Necking and flaring device
By designing the expansion and shrinking port device, combining the flaring parts and shrinking pipes, the flaring and shrinking operation of the copper pipe port is realized, solving the problem of single functions of the existing device, improving processing efficiency and reducing costs.
Patent Information
- Application Number
- CN202422389152.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-29
- Publication Date
- 2025-08-15
- Estimated Expiration
- 2034-09-29
AI Technical Summary
The existing processing devices can only flar or shrink the copper pipe port, and have a single function and cannot meet the needs of flaring and shrinking the port at the same time.
A expansion port device is designed, including a flaring member and a shrinking tube. The flaring member is coaxially arranged on the hollow structure of the shrinking tube to form an expansion orifice. The flaring guide section and the shrinking guide section are arranged in the axial direction. The flaring guide section is located at the second end of the flaring member, and the shrinking guide section is located at the first end of the shrinking tube. Both are penetrated to realize the functions of flaring and shrinking.
The flaring and shrinking operation of copper pipe ports is realized, reducing processing processes, saving labor costs, shortening processing cycles, and avoiding waste of materials.
Smart Images
Figure CN223222330U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of copper tube expansion and contraction, and particularly relates to an expansion and contraction device. Background Art
[0002] During the production and processing of heat exchanger copper tubes, the tube ends need to be expanded or narrowed to facilitate the connection of the copper tubes to adjacent pipelines or other components and equipment. Existing processing equipment can only expand or narrow the tube ends, which is a single function. Utility Model Content
[0003] In view of the above problems, the utility model provides an expansion and contraction device, which can simultaneously expand and contract the pipe orifice, thereby solving the problem of single function.
[0004] In order to achieve the above purpose, the present invention adopts the following technical solutions:
[0005] A device for expanding and contracting includes an expanding piece and a contracting tube, wherein the contracting tube is a hollow structure, and the expanding piece is coaxially sleeved on the hollow structure of the contracting tube. The outer wall of the expanding piece and the inner wall of the contracting tube are circumferentially spaced apart to form an expanding and contracting cavity, and the expanding and contracting cavity has a contracting guide section extending along the axial direction of the contracting tube, and the contracting guide section is located at the first end of the contracting tube, and the diameter of the contracting guide section uniformly decreases in the direction away from the first end. The expanding piece has an expanding guide section along its axial direction, and the expanding guide section is located at the second end of the expanding piece, and the cross-sectional area of the expanding guide section gradually increases in the direction away from the second end.
[0006] In this way, the hollow structure of the shrinking tube and the expansion piece passing through it are assembled into a whole, forming a new expansion and contraction head with an expansion guide section and a shrinking guide section, which can both expand and shrink the pipe mouth. The shrinking section is located above the shrinking guide section, and the two are connected.
[0007] Furthermore, the expansion guide section is at least partially located outside the shrinking tube.
[0008] With such arrangement, the expansion guide section is at least partially located outside the shrinking pipe. The expansion guide section is first inserted into the pipe to be expanded and shrunken for axial positioning, and then enters the shrinking guide section, which facilitates the assembly of the pipe mouth.
[0009] Furthermore, the axial length of the expansion guide section outside the shrinking tube is l, and the axial length of the expansion guide section is L, which satisfies .
[0010] With this arrangement, if the expansion guide section is too short, it will be difficult to observe the expansion of the pipe mouth while assembling. If it is too long, it will waste materials. The expansion guide section adopts the above length to ensure convenient assembly without causing material waste.
[0011] Furthermore, the expansion and contraction device also includes a expansion section, which is connected to the end of the contraction guide section away from the first end. The expansion section is a tangentially cut cylinder, and the outer wall of the expansion section includes a plurality of tangentially cut surfaces arranged at equal intervals and extending along the expansion section to an end close to the expansion guide section.
[0012] With such an arrangement, tangential cutting of the cylindrical flared section can reduce the contact area between the copper tube and the flared section during expansion and contraction, thereby reducing the friction between the copper tube and the flared section.
[0013] Furthermore, the expansion guide section is conical, and the angle a between the circumferential side wall of the expansion guide section and its central axis is in the range of 10-15°.
[0014] This arrangement can ensure the guiding effect while making the pipe mouth better shaped.
[0015] Furthermore, the hollow structure of the necked tube close to the first end is a truncated cone inner cavity, and the inner side surface of the truncated cone inner cavity is a concave arc surface.
[0016] With such arrangement, the inner side surface of the inlet end of the shrinking guide end is an inner concave arc surface horizontally tangent to the lower end surface of the shrinking tube, which is conducive to the smooth entry of the copper tube to be shrunken into the interior of the shrinking guide end, has a strong guiding effect, and is conducive to the forming of the tube mouth.
[0017] Furthermore, the angle range b between the inclined side wall of the frustum inner cavity and its central axis is 10-15°.
[0018] Such an arrangement can ensure its guiding function while making the pipe mouth better shaped.
[0019] Furthermore, the expansion piece is provided with a positioning section, the positioning section is located in the middle of the expansion piece, the inner wall of the shrinking tube has a matching section, and the positioning section is arranged in a one-to-one correspondence with the positioning cavity.
[0020] In this way, the positioning cavity is arranged to cooperate with the positioning section, thereby ensuring the concentricity of the two. The interference fit between the positioning section and the positioning cavity ensures the structural stability of the assembly of the two.
[0021] Furthermore, the expansion and contraction device further comprises a flat knife and a mounting seat, the mounting seat being sleeved on the outer side of the contraction tube away from the first end, and the contraction tube being detachably connected, a flat knife mounting groove extending along its axial direction is provided on one side wall of the contraction tube and the mounting seat, and the flat knife is obliquely assembled in the flat knife mounting groove
[0022] With this arrangement, the flat knife is placed in the flat knife mounting groove to clamp the flat knife and prevent the flat knife from shaking during cutting; at the same time, the flat knife mounting groove can be used as an oil storage tank to ensure lubrication inside the expansion and contraction pipe; the flat knife is arranged in an inclined manner in the flat knife mounting groove, which is conducive to the circulation of lubricating oil.
[0023] Furthermore, the flat knife mounting groove on the necking tube includes a vertical notch and a transverse notch extending along its axial direction, the transverse notch and the vertical notch are interconnected, and the transverse notch is arranged close to the first end, and the circumferential dimension of the transverse notch along the necking tube is larger than the circumferential dimension of the vertical notch.
[0024] In this way, the vertical notch can reduce the contact area between the copper tube and the inner wall of the shrinking tube, thereby reducing the friction between the copper tube and the shrinking tube; on the other hand, the vertical notch is provided with a flat knife.
[0025] This new pipe expansion and contraction device combines an expansion piece and a contraction tube, which are coaxially assembled. Through structural optimization, the inner and outer diameters of the copper pipe's opening are guaranteed to meet the drawing requirements after processing. This reduces the previously required multiple steps to a single process, saving labor costs and shortening the product processing cycle. Furthermore, the expansion piece has an expansion guide along its axial direction, and the expansion piece and contraction tube form contraction guides, allowing the pipe opening to be expanded and contracted while ensuring the inner and outer diameters are aligned. BRIEF DESCRIPTION OF THE DRAWINGS
[0026] Figure 1 This is a structural schematic diagram of the expansion and contraction device described in the utility model.
[0027] Figure 2 It is a longitudinal sectional view of the expansion and contraction device of the utility model;
[0028] Figure 3 This is a schematic structural diagram of the expansion piece described in the utility model;
[0029] Figure 4 This is a front view of the expansion piece described in the utility model;
[0030] Figure 5 A bottom view of the expansion member of the present invention;
[0031] Figure 6 This is a schematic structural diagram of the necked tube described in the present invention;
[0032] Figure 7 It is a schematic diagram of the expansion and contraction pipe in use according to the present invention.
[0033] Among them, 1- expansion piece, 2- shrinking tube, 3- plane knife, 4- mounting seat, 5- shrinking guide section, 6- shrinking section, 11- expansion guide section, 12- expansion section, 13- positioning section, 14- cylindrical section, 15- frustum section, 121- chord section, 21- frustum cavity, 22- positioning cavity, 23- annular platform, 24- second inner diameter section, 25- third inner diameter section, 26- plane knife mounting groove, 261- vertical notch, 262- horizontal notch. DETAILED DESCRIPTION
[0034] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.
[0035] like Figure 1-Figure 7 As shown, a new type of pipe expansion and contraction device includes an expansion piece 1 and a contraction tube 2, the contraction tube 2 is a hollow structure, the expansion piece 1 is coaxially sleeved on the hollow structure of the contraction tube 2, the outer wall of the expansion piece 1 and the inner wall of the contraction tube 2 are circumferentially spaced apart to form an expansion and contraction cavity, the expansion and contraction cavity has a contraction guide section 5 extending along the axial direction of the contraction tube 2, the contraction guide section 5 is located at the first end of the contraction tube 2, and the diameter of the contraction guide section 5 decreases uniformly in the direction away from the first end, the expansion piece 1 has an expansion guide section 11 along its axial direction, the expansion guide section 11 is located at the second end of the expansion piece 1, and the cross-sectional area of the expansion guide section 11 gradually increases in the direction away from the second end.
[0036] In this embodiment, the hollow structure of the shrinking tube 2 and the expansion piece 1 passing through it are assembled into a whole to form a new expansion and contraction head having a flaring section 12, a shrinking section 6, a flaring guide section 11 and a shrinking guide section 5. The shrinking section 6 ensures the inner diameter and outer diameter of the copper tube, so that the tube mouth can be expanded or shrunken while ensuring the inner and outer diameters.
[0037] Furthermore, the expansion guide section 11 is at least partially located outside the shrinking tube 2 .
[0038] With this arrangement, the flaring guide section 11 is at least partially located outside the shrinking tube 2, which facilitates the insertion of the copper tube and facilitates assembly processing. The gradually changing diameter of the flaring guide section 11 not only facilitates the smooth insertion of the expanded tube into the outside of the flaring member 1, but also gradually expands the inner diameter of the expanded tube to the standard inner diameter. The gradually changing diameter of the shrinking guide section 5 gradually reduces the outer diameter of the shrinking tube to the standard outer diameter. The location of the flaring guide section 11 outside the shrinking tube 2 effectively shortens the length of the shrinking tube, avoids material waste, reduces production costs, and better ensures the flaring and shrinking effects.
[0039] Furthermore, the flaring guide section 11 is located outside the shrinking tube 2 and has an axial length of l, and the axial length of the flaring guide section 11 is L, which satisfies .
[0040] It is understandable that if the expansion guide section is too short, it will be difficult to observe the expansion of the tube mouth while assembling. Specifically, in the present embodiment, the expansion guide section 11 is entirely located outside the shrinking tube 2, the lower end of the expansion section 12 and the lower end face of the shrinking tube 2 are located in the same horizontal plane, and the shrinking guide section 5 extends upward from the lowest end of the shrinking tube 2. It is understandable that this structural setting ensures the continuity of the expansion and shrinking operations, as well as the outer diameter during expansion and the inner diameter during shrinking. At the same time, it can shorten the length of the shrinking tube 2, avoid material waste, and reduce production costs. Of course, in other embodiments, the expansion guide section 11 can also extend entirely or partially out of the lower port of the shrinking tube 2, and the shrinking guide section 5 can be moved upward as needed. Can 、 、 or 1.
[0041] In this embodiment, the flaring guide section 11 has a U-shaped longitudinal cross-section that gradually expands from bottom to top, with its outer side being an arcuate surface. It will be appreciated that this shape of the flaring guide section 11 facilitates entry into the internal constriction of the copper tube to be flared, thereby gradually widening the constriction. Of course, other structural forms of the flaring guide section 11 may be employed in other embodiments, such as an inverted cone, an inverted truncated cone, or an inverted truncated pyramid.
[0042] In an embodiment of the present application, the expansion member 1 also includes a frustum section 15 and a cylindrical section 14, and the frustum section 15 and the cylindrical section 14 are arranged in sequence from top to bottom on the upper part of the positioning section 13, and the expansion section 12 is connected end to end with the positioning section 13, the bottom diameter of the frustum section 15 is the same as the diameter of the cylindrical section 14, the diameter of the cylindrical section 14 is smaller than the diameter of the positioning section 13, the diameter of the expansion section 12 is smaller than the bottom diameter of the positioning section 13, and the top diameter of the expansion guide section 11 is the same as the diameter of the expansion section 12.
[0043] Furthermore, the expansion and contraction device further includes an expansion section 12, which is connected to the end of the contraction guide section 5 away from the first end. The expansion section 12 is a tangentially cut cylinder, and the outer wall of the expansion section 12 includes a plurality of equally spaced tangentially cut surfaces 121 extending along the expansion section 12 to an end near the expansion guide section 11. In this embodiment, the bottoms of the tangentially cut surfaces 121 are trough-shaped with the openings facing upward.
[0044] It is understood that tangentially cutting the cylindrical flared section 12 can reduce the contact area between the copper tube and the flared section 12 during expansion and contraction, thereby reducing friction between the copper tube and the flared section 12. In this embodiment, the number of tangentially cut surfaces 121 is three. In other embodiments, the flared section 12 can be cylindrical, or have another number of tangentially cut cylinders.
[0045] In the embodiment of the present application, the hollow structure of the shrinking tube 2 near the first end is a truncated cone inner cavity 21, and the inner side surface of the truncated cone inner cavity 21 is a concave arc surface. It is understood that the inner side surface of the inlet end of the shrinking guide end is a concave arc surface horizontally tangent to the lower end surface of the shrinking tube 2, which facilitates the smooth entry of the copper tube to be shrunken into the shrinking guide section.
[0046] The angle between the circumferential side wall of the flaring guide section 11 and its central axis is a, and the range of a is 10-15 degrees. The angle between the side wall of the inner cavity of the cone constituting the shrinking guide section 5 and its central axis is b, and the range of b is 10-15 degrees. If the angle is too small, the guiding effect of the flaring guide section 11 and the shrinking guide section 5 will be weak. If the angle is too large, the deformation of the inner diameter and diameter of the copper tube will be too large, which is not conducive to the tube mouth forming. In this embodiment, the circumferential side wall of the flaring guide section 11 is The angle a with its central axis is in the range of 10-15°, and the angle b with the side wall of the inner cavity of the frustum constituting the necking guide section 5 and its central axis is in the range of 10-15°, which can ensure their respective guiding functions while making the pipe mouth better formed. Specifically, the angle a between the circumferential side wall of the expanding guide section 11 and its central axis is 10°, 12° or 15°, and the angle b between the side wall of the inner cavity of the frustum constituting the necking guide section 5 and its central axis is 10°, 12° or 15°.
[0047] In the embodiment of the present application, the flaring member 1 is provided with a positioning section 13, which is located in the middle of the flaring member 1. The inner wall of the shrinking tube has a positioning cavity 22, and the positioning section 13 is provided in a one-to-one correspondence with the positioning cavity 22. It can be understood that the interference fit between the positioning section 13 and the positioning cavity 22 ensures concentricity between the two and increases assembly strength.
[0048] Specifically, the positioning cavity 22 is located at the uppermost part of the inner cavity of the shrinking tube 2, and the upper end surface of the positioning section 13 and the upper end surface of the shrinking tube 2 are located in the same horizontal plane, which is convenient for the assembly and positioning of the expansion piece 2 and the shrinking tube 2, and the two are fixedly connected by electric welding in the horizontal plane. It can be understood that the upper end surface of the positioning section 13 and the upper end surface of the shrinking tube 2 are located in the same horizontal plane, which is more convenient for the spot welding connection between the two, and the connection between the two is more secure. Of course, in other embodiments, the upper end surface of the positioning section 13 can be located above the upper end surface of the shrinking tube 2 or in the positioning cavity 22, and the connection method between the two is not limited to spot welding.
[0049] In an embodiment of the present application, corresponding to the shape of the expansion piece 1, an annular platform 23 is provided on the side wall of the inner cavity of the shrinking tube 2, above the annular platform 23 is a positioning cavity 22, the cavity at the annular platform 23 is a second inner diameter section 24, and a third inner diameter section 25 is provided below the annular platform 23. The variable diameter cavity section is located below the third inner diameter section 25, and the expansion section 12 passes through the second inner diameter section 24, the third inner diameter section 25 and the variable diameter cavity section. The diameter of the third inner diameter section 25 is larger than the diameter of the second inner diameter section 24; the frustum section 15 and the cylindrical section 14 are located outside the shrinking tube 2, and the upper end of the expansion piece 1 is connected to the bench drill.
[0050] In an embodiment of the present application, the expansion and contraction device also includes a flat knife 3 and a mounting seat 4, the mounting seat 4 is sleeved on the outer side of the contraction tube 2 away from the first end, and the contraction tube 2 is detachably connected, and a flat knife mounting groove 26 extending along its axial direction is provided on one side wall of the contraction tube 2 and the mounting seat 4, and the flat knife 3 is obliquely assembled in the flat knife mounting groove 26.
[0051] It can be understood that the flat knife 3 is placed in the flat knife mounting groove 26 to clamp the flat knife 3 and prevent the flat knife 3 from shaking during cutting; the flat knife 3 is used to ensure the length of the expansion or contraction, and the flat knife mounting groove 26 can act as an oil storage tank to ensure lubrication inside the expansion and contraction tube 2.
[0052] The plane knife 3 is arranged vertically or obliquely in the plane knife installation groove 26. In order to facilitate the circulation of lubricating oil, in the embodiment of the present application, the plane knife 3 is arranged obliquely outward from the lower end in the plane knife installation groove 26.
[0053] In this embodiment, the flat knife mounting groove 26 on the necking tube 2 includes a vertical notch 261 and a transverse notch 262 extending along its axial direction. The transverse notch 262 and the vertical notch 261 are interconnected, and the transverse notch 262 is arranged close to the first end. The circumferential dimension of the transverse notch 262 along the necking tube 2 is larger than the circumferential dimension of the vertical notch.
[0054] It can be understood that the setting of the transverse notch can reduce the contact area between the copper tube and the inner wall of the shrinking tube 2, thereby reducing the friction between the copper tube and the shrinking tube 2; on the other hand, the setting of the transverse notch facilitates the installation of the flat knife 3 on the mounting seat 4, and at the same time facilitates the observation of the expansion and contraction of the copper tube and the control of the expansion and contraction length of the copper tube.
[0055] Those skilled in the art should understand that the above description is only a specific embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.
Claims
1. A device for expanding and contracting a port, characterized in that: The invention comprises an expanding piece (1) and a shrinking tube (2), wherein the shrinking tube (2) is a hollow structure, the expanding piece (1) is coaxially sleeved on the hollow structure of the shrinking tube (2), the outer wall of the expanding piece (1) and the inner wall of the shrinking tube (2) are spaced apart in the circumferential direction to form an expanding and shrinking cavity, the expanding and shrinking cavity having a shrinking guide section (5) extending along the axial direction of the shrinking tube (2), the shrinking guide section (5) being located at the first end of the shrinking tube (2), the diameter of the shrinking guide section (5) being uniformly reduced in a direction away from the first end, the expanding piece (1) having an expanding guide section (11) along its axial direction, the expanding guide section (11) being located at the second end of the expanding piece (1), the cross-sectional area of the expanding guide section (11) being gradually increased in a direction away from the second end.
2. The expansion and contraction device according to claim 1, characterized in that: The expansion guide section (11) is at least partially arranged outside the shrinking tube (2).
3. The expansion and contraction device according to claim 2, characterized in that: The flaring guide section (11) is located outside the shrinking tube (2) and has an axial length of l. The axial length of the flaring guide section (11) is L, satisfying .
4. The expansion and contraction device according to claim 1, characterized in that: The expansion and contraction device further comprises an expansion section (12), the expansion section (12) being connected to an end of the contraction guide section (5) away from the first end, the expansion section (12) being a tangentially cut cylinder, and the outer side wall of the expansion section (12) comprising a plurality of tangentially cut surfaces (121) arranged at equal intervals and extending along the expansion section (12) to an end close to the expansion guide section (11).
5. The expansion and contraction device according to claim 1, characterized in that: The expansion guide section (11) is conical, and the included angle a between the circumferential side wall of the expansion guide section (11) and its central axis is in the range of 10-15°.
6. The expansion and contraction device according to claim 1, characterized in that: The hollow structure of the necked tube (2) close to the first end is a truncated cone inner cavity, and the inner side surface of the truncated cone inner cavity is a concave arc surface.
7. The expansion and contraction device according to claim 6, characterized in that: The angle range b between the inclined side wall of the frustum inner cavity and its central axis is 10-15°.
8. The expansion and contraction device according to claim 1, characterized in that: The expanding member (1) is provided with a positioning section (13), the positioning section (13) is located in the middle of the expanding member (1), the inner wall of the shrinking tube has a positioning cavity (22), and the positioning section (13) and the positioning cavity (22) are arranged in a one-to-one correspondence.
9. The expansion and contraction device according to any one of claims 1 to 8, characterized in that: The expansion and contraction device further comprises a flat knife (3) and a mounting seat (4); the mounting seat (4) is sleeved on the outer side of the contraction tube (2) away from the first end and is detachably connected to the contraction tube (2); a flat knife mounting groove (26) extending along the axial direction thereof is provided on one side wall of the contraction tube (2) and the mounting seat (4); the flat knife (3) is obliquely assembled in the flat knife mounting groove (26).
10. The expansion and contraction device according to claim 9, characterized in that: The flat knife mounting groove (26) on the shrinking tube (2) comprises a vertical notch (261) and a transverse notch (262) extending along its axial direction, the transverse notch (262) and the vertical notch (261) being interconnected, and the transverse notch (262) being arranged close to the first end, and the circumferential dimension of the transverse notch (262) along the shrinking tube (2) being larger than the circumferential dimension of the vertical notch.