimping ribs in the present invention is at least two, and the crimping ribs are distributed on both sides of the annular sealing groove in the axial direction of the fitting body.

[0009] The wall thickness of the fitting body in the present invention is 0.6 - 1.8 mm.

[0010] A limiting step for limiting the end of the metal pipe is arranged on the inner wall of the fitting body in the present invention.

[0011] A spacing is left between the crimping rib and the end of the fitting body in the present invention.

[0012] A crimped composite fitting assembly includes a sealing ring, a crimped connection fitting assembly, and a metal pipe sleeved in the middle of the crimped connection fitting assembly. The outer wall of the metal pipe presses the sealing ring in the annular sealing groove, the sealing ring seals the annular sealing groove, the outer wall of the metal pipe protrudes to form a clamping block, and the clamping block is stuck in the crimping groove.

[0013] A manufacturing method of a crimped composite fitting assembly is characterized by comprising the following steps:

[0014] Step ①: Extrude the inner wall of the fitting body to form a crimping rib by the protrusion of the fitting body material. At the same time, a crimping groove is formed on the inner wall of the fitting body by the crimping rib. The sealing ring is clamped into the annular sealing groove, and then the round tubular metal pipe is inserted into the middle of the fitting body until the outer wall of the fitting body moves to the annular sealing groove and the crimping groove.

[0015] Step ②: Extrude the outer wall of the fitting body at the annular sealing groove and the crimping rib simultaneously from the outside of the fitting body, so that the sealing ring deforms to seal the annular sealing groove, and at the same time, the outer wall of the metal pipe at the crimping groove deforms to form a clamping block and is thus stuck in the crimping groove.

[0016] In step ① of the present invention, the shape of the crimping rib is annular, and after step ② is completed, the outer contour of the crimping rib is polygonal.

[0017] In step ① of the present invention, the height of the crimping rib protruding from the outer wall of the pipe fitting body is not less than 0.2 mm.

[0018] In step ② of the present invention, the pressure received by the crimping rib is 10 - 30 MPa.

[0019] Other features and advantages of the present invention will be disclosed in detail in the following specific embodiments and drawings.

Description of the Drawings

[0020] The present invention will be further described below with reference to the drawings:

[0021] Figure 1 It is a schematic cross-sectional structure diagram of a crimping type connecting pipe fitting (straight pipe) in an embodiment of the present invention;

[0022] Figure 2 It is a schematic cross-sectional structure diagram of a crimping type connecting pipe fitting (bent pipe) in an embodiment of the present invention;

[0023] Figure 3 It is a schematic cross-sectional structure diagram of a crimping type connecting pipe fitting (special-shaped pipe) in an embodiment of the present invention;

[0024] Figure 4 It is a schematic cross-sectional structure diagram of a crimping type composite pipe fitting before crimping in an embodiment of the present invention;

[0025] Figure 5 It is a schematic three-dimensional structure diagram of a crimping type composite pipe fitting before crimping in an embodiment of the present invention;

[0026] Figure 6 It is a schematic cross-sectional structure diagram of a crimping type composite pipe fitting after crimping in an embodiment of the present invention;

[0027] Figure 7 It is Figure 6 The enlarged structure diagram at position A in;

[0028] Figure 8 It is a schematic three-dimensional structure diagram of a crimping type composite pipe fitting after crimping in an embodiment of the present invention;

[0029] Figure 9 It is a schematic three-dimensional structure diagram of a mold for crimping a crimping type composite pipe fitting assembly with a crimping tool in an embodiment of the present invention;.

Specific Embodiments

[0030] The technical solutions of the embodiments of the present invention will be explained and described below in conjunction with the accompanying drawings of the embodiments of the present invention. However, the following embodiments are only the preferred embodiments of the present invention, not all of them. Based on the embodiments in the implementation manners, other embodiments obtained by those skilled in the art without creative efforts all fall within the protection scope of the present invention.

[0031] In the following description, terms such as "inner", "outer", "upper", "lower", "left", "right", etc., indicating directions or positional relationships are only for the convenience of describing the embodiments and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present invention.

[0032] Embodiment:

[0033] See Figures 1-9 , what this embodiment provides is a crimping type composite pipe fitting assembly, including a sealing ring 1, a crimping type connecting pipe fitting assembly, and a metal pipe 3 in the middle of the crimping type connecting pipe fitting assembly.

[0034] The crimping type connecting pipe fitting assembly includes a pipe fitting body 2, an annular sealing groove 5 provided on the inner wall of the pipe fitting body 2, and a crimping rib 7 formed by the outward protrusion of the material of the pipe fitting body 2. The crimping rib 7 forms a crimping groove 8 on the inner wall of the pipe fitting body 2. In addition, the outer wall of the pipe fitting body 2 protrudes outward at the annular sealing groove 5, so that the pipe fitting body 2 partially forms a sealing rib 6 at the annular sealing groove 5. The crimping groove 8 provides a material fitting space for the crimping connection between the crimping type connecting pipe fitting assembly and the metal pipe 3.

[0035] The pipe fitting body 2 can be a straight pipe, a bent pipe, a tee pipe, or a pipe fitting of any other shape. The metal pipe 3 extends into the pipe fitting body 2 from one end of the pipe fitting body 2, and then the outer wall of the pipe fitting body 2 is extruded to realize the fixation between the pipe fitting body 2 and the metal pipe 3.

[0036] Taking the straight pipe-shaped pipe fitting body 2 as an example, a limiting step 4 is provided at the midpoint position of the inner wall of the pipe fitting body 2. One metal pipe 3 is inserted into each of the left end and the right end of the pipe fitting body 2, and the end of the metal pipe 3 impacts against the limiting step 4 to limit the position of the end of the metal pipe 3 inside the pipe fitting body 2.

[0037] The left half and the right half of the pipe fitting body 2 are symmetric about the limiting step 4. This embodiment will be described with respect to the right half of the pipe fitting body 2.

[0038] Among them, a total of two crimping ribs 7 are provided on the right half of the pipe fitting body 2. Axially on the pipe fitting body 2, the two crimping ribs 7 are respectively located on both sides of the annular sealing groove 5. The more the number of crimping ribs 7, the higher the connection strength between the pipe fitting body 2 and the metal pipe 3. In other embodiments, the number of crimping ribs 7 can also be only one.

[0039] In this embodiment, the difference between the pipe fitting body 2 and the pipe fitting body 2 in the prior art lies in the clamping ribs 7. By stamping the inner wall of the pipe fitting body 2 in the prior art, the clamping ribs 7 and the clamping grooves 8 can be formed on the side wall of the pipe fitting body 2 simultaneously, so that the wall thickness of the clamping ribs 7 is the same as or close to the wall thickness of other parts of the pipe fitting body 2. The stamping process is to transmit pressure to the inner wall of the pipe fitting body 2 through oil, water or other media. The inner wall of the pipe fitting body 2 is uniformly stressed in its own circumferential direction, so the shape of the formed clamping ribs 7 is annular. Of course, in other embodiments, if other methods are used to manufacture the clamping ribs 7, the clamping ribs 7 can also be set into other shapes.

[0040] A gap is left between the clamping rib 7 on the right side and the right end of the pipe fitting body 2 to enhance the strength of the pipe fitting body 2.

[0041] In addition, the metal pipe 3 in this embodiment is a standard round pipe and does not require additional processing, reducing the production cost of the pipe connection structure.

[0042] After the clamping ribs 7 and the clamping grooves 8 on the right half of the pipe fitting body 2 are made, first, the sealing ring 1 is snapped into the annular sealing groove 5 on the right half of the pipe fitting body 2, and then the left end of the metal pipe 3 moves from the right end of the pipe fitting body 2 into the pipe fitting body 2. The left end of the metal pipe 3 passes through the clamping groove 8, the annular sealing groove 5 and the clamping groove 8 in sequence and finally presses against the limiting step 4. After the left end of the metal pipe 3 is pressed against the limiting step 4, the outer wall of the metal pipe 3 closes the annular sealing groove 5 and the clamping groove 8 at the same time, and the sealing ring 1 is clamped in the annular sealing groove 5 by the outer wall of the metal pipe 3.

[0043] The fixation between the pipe fitting body 2 and the metal pipe 3 needs to be realized by clamping the pipe fitting body 2. For this purpose, a clamping tool is required. The positions of the clamping ports of the clamping tool are, in sequence along a straight line, the rib clamping port 10, the sealing ring clamping port 9 and the rib clamping port 10. The edge contour shape of the rib clamping port 10 is hexagonal, and the edge contour shape of the sealing ring clamping port 9 is circular.

[0044] After the metal pipe 3 is inserted into the right half of the pipe fitting body 2, the two annular clamping ribs 7 on the right half of the pipe fitting body 2 are respectively aligned with the two rib clamping ports 10, and the sealing ring clamping port 9 is aligned with the sealing rib 6. Then the clamping tool closes the mold so that the rib clamping port 10 squeezes the clamping rib 7, and at the same time the sealing ring clamping port 9 squeezes the sealing rib 6. Finally, the shape of the clamping rib 7 matches the rib clamping port 10, and the shape of the sealing rib 6 matches the sealing ring clamping port 9. The simultaneous clamping method of the rib clamping port 10 and the sealing ring clamping port 9 avoids the unnecessary influence of the later compressed part on the structure after the earlier compressed part is clamped in the case where the clamping rib 7 and the sealing rib 6 are successively compressed.

[0045] The sealing convex rib 6 gradually deforms when squeezed by the sealing ring pressing port 9, and the sealing ring 1 in the annular sealing groove 5 also deforms until the entire annular sealing groove 5 is filled to achieve a sealing effect. The pressing rib 7 gradually deforms the metal pipe 3 during the gradual deformation process, thereby pressing and fixing the pipe body 2 and the metal pipe 3. The pressing groove 8 gradually deforms during the deformation process of the pressing rib 7, and at the same time, the inner wall of the pipe body 2 acts on the outer wall of the metal pipe 3. The outer wall of the metal pipe 3 at the pressing groove 8 gradually bulges to form a smaller block 11, which gradually snaps into the pressing groove 8. The block 11 cooperates with the pressing groove 8 to greatly increase the connection strength between the pipe body 2 and the metal pipe 3, and strengthen the pull-out resistance between the metal pipe 3 and the pipe body 2. The greater the deformation of the pressing rib 7 before and after being pressed by the convex rib pressing opening 10, the larger the volume of the corresponding clamping block 11, and the better the effect of improving the anti-pulling performance between the pipe body 2 and the metal pipe 3 after pressing.

[0046] Since the block 11 and the clamping groove 8 cooperate to improve the pull-out resistance, the wall thickness of the corresponding pipe body 2 before clamping can also be reduced accordingly, and the pressure applied to the pipe body 2 during clamping can also be reduced. Since the block 11 and the clamping groove 8 cooperate to improve the pull-out resistance, the wall thickness of the corresponding pipe body 2 before clamping can also be reduced accordingly, and the pressure applied to the pipe body 2 during clamping can also be reduced. Taking the pipe body 2 with an inner diameter of 16 mm as an example, in the prior art, in the absence of the clamping rib 7 and the clamping groove 8, in order to achieve a sufficient pull-out resistance coefficient between the pipe body 2 and the metal pipe 3, the wall thickness of the pipe body 2 needs to be set at about 1.3 mm, while in this embodiment, the wall thickness of the pipe body 2 before clamping only needs to be 0.8 mm. The forming pressure of the pipe body 2 of the tee-type pipe blank with an inner diameter of 16mm requires about 80Mpa, but in this embodiment, due to the thin-walled pipe body 2, the pressure applied to the pipe body 2 only needs 20Mpa, which greatly reduces the requirements for the clamping equipment. Due to the thin-walled pipe body 2, the unit weight of the same specification pipe body 2 with an inner diameter of 16mm is reduced by about 32%, reducing the production cost of the pipe body 2. Due to the thin-walled pipe body 2, the pipe body 2 with a small elbow with an inner diameter of less than 25mm can be produced using coils, and the yield rate is increased by more than 10%. In addition, part of the annealing process can be omitted, production bumps and scratches can be reduced, and the finished product can be cleaned more easily.

[0047] Table 1 shows the wall thickness data of the pipe body 2 with different inner diameters, the wall thickness data of the pipe body 2 when the clamping block 11 and the clamping groove 8 cooperate, and the wall thickness thinning effect of the pipe body 2 with the same inner diameter in the prior art.

[0048] Table 1

[0049]

[0050]

[0051] In addition, in order to ensure the deformation amount of the clamping rib 7 to ensure the connection strength between the pipe fitting body 2 and the metal pipe 3, in this embodiment, the outer diameter of the end portion of the pipe fitting body 2 before being extruded is 18.9 mm, and the outer diameter of the clamping rib 7 is set at 19.5 mm, so that the difference between the outer diameter of the clamping rib 7 and the outer diameter of the end portion of the pipe fitting body 2 is 0.6 mm. Generally speaking, when the difference between the outer diameter of the clamping rib 7 and the outer diameter of the end portion of the pipe fitting body 2 is not less than 0.2 mm, the actual production requirements can be met.

[0052] As described above, the above is only the specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Those skilled in the art should understand that the present invention includes but is not limited to the content described in the drawings and the above specific embodiments. Any modifications that do not deviate from the functional and structural principles of the present invention will be included in the scope of the claims.

Claims

1. A press - fit type connection pipe fitting assembly, characterized in that: Comprising: A fitting body for crimping connection with a metal pipe; and, An annular sealing groove provided on the inner wall of the fitting body for installing a sealing ring; and, A crimping rib formed by outward protrusion of the fitting body material, the crimping rib forming a crimping groove on the inner wall of the fitting body, the crimping groove providing a material fitting space for the crimping connection of the crimping-type connection fitting assembly and the metal pipe; during the deformation process of the crimping rib, the crimping groove gradually deforms, and at the same time, the inner wall of the fitting body acts on the outer wall of the metal pipe, and the outer wall of the metal pipe at the crimping groove gradually bulges to form a smaller clamping block, and the clamping block gradually snaps into the crimping groove; and, A crimping tool, the outer wall of the fitting body protrudes outward at the annular sealing groove, so that the fitting body partially forms a sealing rib at the annular sealing groove, and the positions of the crimping openings of the crimping tool are successively a rib crimping opening, a sealing ring crimping opening, and a rib crimping opening along a straight line. The rib crimping opening extrudes the crimping rib, and at the same time, the sealing ring crimping opening extrudes the sealing rib, finally making the shape of the crimping rib match the rib crimping opening, and the shape of the sealing rib match the sealing ring crimping opening.

2. The press-fit type connecting pipe fitting assembly according to claim 1, wherein: The number of the crimping ribs is at least two, and the crimping ribs are distributed on both sides of the annular sealing groove in the axial direction of the fitting body.

3. The press-fit type connection pipe fitting assembly according to claim 1, wherein: The wall thickness of the fitting body is 0.6 - 1.8 mm.

4. The press-connection fitting assembly according to claim 1, wherein: A limiting step for limiting the end of the metal pipe is provided on the inner wall of the fitting body.

5. The crimp-type connection pipe fitting assembly according to claim 1, wherein: A spacing is left between the crimping rib and the end of the fitting body.

6. A crimped composite pipe fitting assembly, characterized in that: Comprising a sealing ring, a crimping-type connection fitting assembly according to any one of claims 1 - 5, and a metal pipe sleeved in the middle of the crimping-type connection fitting assembly. The outer wall of the metal pipe presses the sealing ring tightly in the annular sealing groove, the sealing ring seals the annular sealing groove, the outer wall of the metal pipe bulges to form a clamping block, and the clamping block is stuck in the crimping groove.

7. A manufacturing method of the crimped composite pipe fitting assembly according to claim 6, characterized in that: Comprising the following steps: Step ①: Extrude the inner wall of the fitting body, so that the fitting body material protrudes outward to form a crimping rib, and at the same time, the crimping rib forms a crimping groove on the inner wall of the fitting body. Snap the sealing ring into the annular sealing groove, and then insert the tubular metal pipe into the middle of the fitting body until the outer wall of the metal pipe moves to the annular sealing groove and the crimping groove; Step ②: Use a crimping tool to simultaneously extrude the outer wall of the fitting body at the annular sealing groove and the crimping rib from the outside of the fitting body, so that the sealing ring deforms to seal the annular sealing groove, and at the same time, the outer wall of the metal pipe at the crimping groove deforms to form a clamping block and then snaps into the crimping groove.

8. The manufacturing method of the crimped composite pipe fitting assembly according to claim 7, characterized in that: In step ①, the shape of the crimping rib is circular, and after step ② is completed, the outer contour of the crimping rib is polygonal.

9. The manufacturing method of the press-fit composite pipe fitting assembly according to claim 8, characterized in that: In step ①, the height of the crimping rib protruding outward from the outer wall of the fitting body is not less than 0.2 mm.

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