阅读说明：本技术 一种高压软硬管路连接密封系统 (High-pressure soft and hard pipeline connection sealing system ) 是由 谈士力 卢春鸿 宋晓伟 于 2019-01-30 设计创作，主要内容包括：本发明涉及一种高压软硬管路连接密封系统,包括软管、硬管、过渡接头,所述过渡接头的两端分别与软管及硬管连接,在软管及过渡接头的外侧进行橡胶层包胶,所述过渡接头外包覆的橡胶层上扣压有扣套。与现有技术相比,本发明能够大大提升软硬管之间的密封性能,从而使得本申请能够在高低温及高压气氛中使用,进而可以在新能源汽车的空调管路中使用。(The invention relates to a high-pressure soft and hard pipeline connection sealing system which comprises a hose, a hard pipe and a transition joint, wherein two ends of the transition joint are respectively connected with the hose and the hard pipe, rubber layers are coated on the outer sides of the hose and the transition joint, and a buckle sleeve is buckled on the rubber layer coated outside the transition joint. Compared with the prior art, the sealing performance between the soft and hard pipes can be greatly improved, so that the sealing device can be used in high-low temperature and high-pressure atmosphere, and further can be used in air-conditioning pipelines of new energy automobiles.)

1. A high-pressure soft and hard pipeline connection sealing system comprises a hose and a hard pipe and is characterized in that,

also comprises a transition joint, the wall thickness of the transition joint is 5 to 20 times of that of the hose,

two ends of the transition joint are respectively connected with the hose and the hard pipe, rubber layer encapsulation is carried out on the outer sides of the hose and the transition joint,

and a buckle sleeve is buckled and pressed on the rubber layer coated outside the transition joint.

2. The high pressure hard and soft pipe connection sealing system of claim 1, wherein the flexible pipe is a metal bellows.

3. The high pressure soft and hard pipe connection sealing system of claim 2, wherein the hose is a metal bellows made of stainless steel.

4. The high pressure soft or hard pipe connection sealing system of any one of claims 1 to 3, wherein the hose is cut to a predetermined length and then connected to the transition joint.

5. The high pressure hard and soft pipe connection sealing system of claim 1, wherein said rubber layer comprises:

the corrugated pipe comprises a rubber inner layer wrapped outside the metal corrugated pipe, a reinforcing layer wound and woven outside the rubber inner layer, and a rubber outer layer wrapped outside the reinforcing layer.

6. The high-pressure soft-hard pipeline connection sealing system as claimed in claim 5, wherein the hose is connected with the transition joint by welding or interference riveting.

7. The high pressure hard and soft pipe connection sealing system of claim 6, wherein the hose is inserted between the rear end faces of the transition joints for welding.

8. The high pressure hard and soft pipe connection sealing system of claim 6, wherein the hose is welded to the transition joint via a contact surface.

9. The high pressure hard and soft plumbing connection sealing system of any one of claims 5-8, wherein the hose is connected to the transition joint by laser welding, brazing, or plasma arc welding.

10. The high pressure hard and soft pipe connection sealing system of claim 9, wherein the hose and the transition joint are laser welded, and the reinforcement layer is an aramid fiber woven layer, a polyester fiber woven layer, or a metal wire woven layer.

11. The high pressure hard and soft pipe connection sealing system of claim 9, wherein the hose is connected to the transition joint by brazing, and the reinforcement layer is an aramid fiber braided layer, a polyester fiber braided layer, or a metal wire braided layer.

12. The high pressure hard and soft plumbing connection sealing system of claim 10 or 11, wherein said wire braid is made of brass plated alloy steel.

13. The high-pressure soft-hard pipeline connection sealing system as claimed in claim 1, wherein the transition joint is made of stainless steel, and the outer side surface is provided with annular protrusions parallel to each other.

14. The high-pressure soft and hard pipeline connection sealing system of claim 1 or 13, wherein the outer end face of the transition joint extends out of the rubber layer and is connected with the hard pipe.

15. The high pressure hard and soft pipe connection sealing system of claim 1, wherein the buckle sleeve is riveted to the transition joint.

16. The high-pressure soft-hard pipeline connecting and sealing system as claimed in claim 1 or 15, wherein the inner side surface of the buckle sleeve is provided with annular protrusions which are parallel to each other.

17. The high pressure hard and soft pipe connection sealing system of claim 1, wherein the hard pipe is connected with the transition joint by welding or interference riveting.

18. The high pressure hard and soft pipe connection sealing system of claim 1 or 17, wherein the hard pipe and the transition joint are connected by laser welding, brazing, plasma arc welding, argon arc welding or induction welding.

19. The high pressure soft or hard pipe connection sealing system of claim 1 or 17, wherein the hard pipe is a stainless steel pipe.

20. The high-pressure soft-hard pipeline connection sealing system as claimed in claim 1 or 13, wherein the outer surface of the transition joint extending out of the rubber layer is embedded with an aluminum alloy joint.

21. The high-pressure soft-hard pipeline connection sealing system of claim 20, wherein a copper ring is further arranged between the outer surface of the transition joint and the inner side surface of the aluminum alloy joint.

22. The high pressure hard and soft pipe connection sealing system of claim 20, wherein an outer buckle is fastened to the outer surface of the aluminum alloy joint.

23. The high-pressure soft-hard pipeline connection sealing system of claim 20, wherein the outer end face of the aluminum alloy joint is connected with a hard pipe made of an aluminum alloy material.

24. The high pressure hard and soft pipe connection sealing system of claim 22, wherein the aluminum alloy joint is welded to the hard pipe made of aluminum alloy.

Technical Field

The invention relates to a connecting mechanism, in particular to a high-pressure soft and hard pipeline connecting and sealing system.

Background

With the continuous improvement of the demand of consumers for comfort experience, the country pays more and more attention to environmental protection, and new energy electric transportation becomes a trend. The new energy electric automobile has the key effects on the popularization of urban electric traffic, the prolonging of the service life of a battery, the improvement of the endurance capacity and the improvement of the performance of a driving system by improving the endurance mileage and thermal management.

At present, a heat pump air conditioner is an effective solution for heating of a pure electric vehicle. The heat pump air conditioner is a few feasible technologies to ensure low-energy-consumption heating under the condition that the power battery does not have breakthrough development, the efficiency coefficient is much higher than that of PTC heating, and the endurance mileage can be effectively prolonged.

The traditional air conditioner refrigerant is R134a, and the pressure of the air conditioning system can be divided into high pressure and low pressure according to the working conditions, wherein: the high pressure is about 13bar, and the low pressure is 1bar-3 bar. Therefore, R134a is only used as a substitute in transition to environment-friendly products, and complete elimination is only a time problem. The refrigerant of the heat pump air conditioner adopts R744 (CO)₂) The carbon dioxide refrigerant and the working pressure of the high-pressure pipe are 170bar, and the highest pressure in the pipeline can reach 300bar under extreme high-temperature climatic conditions. The working pressure of the low-pressure pipe is 130bar, and similarly, the pressure in the pipeline can also greatly rise under the extreme high-temperature climate condition. Meanwhile, the working temperature is lowest at 40 ℃ below zero and highest at 180 ℃. Therefore, the conventional automobile air-conditioning hose assembly cannot withstand the requirements of ambient temperature of-40 ℃ to 180 ℃, system pressure of 130bar and 170bar (ultimate pressure of 300 bar). If the novel energy automobile can not bear high temperature and high pressure, the novel energy automobile can only adopt the heating wires to heat the air conditioner and can not adopt the heat pump technology to heat. The heating wire is adopted for heating, so that the endurance mileage of the automobile is greatly reduced; if all the hard pipes are connected, although the sealing problem of the pipeline can be solved, the hard pipes cannot be completely adopted due to the limitation of the internal space of the automobile, and a pipeline assembly combining a hose and the hard pipes is required to be adopted. Therefore, it is an urgent technical problem to provide an air conditioning pipeline capable of using a carbon dioxide refrigerant and adapting to high-low temperature alternation and high-pressure working conditions, and the sealing performance of a connecting piece needs to be strictly ensured to adapt to high-low temperature and high-pressure atmosphere.

Chinese patent CN102478139B discloses a catheter joint, which comprises a soft tube, a hard tube and a sleeve. The hard tube includes an insertion portion that is inserted into the soft tube from an end of the soft tube. The sleeve is disposed radially outside the insertion portion and the soft tube, and presses the soft tube against the insertion portion. The insertion portion includes a corrugated surface provided on an outer surface of the insertion portion and a cylindrical surface provided on an outer surface on a tip side of the insertion portion. The sleeve includes a first small diameter portion disposed radially outside the corrugated surface and pressing the soft tube toward the corrugated surface, and a second small diameter portion disposed radially outside the cylindrical surface and pressing the soft tube toward the cylindrical surface. Although the patent can also realize the connection between the soft and hard pipes, the conduit joint cannot be used under high pressure conditions, and therefore, the conduit joint cannot be applied to new energy electric vehicles.

Chinese patent CN108916498A discloses a connection structure of an R744 air-conditioning pipe and a conversion connection component, which comprises the R744 air-conditioning pipe and the conversion connection component, wherein the R744 air-conditioning pipe sequentially comprises a barrier layer, a first rubber layer, a reinforcing layer and a second rubber layer from inside to outside; conversion coupling assembling includes connector, conversion connecting pipe, outer tube, and the one end of connector and the one end fixed connection of barrier layer, conversion connecting pipe comprise cup joint portion and pipe connection portion, cup joint portion configuration is in on the connector, the outer tube configuration is in second rubber layer and cup joint portion back, and the outer tube is fixed with second rubber layer and cup joint portion, be equipped with the assembly groove on the global of connector, be equipped with on the inner peripheral face of cup joint portion with the boss that the assembly groove corresponds makes the boss that cup joints in the portion cooperate to under withholding the effort behind in the assembly groove for cup joint portion and connector are fixed as an organic whole. However, since the sealing ring is used for sealing, the leakage of gas is caused by the aging characteristics of the rubber material of the sealing ring and other parts in the high and low temperature atmosphere under the working condition. And when the connecting structure is buckled and pressed, deformation martensite or austenite twin crystals are generated due to deformation of the stainless steel material, and the area containing the deformation martensite or austenite twin crystals is easy to crack, so that leakage is easy to occur.

Disclosure of Invention

The invention aims to overcome the defects in the prior art, and provides a high-pressure soft and hard pipeline connecting and sealing system which has the characteristics of high pressure bearing, high temperature resistance and vibration resistance, so that the system can be applied to a high-pressure air conditioning pipeline and is convenient to use in a new energy electric automobile.

The purpose of the invention can be realized by the following technical scheme:

a high-pressure soft and hard pipeline connection sealing system comprises a hose, a hard pipe, a transition joint and a buckle sleeve.

The wall thickness of the transition joint is 5-20 times of that of the hose, two ends of the transition joint are respectively connected with the hose and the hard pipe, rubber layer encapsulation is carried out on the outer sides of the hose and the transition joint, and a buckle sleeve is buckled on the rubber layer which is wrapped outside the transition joint.

Preferably, the hose used is a metal bellows.

More preferably, the metal bellows used is a stainless steel metal bellows.

Preferably, during production, the metal corrugated pipe is firstly cut into a specified length and then connected with the transition joint, so that the situation that the metal corrugated pipe is firstly coated with rubber, then a pipe fitting is cut out, then the transition joint is welded, the outer side of the joint is not coated with the rubber layer, and the buckling position of the buckle sleeve cannot be positioned on the outer side of the transition joint can be well avoided. If the rubber layer on the outer side of the metal corrugated pipe is buckled and pressed, the corrugated pipe in a buckling and pressing stress area can deform, deformed martensite or austenite twin crystals can be generated in a material structure, and the deformation area of the corrugated pipe is easy to crack under high pressure, so that leakage is caused.

Preferably, the rubber layer includes: the corrugated pipe comprises a rubber inner layer wrapped outside the metal corrugated pipe, a reinforcing layer wound and woven outside the rubber inner layer, and a rubber outer layer wrapped outside the reinforcing layer.

Preferably, the hose is connected to the transition joint by welding, or may be riveted.

During riveting connection, interference riveting connection between the hose and the transition joint can be realized through extrusion.

When in welding connection, the hose can be inserted into the transition joint and then welded through the contact surface, or the hose and the end surface of the transition joint can be welded and connected.

More preferably, the metal bellows and the transition joint are connected by laser welding, copper brazing or plasma arc welding.

More preferably, the metal corrugated pipe and the reinforcing layer used after the transition joint is welded are high-strength aramid fiber wires, polyester wires or metal wire braided layers, and the metal wire braided layers can be preferably adopted, so that the strength and the bending resilience of the hose are ensured.

More preferably, the metal corrugated pipe and the transition joint are brazed through copper, the metal corrugated pipe is actually subjected to solid solution treatment in the brazing treatment process, martensite or austenite twin crystals in the metal corrugated pipe material can be eliminated through the welding mode, the used reinforcing layer is a high-strength aramid yarn, a polyester yarn or a metal wire braid layer, and the high-strength aramid yarn and the polyester yarn can be preferably adopted to ensure the strength of the hose.

More preferably, the metal wire braid is made of brass plated alloy steel.

Preferably, the outer side surface of the transition joint is provided with annular bulges which are parallel to each other, so that the axial pull-out resistance of the joint after rubber coating is stronger, and the outer end surface of the transition joint extends out of the rubber layer and is connected with the hard pipe.

Preferably, the buckle sleeve is connected with the transition joint through riveting, the inner side surface of the buckle sleeve is provided with annular dentate bulges which are parallel to each other, the end parts of the annular dentate bulges are provided with bosses, the bosses of the buckle sleeve are clamped into the grooves at the end parts of the transition joint through riveting during buckling, and the annular dentate bulges are clamped into rubber at the outer side of the joint, so that the axial pull-out resistance of the transition joint can be greatly increased.

Preferably, the hard pipe used can be a stainless steel pipe or an aluminum alloy pipe, and is connected with the transition joint in a welding mode or in an interference riveting mode.

More preferably, the hard tube and the transition joint are connected by laser welding, copper brazing, plasma arc welding, argon arc welding or induction welding.

Preferably, the outer surface of the transition joint extending out of the rubber layer is embedded with an aluminum alloy joint, the aluminum alloy joint and the transition joint are connected in an interference fit mode, and the outer surface of the transition joint is still provided with annular tooth-shaped protrusions, so that the axial tensile force of the aluminum alloy joint is stronger when the aluminum alloy joint is buckled and pressed for connection, and the high-pressure-resistant sealing capacity is improved.

More preferably, still be equipped with the copper ring between the surface of transition joint and the aluminum alloy connects the inboard, utilize the copper ring to make the sealed effect between transition joint and the aluminum alloy connect better.

The aluminum alloy connector is characterized in that an outer side buckling sleeve is buckled on the outer surface of the aluminum alloy connector, the inner surface of the outer side buckling sleeve is of a protruding annular tooth-shaped structure, so that the aluminum alloy connector is clamped when buckled, the axial tensile force can be greatly increased, the high-pressure-resistant sealing capacity is improved, a circle of positioning grooves are further formed in the aluminum alloy connector, the outer side buckling sleeve can be conveniently buckled in the positioning grooves, and the position of the outer side buckling sleeve in the axial direction is fixed.

When setting up the aluminum alloy connects, the hard tube of its outer terminal surface welded connection aluminum alloy material through interconnect between the knot cover of the same kind of material and the hard tube, thereby further reduced under high low temperature and high pressure condition link because the deformation that the environmental change caused differs the possibility that takes place to leak, more convenient use in the new energy automobile field.

Because the hose formed by the metal corrugated pipe cannot bear the stress in the axial direction, the hose is buckled and pressed on the rubber hose by the traditional structure, the inner layer corrugated pipe is deformed due to the radial stress, and the material structure has deformed martensite or austenite twin crystals to reduce the material strength and influence the pressure-bearing performance of the product. After the metal corrugated pipe is welded and connected with the transition joint, the buckling position is arranged at the rubber part on the outer side of the transition joint, the radial stress of the inner corrugated pipe is avoided when the rubber pipe is buckled, the corrugated pipe is not deformed, and deformed martensite or austenite twin crystals are not formed in the structure, so that the bearing performance between the soft pipe and the hard pipe can be greatly improved, and the corrugated pipe can be used in the actual working conditions of high-low temperature change, high-pressure state and high-strength impact, and further can be used in the air-conditioning pipeline of a new energy automobile. After the connecting system disclosed by the invention is used, the pressure bearing capacity of the connecting system is greatly improved, and the connecting system can be used for heating a new energy automobile through a heat pump, so that the endurance mileage can be obviously improved.

Compared with the prior art, the invention has the following advantages:

the method comprises the following steps of firstly, adding a transition joint, and encapsulating rubber after the joint is welded and connected with a corrugated pipe to increase the axial pull-off resistance of a soft pipe and a hard pipe;

secondly, the buckling and pressing stress position is arranged at the rubber position on the outer side of the transition joint, so that the stress of the corrugated pipe is avoided, and the strength of the metal inner layer of the hose is increased;

and thirdly, mutually riveting and clamping the lug boss at the end part of the buckle sleeve and the groove at the end part of the transition joint, and simultaneously clamping annular dentate bulges which are mutually parallel on the inner side surface of the buckle sleeve into rubber at the outer side of the joint so as to increase the axial pull-off resistance of the hard pipe and the soft pipe.

Drawings

FIG. 1 is a schematic structural view of a metal bellows before being connected to a transition joint;

FIG. 2 is a schematic structural view of a metal bellows connected to a transition joint;

FIG. 3 is a schematic view of the structure after encapsulation treatment;

FIG. 4 is a schematic view of the structure after the buckle sleeve is buckled;

FIG. 5 is a schematic structural diagram of the connected hard tubes;

FIG. 6 is a schematic view of the structure of the transition joint to which the aluminum alloy joint of example 4 is attached;

FIG. 7 is a schematic view of the structure of the transition joint to which the aluminum alloy joint of example 5 is attached;

FIG. 8 is an SEM photograph of austenite twin crystals generated by deformation of a metal corrugated pipe;

FIG. 9 is an SEM photograph of the corrugated metal pipe in example 1 without deformation and without austenite twin crystals.

In the figure, 1-metal corrugated pipe, 2-transition joint, 3-rubber layer, 4-buckle sleeve, 5-hard pipe, 6-aluminum alloy joint, 7-outer buckle sleeve, 8-positioning groove and 9-copper ring.

Detailed Description

The present invention will be described in detail with reference to specific examples. The following examples will assist those skilled in the art in further understanding the invention, but are not intended to limit the invention in any way. It should be noted that variations and modifications can be made by persons skilled in the art without departing from the spirit of the invention. All falling within the scope of the present invention.

A high pressure soft and hard pipe connection sealing system, the structure of which is shown in fig. 5, comprising: the flexible pipe comprises a flexible pipe formed by a metal corrugated pipe 1 wrapped with a rubber layer 3, and a transition joint 2 connected with the metal corrugated pipe 1, wherein the wall thickness of the transition joint 2 is greater than that of the flexible pipe, the wall thickness of the transition joint 2 is 5-20 times of that of the metal corrugated pipe 1, the outer side of the transition joint 2 is also wrapped with the rubber layer 3, a buckle sleeve 4 is buckled outside the rubber layer 3 on the outer layer of the transition joint 2, and the outer side end of the transition joint 2 is also connected with a hard pipe 5.

In the above system, the metal corrugated pipe 1 used is a stainless steel metal corrugated pipe, and the specification thereof is determined according to the application system, for example, metal corrugated pipes with different lengths and different inner diameters can be selected as hoses according to the system requirements. Both ends of the metal bellows 3 can be connected with the transition joint 2, and the structure before connection is shown in fig. 1. When connecting, the metal bellows 3 and the transition joint 2 are first connected as shown in fig. 2, and then rubber-coated with the rubber layer 1 on the outside as shown in fig. 3. And during production, the metal corrugated pipe 3 is firstly cut into a specified length and then connected with the transition joint 2, so that the situation that the outer side of the joint is not coated by a rubber layer after the pipe fitting is firstly coated with rubber, then the pipe fitting is cut out and then the transition joint is welded can be well avoided, and the buckling position of the buckling sleeve cannot be positioned on the outer side of the transition joint. If the buckle sleeve is buckled and pressed on the rubber layer on the outer side of the stainless steel corrugated pipe, the corrugated pipe in a buckling and pressing stress area can deform, a material structure forms deformed martensite or austenite twin crystals, and the deformation area of the corrugated pipe is easy to crack under high pressure to cause leakage.

In the case of encapsulation, the rubber layer 1 used includes: the metal corrugated pipe comprises a rubber inner layer wrapped outside the metal corrugated pipe 3, a reinforcing layer wound and woven outside the rubber inner layer, and a rubber outer layer wrapped outside the reinforcing layer. The reinforcement layer used may be selected according to the different connection ways of the metal bellows 3 and the transition joint 2. The metal corrugated pipe 3 is connected with the transition joint 2 in a welding way. If the welding connection is adopted, different modes such as laser welding, copper brazing, plasma arc welding and the like can be further adopted for connection, and the specific connection mode can be divided into the mode that the metal corrugated pipe is inserted into the transition joint and then is welded, and the stainless steel corrugated pipe can be welded with the end face of the transition joint.

The metal corrugated pipe and the transition joint are welded in different modes, then the rubber coating needs to be provided with enhancement layers, the used enhancement layers are high-strength aramid fiber wires, polyester wires or metal wire braided layers, and the metal wires can be made of brass-plated alloy steel, so that the strength and the bending resilience of the hose are ensured.

In the system, the used transition joint 2 is of a hollow tubular structure, the inner diameter of the transition joint is the same as that of the connected metal corrugated pipe and the hard pipe, the axial pull-off resistance of the joint is stronger after the outer side surface of the transition joint 2 is provided with the annular dentate bulges which are parallel to each other and are coated with rubber, and the outer end surface of the transition joint 2 extends out of the rubber layer to be connected with the hard pipe.

After the encapsulation process is completed, the buckle sleeve 4 is buckled and pressed outside the rubber layer wrapped outside the transition joint 2, as shown in fig. 4. The inner side surface of the buckle sleeve 4 is provided with annular dentate bulges which are parallel to each other, the end part of the buckle sleeve is provided with a boss, the boss of the buckle sleeve is riveted and clamped into the groove at the end part of the transition joint during buckling, and the annular dentate bulges are clamped into the rubber at the outer side of the joint. On the one hand, the buckling position of the buckling sleeve 4 is fixed at the transition joint, so that the problem that the inner-layer metal corrugated pipe is stressed radially due to the fact that the inner-layer metal corrugated pipe is directly buckled and pressed on the outer side of the metal corrugated pipe can be avoided, the pressure bearing performance of the hose is reduced, and meanwhile, the axial anti-pulling-off capacity of the soft pipe and the hard pipe can be further improved.

The hard pipe 5 used in the system is a stainless steel pipe, and can also be an aluminum alloy pipe or a pipeline made of other materials, and is selected according to actual needs. The hard pipe 5 is welded with the outer end of the transition joint 2. If the welding connection mode is used, various modes such as laser welding, argon arc welding and the like can be adopted for connection.

When the hard tube that uses is the aluminum alloy material, can also inlay on stretching out the outer transition joint's of rubber layer surface and have aluminum alloy joint, be connected through interference fit between this aluminum alloy joint and the transition joint, transition joint's surface still is equipped with annular dentate arch, thereby aluminum alloy joint is axial tensile release force stronger when carrying out withholding and connect, in order to promote sealing performance, can also set up the copper ring between transition joint's surface and aluminum alloy joint are inboard, utilize the copper ring to make the sealed effect between transition joint and the aluminum alloy joint better.

The outer side buckling sleeve is buckled on the outer surface of the aluminum alloy connector, the inner surface of the outer side buckling sleeve is of a protruding annular tooth-shaped structure, so that the aluminum alloy connector is clamped when buckled, the axial pull-off resistance can be greatly increased, a circle of positioning grooves are further formed in the aluminum alloy connector, and the outer side buckling sleeve can be conveniently buckled in the positioning grooves to fix the axial position of the positioning grooves. When setting up the aluminum alloy and connecting, its terminal surface welded connection aluminum alloy material's hard tube, through interconnect between the knot cover of the same kind of material and the hard tube, thereby further reduced under high low temperature and high pressure condition link because deformation that operating condition caused differs the possibility that takes place to leak, more convenient use in the new energy automobile field.

Through the special treatment of the components and the selection of the connection mode among the components, the invention can greatly improve the pressure-bearing sealing performance among the soft and hard pipes, so that the application can be used in a high-pressure state and further can be used in an air-conditioning pipeline of a new energy automobile.

The following are more detailed embodiments, and the technical solutions and the technical effects obtained by the present invention will be further described by the following embodiments.