一种管路连接管件 Pipe connection pipe fitting
技术领域 Technical field
[0001 ]本发明属于工业领域， 涉及一种将管子连接成管路的连接管件， 特别是涉及一种流体传输管路的连接管件。  The present invention belongs to the field of industry, and relates to a connecting pipe member for connecting pipes into pipes, and more particularly to a connecting pipe member for a fluid conveying pipe.
背景技术 BACKGROUND OF THE INVENTION
管与管、 管与其它管路连接管件之间的连接， 有捍接连接， 螺紋连接， 法兰连接， 扩喇叭口连接， 卡套式管接头连接等 方法。 其中扩喇叭口连接,也称扩口连接， 翻边连接， 具有连接工艺要求、 连接成本较低， 连接方法便捷,可用于低硬度 薄壁金属管路的优点， 伹存在着密封压力较低， 密封可靠性较差的缺点， 通常仅能应用在密封压力低于 8MPa的管路连 接上。 扩喇叭口连接管件包括一个螺母， 一个带外锥台的接头， 有时还带有衬套。 扩喇叭口连接的密封原理是将螺母套 进连接管端口， 然后将端口扩成连接管喇叭口， 通过螺母上的内螺纹与接头上的外螺紋连接,由螺母内锥孔将连接管喇 叭口挤压在接头外锥台上形成密封连接。 扩喇叭口连接的缺点是喇叭口容易被扩裂， 喇叭口较粗糙且承压能力较弱， 喇 叭口与连接管结合处受到腐蚀和疲劳振动时， 易出现松动、 破裂而泄漏， 现有技术有采用衬套加以保护的设计， 但衬套 仅对喇叭口作用， 衬套与连接管之间为松动配合， 存在间隙， 与外界是相通的， 外界大气， 7j气， 污水对喇叭口与连接 管结合处的侵蚀， 始终存在， 天长日久， 侵蚀到了一定程度时， 喇叭口与连接管结合处就会因腐蚀产生破裂、 松动而泄 漏， 特别在接头与连接管为异种金属的连接时， 存在着更为严重的电化学腐蚀， 腐蚀破坏尤为明显， 如在铜接头与铝连 接管的连接中， 铜接头与铝连接管喇叭口直接接触而产生铜铝间的电化学腐蚀， 喇叭口密封处将很快产生破裂泄漏， 因 此， 扩喇叭口连接方式是不可直接应用于异种金属材料的连接上的。 此外管子连接工作时往往处于一定的振动状态， 振 动带来的振动疲劳累积到一定程度时会松动连接， 降低密封性能， 直到彻底失去密封， 扩喇叭口连接仅在喇叭口处产生 密封， 一且喇叭口密封产生泄漏， 就意味着连接管件失去密封。 因此， 寻找一种连接密封压力更高， 密封性能更可靠 ， 防腐蚀， 防振， 防松动性能优越， 可直接用于异种金属间连接而无电化学腐蚀的连接管件,就成了人们一直渴望解决 的技术难题了。 The connection between the pipe and the pipe, the pipe and other pipe connection fittings, such as the splicing connection, the screw connection, the flange connection, the flare connection, the ferrule connection. The flared port connection, also called the flared connection, the flanged connection, has the connection process requirement, the connection cost is low, the connection method is convenient, and the utility model can be used for the advantages of the low-hardness thin-wall metal pipe, and the sealing pressure is low. The disadvantage of poor sealing reliability is usually only applicable to pipe connections with a sealing pressure of less than 8 MPa. The flared connection fittings include a nut, a fitting with an outer frustum, and sometimes a bushing. The sealing principle of the flared port connection is to put the nut into the connecting pipe port, and then expand the port into the connecting pipe bell mouth, and connect the internal thread on the nut with the external thread on the joint, and the inner cone hole of the nut will connect the pipe bell mouth. The extrusion forms a sealed connection on the outer frustum of the joint. The disadvantage of the flared port connection is that the bell mouth is easily cracked, the bell mouth is rough and the pressure bearing capacity is weak, and when the joint of the bell mouth and the connecting pipe is subjected to corrosion and fatigue vibration, it is prone to looseness, cracking and leakage, and the prior art There is a bushing to protect the design, but the bushing only acts on the bell mouth. The bushing and the connecting pipe are loosely matched, there is a gap, and the outside is in communication with the outside atmosphere, 7j gas, sewage to the bell mouth and connection The erosion at the joint of the pipe is always present. For a long time, when the erosion reaches a certain level, the joint between the bell mouth and the connecting pipe will leak due to corrosion, and loose, especially when the joint and the connecting pipe are dissimilar metals. More serious electrochemical corrosion, corrosion damage is particularly obvious, such as in the connection of the copper joint and the aluminum connecting pipe, the copper joint and the aluminum connecting pipe bell mouth directly contact to produce electrochemical corrosion between copper and aluminum, the bell mouth seal will Cracking leaks quickly, so the flare connection is not directly applicable to the connection of dissimilar metal materials.In addition, when the pipe is connected, it is often in a certain vibration state. When the vibration fatigue caused by the vibration accumulates to a certain extent, it will loosely connect and reduce the sealing performance until the seal is completely lost. The flare connection only produces a seal at the bell mouth. Leakage in the flare seal means that the connecting fitting loses its seal. Therefore, looking for a connection seal with higher pressure, more reliable sealing performance, anti-corrosion, anti-vibration, anti-loose performance, can be directly used for connecting between dissimilar metals without electrochemical corrosion, it has become a long-awaited The technical problem solved.
发明内容 Summary of the invention
 本发明的目的正是针对上述扩喇叭口连接存在的问题， 在不改变现有连接接头外锥台结构的前提下， 而专门提 供的管路连接管件， 彻底解决了上述扩喇叭口连接方法存在的问题： 连接密封压力较低， 密封性能可靠性差， 不能防腐 蚀， 防振、 防松动性能低， 不可直接用于异种金属间管路连接的问题。  The object of the present invention is to solve the problem of the above-mentioned flared port connection, and the pipe connecting pipe fittings specially provided without completely changing the structure of the outer frustum of the existing connecting joint completely solves the above-mentioned flared bell mouth. Problems with the connection method: The connection sealing pressure is low, the sealing performance is poor, the corrosion resistance, the anti-vibration and the anti-loose performance are low, and it cannot be directly used for the connection of the dissimilar metal pipes.
本发明的目的是通过以下方式来实现的： The object of the invention is achieved in the following ways:
1， 一种管路连接管件， 包括螺母， 接头， 接头外锥台和连接管喇叭口， 其特征是： 螺母设有内锥孔， 螺母内锥孔 内设有配套使用的卡套， 卡套为中空的卡套套孔， 卡套套孔底部设有卡套内锥孔， 卡套内锥孔由卡套内圆柱孔和卡套内 锥孔喇叭槽组成， 卡套内圆柱孔设有密封锥面， 卡套套孔壁与卡套外锥斜面组成卡套锥斜角， 接头外锥台挤压密封锥面 实现锥面密封， 接头外锥台挤压卡套内锥孔喇叭槽中的连接管喇叭口实现喇叭槽密封， 螺母内锥孔挤压卡套从而挤压连 接管实现卡套密封。 1, a pipe connecting pipe fitting, comprising a nut, a joint, a joint outer frustum and a connecting pipe bell mouth, wherein: the nut is provided with an inner cone hole, and the inner cone hole of the nut is provided with a matching ferrule, the ferrule The hollow ferrule sleeve hole is provided with a ferrule inner taper hole at the bottom of the ferrule sleeve hole, and the inner cone hole of the ferrule sleeve is composed of the inner cylindrical hole of the ferrule and the inner cone hole of the ferrule, and the inner cylindrical hole of the ferrule is provided with a sealing cone surface. The sleeve wall of the sleeve and the outer cone of the sleeve form a ferrule angle of the ferrule, the outer cone of the joint is pressed to seal the cone surface to realize the cone seal, and the outer cone of the joint squeezing sleeve is connected with the horn of the cone hole in the horn of the ferrule. The mouth realizes the speaker slot seal, and the inner cone hole of the nut presses the ferrule to squeeze the connecting tube to realize the ferrule sealing.
 2， 卡套外锥钭面上设有弹性变形槽。  2, the outer sleeve of the ferrule is provided with an elastic deformation groove.
 3, 卡套内锥孔喇叭槽锥斜角大于接头外锥台锥斜角。  3, the inner diameter of the cone hole of the ferrule is larger than the angle of the outer cone of the joint.
 4 , 卡套内圆柱孔直径小于接头外锥台底径。  4, the diameter of the inner cylindrical hole of the ferrule is smaller than the diameter of the outer frustum of the joint.
 5, 卡套内圆柱孔孔深大于连接管壁厚。  5, the inner hole of the ferrule is deeper than the wall thickness of the connecting pipe.
 6, 螺母内锥孔长度和卡套长度均大于 4mm。  6. The inner taper hole length and the ferrule length of the nut are both greater than 4 mm.
 7, 螺母内锥孔长度大于等于卡套长度。  7. The length of the inner cone of the nut is greater than or equal to the length of the ferrule.
[001 1 ] 8 , 卡套为软态。 [001 1 ] 8 , The card sleeve is soft.
 9 , 卡套内圆柱孔密封锥面宽度大于 0.4mm。  9, the inner diameter of the cylindrical hole sealing cone of the ferrule is greater than 0.4 mm.
本发明由接头外锥台挤压卡套内圆柱孔上的密封锥面实现锥面密封； 接头外锥台挤压卡套内锥孔喇叭槽中的连 接管喇叭口实现喇叭槽密封和螺母内锥孔挤压卡套从而挤压连接管实现卡套密封组成。 本发明的锥面密封， 喇叭槽密封 和卡套密封的三重密封设计， 是一个互为作用， 互为因果的多重密封结构。 卡套套孔壁与卡套外锥斜面组成卡套锥斜角 是指卡套套孔壁的投影线与卡套外锥斜面投影线的夹角， 因此， 卡套锥斜角也就是卡套外锥斜面的锥斜角， 在实施时卡 套锥斜角是指用来锥进螺母内锥孔与连接管之间密封的卡套锥斜角所形成的卡套切入角。 本发明的锥斜角均为相应的锥 孔， 锥台， 卡套， 锥面， 喇叭口， 喇叭槽的中心线与其锥斜面投影线的夹角， 在连接密封时， 卡套锥斜角被挤压位移的 方向与螺母连接移动的方向相反， 当卡套锥斜角被挤压在螺母内锥孔和连接管之间的卡套密封达到一定的密封压力时 , 卡套锥斜角会受到巨大的阻力而停止位移， 此时， 在接头外锥台的挤压作用下,实现锥面密封和喇叭槽密封，当锥面密 封和喇叭槽密封达到一定的密封压力时,螺母通过连接接头继续向接头方向移动,对卡套外锥钭面继续施压,使得卡套锥钭 角继续收缩而连续挤压连接管，进一步提高了卡套密封能力。 原有的扩喇叭口连接， 连接力矩过小， 过大， 过猛， 喇叭 口制作， 喇叭口材料质量， 壁厚等因素， 都有可能造成喇叭口破裂而不能密封， 因而扩喇叭口连接对连接力矩的大小要 求较严格， 增大了连接难度， 但本发明的多重密封结构， 对连接力矩没有严格的要求， 连接时尽可用大力矩连接， 当出
现力矩过大使得喇叭口破裂的极端情况时， 对喇叭槽密封来讲， 密封是失败了， 但过大的力矩， 却会起到进一步提高卡 套密封， 锥面密封的作用， 密封性能反而会得到进一步提高。 卡套密封， 锥面密封的增强， 会在连接管轴向对连接管产 生一个方向相反的作用力， 起到互为保护的作用， 从而又进一步提高了密封的可靠性。 螺母内锥孔内设置有配套使用的 卡套， 是指螺母内锥孔长度，螺母内锥孔锥钭角与卡套长度， 卡套锥钭角作匹配设计， 以使卡套密封时获得理想的密封 性能， 本发明实施时，建议卡套锥钭角略小于螺母内锥孔锥钭角 1到 5度，螺母内锥孔长度大于等于卡套长度。 配套使用表 明， 螺母内锥孔与卡套二者在实现本发明目的上互为作用， 缺一不可。  The invention adopts a sealing cone surface on the inner cylindrical hole of the ferrule sleeve of the joint outer frustum to realize a cone sealing; the joint outer cone table squeezes the connecting tube horn in the inner cone hole of the ferrule to realize the horn groove sealing And the inner cone hole of the nut presses the ferrule so as to squeeze the connecting tube to realize the ferrule sealing composition. The triple seal design of the cone seal, the bell groove seal and the ferrule seal of the present invention is a mutual sealing and mutual causal multiple seal structure. The sleeve hole wall and the outer sleeve cone surface of the card sleeve constitute a ferrule cone angle, which is the angle between the projection line of the ferrule sleeve wall and the projection line of the outer cone of the ferrule, therefore, the slant angle of the ferrule is the outer sleeve of the ferrule The taper angle of the bevel, when implemented, the ferrule bevel angle refers to the nip angle of the ferrule formed by the bevel angle of the ferrule used to seal the inner tapered hole between the nut and the connecting pipe. The taper angle of the present invention is the angle between the corresponding tapered hole, the frustum, the ferrule, the tapered surface, the bell mouth, the center line of the horn groove and the projection line of the cone inclined surface, and the slant angle of the ferrule is The direction of the extrusion displacement is opposite to the direction in which the nut is connected. When the ferrule cone angle is squeezed between the cone of the nut and the ferrule seal between the connecting tube reaches a certain sealing pressure, the slant angle of the ferrule is affected. The displacement is stopped by the huge resistance. At this time, the cone seal and the bell groove seal are realized under the pressing action of the outer frustum of the joint. When the cone seal and the bell groove seal reach a certain sealing pressure, the nut continues through the joint. Moving in the direction of the joint, the pressure is continued on the outer cone surface of the ferrule, so that the ferrule angle of the ferrule continues to shrink and the connecting tube is continuously squeezed, thereby further improving the sealing ability of the ferrule. The original flared port connection, the connection torque is too small, too large, too strong, the bell mouth is made, the material quality of the bell mouth, the wall thickness and other factors may cause the bell mouth to rupture and cannot be sealed, so the flare connection is The connection torque is required to be stricter and the connection difficulty is increased. However, the multiple sealing structure of the present invention has no strict requirements on the connection torque, and the connection can be connected with a large torque. In the extreme case where the torque is too large and the bell mouth is broken, the seal fails for the bell groove seal, but the excessive torque will further improve the ferrule seal and the cone seal, and the sealing performance instead Will be further improved. The ferrule seal and the enhancement of the cone seal will exert an opposite force on the connecting pipe in the axial direction of the connecting pipe, thereby playing the role of mutual protection, thereby further improving the reliability of the sealing. The inner ferrule hole of the nut is provided with a matching ferrule, which refers to the length of the inner taper hole of the nut, the taper angle of the cone inside the nut and the length of the ferrule, and the matching angle of the ferrule is matched to design, so that the ferrule is sealed and ideally obtained. The sealing performance of the present invention is suggested to be slightly smaller than the taper angle of the taper hole of the nut by 1 to 5 degrees, and the length of the taper hole of the nut is greater than or equal to the length of the sleeve. The matching use shows that both the inner cone hole and the ferrule of the nut play each other in the purpose of achieving the object of the invention, and are indispensable.
卡套内锥孔由卡套内圆柱孔和卡套内锥孔喇叭槽组成。 在卡套内圆柱孔直径小于接头外锥台底径时，接头外锥台 就可挤压到卡套内圆柱孔上的密封锥面， 实现锥面密封。 卡套内圆柱孔孔深要确保接头外锥台首先挤压卡套内圆柱孔上 的密封锥面实施锥面密封， 然后在继续锥面密封的同时， 接触挤压连接管喇叭口实施喇叭槽密封， 通常取卡套内圆柱孔 孔深大于连接管壁厚即可满足上述要求， 以大于连接管壁厚 1.3倍为佳。 卡套内圆柱孔的形状也可为卡套内圆锥孔， 二 者没有实质区别， 都可达到接头外锥台挤压卡套内圆孔上的密封锥面实施锥面密封的目的。 锥面密封能否达到理想的密 封效果， 取决于形成锥面密封的两个密封面的工艺结构， 本发明的锥面密封的两个密封面， 一个为接头外锥台， 另一个 为卡套内圆柱孔上的密封锥面， 如果没有在卡套内圆柱孔上设有专门的密封锥面， 锥面密封时， 接头外锥台挤压密封的 是卡套内圆柱孔孔端口， 而孔端口为直角尖角， 很难保证在锥面密封时达到要求的密封效果， 而在卡套内圆柱孔上设有 专门的密封锥面， 就可使得形成锥面密封的两个密封面完全达到理想的锥面密封的工艺要求， 从而达到理想的锥面密封 效果， 密封锥面的锥斜角应与接头外锥台的锥斜角相等或相近， 密封锥面的宽度要大于 0.4mm以上， 锥面密封才能达 到理想的密封效果。 在卡套内锥孔上设有卡套内锥孔喇叭槽， 将连接管喇叭口置于卡套内锥孔喇叭槽内产生喇叭槽密封 , 喇叭槽密封的密封性比现有扩喇叭口连接的密封性更高， 更可靠。 连接时连接管喇叭口大小应根据卡套内锥孔喇叭槽 的大小制作， 以喇叭口最大径向直径略小于卡套内圆柱孔直径，被完全置于卡套内锥孔喇叭槽中为佳。  The inner cone hole of the ferrule is composed of a cylindrical hole in the ferrule and a horn groove in the inner sleeve of the ferrule. When the diameter of the cylindrical hole in the ferrule is smaller than the bottom diameter of the outer frustum of the joint, the outer frustum of the joint can be pressed to the sealing cone surface on the inner cylindrical hole of the ferrule to realize the cone sealing. The depth of the inner hole of the sleeve of the ferrule should ensure that the outer frustum of the joint firstly presses the sealing cone surface on the inner cylindrical hole of the ferrule to implement the cone sealing, and then, while continuing the conical sealing, the horn of the squeezing connecting tube is implemented to implement the horn groove. Sealing, usually the inner hole of the ferrule is deeper than the wall thickness of the connecting pipe to meet the above requirements, and is preferably 1.3 times larger than the wall thickness of the connecting pipe. The shape of the inner cylindrical hole of the ferrule can also be a tapered hole in the ferrule, and the two are not substantially different, and the sealing cone surface on the inner hole of the outer ferrule pressing ferrule of the joint can be tapered to perform the cone sealing. Whether the tapered seal can achieve the desired sealing effect depends on the process structure of the two sealing faces forming the tapered seal, the two sealing faces of the tapered seal of the present invention, one is the outer frustum of the joint, and the other is the ferrule The sealing cone on the inner cylindrical hole, if there is no special sealing cone on the cylindrical hole in the ferrule, when the cone is sealed, the outer cone of the joint squeezes and seals the inner hole of the ferrule, and the hole The port is a right-angled corner, it is difficult to ensure the required sealing effect in the cone sealing, and a special sealing cone is provided on the cylindrical hole in the ferrule, so that the two sealing faces forming the tapered sealing can be completely achieved. The ideal cone sealing process requirements, so as to achieve the ideal cone sealing effect, the cone angle of the sealing cone surface should be equal or close to the cone angle of the outer frustum of the joint, and the width of the sealing cone surface should be greater than 0.4mm. Conical seals are used to achieve the desired seal. A cone inner hole of the ferrule is arranged on the inner hole of the ferrule, and the bell mouth of the connecting tube is placed in the horn of the ferrule in the ferrule to produce a horn groove seal, and the sealing of the horn groove is more than that of the existing flared port. The seal is higher and more reliable. When connecting, the size of the bell mouth of the connecting pipe should be made according to the size of the inner ring hole of the ferrule. The maximum radial diameter of the bell mouth is slightly smaller than the diameter of the inner cylindrical hole of the ferrule, and it is better to be completely placed in the horn of the ferrule. .
卡套外锥钭面上设有弹性变形槽,当螺母与接头连接时，螺母内锥孔与卡套外锥钭面挤压贴合,弹性变形槽形成空 隙，在喇叭槽密封时， 空隙处的卡套受到挤推力向外凸起,产生弹性变形,弹性变形蓄积的弹性能量将有效地吸收连接管的 振动,提高密封的抗振性,对温度变化引起的热涨冷缩,起到密封补偿作用， 特别是在接头， 卡套， 螺母， 连接管为不同材 料金属的连接应用场合时， 补偿作用更大， 确保了密封的可靠性。 弹性变形槽的设计形状可以为三角形， 内弧形， 也可 为其他形状， 只要满足连接密封时， 在卡套内锥孔喇叭槽与卡套套孔壁结合处的卡套外侧,形成卡套锥钭面与螺母内锥 孔之间的空隙凹槽即可。 实施时取凹槽的最大深度 0.2到 0.6mm， 宽度 2到 4mm为佳。  The outer sleeve surface of the ferrule is provided with an elastic deformation groove. When the nut is connected with the joint, the inner cone hole of the nut is pressed against the outer cone surface of the ferrule, and the elastic deformation groove forms a gap, and the horn groove is sealed. The ferrule at the gap is convex outward by the squeezing thrust, and elastic deformation occurs. The elastic energy accumulated by the elastic deformation will effectively absorb the vibration of the connecting pipe, improve the vibration resistance of the seal, and cause heat rise and contraction caused by temperature changes. It acts as a seal compensation, especially when the joints, ferrules, nuts and connecting pipes are used for the connection of different materials and metals, the compensation effect is greater, and the reliability of the seal is ensured. The design shape of the elastic deformation groove may be a triangle shape, an inner arc shape, or other shapes. When the connection seal is satisfied, a ferrule cone is formed on the outer side of the ferrule at the joint of the cone hole horn and the ferrule sleeve wall in the ferrule. The gap between the kneading surface and the inner cone hole of the nut can be used. The groove has a maximum depth of 0.2 to 0.6 mm and a width of 2 to 4 mm.
连接管扩喇叭口时， 喇叭口与连接管结合处受力变形硬化最少， 较其他喇叭口位置难以出现变形缺陷,因此,将卡 套内锥孔喇叭槽锥斜角设计为大于接头夕卜锥台锥斜角,喇叭槽密封时，密封压力就会集中在喇叭口与连接管结合处， 密封 面面宽变窄， 密封性更好。 与此同时， 密封压力集中在喇叭口与连接管结合处， 对应的卡套外锥钭面上的弹性变形槽 获得的弹性能量更大， 密封的抗振性， 密封补偿能力更强。 实施时建议卡套内锥孔喇叭槽锥斜角大于接头外锥台锥斜角 1到 15度。  When the connecting pipe expands the bell mouth, the joint of the bell mouth and the connecting pipe is subjected to the least deformation and hardening, and the deformation defect is hard to occur compared with other bell mouth positions. Therefore, the bevel angle of the inner cone hole of the ferrule is designed to be larger than the joint. When the bevel cone is beveled, when the bell groove is sealed, the sealing pressure will be concentrated at the joint of the bell mouth and the connecting pipe, and the sealing surface width is narrowed and the sealing property is better. At the same time, the sealing pressure is concentrated on the joint of the bell mouth and the connecting pipe, and the elastic deformation groove on the outer taper surface of the corresponding ferrule obtains greater elastic energy, the vibration resistance of the seal, and the sealing compensation ability is stronger. During implementation, it is recommended that the taper angle of the inner cone hole of the ferrule is larger than the taper angle of the outer cone of the joint by 1 to 15 degrees.
本发明的喇叭槽密封， 因连接管喇叭口被挤压面定在接头外锥台与卡套内锥孔喇叭槽之间， 连接管才不会出现 拉拔松动， 松脱的现象， 接头外锥台对连接管喇叭口的挤压力通过卡套内锥孔喇叭槽传递到弹性变形槽,使卡套产生弹 性变形， 从而带来吸震， 密封补偿等功能， 卡套密封时， 连接管径向被挤压收缩， 连接管有被压扁产生泄漏的可能， 特别是在连接低硬度薄壁金属连接管时， 连接管刚性较低， 连接管更易径向压縮变形， 但喇叭口被挤压固定后， 喇叭口 与卡套密封位置较近， 对卡套密封处的连接管管壁起到一定的支撑作用， 消除了连接管有被压扁产生泄漏的可能， 达到 本发明可应用在低硬度薄壁金属管上的目的。 因此， 喇叭槽密封不仅起到密封作用,还起到面持连接管,弹性变形卡套，支 撑连接管管壁的作用。  The horn groove seal of the present invention is arranged between the outer frustum of the joint and the horn of the taper hole of the ferrule due to the pressed surface of the bell mouth of the connecting pipe, and the connecting pipe is not loosened or loosened. The pressing force of the outer frustum of the joint to the bell mouth of the connecting pipe is transmitted to the elastic deformation groove through the inner cone hole of the ferrule, so that the ferrule is elastically deformed, thereby bringing shock absorption, sealing compensation and the like, and when the ferrule is sealed, The connecting pipe is squeezed and contracted radially, and the connecting pipe has the possibility of being flattened to cause leakage, especially when connecting the low-hardness thin-walled metal connecting pipe, the connecting pipe is less rigid, and the connecting pipe is more easily radially compressed and deformed, but the horn After the mouth is squeezed and fixed, the bell mouth and the ferrule sealing position are relatively close, and the connecting pipe wall of the ferrule sealing portion plays a certain supporting role, thereby eliminating the possibility that the connecting pipe is crushed and leaking, and the invention is achieved. Can be applied to low hardness thin-walled metal tubes. Therefore, the bell groove seal not only serves as a sealing function, but also functions as a joint holding pipe, an elastic deformation ferrule, and a support pipe wall.
将螺母内锥孔长度设计为大于等于卡套长度， 在卡套锥钭角略小于螺母内锥孔锥钭角时， 卡套就会被完全挤压 在螺母内锥孔中， 卡套才能被充分挤压密封， 本发明的密封才能获得最佳的密封性能。 螺母内锥孔长度和卡套长度均大 于 4mm， 才能确保螺母内锥孔挤压卡套外锥钭面时卡套密封的密封面长度达到密封要求。  The length of the inner taper hole of the nut is designed to be greater than or equal to the length of the ferrule, and when the ferrule angle of the ferrule is slightly smaller than the taper angle of the inner cone of the nut, the ferrule is completely squeezed in the inner cone of the nut, the card The sleeve can be sufficiently squeezed to seal, and the seal of the present invention achieves the best sealing performance. Cone nut and ferrule length greater than the length of 4m m, in order to ensure the sealing of the ferrule to seal the sealing surface length requirements cone nut pressing the ferrule outer tapered surface Dou.
本发明的卡套被完全挤压在螺母内锥孔中， 被锥面密封,喇叭槽密封， 卡套密封包围的结构特点决定了卡套可以 为软态。 卡套为软态是指卡套加工成形后的热处理状态。 将金属卡套设计成软态， 在与低硬度薄壁金属管路连接时， 卡 套受到挤压时更易压縮变形， 便得各密封面易获得可靠的密封。 与此同时,对卡套精度， 螺母精度,连接管精度， 喇叭口 工艺要求降低， 生产成本下降， 连接工艺要求变得便捷。  The ferrule of the present invention is completely squeezed into the inner cone of the nut, sealed by the cone surface, sealed by the horn groove, and the structural characteristics surrounded by the ferrule seal determine that the ferrule can be in a soft state. The soft state of the ferrule refers to the heat treatment state after the ferrule is formed and formed. The metal ferrule is designed to be soft. When it is connected with a low-hardness thin-walled metal pipe, the ferrule is more easily compressed and deformed when squeezed, so that each sealing surface is easy to obtain a reliable seal. At the same time, the accuracy of the ferrule, the accuracy of the nut, the accuracy of the connecting pipe, the technical requirements of the bell mouth are reduced, the production cost is lowered, and the connection process requirements are facilitated.
 密封技术要求喇叭口中心线与接头外锥台中心线尽可能重合， 否则容易引起泄漏， 特别是在大口径连接管的 连接密封上， 对中心线重合的要求更高。 本发明中的卡套密封， 卡套将连接管密封的同时， 对连接管中心线与接头中心 线起到调整纠偏的作用， 从而达到对喇叭口中心线与接头外锥台中心线的调整纠偏， 因此， 本发明中的卡套密封还起到 调整纠偏喇叭口中心线与接头外锥台中心线的作用， 确保喇叭槽密封的密封性能。  The sealing technology requires that the center line of the bell mouth and the center line of the outer frustum of the joint overlap as much as possible, otherwise leakage is likely to occur, especially on the connection and sealing of the large-diameter connecting tube, and the requirement for center line coincidence is higher. In the ferrule sealing of the invention, the ferrule seals the connecting pipe and adjusts and corrects the center line of the connecting pipe and the center line of the joint, thereby achieving the adjustment and correction of the center line of the bell mouth and the center line of the outer frustum of the joint. Therefore, the ferrule seal of the present invention also functions to adjust the center line of the correction horn and the center line of the outer frustum of the joint to ensure the sealing performance of the horn groove seal.
[0021 ]喇叭槽密封时， 喇叭口与连接管结合处卡套一侧的卡套内锥孔喇叭槽是完全严密地挤压贴合着喇叭口的， 此时 卡套起到一个衬托保护作用， 提高了喇叭口与连接管结合处承压能力。 卡套密封时， 螺母内锥孔， 卡套， 连接管三者之
间的间隙被挤压变形的卡套锥斜角封闭， 隔绝了喇叭口与连接管结合处与外界的相通， 电化学腐蚀发生的必要条件是要 处于湿空气， 水之中， 隔绝了喇叭口与连接管结合处与外界的相通， 电化学腐蚀的发生失去必要条件， 也就彻底消除了 接头与异种金属连接管连接时产生电化学腐蚀的问题。  When the bell groove is sealed, the inner cone hole of the ferrule on the side of the ferrule at the joint of the bell mouth and the connecting tube is completely tightly pressed and attached to the bell mouth, and the ferrule serves as a lining protection function. , improve the pressure bearing capacity of the joint between the bell mouth and the connecting pipe. When the ferrule is sealed, the inner cone hole of the nut, the ferrule, and the connecting tube are three The gap between the gaps is closed by the slanted and deformed ferrule cone angle, which isolates the connection between the bell mouth and the connecting pipe and the outside. The necessary condition for electrochemical corrosion is to be in the humid air, the water, and the bell mouth is isolated. The connection with the connecting pipe and the outside world, the occurrence of electrochemical corrosion loses the necessary conditions, which completely eliminates the problem of electrochemical corrosion when the joint is connected with the dissimilar metal connecting pipe.
螺母设有内锥孔， 即卡套密封， 是专门设计在螺母上的， 密封时无需对现有接头外锥台作结构上的改变， 从而 达到不改变现有接头结构的前提下， 实施本发明的目的， 使得本发明的连接螺母与现有技术的连接螺母具有了完全的互 换性。  The nut is provided with an inner cone hole, that is, a ferrule seal, which is specially designed on the nut, and does not need to make structural changes to the outer joint frustum of the existing joint when sealing, so as to achieve the condition that the existing joint structure is not changed. The object of the present invention is to make the coupling nut of the present invention completely interchangeable with the prior art coupling nut.
现有技术中的接头外锥台锥斜角小于 90度， 如果大于 90度， 接头就成了具有内锥孔的接头了， 此时， 仅需在接 头内锥孔上套接一个两头为外锥台的过渡接头， 就可将内锥孔接头过渡到具有外锥台的接头上来实施本发明。 本发明的 螺母可制作成外六角形， 便于工具施加力矩连接安装。  In the prior art, the outer taper taper angle of the joint is less than 90 degrees. If it is greater than 90 degrees, the joint becomes a joint with an inner taper hole. At this time, only one taper is required on the inner taper hole of the joint. The two ends are transition joints of the outer frustum, and the inner tapered bore joint can be transferred to the joint having the outer frustum to carry out the invention. The nut of the present invention can be made into an outer hexagon shape for the tool to be attached by a torque connection.
本发明可在接头与螺母螺紋连接处， 各密封面间， 施涂金属厌氧胶。 施涂金属厌氧胶， 不但可以起到修补密封 面的缺陷， 润滑螺紋连接及密封面，减小装配力矩,提供更高的连接密封性能， 连接后， 还可提供高拆卸力矩， 具有了更 可靠的防连接松动能力， 施涂金属厌氧胶， 增加的拆卸力矩是单纯的螺母与接头螺紋连接的数倍以上， 正常情况下不可 拆卸， 从而为应用在要求不可拆卸的连接管连接场合成为可能。 本发明又可在接头与螺母， 螺母与连接管的连接部位套 上热縮套管， 有利于密封性能的长期稳定性， 本发明中的螺母， 接头， 连接管， 卡套采用不锈钢， 合金钢， 铜合金， 铝 合金等金属材料制作。 螺母光壁孔与连接管的间隙也可通过金属厌氧胶密封来封堵与外界的相通， 同时， 金属厌氧胶也 会对螺母光壁孔提供拆卸力矩。  The present invention can apply a metal anaerobic adhesive between the sealing faces at the joint of the joint and the nut. The application of metal anaerobic adhesive not only repairs the sealing surface defects, but also lubricates the threaded connection and sealing surface, reduces assembly torque, provides higher joint sealing performance, and provides high disassembly torque after connection. Reliable anti-connection loosening ability, metal anaerobic adhesive is applied, the added disassembly torque is several times more than the simple nut-joint thread connection, and it can not be disassembled under normal conditions, thus becoming suitable for applications where non-removable connecting pipe connections are required. may. The invention can also put a heat shrinkable sleeve on the joint portion of the joint and the nut, the nut and the connecting tube, which is beneficial to the long-term stability of the sealing performance. The nut, the joint, the connecting tube and the ferrule of the invention are made of stainless steel, alloy steel. , copper alloy, aluminum alloy and other metal materials. The gap between the nut light wall hole and the connecting pipe can also be blocked by the metal anaerobic rubber seal to block the connection with the outside. At the same time, the metal anaerobic glue also provides the disassembly torque to the nut light wall hole.
本发明中的流体包括液体和气体， 本发明可用于所有输送液体或气体的管路连接上， 包括石油,化工， 治金， 制 药， 仪器仪表， 电力， 空调， 机械， 电子， 航空， 船舶， 汽车制造， 液压传动等工业制造中所有管与管， 管与阀及管与 其他设备接口处的管路连接。  The fluid in the present invention includes liquid and gas, and the present invention can be applied to all pipelines for conveying liquid or gas, including petroleum, chemical, metallurgy, pharmaceutical, instrumentation, electric power, air conditioning, mechanical, electronic, aviation. , in ships, automotive manufacturing, hydraulic transmission and other industrial manufacturing, all pipes and tubes, pipes and valves and pipes are connected to other equipment at the interface.
 由于采用了上述技术方案， 本发明具有如下主要特点：  Since the above technical solution is adopted, the present invention has the following main features:
1 ,本发明保持了与扩喇叭口连接的连接工艺要求相同,连接成本较低， 连接方法便捷， 可用于低硬度薄壁金属管路的优点 的同时， 实现承压超过 20MPa以上的密封连接， 密封性能获得数倍提高。 1. The invention maintains the same connection process requirement as the connection of the flared port, the connection cost is low, the connection method is convenient, and the utility model can be used for the advantages of the low-hardness thin-wall metal pipe, and at the same time, the sealing connection with the pressure exceeding 20 MPa or more is realized. The sealing performance is increased several times.
 2,本发明为多重密封， 可在喇叭槽密封失效的情况下， 仍能保持理想的密封效果。 因而,本发明可在连接管件螺 紋抗拉强度范围， 实施最大力矩的螺旋连接， 使得连接不必顾忌过拧紧造成压裂喇叭口的问题， 拧不紧的问题也就自然 不存在， 连接安装变得更简捷， 更可靠。  2. The present invention is a multiple seal that maintains a desired sealing effect in the event of a failure of the horn seal. Therefore, the present invention can realize the screw connection of the maximum torque in the range of the tensile strength of the connecting pipe thread, so that the connection does not have to be overly tightened to cause the problem of the fracturing bell mouth, and the problem of the screwing does not exist naturally, and the connection installation becomes Simpler and more reliable.
 3,本发明连接密封部分与外界彻底隔离， 可应用在连接管与接头为异种金属的连接上而无电化学腐蚀， 从而为 低成本连接管取代高成本连接管的应用成为可能。  3. The connecting sealing portion of the present invention is completely isolated from the outside, and can be applied to the connection of the connecting pipe and the joint to a dissimilar metal without electrochemical corrosion, thereby making it possible to replace the high cost connecting pipe with a low cost connecting pipe.
 4,本发明为围绕卡套的多重密封连接， 且卡套为软态， 有利于挤压密封面的密封， 因而对连接管件， 卡套， 扩 喇叭口精度要求较低， 连接时更为简便， 连接成本下降。 连接抗振防松动性能更优。  4. The invention is a multiple sealed connection around the ferrule, and the ferrule is in a soft state, which is favorable for sealing the sealing surface, so that the precision of the connecting pipe fitting, the ferrule and the flared opening is low, and when connecting It's easier and the connection costs are lower. The connection is more resistant to vibration and loosening.
 5, 本发明与现有连接螺母有着完全的互换性， 可在不改变现有接头结构， 不改变现有扩喇叭口连接工艺的前提 下， 取代现有连接螺母。  5. The present invention has complete interchangeability with the existing connecting nut, and can replace the existing connecting nut without changing the existing joint structure and without changing the existing flare connecting process.
说明书附图 1是本发明的连接结构示意图。 BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic view of a connection structure of the present invention.
说明书附图 2是本发明的螺母结构示意图。 2 is a schematic view of the nut structure of the present invention.
说明书附图 3是本发明的卡套结构示意图。 BRIEF DESCRIPTION OF THE DRAWINGS FIG. 3 is a schematic view showing the structure of a ferrule of the present invention.
具体实施方式 detailed description
下面结合附图和实施例对本发明作进一步说明：  The present invention will be further described below in conjunction with the accompanying drawings and embodiments:
附图中 1为接头， 2为螺紋连接， 3为螺母， 4为接头外锥台底径， 5为接头外锥台 ,6为锥面密封， 7为连接管喇叭口 , 8为卡套， 9为连接管， 10为螺母内锥孔， 1 1为螺母内锥孔锥斜角， 12为螺母光壁孔， 13密封锥面， 14卡套内圆柱 孔， 15卡套内锥孔喇叭槽， 16为卡套弹性变形槽， 17为卡套外锥钭面， 18为卡套锥斜角， 19为卡套套孔壁。 1 is a joint, 2 is a threaded connection, 3 is a nut, 4 is the outer diameter of the outer frustum of the joint, 5 is the outer frustum of the joint, 6 is a cone seal, 7 is a bell mouth of the joint, 8 is a ferrule, 9 is the connecting pipe, 10 is the inner cone hole of the nut, 1 1 is the taper angle of the inner taper of the nut, 12 is the light wall hole of the nut, 13 is the sealing cone face, 14 ferrule inner cylindrical hole, 15 ferrule inner cone hole speaker groove 16 is the elastic deformation groove of the ferrule, 17 is the outer cone surface of the ferrule, 18 is the slant angle of the ferrule, and 19 is the wall of the ferrule sleeve.
实施例： 图 1为本发明的连接结构示意图。 本发明连接管件包括螺母 3和卡套 8 , 连接时， 先将螺母 3, 卡套 8依 次套装在连接管 9上， 卡套锥斜角 18朝向螺母内锥孔锥钭角 1 1， 连接管 9管端扩连接管喇叭口 7， 轻拉连接管 9， 将卡套 8通过连接管喇叭口 7拉入螺母内锥孔 10内， 左右旋转螺母 3数次， 直到手感拉不动为止， 使得连接管喇叭口 7与卡套内 锥孔喇叭槽 15， 卡套套孔壁 19与连接管 9的外壁， 卡套外锥斜面 17与螺母内锥孔 10相互间尽可能地平滑贴合在一起 ， 然后将螺母 3通过螺紋连接 2与接头 1连接， 直到手感拧不动时， 通过工具对螺母 3施加力矩， 在手感力矩骤然加大时 继续螺旋二圈为止。 此时， 卡套锥斜角 18锥入螺母内锥孔 10与连接管 9之间实现卡套密封， 被挤压固定在接头外锥台 5和卡套内锥孔喇叭槽 15之间的连接管喇叭口 7实现喇叭槽密封， 卡套内圆柱孔 14上的密封锥面 13与接头外锥台 5实现 锥面密封 6, 连接完成。 接头外锥台底径 4为接头 1的外锥台底部最大直径， 当卡套内圆柱孔 14直径小于接头外锥台底径 4， 卡套内圆柱孔 14满足一定深度时， 卡套内圆柱孔 14的密封锥面 13就会与接头外锥台 5挤压， 实现锥面密封 6, 随着 锥面密封 6的不断挤压， 接头外锥台 5朝着卡套内锥孔喇叭槽 15方向推进， 抵触并挤压卡套内锥孔喇叭槽 15中的连接管
喇叭口 7， 实现喇叭槽密封， 卡套弹性变形槽 16受到来自喇叭槽密封的推力， 发生弹性变形， 与此同时， 随着螺母 3与 接头 1的螺紋连接 2的连续螺旋连接， 螺母内锥孔 10通过卡套 8不断增大对连接管 9的压缩挤压， 实现更稳固的卡套密封 Embodiments FIG. 1 is a schematic view of a connection structure of the present invention. The connecting pipe member of the invention comprises a nut 3 and a ferrule 8. When connecting, the nut 3 and the ferrule 8 are firstly set on the connecting pipe 9, and the ferrule angle 18 of the ferrule is oriented toward the inner cone of the nut. 9 pipe end expansion connecting pipe bell mouth 7, lightly pulling the connecting pipe 9, pulling the ferrule 8 through the connecting pipe bell mouth 7 into the inner cone hole 10 of the nut, rotating the nut 3 left and right several times until the hand feels not moving, so that The connecting tube bell mouth 7 and the inner sleeve hole speaker groove 15 of the ferrule, the outer wall of the sleeve hole wall 19 and the connecting tube 9, the outer sleeve inclined surface 17 of the sleeve and the inner tapered hole 10 of the nut are smoothly fitted to each other as much as possible. Then, the nut 3 is connected to the joint 1 through the screw connection 2, until the hand feels unscrewed, a torque is applied to the nut 3 by the tool, and the spiral is continued for two times when the hand feeling moment suddenly increases. At this time, the ferrule cone angle 18 is tapered between the inner cone hole 10 of the nut and the connecting tube 9 to realize the ferrule sealing, and is pressed and fixed between the outer frustum 5 of the joint and the inner horn of the ferrule. The bell mouth 7 realizes the bell groove sealing, and the sealing cone surface 13 on the cylindrical hole 14 of the ferrule and the outer frustum 5 of the joint realize the taper sealing 6, and the connection is completed. The outer diameter of the outer frustum of the joint is the maximum diameter of the bottom of the outer frustum of the joint 1. When the diameter of the inner cylindrical hole 14 of the ferrule is smaller than the bottom diameter of the outer frustum of the joint, and the inner cylindrical hole 14 of the ferrule meets a certain depth, the inner cylinder of the ferrule The sealing cone 13 of the hole 14 is pressed against the outer frustum 5 of the joint to realize the taper seal 6. As the tapered seal 6 is continuously squeezed, the outer frustum 5 of the joint faces the inner cone of the ferrule 15 Advancing direction, resisting and squeezing the connecting pipe in the inner ring cone speaker groove 15 of the ferrule The bell mouth 7 realizes the bell groove sealing, and the elastic deformation groove 16 of the ferrule is elastically deformed by the thrust from the horn groove seal, and at the same time, with the continuous spiral connection of the nut 3 and the threaded connection 2 of the joint 1, the nut inner cone The hole 10 continuously increases the compression and compression of the connecting pipe 9 through the ferrule 8 to achieve a more stable ferrule seal