The purpose of this utility model provides the metal circular tube connecting ring, promptly a kind of metallic material product of the integral body that can link together two metal circular tubes.
Foundation of the present utility model is the metal plastic deformation principle.Specify as follows:＜1〉at first, carry out two preparatory works.First preparatory work is to the A of needs connection, an adjustment of carrying out end diameter in B two pipes.Fig. 1 adjusts the longitudinal sectional drawing of A, B two pipe mated condition afterwards with the diameter of A tube end.The adjustment of A tube end diameter is (if the original diameter of A pipe is more a lot of greatly than the diameter of B pipe, then can utilize rotary swager to dwindle) of utilizing that flaring machine enlarges, makes the B tube end to insert, and is too not loosening again.Second preparatory work is that the metal pipe that the selection of material intensity is higher than the A tube material is raw material, by machining, makes the utility model product connecting ring.Fig. 2 is the connecting ring figure of the specifications design of the A that connects as required, B two pipes.Its endoporus is running through whole goods, the big circular cone (A), cylindrical body (B) and roundlet frustum (C) three parts that are had fillet by cylindrical are formed, this diameter is little of forcing the A tube material to produce plastic deformation by changing to greatly, and keeps on a segment length that diameter is constant to help obtaining very high join strength; Its profile has a conical surface (D), so that distinguish the relative position of endoporus each several part from the outside, also has a circular groove (E), is convenient to operator hold steadily connecting ring and unlikely landing.The maximum diameter of connecting ring endoporus is a bit larger tham the external diameter of A pipe, and the minimum diameter of connecting ring endoporus is a bit larger tham the external diameter of B pipe, and this is because only in this way could be assembled together A, B two pipes and connecting ring C rightly.Fig. 3 is the longitudinal sectional drawing that A, B two pipes and connecting ring C are assembled together.In order to make the joint that the sealing that obtains is more reliable, on the surface of contact of A, B two pipes, applied sealing compound D.＜2〉then,, carry out the connection of A, B two pipes according to theory of plastic deformation.As shown in Figure 3, apply external force F
1Clamp the destination county of A pipe enlarged diameter portion, with the fixing relative position of A, B two pipes; Also apply external force F simultaneously
2Promote connecting ring C, the circular cone diameter that utilizes the connecting ring endoporus is by diminishing greatly gradually, force the metallic material of A tube end to produce plastic deformation, be full of the formed space of outer surface of inwall and the B pipe of connecting ring C gradually, just realized the connection of A, B two pipes at this moment.Fig. 4 is the longitudinal sectional drawing after A, B two pipes are realized connecting.C represents connecting ring among Fig. 4, and D represents sealing compound.
The technical solution of the utility model is as follows:＜1〉cross dimension of two metal circular tubes connecting at needs, with an end of a metal circular tube wherein on suitable length, perhaps adopt the flaring machine enlarged, perhaps adopt the rotary swager diameter reduction, be able to another root metal circular tube is inserted this root metal circular tube with suitable gap.Big or small desired two metal tubes that bear hydrodynamic pressure when＜2〉using according to future in the metal tubes connect the power size, determine the shape and size of material category, minimum wall thickness (MINI W.) and the endoporus of connecting ring, and determine the external shape and the size of connecting ring according to the convenient principle of using.＜3〉select the tubing or the bar of the intensity that has corresponding size and be fit to for use according to fixed above-mentioned parameter, and select suitable sealing compound when not high (to sealing requirements can without sealing compound) for use.＜4〉according to the character and the size of selected materials, and the inside and outside shape and size of connecting ring, formulate the mechanical processing technique that adapts, select suitable machining equipment for use, implement connecting ring then to obtain to be suitable for.
Adopt the utility model product to connect metal circular tube, compare with now general welding method, have fairly obvious good effect:＜1〉aspect quality of connection: welding easily reduces join strength because of producing defectives such as pore, slag inclusion, even the escape of liquid phenomenon takes place.The utility model does not need the deposite metal, has avoided fully producing this type of defective, thereby can obtain more reliable quality of connection.＜2〉aspect application area: the metal circular tube of welding of different materials, or diameter differs bigger metal circular tube, all suitable difficulty.No matter the utility model then kind of metallic material is identical or different, connect difficulty or ease and to be connected effect all unaffected; For two identical or different metal circular tubes of diameter, metal circular tube wherein need only be carried out hole enlargement or undergauge, all can successfully connect, thereby application area is wider.＜3〉aspect cost of production: welding needs to consume multiple material usually, and cost is higher, and the utility model then only consumes and can produce by batch thereby cheap connecting ring, so cost is lower.＜4〉aspect manufacturing efficiency: welding not only expends much manually usually, and back work is more, thereby manufacturing efficiency is lower.Various work of the present utility model all can in time be finished on production line, so manufacturing efficiency is higher.＜5〉adopting the utility model is to operate at normal temperatures, does not produce any harmful gas and dust, therefore, compares with welding, has improved operating environment.In sum, adopt the utility model to compare with now general welding method, have many-sided superiority, its application prospect is very extensive.
The utility model is described in further detail below in conjunction with embodiment.This embodiment is that the utility model goods are used for the situation that refrigerator refrigeration pipe aluminum pipe is connected with copper pipe.The aluminium tube material that needs to connect is a commercial-purity aluminium, and the copper pipe material is a fine copper, and the cross dimension of aluminum pipe and copper pipe is basic identical, is external diameter 7.5mm, wall thickness 0.8mm.The concrete structure, manufacture method, using method and the method for inspection that are used to connect the connecting ring of aluminum pipe and copper pipe are described as follows one by one.＜1〉concrete structure.Fig. 5 is the structural drawing of used connecting ring among this embodiment.The important technological parameters division of forming its endoporus is as follows: the maximum diameter d of big circular cone
1=9.8mm, cylindrical diameter d
2=8.7mm, the minimum diameter d of roundlet frustum
3=8.6mm, connecting ring total length L=9.0mm, big circular cone length L
1=5.6mm, cylinder length L
2=1.6mm, conicle platform length L
3=1.2mm, the tolerance of above-mentioned various sizes all is controlled to be ± 0.05mm; The angle α of big circular cone face and axis is 5 ° ± 1 °, the angle β of conicle table top and axis is controlled to be 3 ° ± 30 '; It is bright and clean to make every effort to bore area, visual visible cutter trade must not be arranged and scratch vestige.The wall thickness of connecting ring is controlled according to connecting ring outer wall bottom land to the thickness of endoporus cylinder surface, and to help guaranteeing the requirement of concrete purposes to connecting ring intensity, this thickness t is 1.85mm, therefore, and the diameter D at the bottom of the connecting ring external slot
1=12.4 ± 0.05mm.Other sizes and surface roughness for the connecting ring outside then do not have strict demand, but control outside maximum dimension D=13 ± 0.05mm, as ordering raw-material foundation.＜2〉manufacture method.According to what produce plastic deformation in using connecting ring connection tubing process will be this concrete condition of fine aluminium tubing, and the selection of material intensity and hardness are higher than the aluminium alloy pipe of fine aluminium as the raw material of making connecting ring.This material can obtain intensity and the hardness more much higher than fine aluminium tubing by the strictness control to its Chemical composition and heat treating regime, thereby can force fine aluminium tubing to produce plastic deformation.The concrete grammar of making this kind connecting ring is turning processing, at first finishes processing to its endoporus with special-purpose lathe tool, with another lathe tool its outer surface is processed, thereby is reached every technical requirements of design.＜3〉using method.At first the end grown of about 20mm of the aluminum pipe that needs are connected utilizes flaring machine to expand its internal diameter to 7.7 ± 0.05mm; Then it is assembled up with the copper pipe that needs to be connected with connecting ring, and the sealing fluid that dropping is selected on the copper pipe outer surface when copper pipe just inserts aluminum pipe, utilize the insertion of copper pipe sealing fluid to be coated on the surface of contact of two kinds of tubing (adapting to the refrigeration pipe situation very high), so obtained situation shown in Figure 3 to sealing requirements; Re-use special tool,, apply external force F on the one hand according to position shown in Figure 3
1Fixedly the relative position of aluminum pipe and copper pipe applies external force F on the other hand
2Promote connecting ring, force the aluminum pipe end to produce plastic deformation, be full of the space of connecting ring inwall and copper pipe outer surface formation rapidly, occurred situation shown in Figure 4 at last, just finished being connected of aluminum pipe and copper pipe.＜4〉method of inspection.The method of inspection of copying refrigerator manufacturing enterprise that refrigeration pipe is carried out is tested, and obviously is the most convictive.This method comprises two Interventions Requested.The first, tensility check: have the sample of connecting ring attachment portion in the middle of cutting, be clamped in and carry out tensile test on the tensile testing machine, thereby obtain the pulling force numerical value that the joint can be born.The second, sealability check: have the sample of connecting ring attachment portion in the middle of cutting, the one end is stopped up shut, and reach the gas of 1MPa, detect the joint with leak detector again and have or not leakage phenomenon from the other end charged pressure.