阅读说明：本技术 一种聚醚醚酮管接头及其焊接方法 (Polyether-ether-ketone pipe joint and welding method thereof ) 是由 陈奇海 霍绍新 方良超 殷东平 瞿启云 姚芮 李磊 许春停 于 2020-05-11 设计创作，主要内容包括：本发明公开一种聚醚醚酮管接头,涉及管接头技术领域,包括接头本体,所述接头本体的两端设有开口,所述接头本体的内壁内设有环形凹槽和限位件,所述环形凹槽位于限位件与接头本体端部之间。本发明还提供上述聚醚醚酮管接头的焊接方法。本发明的有益效果在于：本发明的聚醚醚酮管接头可以与聚醚醚酮管匹配,便于随后的焊接,采用本发明的聚醚醚酮管接头焊接面积大,焊缝连接强度高、密封性好,且焊缝外形美观,不存在溢胶料的堆积,焊接过程中通过限位件控制聚醚醚酮直管的进给深度。(The invention discloses a polyether-ether-ketone pipe joint, which relates to the technical field of pipe joints and comprises a joint body, wherein openings are formed in two ends of the joint body, an annular groove and a limiting piece are arranged in the inner wall of the joint body, and the annular groove is positioned between the limiting piece and the end part of the joint body. The invention also provides a welding method of the polyether-ether-ketone pipe joint. The invention has the beneficial effects that: the polyether-ether-ketone pipe joint can be matched with a polyether-ether-ketone pipe, so that subsequent welding is facilitated, the polyether-ether-ketone pipe joint is large in welding area, high in welding seam connection strength, good in sealing performance, attractive in appearance of a welding seam, free of accumulation of excessive glue materials, and the feeding depth of a polyether-ether-ketone straight pipe is controlled through the limiting piece in the welding process.)

1. A polyether-ether-ketone pipe joint is characterized in that: the connector comprises a connector body, openings are arranged at two ends of the connector body, an annular groove and a limiting part are arranged in the inner wall of the connector body, and the annular groove is located between the limiting part and the end part of the connector body.

2. The PEEK pipe joint of claim 1, wherein: the one end that connects the body is equipped with the connecting piece, the connecting piece is the column, the external diameter of connecting piece is greater than the external diameter that connects the body, the connecting piece inside wall is equipped with interior groove, the interval of locating part to connecting piece is less than the interval of annular groove to connecting piece.

3. The PEEK pipe joint of claim 1, wherein: the outer diameter of the joint body is 12-38mm, and the wall thickness of the joint body is 1-1.5 mm.

4. The PEEK pipe joint of claim 3, wherein: the width of the annular groove is 1-2mm, and the depth of the annular groove is 0.2-0.5 mm.

5. A welding method using a PEEK pipe joint according to any one of claims 1 to 4, characterized in that: the method comprises the following steps:

(1) adjusting the inner diameter of the joint body to be 0.1-0.3mm smaller than the outer diameter of the polyether-ether-ketone pipe, coaxially arranging the polyether-ether-ketone pipe and the polyether-ether-ketone pipe joint, fixing the polyether-ether-ketone pipe, moving the rotating polyether-ether-ketone joint to be close to the polyether-ether-ketone pipe, and enabling the polyether-ether-ketone pipe to extend into the rotating polyether-ether-ketone pipe joint;

(2) and controlling the distance of the welding end of the polyether-ether-ketone pipe extending into the polyether-ether-ketone pipe joint, and stopping the movement and rotation of the polyether-ether-ketone pipe joint when the distance between the welding end of the polyether-ether-ketone pipe and the limiting part is 1-3mm, so as to finish welding.

6. The method of welding a PEEK pipe joint of claim 5, wherein: before the PEEK pipe is contacted with the PEEK pipe joint, the feeding speed of the PEEK joint is adjusted to be 800mm/min for 600-materials, and the rotating speed of the PEEK joint is adjusted to be 2000r/min for 1200-materials; after the PEEK pipe is contacted with the PEEK pipe joint, the feeding speed of the PEEK pipe joint is adjusted to be 350-1800 mm/min, and the rotating speed of the PEEK pipe joint is adjusted to be 800-1800 r/min.

7. The method of welding a PEEK pipe joint of claim 5, wherein: the number of annular groove is 1 at least, be the welding part between this end of body of joint and the locating part, the annular groove distributes along welding part's axis length direction equidistance.

8. The method of welding a PEEK pipe joint of claim 6, wherein: the external diameter of connecting the body is 25mm, and the wall thickness that connects the body is 1.5mm, the width of annular groove is 1mm, and the degree of depth of annular groove is 0.5 mm.

9. The method of welding a PEEK pipe joint of claim 6, wherein: the external diameter of connecting the body is 38mm, and the wall thickness that connects the body is 1.5mm, the width of annular groove is 2mm, and the degree of depth of annular groove is 0.5 mm.

10. The method of welding a PEEK pipe joint of claim 5, wherein: the fixing piece is sleeved on the outer side wall of the polyether-ether-ketone pipe joint.

Technical Field

The invention relates to the technical field of pipe joints, in particular to a polyether-ether-ketone pipe joint and a welding method thereof.

Background

PEEK is a typical special engineering plastic and has high mechanical strength, excellent impact resistance, fatigue resistance and the like. Compared with the traditional aluminum alloy, the PEEK material shows strong application potential in the aspects of design freedom, manufacturing convenience, light weight, high strength and the like, and is one of the engineering plastics with the optimal comprehensive performance which are acknowledged in the world. PEEK molded pipelines have been widely used in various fields such as aviation, automobiles, paint delivery and the like. In order to realize the welding of the plastic pipeline, various methods such as a hot plate, ultrasound, laser and the like are available at present, however, for the PEEK pipeline with higher pipe internal pressure requirement, the traditional welding structure form, namely end face welding, is difficult to meet the performance requirement of high strength and high reliability, and particularly, in complex and severe environments such as vibration, high and low temperature impact and the like, a greater pipeline leakage risk exists. Laser welding has strict requirements on the light absorption and heat absorption performance of pipeline materials, ultrasonic welding has certain requirements on the structure of the end face, and circular pipe plastics are difficult to form a sealing weld joint. Fusion welding using plastic friction heating is a preferred method. However, conventional friction welding has limitations when applied to PEEK tubing.

For example, patent publication No. CN104476770A discloses thermal welding of end faces of equal-diameter pipes by using frictional heat, on one hand, this method is only suitable for common low-melting-point common engineering plastics, such as PA, PC, etc., and is not suitable for PEEK special engineering plastics with high melting point and high strength. On the other hand, the strength of a welding seam formed by end face butt welding is weak, particularly, the wall thickness of the welding seam is only about 1mm when a thin-wall pipe is welded, and the welding seam is difficult to realize complete sealing. Socket welding is a method often adopted for welding thin-walled pipes, and currently, common socket welding adopts heating elements such as a hot plate to respectively heat a pipe fitting and a joint, and then socket pressing welding is carried out. However, the method easily causes the fused tube body to be adhered to the heating element, the heating time is difficult to control accurately, and after long-time work, impurities of the heating element seriously affect subsequent quality welding.

Conventional plastic/non-metal welding methods include hot plate, ultrasonic, laser, infrared, ultraviolet, electromagnetic induction, resistance hot melt, rotary hot melt. The PEEK material is non-transparent and has high melting point, the welding seam is designed at the side surface of the cylinder contacted with the straight pipe and the pipe joint, the welding surface is required to be large, and the existing plastic welding method can not realize effective welding.

Disclosure of Invention

The invention aims to solve the technical problem that the traditional structure of the polyether-ether-ketone pipe joint cannot realize effective welding, and provides the polyether-ether-ketone pipe joint.

The invention solves the technical problems through the following technical means:

the invention provides a polyether-ether-ketone pipe joint which comprises a joint body, wherein openings are formed in two ends of the joint body, an annular groove and a limiting piece are arranged on the inner wall of the joint body, and the annular groove is located between the limiting piece and the end part of the joint body.

The working principle is as follows: fixing the straight pipe of polyether-ether-ketone, rotating the joint of polyether-ether-ketone, and moving the joint of polyether-ether-ketone to approach the straight pipe of polyether-ether-ketone, the two are fusion welded under interference fit, after welding, the fused mass is evenly distributed in the annular groove of the joint body, forming the sealing connection of the side face, and ensuring the welding air tightness.

Has the advantages that: the PEEK pipe joint can be matched with a PEEK pipe, so that subsequent welding is facilitated, and the feeding depth of the PEEK straight pipe is controlled by the limiting piece in the welding process.

Preferably, the joint body is in a hollow column shape, and the inner diameter of the joint body is 0.1-0.3mm smaller than the outer diameter of the polyether-ether-ketone straight pipe.

Has the advantages that: the interference fit amount of the inner wall size of the polyether-ether-ketone pipe joint and the outer diameter size of the polyether-ether-ketone straight pipe is ensured to be 0.1-0.3 mm.

Preferably, the outer diameter of the joint body is 12-38mm, and the wall thickness of the joint body is 1-1.5 mm.

Preferably, the annular groove is arranged coaxially with the joint body.

Preferably, the width of the annular groove is 1-2mm, and the depth of the annular groove is 0.2-0.5 mm.

Preferably, the number of annular grooves is at least 1, be the welding part between this end of joint body and the locating part, the annular groove is along the axial length direction equidistance distribution of welding part.

Preferably, the outer diameter of the joint body is 12mm, the wall thickness of the joint body is 1mm, the width of the annular groove is 1mm, the depth of the annular groove is 0.5mm, and the length of the welding part along the axis of the joint body is 15-20 mm.

Preferably, the outer diameter of the joint body is 25mm, the wall thickness of the joint body is 1.5mm, the width of the annular groove is 1mm, the depth of the annular groove is 0.5mm, and the length of the welding part along the axis of the joint body is 15-20 mm.

Preferably, the outer diameter of the joint body is 38mm, the wall thickness of the joint body is 1.5mm, the width of the annular groove is 2mm, the depth of the annular groove is 0.5mm, and the length of the welding part along the axis of the joint body is 15-20 mm.

Preferably, the one end that connects the body is equipped with the connecting piece, the connecting piece is the column, the external diameter of connecting piece is greater than the external diameter that connects the body, the connecting piece inside wall is equipped with interior groove, the interval of locating part to connecting piece is less than the interval of annular groove to connecting piece.

Has the advantages that: the inner groove of the inner side wall of the connecting piece is used for being matched with the hydraulic balance distributor, and then the outer side wall of the connecting piece is provided with a nut for fastening the connection between the connecting piece and the hydraulic balance distributor.

Preferably, the distance between the limiting part and the connecting part is 1-3 mm.

When the polyether-ether-ketone tube is in contact with the limiting piece, the welding is stopped, and enough space is reserved for the overflow of the solder.

The invention aims to solve the technical problem that the traditional structure of the polyether-ether-ketone pipe joint is difficult to meet the welding requirement, and provides a welding method adopting the polyether-ether-ketone pipe joint.

A welding method of a polyether-ether-ketone pipe joint comprises the following steps:

(1) adjusting the inner diameter of the joint body to be 0.1-0.3mm smaller than the outer diameter of the polyether-ether-ketone pipe, coaxially arranging the polyether-ether-ketone pipe and the polyether-ether-ketone pipe joint, fixing the polyether-ether-ketone pipe, enabling the polyether-ether-ketone pipe joint to rotate and approach the polyether-ether-ketone straight pipe along the same axis, and enabling the polyether-ether-ketone pipe to extend into the rotating polyether-ether-ketone pipe joint;

(2) and controlling the distance of the welding end of the polyether-ether-ketone pipe extending into the polyether-ether-ketone pipe joint, and stopping the movement and rotation of the polyether-ether-ketone joint when the distance between the welding end of the polyether-ether-ketone pipe and the limiting part is 1-3mm, so as to finish welding.

Has the advantages that: the welding method adopted by the invention can ensure large-area welding of the cylindrical surface at the contact position, has high weld strength, good sealing performance, controllable flash and no defect in the interior of the weld, and meets the working condition requirements of vibration and high-temperature severe environment; the adopted welding method can weld polyether ether ketone (PEEK) with high melting point (not less than 340 ℃) and modified materials thereof; the adopted pipe joint design and sealing welding method has no limit to the size of the liquid cooling pipeline system, and can extend to the pipeline connection arranged more than or equal to 5 meters; the adopted welding method does not need to increase an additional heating system or an additional welding auxiliary agent or auxiliary material, and is simple to operate and high in efficiency.

Preferably, the joint body is in a hollow column shape, and the inner diameter of the joint body is 0.1-0.3mm smaller than the outer diameter of the polyether-ether-ketone pipe.

Has the advantages that: the interference fit amount of the inner wall size of the polyether-ether-ketone pipe joint and the outer diameter size of the polyether-ether-ketone pipe is ensured to be 0.1-0.3 mm.

Preferably, the outer diameter of the joint body is 12-38mm, and the wall thickness of the joint body is 1-1.5 mm.

Preferably, the annular groove is arranged coaxially with the joint body.

Preferably, the width of the annular groove is 1-2mm, and the depth of the annular groove is 0.2-0.5 mm.

Preferably, the number of annular grooves is at least 1, be the welding part between this end of joint body and the locating part, the annular groove is along the axial length direction equidistance distribution of welding part.

Preferably, the length of the welding portion along the axis of the joint body is 15-20 mm.

Preferably, the external diameter of joint body is 12mm, and the wall thickness of joint body is 1mm, the width of annular groove is 1mm, the degree of depth of annular groove is 0.5 mm.

Preferably, the external diameter of the joint body is 25mm, the wall thickness of the joint body is 1.5mm, the width of the annular groove is 1mm, and the depth of the annular groove is 0.5 mm.

Preferably, the outer diameter of the joint body is 38mm, the wall thickness of the joint body is 1.5mm, the width of the annular groove is 2mm, and the depth of the annular groove is 0.5 mm.

Preferably, before the PEEK pipe is contacted with the PEEK pipe joint, the feeding speed of the PEEK joint is adjusted to be 800mm/min for 600-one, and the rotating speed of the PEEK joint is adjusted to be 2000-one for 1200-one; after the PEEK pipe is contacted with the PEEK pipe joint, the feeding speed of the PEEK pipe joint is adjusted to be 350-1800 mm/min, and the rotating speed of the PEEK pipe joint is adjusted to be 800-1800 r/min.

Preferably, the fixing piece is sleeved on the outer side wall of the polyether-ether-ketone pipe joint.

Has the advantages that: the bulge deformation caused by the outward expansion of the flash when the PEEK pipe joint is melted at high temperature is prevented through the sleeved fixing piece.

Preferably, the fixing member is a snap ring.

Preferably, a gasket or a film is arranged between the clamping ring and the outer side wall of the polyether-ether-ketone pipe joint.

Has the advantages that: and a gasket or a film is added to ensure that the clamping ring clamps the polyether-ether-ketone pipe joint and prevent the polyether-ether-ketone pipe joint from falling off in the rotating process.

Preferably, before the PEEK pipe with the outer diameter of 12mm contacts the PEEK pipe joint, the feeding speed of the PEEK joint is adjusted to be 600-800mm/min, and the rotating speed of the PEEK joint is adjusted to be 1200-2000 r/min; after the PEEK pipe is contacted with the PEEK pipe joint, the feeding speed of the PEEK pipe joint is adjusted to be 350-550mm/min, and the rotating speed of the PEEK pipe joint is adjusted to be 850-1200 r/min.

Preferably, before the PEEK pipe with the outer diameter of 25mm contacts the PEEK pipe joint, the feeding speed of the PEEK joint is adjusted to be 600-800mm/min, and the rotating speed of the PEEK joint is adjusted to be 1200-2000 r/min; after the PEEK pipe is contacted with the PEEK pipe joint, the feeding speed of the PEEK pipe joint is adjusted to be 350-550mm/min, and the rotating speed of the PEEK pipe joint is adjusted to be 900-1400 r/min.

Preferably, before the PEEK pipe with the outer diameter of 38mm contacts the PEEK pipe joint, the feeding speed of the PEEK joint is adjusted to be 600-800mm/min, and the rotating speed of the PEEK joint is adjusted to be 1200-2000 r/min; after the PEEK pipe is contacted with the PEEK pipe joint, the feeding speed of the PEEK pipe joint is adjusted to be 350-1800 mm/min, and the rotating speed of the PEEK pipe joint is adjusted to be 800-1800 r/min.

Preferably, the tolerance of the outer diameter of the welding end of the polyether-ether-ketone pipe with the outer diameter of 12mm is within +/-0.1 mm, and the tolerance of the pipe wall of the polyether-ether-ketone pipe is within +/-0.1 mm.

Preferably, the tolerance of the outer diameter of the welding end of the polyetheretherketone pipe with the outer diameter of 25mm is within plus or minus 0.12mm, and the tolerance of the pipe wall of the polyetheretherketone pipe is within plus or minus 0.12 mm.

Preferably, the tolerance of the outer diameter of the welding end of the polyether-ether-ketone pipe with the outer diameter of 38mm is within +/-0.2 mm, and the tolerance of the pipe wall of the polyether-ether-ketone pipe is within +/-0.2 mm.

The invention has the advantages that:

(1) the welding method adopted by the invention can realize the fusion welding of the PEEK pipe joint and the PEEK pipe under the interference fit, and after the welding, the melt is uniformly distributed in the groove on the inner side wall of the PEEK pipe joint, so that the large-area welding of the cylindrical surface of the contact part can be ensured, the weld joint strength is high, the sealing performance is good, the flash is controllable, the inside of the weld joint is free from defects, and the working condition requirements of vibration and high-temperature severe environment are met;

(2) the adopted welding method can weld polyether ether ketone (PEEK) with high melting point (not less than 340 ℃) and modified materials thereof;

(3) the adopted pipe joint design and sealing welding method has no limit to the size of the liquid cooling pipeline system, and can extend to the pipeline connection arranged more than or equal to 5 meters;

(4) the adopted welding method does not need to increase an additional heating system or an additional welding auxiliary agent or auxiliary material, and is simple to operate and high in efficiency.

Drawings

Fig. 1 is a schematic cross-sectional structure view of a pipe joint of polyetheretherketone in embodiment 1 of the present invention;

fig. 2 is a schematic cross-sectional structure view of a pipe joint of polyetheretherketone in embodiment 2 of the present invention;

fig. 3 is a schematic cross-sectional structure view of a pipe joint of polyetheretherketone in embodiment 3 of the present invention;

FIG. 4 is a schematic view of the welding fit of the PEEK pipe joint and the PEEK pipe of the present invention;

FIG. 5 is a schematic structural view of a snap ring according to embodiment 4 of the present invention;

in the figure: a joint body 1; an annular groove 11; a stopper 12; a connecting member 13; a polyether ether ketone pipe 2; a first clamping tool 3; a first clamping tool 4; a snap ring 5; a snap ring body 51; a connecting plate 52.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are some embodiments of the present invention, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present.

It is noted that, in this document, relational terms such as first and second, and the like, if any, are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.