WO2014180179A1

WO2014180179A1 - Connecting pipe fitting for pipeline

Info

Publication number: WO2014180179A1
Application number: PCT/CN2014/072064
Authority: WO
Inventors: 孙海潮
Original assignee: Sun Haichao
Priority date: 2013-05-05
Filing date: 2014-02-13
Publication date: 2014-11-13
Also published as: CN103604013B; CN103604013A

Abstract

Disclosed is a connecting pipe fitting for a pipeline, comprising a nut (3), a connector outer frustum (5) and a connecting pipe bell mouth (7), wherein the nut has an inner tapered bore (6), a tapered sleeve (9) is provided in the nut inner tapered bore (6), the tapered sleeve (9) is a hollow tapered sleeve sheathing hole, a bottom part of the tapered sleeve sheathing hole is provided with a tapered sleeve inner tapered bore (18), a flared groove (24) is provided on the tapered sleeve inner tapered bore (18), a tapered sleeve sheathing hole wall (20) together with a tapered sleeve outer tapering oblique face forms a tapered sleeve tapering oblique angle (21), the connector outer frustum (5) squeezes the bell mouth (7) and squeezes the tapered sleeve inner tapered bore (18), and the tapered sleeve tapering oblique angle (21) was squeezed between the nut inner tapered bore (6) and a connecting pipe (10), sealing the connecting pipe (10) and forming a metallic hard seal between the connector outer frustum (5) and the tapered sleeve inner tapered bore (18), and the connecting pipe bell mouth (7) is squeezed between the connector outer frustum (5) and the flared groove (24), sealing the flared groove. The connecting pipe fitting for a pipeline has the advantages of fast and convenient sealed connection, low requirements in terms of sealing techniques, high sealing performance, being applicable to the connection of pipelines of various materials, and being completely interchangeable with existing connecting nuts.

Description

Pipe connection pipe fitting

Technical field

[0001] The present invention is in the field of mechanical manufacturing, and relates only to a connecting pipe member for connecting pipes into pipes, and more particularly to a connecting pipe member of a fluid transfer pipe.

Background technique

Connections between pipes and pipes, pipes and other pipe connections, such as welded joints, threaded joints, flanged joints, flared joints, and ferrule joints. The flared port connection, also known as the flared connection, the flanged connection, has the advantages of connection process requirements, low connection cost, convenient connection method, low sealing pressure, poor sealing reliability, and can usually only be used in sealing. Pipe connections with a pressure below 8 MPa. Flared flare fittings typically include a nut, a fitting with an outer frustum, and sometimes a bushing. The sealing principle of the flared port connection is to fit the connecting pipe port into the nut, and then expand the port into a bell mouth. The internal thread on the nut is screwed to the external thread on the joint, and the connecting pipe bell mouth is squeezed by the inner cone hole of the nut. Pressing on the outer frustum of the joint forms a sealed connection. When the connection is sealed, the connecting tube bell mouth is connected, and the connecting tube bell mouth is clamped between the inner cone hole of the nut and the outer frustum of the connecting piece, and the inner cone hole of the nut has no direct contact with the outer frustum of the joint, which is a flared speaker. Technical characteristics of the mouth connection. The disadvantage of the flared port connection is that the flared end is easily cracked, the flared surface is rough and the pressure bearing capacity is weak, and the main sealing sealing portion of the bell mouth and the connecting portion of the connecting portion of the bell joint will produce concentrated stress. When subjected to corrosion and fatigue vibration, the part is most prone to looseness, cracking and leakage. The prior art also has a design that uses a bushing to protect the bell mouth. The bushing is only used in the squeeze seal to the bell mouth. The protection function is that the bushing and the connecting pipe are loosely sleeved, there is a gap, no mutual pressing effect, no sealing performance. When the flared port is connected, the connecting pipe should be put in the nut and the bushing first. The connecting pipe and the nut and the bushing are loosely matched, there is a gap, and the outside is in communication with the outside atmosphere, water and gas, 7j pairs The erosion of the flared opening of the bell mouth always exists. For a long time, when the erosion reaches a certain level, the flared opening of the bell mouth will leak due to corrosion, and the joint will be leaked, especially when the joint material and the connecting pipe material are dissimilar metals. There is an electrochemical corrosion damage, especially the corrosion destructiveness. For example, in the flare connection of the tantalum joint and the aluminum connecting tube, the copper joint is directly in contact with the bell mouth of the aluminum connecting tube, and the electrochemical corrosion between the copper and aluminum After the connection, it always exists. The flared opening of the bell is most likely to cause cracking and leakage due to electrochemical corrosion. Therefore, the flare connection is not directly applicable to the connection of the copper joint and the aluminum connecting tube. In addition, the pipe is often in a certain vibration state when the pipe is connected, and the pipe itself may be shaken loose due to the interference of the external environment. Since there is a gap between the pipe itself and the nut sleeve hole after the connection, the sleeve hole of the connecting pipe is usually sleeved in the nut. The hole length is only about 4mm, and the inner cone hole at the bottom of the nut is connected with the sleeve hole. Therefore, the gap is short and communicates with the bellows of the connecting tube. Any vibration or wobble caused by the connecting tube will be transmitted almost without attenuation. To the flared opening of the bell mouth, these will aggravate the fatigue stress of the flared opening of the bell mouth. When the vibration fatigue caused by various vibrations and vibrations accumulates to a certain extent, it will loosen the connection and reduce the sealing performance until the crack is broken and the sealing is completely lost. The flared port connection only creates a seal at the bell mouth. It is a single-sealed connection. Once the bell mouth seal leaks, it means that the connecting pipe has lost its sealing performance. Therefore, it is a long-awaited search for a connecting seal with higher pressure, more reliable sealing performance, superior corrosion resistance, anti-vibration and anti-loose performance, and can be directly used for connecting pipes between dissimilar metals without electrochemical corrosion. The technical problem solved.

Summary of the invention

[0003] The object of the present invention is to solve the problem of the above-mentioned flared port connection. On the basis of the flared port connection, the pipe connecting pipe fittings are specially provided without changing the structure of the existing connecting joint. The invention solves the problems of the above-mentioned flared port connection method: the connection sealing pressure is low, the sealing performance is poor, the corrosion resistance is not corrosion-proof, the anti-vibration and the anti-loose property are low, and the problem of the pipeline connection between dissimilar metals cannot be directly used.

The object of the invention is achieved in the following ways:

The utility model relates to a pipe connecting pipe fitting, which comprises a nut, a joint, an outer frustum and a connecting pipe bell mouth on the joint, wherein: the nut is a nut having an inner taper hole, and the tapered taper sleeve is arranged in the inner taper hole of the nut The taper sleeve is a hollow taper sleeve hole, and the taper sleeve hole bottom is provided with a taper sleeve inner taper hole, the taper sleeve sleeve hole wall and the taper sleeve outer cone slope surface form a cone sleeve cone angle, and the joint outer cone table is squeezed to connect the tube bell mouth, The inner cone hole of the taper sleeve is pressed by the bell mouth of the connecting pipe, and the taper angle of the taper sleeve is squeezed between the taper hole of the nut and the connecting pipe to realize the sealing pipe joint between the taper sleeve hole and the connecting pipe, and the bell mouth of the connecting pipe is squeezed The bell mouth seal is realized between the outer frustum of the joint and the inner taper hole of the taper sleeve, and the direction of the taper angle of the cone sleeve is opposite to the direction of the nut screwing.

The invention can also be implemented in such a way that:

1 . A pipeline connecting pipe member, comprising a nut, a joint, an outer frustum on the joint and a connecting pipe bell mouth, wherein: the nut is a nut having an inner taper hole, and the inner taper hole of the nut is provided with an auxiliary device. The taper sleeve is a hollow taper sleeve hole, and the taper sleeve hole bottom is provided with a taper sleeve inner taper hole, the taper sleeve inner cone hole is provided with a speaker slot, the taper sleeve hole wall and the taper sleeve outer cone slope face form a cone sleeve cone oblique Angle, the outer frustum of the joint squeezes the bell mouth of the connecting pipe and the inner taper hole of the pressing taper sleeve, and squeezes the taper angle of the taper sleeve between the taper hole of the nut and the connecting pipe to realize the sealing pipe seal of the taper sleeve hole and the connecting pipe And the metal hard seal between the outer frustum of the joint and the inner taper hole of the taper sleeve, the bell mouth of the connecting pipe is squeezed between the outer frustum of the joint and the speaker groove on the inner taper hole of the taper sleeve to realize the bell groove seal, the cone sleeve cone The direction of the oblique extrusion is opposite to the direction in which the nut is screwed.

[0006] 2, the cone angle inside the taper sleeve cone is equal to the taper angle of the outer cone cone of the joint or the taper angle of the cone cone inside the taper sleeve is smaller than the taper angle of the outer cone cone of the joint by 0 to 15 degrees.

[0007] 3, the outer diameter of the outer frustum of the joint is less than or equal to the bottom diameter of the taper sleeve, the bottom diameter of the taper sleeve is less than or equal to the bottom diameter of the inner taper hole of the nut, the height of the taper sleeve is less than or equal to the height of the inner cone of the nut, and the taper angle of the taper sleeve is less than or equal to the nut. Inner cone hole cone angle.

[0008] 4, the inner cone angle of the nut is less than 12 degrees.

[0009] 5, the height of the taper sleeve hole and the height of the taper hole in the nut are both greater than 3 mm, and the height of the taper sleeve is greater than 2 mm.

[0010] The fluid in the present invention includes a liquid and a gas, and the tubular member refers to a member that connects the tubes into a pipeline. The joint outer frustum extrusion connecting pipe bell mouth of the invention The taper hole of the taper sleeve is pressed by the bell mouth of the connecting pipe, and the taper angle of the taper sleeve is squeezed between the taper hole of the nut and the connecting pipe to realize the sealing of the taper sleeve hole and the connecting pipe. The tube bell mouth is squeezed between the outer frustum of the joint and the inner taper hole of the taper sleeve to realize the bell mouth seal for short as the bell mouth seal, the outer frustum of the joint squeezes the bell mouth of the connecting pipe and the inner taper hole of the extrusion taper sleeve and the cone The taper oblique angle is squeezed between the taper hole of the nut and the connecting pipe to realize the connecting pipe seal of the taper sleeve hole and the connecting pipe, and the metal hard seal between the outer frustum of the joint and the inner taper hole of the taper sleeve is simply referred to as double sealing of the connecting pipe The connecting tube bell mouth is squeezed between the outer frustum of the joint and the speaker groove on the inner taper hole of the taper sleeve to realize the speaker groove sealing is simply referred to as a bell groove seal. The connecting pipe seal of the invention, the double sealing of the connecting pipe, the sealing of the bell mouth, and the structural design of the bell groove sealing are a multiple sealing structure which are mutually connected, mutually acting, and mutually causal. Cone sleeve hole wall and cone sleeve outer cone slope surface Cone sleeve cone angle refers to the angle between the projection line of the cone sleeve hole wall and the cone sleeve outer cone slope projection line. Therefore, the cone sleeve cone angle is also the cone sleeve outer cone The taper angle of the bevel, in the implementation, the taper angle of the taper is the taper angle formed by the taper angle of the taper sleeve used to seal the inner taper hole of the nut and the connecting pipe. The taper angle of the present invention is the corresponding angle of the tapered hole, the frustum, the taper sleeve, the bell mouth, the center line of the horn groove and the projection line of the cone inclined surface, and therefore, the hole of the cone sleeve and the outer cone of the cone sleeve The taper angle of the taper sleeve is also the angle between the center line of the taper sleeve hole and the outer cone slope of the taper sleeve. If there is no taper sleeve hole, there is no taper angle of the taper sleeve on the taper sleeve, and no taper cone angle is squeezed. The connecting tube between the taper hole and the connecting tube is sealed, so that the taper sleeve hole and the taper taper angle are necessary technical features for realizing the present invention. When the connecting pipe is sealed, the taper angle of the taper sleeve is displaced in the opposite direction to the threaded connection of the nut, and the taper angle of the taper sleeve is squeezed between the taper hole of the nut and the connecting pipe to achieve a certain sealing pressure. When the taper angle of the taper sleeve is subjected to great resistance and cannot be displaced, the reaction force of the taper hole of the taper sleeve connected to the taper angle of the taper sleeve will suddenly increase, and the taper sleeve is reversely passed through the taper hole inside the taper sleeve. Squeeze and squeeze the bell mouth to achieve the bell mouth seal. Therefore, the bottom of the taper sleeve hole is provided with a structural design of the inner taper hole of the taper sleeve, and the connecting tube is sealed by integrally connecting the taper sleeve hole with the inner taper hole of the taper sleeve, the connecting tube is double sealed, the bell mouth is sealed, and the horn is sealed. The groove seals are connected to each other, interacting with each other, and causing multiple causal multiple seals. The original flared port connection, improper torque, excessively large, too strong, the bell mouth making process, the material quality of the bell mouth, the wall thickness and other factors may cause the squeezing bell mouth to rupture and not seal, but the invention Multi-seal structure design, when the torque is improperly applied, too large, too strong, causing the bell mouth to rupture, the seal is of course a failure for the bell mouth seal, but the torque that causes the bell mouth seal failure will further improve the connection. The tube is sealed and the double seal of the connecting tube ensures that the sealing performance can still achieve a higher sealing capacity when the bell seal fails. The height of the taper sleeve designed by the invention can be arbitrarily lengthened along the center line direction without being restricted by the structure, so that the taper sleeve hole and the connecting tube, the outer tapered cone of the taper sleeve and the squeeze sealing surface of the inner cone hole of the nut can be enlarged, All the seals of the invention are surface extrusion, the extrusion sealing surface is enlarged, and the excessive torque which causes the bell mouth to fail to seal, the sealing of the connecting pipe and the double sealing of the connecting pipe are advantageous, which further improves the sealing of the connecting pipe. The sealing performance is achieved until the target sealing pressure is reached, achieving the object of the invention. The expansion flare connection is difficult to control the magnitude of the applied torque. Insufficient tightening and over-tightening often occur. If the tightening force is insufficient, the seal will not be achieved. If the tightening is too tight, the bell mouth will be crushed and leaked. The extrusion is dominant, and the pressing surface is mostly pressure-bearing, so the torque can be applied without any fear until the desired seal is achieved. The moving direction of the taper angle taper seal is opposite to the direction in which the nut is screwed. It means that the nut and the joint thread are screwed into the joint direction, and the taper angle of the taper sleeve moves in the opposite direction to the nut moving direction. This embodies the technical feature that the taper angle of the taper sleeve of the present invention is a pressing movement in the inner taper hole of the nut relative to the inner taper hole of the nut to generate a sealing pressure, thereby compressing and deforming the connecting tube to produce a joint tube seal. The shape of the taper sleeve hole should be the same as the shape of the connecting tube. Usually, the connecting tube is a round tube. Therefore, the taper sleeve hole is a straight cylindrical inner hole, and the taper sleeve hole diameter is only slightly larger than the outer diameter of the connecting tube to meet a good seal. need. The taper sleeve used in the inner cone hole of the nut is used together. It refers to the hole bottom diameter of the taper hole in the nut, the taper angle, the hole height, and the end diameter and the corresponding position of the taper sleeve are matched to design, so that the connecting pipe is sealed. When the ideal sealing performance is obtained, the matching use also shows that both the inner cone hole and the tapered sleeve of the nut play each other in the purpose of achieving the object of the present invention, and are indispensable.

[001 1]The bell mouth opening and closing port is the part where the flared port is most prone to rupture and leaks. The original flared port is connected. When the nut and the outer frustum of the joint are pressed against the bell mouth, the connecting pipe is sleeved at In the nut, in the bushing, between the connecting pipe and the nut, there must be a clearance between the bushings. The bellows opening and closing is located in the gap. When the outer frustum of the joint squeezes the bell mouth, the bell mouth is opened. The mouth is subjected to the largest pressing force, and the other side of the bell mouth is a non-supporting gap. Therefore, the torque is difficult to control when the nut is connected, and the tightening force is insufficient to achieve the sealing purpose. The danger of fracturing the bell mouth to open the bend. Even if it is not broken for a while, the pressure-receiving performance of the flared opening of the bell mouth is greatly reduced due to the deformation of the flared joint, and the long-term erosion of the flared opening of the bell mouth with the dirty air passing through the gap. When the connecting pipe is vibrating during operation, the flared opening of the bell mouth becomes the most vulnerable to loosening and rupture. However, since the connecting pipe bell mouth is pressed between the outer frustum of the joint and the inner taper hole of the taper sleeve, when the connecting pipe is sealed, the inner taper hole of the taper sleeve on the side of the bell mouth of the bell mouth is It is completely tightly pressed and attached to the bell mouth. At this time, the taper sleeve serves as a backing protection function, which improves the pressure bearing capacity of the flared opening of the bell mouth, and also because of the structure of the joint pipe seal, so that the nut and the connecting pipe are The gap between the sleeve holes is closed by the angle of the taper cone of the extrusion deformation, which isolates the connection between the bell mouth and the outside, completely eliminates the influence of external moisture, sewage, and vibration on the bellows. The necessary condition for the occurrence of chemical corrosion is to be in the humid air and water, and to isolate the connection between the flared opening of the bell mouth and the outside. The occurrence of electrochemical corrosion loses the necessary conditions, and the connection between the joint and the dissimilar metal connecting pipe is completely eliminated. It will cause problems of electrochemical corrosion. The prior art shows that when the nut spirally pushes the taper sleeve to press and seal, the taper sleeve is subjected to a lateral torque, and the lateral torque acts as a loose seal for the seal, and the lateral torque excessively causes the seal to be lax. Therefore, the lateral torque should be minimized. If there is no bell seal and bell groove seal, the connecting pipe without the bell mouth is directly squeezed by the outer frustum of the joint. When the connecting pipe is inserted into the taper sleeve, if it is connected The pipe end exposes a part of the taper sleeve, and the outer frustum of the joint pushes the connecting pipe. At this time, the connecting pipe and the taper sleeve are loose, and the connecting pipe is easily pushed and pulled away from the taper sleeve, and the pipe end of the connecting pipe is squeezed. When the pusher is flush with the bottom of the taper hole, the taper sleeve will be squeezed. At this time, the lateral torque of the taper sleeve when the nut thread is screwed in will be opposite to the taper hole of the taper sleeve. When the displacement is sealed, the seal is loosened due to the relative rotation of the lateral torque, that is, the edge is sealed and the side is loose, and the ideal seal cannot be achieved. However, the bell mouth and the connecting pipe are integrated into one, and the bell mouth seal and the bell groove seal are designed. The bell mouth is connected with the connecting pipe and the taper sleeve, and the three are synchronously moved in the same direction, and the connecting pipe cannot be separated from the bell mouth. The sliding sleeve is slid away from the taper sleeve. Since the invention is mainly based on a face extrusion seal, the bell mouth The relative rotation caused by the lateral torque obtained by the connecting tube and the taper sleeve can play the role of smoothing the smooth sealing surface, and is conducive to the surface extrusion sealing. When the cone of the taper sleeve is inclined, the connecting cone and the inner cone of the nut stop moving in opposite directions due to the large pressing friction force between them. At this time, only a little torque is applied to the nut, and the outer frustum of the joint is further connected to the bell mouth. The inner taper hole extrusion of the taper sleeve, the metal hard seal, the bell mouth seal, the speaker groove sealing performance will be suddenly improved, and the sealing reliability is stronger.

[0012] The nut is a nut with an inner cone hole, that is, a sealing space formed by the inner cone hole and the connecting tube of the nut, which is specially designed on the inner hole of the nut, and then is tapped by the taper cone of the design of the present invention. The structural design pressed in the sealed space ensures that the seal does not have any structural conflicts with the existing joint outer frustum, so that the object of the present invention can be achieved without changing the existing joint structure, so that the present invention The connecting nut is completely interchangeable with the prior art connecting nut. At the same time as the cone angle of the taper sleeve is squeezed in the sealing space formed by the cone hole and the connecting pipe in the nut, the purpose of completely separating the bell mouth opening and the outside from the outside is also achieved.

[0013] The taper angle of the cone taper in the taper sleeve is equal to the taper angle of the outer taper cone of the joint, so that the bell mouth can be tightly pressed and fixed between the outer frustum of the joint and the taper hole of the taper sleeve, thereby achieving the sealed connection. Plays a tight connection. The flared mouth of the connecting pipe is bent from the bell mouth to the bell mouth port, and the pipe wall is gradually thinner, and the taper angle of the taper hole taper is designed to be smaller than the taper angle of the outer frustum cone of the taper to 0 to 15 degrees. When connecting, the inner tapered hole of the taper sleeve and the outer frustum of the joint form a gradually narrowing space, corresponding to the gradually thinning bell mouth, and the sealing and the firm connection effect are better when connected. In practical application, according to the structural dimensions of the joint fitting part such as the outer frustum, the taper sleeve and the connecting pipe, the taper angle of the cone taper inside the taper sleeve is selected, and the taper angle of the cone taper inside the taper sleeve is designed to be smaller than the joint. The angle of the frustum cone is between 1 and 8 degrees. When the joint is screwed to the nut and the torque needs to be applied by the tool, a part of the outer frustum of the joint is in contact with or will be in contact with the inner cone of the taper sleeve. It will be contacted. It means that the shortest distance between the two is within 0.2mm. In this way, when connecting, a part of the outer frustum of the joint is tightly pressed on the inner taper hole of the taper sleeve to form a metal hard seal, and the sealing connection performance is further improved and guaranteed.

[0014] The inner taper hole of the taper sleeve is provided with a horn groove, and the bell mouth of the connecting pipe is placed in the horn groove on the inner taper hole of the taper sleeve, and the metal hard seal has higher sealing property and is more reliable. When connecting, the depth of the speaker slot should be close to the wall thickness of the connecting pipe. The length of the speaker slot should be close to the length of the bell mouth of the connecting pipe, so that the bell mouth is completely placed in the speaker slot. When implementing the present invention, it is recommended to take the length of the speaker slot 1 3mm, the length of the flared flare is determined by this, which can meet the requirements of the speaker groove seal. The height of the horn is reduced by the flaring, and the squeezing is easy to be deformed. In the practice of the present invention, it is recommended that the horn of the horn be designed to be placed in the horn of the horn. In the case of a sealed connection, the first is the horn groove seal, and then the simultaneous sealing of the connecting tube double seal and the horn seal ensures optimum performance for each seal. When connecting, the sealing flange between the outer frustum of the joint and the bell mouth and the inner taper of the taper sleeve can be adjusted to achieve a more ideal seal.

[0015] When the bottom diameter of the outer frustum of the joint is less than or equal to the bottom diameter of the taper sleeve, the bottom diameter of the taper sleeve is less than or equal to the bottom diameter of the inner taper hole of the nut, and the height of the taper sleeve is less than or equal to the height of the taper hole in the nut, and the taper angle of the taper sleeve is less than or equal to the inner diameter of the nut. When the cone cone is inclined, the outer frustum of the joint will be partially or completely squeezed into the inner cone of the nut, and the taper sleeve will be completely squeezed into the inner cone of the nut. The pressing force of the outer frustum of the joint will be used for all. The connection seal ensures a highly sealed connection of the present invention. The above is equal to less than the medium less than the value allowed within the range allowed by the processing conditions. The taper angle of the taper sleeve is preferably less than 0 to 2 degrees of the taper angle of the inner taper hole of the nut. The bottom diameter of the taper sleeve is less than or equal to the bottom diameter of the inner taper hole of the nut, and the taper sleeve can all be squeezed into the inner cone hole of the nut. Otherwise, when the diameter of the taper sleeve bottom is larger than the bottom diameter of the inner taper hole of the nut, a cone may appear. The sleeve is held by the inner cone hole of the nut and cannot be squeezed, so that the squeeze seal cannot be completely completed, and the sealing purpose and effect of the present invention are not obtained. The nut of the present invention can be made into an outer hexagon shape, which is convenient for the wrench to be applied with a torque connection.

[0016] The taper angle of the taper hole in the nut is less than 12 degrees, which determines that the nut can obtain a higher inner cone height when the nut is made to meet the strength, and the inner cone is higher. When the corresponding taper sleeve has a high taper taper angle, it means that the taper angle of the taper sleeve and the inner circumferential sealing surface of the nut and the connecting tube are larger, and the sealing performance obtained is stronger. In the prior art, the inner cone hole of the nut is limited by the nut structure and the bevel angle of the bell mouth, and it is impossible to make it large. The bell mouth of the connecting pipe can be made through the nut, and it needs to be returned to the nut after being manufactured. On the taper hole, the diameter of the flare end must be smaller than the diameter of the inner hole of the nut thread. The pressing surface of the bell seal of the squeeze seal connection is too small. Once the nut is inside the taper hole, the bell mouth, the extrusion surface of the outer frustum of the joint appears. Process, material problems, improper flare connection methods, excessive torque application, it is easy to cause the bell mouth squeeze seal failure. However, the taper angle of the taper hole of the nut is less than 12 degrees, so that the taper angle of the taper sleeve and the circumferential sealing surface of the taper hole of the connecting pipe and the nut obtain a larger area, and the taper angle can be adjusted by the small taper angle The high design of the taper hole is achieved by increasing the pressing force to achieve the required sealing requirements. The design of the taper angle of the inner taper hole of the nut is less than 12 degrees, and the inner wall thickness of the taper sleeve is thinner, and is easily deformed by extrusion, so as to be fully deformed and sealed in the space formed by the taper hole and the connecting pipe in the nut.

[0017] The height of the taper sleeve hole and the height of the taper hole in the nut are both greater than 3 mm, and the height of the taper sleeve is greater than 2 mm, in order to ensure that the taper angle of the taper sleeve and the joint tube are sealed to obtain a circumferential sealing surface sufficient to meet the sealing requirements, especially The taper sleeve has a high hole. If it is too short, it is very likely that the joint pipe seal will not meet the sealing requirements. In practical applications, the height of the taper sleeve is recommended to be greater than 6 mm.

[0018] The cone angle of the present invention is the angle between the center line of the corresponding tapered hole, the frustum, the taper sleeve, the bell mouth and the horn groove and the cone slope line thereof. When the invention is applied, the taper angle of the bell mouth and the taper angle of the taper hole in the taper sleeve should correspond to the taper angle of the outer frustum of the joint, thereby ensuring complete interchangeability of the present invention with the nut of the prior art. The invention is specially designed for the joint with the outer frustum. Generally, the taper angle of the outer frustum of the joint is between 0 and 90 degrees, and is greater than 90 degrees, and the outer frustum of the joint becomes the joint with the inner taper hole. At this time, it is only necessary to sleeve a transition joint having two outer flanges on the joint having the inner tapered hole, and to convert the joint having the inner tapered bore to the joint having the outer frustum, and the same can be implemented. invented.

[0019] The present invention can be provided with an inner circular boss at the tail of the tapered inner hole of the nut, and a ring groove can be formed by the oblique angle of the connecting tube and the taper sleeve cone, which can ensure the bevel angle of the inner cone and the taper cone of the nut in a certain process. Within the error, the cone angle of the cone sleeve is increased by a certain distance of the extrusion movement, so as to be tightly pressed into the inner cone hole and the connecting tube of the nut. The purpose of each is to further ensure the desired sealing effect. The invention can also provide a sealing ring between the outer ring of the joint and the outer frustum of the joint in the ring groove, and the sealing of the connecting line can further improve the sealing performance by pressing the sealing ring over the sealing ring. The invention can also apply metal anaerobic adhesive at the joint between the joint and the nut, the outer frustum of the joint, the bell mouth of the joint pipe, the taper sleeve and the inner taper hole of the nut. Applying metal anaerobic adhesive not only can repair the sealing surface defects, provide sealing performance, but also provide extremely high anti-disassembly torque, with more reliable anti-connection loosening ability, metal anaerobic adhesive, increased The anti-disassembly torque is several times more than the threaded connection of the nut to the joint. It is almost impossible to disassemble under normal conditions, which makes it possible to apply the connection of the connecting pipe that requires non-removability. The invention can also be provided with a heat shrinkable sleeve at the joint portion of the joint and the nut, the nut and the connecting tube, which can better isolate the joint bonding portion from the outside, and is beneficial for protecting the long-term stability of the sealing performance of the present invention. The nuts, joints and taper sleeves can be made of stainless steel, alloy steel, copper or aluminum.

[0020] The present invention is a bell seal, a joint pipe seal, a metal hard seal and a double seal of a double seal of the joint pipe, plus a seal ring, an auxiliary seal of the metal anaerobic glue, the set seal provides far more than the original expanded horn At the same time, the port is connected to the simple bell mouth sealing ability, and the anti-disassembly torque of the nut and the joint is increased. The length of the light wall hole of the nut is required to be connected and sealed in actual use, and can be long or short. The gap between the light wall hole of the nut and the connecting pipe is sealed by the metal anaerobic glue, and the metal anaerobic adhesive provides a strong anti-disassembly torque to the light wall hole of the nut, and the anti-disassembly torque provided can be passed. The length of the light-walled hole of the lengthening nut is increased to be large enough to meet the anti-disassembly requirements of some special sealing connections. At the same time, it can effectively reduce the vibration and shock absorption. It is recommended to implement the nut wall hole. The length is greater than 10mm.

Due to the adoption of the above technical solution, the present invention has the following main features:

1. The invention can achieve the same connection process requirement for maintaining the connection with the flared port, the connection cost is low, and the connection method is convenient, and the sealing connection with the pressure exceeding 25 MPa or more is realized.

[0021] 2, the present invention can be connected to the screw thread of the connecting pipe thread with the maximum torque of the screw connection, so that the connection does not have to worry about the problem of tightening, the problem of not tightening naturally does not exist, the connection installation becomes simple and reliable, The success rate of one-time connection is greatly improved.

[0022] 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 the dissimilar metal without electrochemical corrosion, thereby replacing the high-cost connecting pipe with the low-cost connecting pipe. may.

[0023] 4. The invention has multiple sealing connections, so the precision of the connecting pipe, the taper sleeve and the flared mouth is lower, the connection is simpler, and the connection cost is reduced. The multiple sealing and connecting sealing parts are isolated from the outside, so that the connection anti-vibration and anti-loose performance is greatly increased, and the connection reliability is greatly improved.

[0024] 5. The present invention is completely interchangeable with the existing connecting nut, and can replace the existing connecting nut without changing the existing joint structure.

DRAWINGS

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a connection diagram of the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 2 is a schematic view showing the structure of a coupling nut of the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 3 is a schematic view of a tapered sleeve structure of the present invention.

[0028] FIG. 4 is a schematic view showing the structure of a horn grooved sleeve on the inner tapered hole of the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 5 is a schematic diagram of a prior art flared port connection.

[0029] FIG. 6 is a schematic view showing a sealing connection of a bevel groove on the inner tapered hole of the present invention.

detailed description

[0030] The present invention will be further described below in conjunction with the accompanying drawings and embodiments:

Attachment 1 is the joint, 2 is the threaded connection, 3 is the connection nut, 4 is the outer diameter of the outer frustum of the joint, 5 is the outer frustum of the joint, 6 is the inner cone of the nut, 7 is the bell mouth of the joint, 8 is the flare of the bell Bend, 9 is the nut taper sleeve, 10 is the connecting pipe, 1 1 is the nut threaded hole, 12 is the nut inner taper hole bottom diameter, 13 is the nut inner taper cone taper angle, 14 is the nut inner taper hole height, 15 is The inner diameter of the taper hole in the nut, 16 is the hole of the nut wall, 17 is the diameter of the taper sleeve, 18 is the taper hole inside the taper sleeve, 19 is the taper sleeve height, 20 is the taper sleeve hole wall, and 21 is the cone sleeve cone angle. 22 is the height of the taper sleeve, 23 is the diameter of the taper sleeve, 24 is the bell groove on the inner taper hole of the taper sleeve, 25 is the inner cone hole of the nut, 26 is the nut sleeve hole gap, 27 is the metal hard seal, 28 is the joint The frustum and the bell mouth are sealed, 29 is the bell mouth and the bell groove on the inner taper hole of the taper sleeve, 30 is the nut inner cone hole and the taper sleeve cone oblique angle seal, 31 is the taper sleeve cone angle and the connecting pipe wall seal.

[0031] Embodiments FIG. 1 is a schematic view of a connection structure of the present invention. 1 is a joint, and FIG. 1 is a connecting nut of the present invention. The connecting pipe member of the present invention comprises a connecting nut 3 and a nut taper sleeve 9, and the connecting nut 3 and the taper sleeve 9 are firstly set on the connecting pipe 10, and the taper sleeve is The taper angle 21 faces the inner cone hole 6 of the nut, connects the tube end to expand the bell mouth 7, pulls the connecting tube 10 lightly, pulls the taper sleeve 9 through the bell mouth 7 into the inner cone hole 6 of the nut, and rotates the connecting nut 3 left and right several times Until the handle is pulled, the connecting tube bell mouth 7 and the taper inner taper hole 18, the taper sleeve hole wall 20 and the tube wall of the connecting tube 10, the outer cone inclined surface of the taper sleeve 9 and the nut inner taper hole 6 are mutually Smoothly fit together as much as possible, and then screw the nut threaded hole 1 1 of the coupling nut 3 to the external thread of the joint 1 through the threaded connection 2 until the hand feels tight, and then apply a torque to the nut 3 through the wrench. Until the nut 3 is not actuated, at this time, the taper taper angle 21 is tapered into the inner taper hole 6 of the nut and the connecting pipe 10 to realize the connection pipe sealing, and is pressed and fixed in the outer frustum 5 and the taper sleeve of the joint. The bell mouth 7 between the tapered holes 18 achieves a bell seal and the connection is completed. When the present invention is implemented by using a taper sleeve having a horn groove on the inner taper hole, the flare length of the bell mouth 7 should be based on the length of the horn groove 24 on the taper hole 18 in the taper sleeve, so that the bell mouth 7 is completely set. In the speaker slot 24, the remaining connection method is the same as the above-mentioned implementation method. FIG. 4 is a taper sleeve with a bell groove in the taper sleeve, and 24 is a speaker slot on the inner taper hole of the taper sleeve. FIG. In the invention, the inside of the cone hole is provided with a sealing structure of the speaker groove sleeve, wherein 27 is a metal hard seal, 28 is a joint outer frustum and a bell mouth seal, 29 is a bell mouth and a bell groove seal, and 28 and 29 constitute a bell groove seal. 30 is the nut inner cone hole and the cone sleeve cone angle sealing, 31 is the cone sleeve cone The bevel is sealed to the connecting pipe wall, 30 and 31 constitute a connecting pipe seal, and 27, 30, 31 constitute a double seal of the connecting pipe. When the invention is applied to the connection of the material of the joint 1 and the material of the connecting pipe 10 to a heterogeneous material, the nut 3 should preferably be made of stainless steel, the stainless steel is an inactive material, and the electrochemical reaction between the connection with the dissimilar metal is extremely weak, almost Can be ignored. After the connection is completed, the joint 1, the nut 3, the connecting pipe 10 are connected to the joint portion and the heat shrinkable sleeve is placed on the heat-shrinkable sleeve to further protect the outside from the outside, and the sealing effect for the long-term stability of the connection is remarkable. In FIG. 5, 25 is a nut inner taper hole in the prior art flare connection technology, and is used for sealing connection with the bell mouth 7 of the joint outer frustum 5 extrusion connecting pipe 10 in the prior art, FIG. 26 is the gap between the nut sleeve hole between the pipe itself and the nut sleeve hole after the flare connection of the prior art is connected, and is in communication with the outside. 1毫米内内。 Preferably, the difference between the two is preferably within 0.1 mm.

[0032]

Claims

Claim

1. A pipe connecting pipe fitting, comprising a nut, a joint, an outer frustum and a connecting pipe bell mouth, wherein the nut is a nut having an inner taper hole, and the inner taper hole of the nut is provided with an auxiliary The taper sleeve is a hollow taper sleeve hole, and the taper sleeve hole bottom is provided with a taper sleeve inner taper hole, the taper sleeve sleeve wall and the taper sleeve outer cone slope surface form a cone sleeve cone angle, and the joint outer frustum extrusion connection tube speaker In the mouth, the inner cone hole of the taper sleeve is pressed by the bell mouth of the connecting pipe, and the taper angle of the taper sleeve is squeezed between the taper hole of the nut and the connecting pipe to realize the sealing pipe joint of the taper sleeve hole and the connecting pipe, and the bell mouth of the connecting pipe is sealed The bell mouth is sealed between the outer frustum of the joint and the inner taper hole of the taper sleeve, and the direction of the taper angle of the taper sleeve is opposite to the direction in which the nut is screwed.

2. A pipe connecting pipe fitting, comprising a nut, a joint, an outer frustum and a connecting pipe bell mouth, wherein the nut is a nut having an inner taper hole, and the inner taper hole of the nut is provided with an auxiliary The taper sleeve is a hollow taper sleeve hole, and the taper sleeve hole bottom is provided with a taper sleeve inner taper hole, the taper sleeve inner cone hole is provided with a speaker slot, the taper sleeve hole wall and the taper sleeve outer cone slope face form a cone sleeve cone oblique Angle, the outer frustum of the joint squeezes the bell mouth of the connecting pipe and the inner taper hole of the pressing taper sleeve, and squeezes the taper angle of the taper sleeve between the taper hole of the nut and the connecting pipe to realize the sealing pipe seal of the taper sleeve hole and the connecting pipe And the metal hard seal between the outer frustum of the joint and the inner taper hole of the taper sleeve, the bell mouth of the connecting pipe is squeezed between the outer frustum of the joint and the speaker groove on the inner taper hole of the taper sleeve to realize the bell groove seal, the cone sleeve cone The direction of the oblique extrusion is opposite to the direction in which the nut is screwed.

3. The pipe connection pipe fitting according to claim 1 or claim 2, wherein the taper angle of the taper hole taper is equal to the taper angle of the outer frustum cone of the joint or the taper angle of the taper cone of the taper sleeve is smaller than The taper taper angle of the joint is 0 to 15 degrees.

4. The pipe connecting pipe fitting according to claim 1 or claim 2, wherein: the bottom diameter of the outer frustum of the joint is less than or equal to the bottom diameter of the taper sleeve, and the bottom diameter of the taper sleeve is less than or equal to the bottom diameter of the inner taper hole of the nut. The height of the cone sleeve is less than or equal to the height of the cone inside the nut, and the angle of the cone sleeve is less than or equal to the angle of the cone cone inside the nut.

5. A pipe connection pipe according to claim 1 or claim 2, wherein the taper angle of the inner taper cone is less than 12 degrees.

6. A pipe connecting pipe according to claim 1 or claim 2, wherein the height of the taper hole and the height of the taper hole in the nut are both greater than 3, and the height of the taper sleeve is greater than 2 draws. Replacement page (Article 26)