WO2021035908A1

WO2021035908A1 - Soft and hard pipe connecting system suitable for high pressure

Info

Publication number: WO2021035908A1
Application number: PCT/CN2019/112237
Authority: WO
Inventors: 谈士力; 宋晓伟; 彭晓勇
Original assignee: 上海众源燃油分配器制造有限公司
Priority date: 2019-08-29
Filing date: 2019-10-21
Publication date: 2021-03-04
Also published as: CN112443715A

Abstract

A soft and hard pipe connecting system suitable for high pressure, comprising: a soft pipe formed by connecting a core pipe (1) and a corrugated pipe (2), wherein the outside of the soft pipe is provided with a coated rubber layer (4); a hard pipe (5); a transition joint (7) connecting the soft pipe and the hard pipe; and a buckling sleeve (8) that is buckled and pressed on the outside of the soft pipe and the transition joint. The present invention can greatly improve the sealing performance between the soft pipe and the hard pipe, and solves the problems that a connection position between the soft pipe and the hard pipe cannot bear pressure, and cannot resist a high temperature and a low temperature, thereby being capable of being used under the working conditions of the high temperature, the low temperature, and the high pressure, and further being capable of being used in an air conditioner pipeline of a new energy automobile.

Description

A flexible and hard pipe connection system suitable for high pressure

Technical field

The invention relates to a connection system, in particular to a soft and hard pipe connection system suitable for high pressure.

Background technique

As consumers' demand for comfort experience continues to increase, and the country is paying increasing attention to environmental protection, new energy electric transportation has become a trend. New energy electric vehicles have a key role in improving the driving range requirements of electric vehicles. Thermal management plays a key role in the popularization of urban electric transportation, the extension of battery life, the improvement of endurance and the improvement of drive system performance.

At present, the heat pump air conditioner is an effective solution for the heating of pure electric vehicles. In the absence of breakthroughs in power batteries, low energy consumption heating must be ensured. Heat pump air conditioning is one of the few feasible technologies. The efficiency coefficient is much higher than that of PTC heating, which can effectively extend the cruising range.

The traditional air-conditioning refrigerant is R134a, and the air-conditioning system pressure can be divided into high pressure and low pressure according to the working conditions, among which: high pressure is about 13bar and low pressure is 1bar-3bar. Therefore, R134a is only used as a substitute in the transition to environmentally friendly products, and it is only a matter of time before it is completely eliminated. The heat pump air-conditioning refrigerant uses R744 (CO2) carbon dioxide refrigerant. The working pressure of the high-pressure pipe is 170bar, and the maximum pressure in the pipe can reach 300bar under extreme high temperature climatic conditions. The working pressure of the low-pressure pipe is 130bar. Similarly, the pressure inside the pipe will also rise sharply under extreme high temperature climate conditions. At the same time, the lowest working temperature is -40℃, and the highest is 180℃. Therefore, the traditional automotive air conditioning hose assembly cannot withstand the ambient temperature of -40°C to 180°C and the system pressure of 130-170bar (the ultimate pressure of 300bar). If it cannot withstand high temperature and high pressure, when used in new energy vehicles, only electric heating wires can be used for air conditioning heating, and heat pump technology cannot be used for heating. The use of electric heating wires for heating will greatly reduce the car’s cruising range; if all connections are made with hard pipes, although the sealing problem of the pipeline can be solved, due to the limitation of the car’s internal space, hard pipes cannot be used completely, and hoses and hard pipes must be used. The pipe assembly of the pipe combination. Therefore, to provide an air-conditioning pipeline that can use carbon dioxide refrigerant and adapt to high and low temperature alternating and high pressure working conditions, it is necessary to strictly ensure the tightness of the connector to adapt to the high and low temperature and high pressure atmosphere. This is a technical problem that needs to be solved urgently.

Chinese patent CN102478139B discloses a pipe joint including a soft pipe, a hard pipe and a sleeve. The hard tube includes an insertion part that is inserted into the soft tube from the end of the soft tube. The sleeve is arranged radially outside the insertion part and the soft tube, and presses the soft tube toward the insertion part. The insertion portion includes a corrugated surface provided on the outer surface of the insertion portion and a cylindrical surface provided on the outer surface on the tip side of the insertion portion. The sleeve includes a first small diameter part and a second small diameter part. The first small diameter part is arranged radially outside the corrugated surface and presses the soft tube against the corrugated surface, and the second small diameter part is arranged in the radial direction of the cylindrical surface. Externally and press the flexible tube to the cylindrical surface. Although this patent can also realize the connection between soft and hard pipes, this kind of pipe joint cannot be used under high pressure conditions, so it cannot be used in new energy electric vehicles.

Summary of the invention

The purpose of the present invention is to overcome the above-mentioned defects in the prior art and provide a flexible and hard pipe connection system suitable for high pressure, which solves the problem of the inability to bear pressure and resistance to high and low temperatures at the connection of the flexible and hard pipes.

The purpose of the present invention can be achieved through the following technical solutions:

A flexible and hard pipe connection system suitable for high pressure, including:

It is composed of a core tube connected with a corrugated tube, and a rubberized hose is provided on the outside.

Hard tube,

A transition joint connecting the hose and the hard tube,

A buckle sleeve crimped on the outside of the hose and the transition joint.

The two ends of the corrugated tube are connected to the core tube by welding, riveting or rolling interference.

The welding includes laser welding, argon arc welding, copper brazing or plasma welding.

In order to meet the requirements of continuous production of hoses, the hoses are provided with several hoses, and adjacent hoses are connected with each other through a nylon traction tube through a rubber coating.

The nylon traction tube extends into the mouth of the core tube for interference fit connection or threaded connection.

After the hose is encapsulated, it is cut into a hose with a specified length through processing, and then connected with the transition joint.

The hose is processed to remove the rubber on the outside of the hose and expose the toothed part of the core tube.

The exposed core tube tooth part of the hose is inserted into the transition joint to form an interference or clearance fit.

The encapsulation is a coated rubber layer.

The rubber layer includes: an inner rubber layer wrapped around the core tube and the corrugated tube, a reinforcing layer wound and braided outside the inner rubber layer, and an outer rubber layer wrapped outside the reinforcing layer.

The hard tube material is aluminum, stainless steel or other metals.

The hard tube is connected with the transition joint by flame brazing, high frequency induction welding, cold welding, brazing or laser welding.

The hard tube is connected to the pressure plate by flame brazing, high frequency induction welding, cold welding, brazing, and laser welding relative to the other side of the transition joint.

The transition joint is provided with a concave ring groove.

The material of the buckle sleeve is aluminum, stainless steel or other metals, and one end of the buckle sleeve is convex inward, and this part is inserted into the concave ring groove of the transition joint during the crimping.

The inner surface of the aluminum buckle sleeve is a flat structure without a ring-shaped inner convex structure. Because the material of aluminum is relatively soft, the inner surface will change with the shape of the outer surface of the transition joint during the subsequent buckle processing. The outer surface of the transition joint is provided with an annular groove, and the inner surface of the buckle sleeve will form an inner convex structure following the shape of the annular groove, and the inner convex structure will be pressed into the annular groove to realize a tight connection between the buckle sleeve and the transition joint.

The inner surface of stainless steel or other metals is provided with a ring-shaped inner convex structure, and the buckle sleeve and the transition joint are tightly connected through the inner convex structure.

The buckle sleeve is radially applied to the buckle sleeve through the die on the crimping machine, and the outer diameter of the buckle sleeve is compressed to reach the extruded transition joint to realize the riveting connection between the transition joint and the core tube and the buckle sleeve to achieve sealing and pull-off resistance. effect.

The die on the crimping machine is squeezed integrally or locally along the circumferential outer wall of the buckle sleeve.

Compared with the prior art, the present invention mainly solves the pressure bearing and high and low temperature resistance problems of the soft and hard pipe joints, and has the following advantages:

1. Improve the reliability of the seal by welding the corrugated tube and the core tube;

2. Continuously encapsulating the corrugated tube and core tube assembly by pulling each other to achieve mass continuous production;

3. By encapsulating the corrugated tube and the core tube assembly as a whole, the inner rubber is filled with the corrugated tube and the core tube groove, thereby reducing the deformation of the corrugated tube, avoiding the generation of deformed martensite, and enhancing the pressure resistance of the hose;

4. The transition joint is connected with the buckle sleeve and the core tube through the integral crimping of the buckle sleeve to realize the conversion of hard pipes of different metal materials and the sealing of the crimping part without being affected by temperature;

5. By adopting the above-mentioned comprehensive technical solution, the performance of the hose assembly is greatly improved. The application can withstand the test of high-pressure working conditions and the pressure-bearing and sealing ability of the hose assembly does not decrease in high and low temperature environments;

6. The overall environment of the pipeline in this design is completely similar to a high-pressure vessel, and each link bears the pressure evenly, so that the working medium will not contact the rubber parts, and the material will not yield and cause leakage.

Description of the drawings

Figure 1 is a schematic diagram of the structure of the hose before encapsulation;

Figure 2 is a schematic diagram of the structure of the hose obtained after encapsulation;

Figure 3 is a schematic diagram of the structure of the hard tube;

Figure 4 is a schematic diagram of the connection between the hard pipe and the transition joint;

Figure 5 is a schematic diagram of the structure before the hose and the hard pipe are connected;

Figure 6 is a structural diagram of a flexible and hard pipe connection system suitable for high pressure;

7 is a schematic diagram of the connection structure of multiple hoses in Embodiment 2;

Figure 8 is a schematic diagram of the structure of the encapsulation after multiple hoses are connected;

9 is a schematic diagram of the connection structure between the buckle sleeve and the transition joint before processing in Example 6;

Figure 10 is a partial enlarged view of Figure 9;

11 is a schematic diagram of the connection structure between the buckle sleeve and the transition joint after processing in Embodiment 6;

Figure 12 is a partial enlarged view of Figure 11;

13 is a schematic diagram of the structure after processing the outside of the buckle sleeve in Embodiment 6;

14 is a schematic diagram of the connection structure between the buckle sleeve and the transition joint before processing in Example 7;

Figure 15 is a partial enlarged view of Figure 14;

16 is a schematic diagram of the connection structure between the buckle sleeve and the transition joint after processing in Embodiment 7;

Fig. 17 is a partial enlarged view of Fig. 16.

In the picture, 1-core tube, 2-corrugated tube, 3-nylon traction tube, 4-coated rubber, 5-hard tube, 6-pressure plate, 7-transition joint, 71-annular groove, 8-buckle sleeve, 81- Annular convex structure.

detailed description

The present invention will be described in detail below in conjunction with specific embodiments. The following examples will help those skilled in the art to further understand the present invention, but do not limit the present invention in any form. It should be pointed out that for those of ordinary skill in the art, several modifications and improvements can be made without departing from the concept of the present invention. These all belong to the protection scope of the present invention.

A flexible and hard pipe connection system suitable for high pressure, including a hose, a hard pipe, a transition joint and a buckle. The hose is composed of a core pipe and a corrugated pipe connected with a rubber encapsulation; the hard pipe and the hose pass through The cross joint is connected; the hose and the transition joint are also sleeved with a buckle sleeve.

When forming the hose, the two ends of the corrugated tube are connected to the core tube by welding, riveting or rolling interference. The welding methods that can be used include but are not limited to laser welding, argon arc welding, copper brazing or plasma welding. By adopting the above-mentioned connection method, the sealing reliability is well improved.

In order to meet the needs of continuous production of hoses, hoses can be connected to each other through multiple hoses, and adjacent hoses are connected to each other through nylon traction tubes. When connecting, the nylon traction tube extends into the core tube mouth for interference fit connection or threaded connection, and then the overall encapsulation is performed. After the encapsulation is completed, the hose is cut into a specified length through processing, and then connected with the transition joint. This encapsulation method can realize mass continuous production.

When the hose is connected to the transition joint, first remove the outer cover of the connecting end of the hose and the transition joint to expose the toothed part of the core tube, and then insert the toothed part into the transition joint. The used transition joint is provided with With the concave ring groove, there is an interference or clearance fit between the hose and the transition joint.

The encapsulation used is a coated rubber layer. The rubber layer includes an inner rubber layer wrapped around the core tube and the corrugated tube, a reinforcing layer wrapped and braided outside the rubber inner layer, and an outer rubber layer wrapped outside the reinforcing layer. The corrugated tube and the core tube assembly are integrally encapsulated, and the inner layer of rubber is filled with the corrugated tube and the core tube groove to reduce the deformation of the corrugated tube and avoid the generation of deformed martensite, thereby enhancing the pressure resistance of the hose.

The materials that can be used to make hard tubes include aluminum, stainless steel or other metals. One end of the hard tube is connected to the transition joint by flame brazing, high frequency induction welding, cold welding, brazing or laser welding, and the other end is flame brazing, high frequency induction welding, cold welding, brazing, laser welding and pressing plate or Other connection elements are connected.

The material of the buckle sleeve used is aluminum, stainless steel or other metals, and one end of the buckle sleeve is convex inward, and this part is inserted into the concave ring groove of the transition joint during crimping. The buckle sleeve applies radial force to the buckle sleeve through the mold on the crimping machine, and the outer diameter of the buckle sleeve is compressed to squeeze the transition joint to realize the riveting connection between the transition joint and the hose and the buckle sleeve to achieve the effect of sealing and anti-stretching. The die on the crimping machine can be used for overall extrusion or targeted partial extrusion along the outer circumferential wall of the buckle sleeve. The transition joint is connected with the buckle sleeve and the core tube through the integral crimping of the buckle sleeve, so as to realize the conversion of hard pipes of different metal materials and the sealing of the crimping part without being affected by temperature.

The following are more detailed implementation cases, and the technical solutions of the present invention and the technical effects that can be obtained are further explained through the following implementation cases.

Example 1

A flexible and hard pipe connection system suitable for high pressure includes a hose, a hard pipe 5, a transition joint 7, and a buckle 8. Its structure is shown in Figure 6.

The hard tube 5 in this embodiment is an aluminum hard tube, and one end is connected to the pressure plate 6 by flame brazing, and its structure is shown in FIG. 3. One end of the hard tube 5 is inserted into the transition joint 7 and connected by welding through the contact surface. The welding method is flame brazing, as shown in FIG. 4.

The hose is composed of a core tube 1 and a corrugated tube 2 connected with a rubber covering 4, as shown in Figure 1-2, the core tube 1 is connected to both ends of the corrugated tube 2 by laser welding, and the rubber covering is used. Rubber layer. The rubber layer includes an inner rubber layer wrapped around the core tube 1 and the corrugated tube 2, a reinforcing layer wrapped and braided outside the inner rubber layer, and an outer rubber layer wrapped outside the reinforcing layer. The hose is cut to the specified length and then connected to the transition joint. When the hose is connected to the transition joint 7, first remove the outer cover of the connecting end of the hose and the transition joint 7 and expose the toothed part of the core tube, and then insert the toothed part into the transition joint 7. The joint is provided with a concave ring groove, and there is an interference fit between the hose and the transition joint.

The encapsulation that constitutes the hose is a coated rubber layer. The rubber layer includes an inner rubber layer wrapped around the core tube and the corrugated tube, a reinforcing layer wrapped and braided outside the rubber inner layer, and an outer rubber layer wrapped outside the reinforcing layer. The corrugated tube and the core tube assembly are integrally encapsulated, and the inner layer of rubber is filled with the corrugated tube and the core tube groove to reduce the deformation of the corrugated tube and avoid the generation of deformed martensite, thereby enhancing the pressure resistance of the hose.

The material of the buckle sleeve 8 used is aluminum, and one end of the buckle sleeve 8 is convex inward, and this part is embedded in the concave ring groove provided in the transition joint 7 during crimping. The buckle sleeve 8 can apply radial force to the buckle sleeve through the die on the crimping machine, and the outer diameter of the buckle sleeve can be compressed to reach the squeeze transition joint to realize the riveting connection between the transition joint and the core tube and the buckle sleeve. The crimping machine can be used for specific operations. The upper die is squeezed integrally or locally along the outer wall of the buckle sleeve circumference, so as to achieve the effect of sealing and anti-stretching.

The transition joint 7 is integrally crimped by the buckle sleeve 8, and the buckle sleeve 7 and the core tube 1 are riveted and sealed, and finally a flexible and hard pipe connection system suitable for high pressure is formed. It can realize the conversion of different metal materials and the sealing of the crimped part and is not affected by temperature. influences.

The sealing performance of the high-pressure air-conditioning pipe soft and hard pipe connection sealing system produced in this embodiment is tested. When the burst pressure reaches 780 bar, it can still be used without leakage. The burst pressure of the existing ordinary air-conditioning hose is only about 100 bar. This application The use pressure of the technology is an order of magnitude higher than that of the existing technology. Among the technical requirements of the existing R744 air-conditioning pipeline, its burst pressure is 340 bar, and the actual measured value of the burst pressure of the present invention has reached twice that. In this way, the present invention can be used in the air-conditioning pipelines of new energy vehicles. Because it can withstand high pressure, heat pump technology can be used for heating, thereby avoiding the use of traditional electric heating to cause electric vehicles to have a large cruising range due to power consumption. Reduce the problem.

Example 2

A flexible and hard pipe connection system suitable for high pressure. Its structure is roughly the same as that of Embodiment 1. The difference is that there are several hoses in this application, and adjacent hoses are connected to each other through nylon traction tube 3, such as As shown in Fig. 7, when connecting, the nylon traction tube extends into the core tube mouth for interference fit connection or threaded connection, and this embodiment adopts interference connection. Then the whole encapsulation is carried out. After the encapsulation is completed, the hose is cut into a specified length through processing, and then connected with the transition joint. This encapsulation method can realize mass continuous production. After the connection is completed, encapsulation is performed, and the resulting hose is shown in Figure 8.

Example 3

When forming the hose, the two ends of the corrugated tube are connected to the core tube by riveting, which greatly improves the reliability of the seal. The rubber encapsulation on the outside of the hose is a covered rubber layer. The rubber layer includes an inner rubber layer wrapped around the core tube and the corrugated tube, a reinforcing layer wrapped and braided outside the rubber inner layer, and an outer rubber layer wrapped outside the reinforcing layer. The corrugated tube and the core tube assembly are integrally encapsulated, and the inner layer of rubber is filled with the corrugated tube and the core tube groove to reduce the deformation of the corrugated tube and avoid the generation of deformed martensite, thereby enhancing the pressure resistance of the hose.

When the hose is connected to the transition joint, first remove the outer cover of the connecting end of the hose and the transition joint to expose the toothed part of the core tube, and then insert this part into the transition joint. The transition joint used is provided with a recess There is a clearance fit between the ring groove, the hose and the transition joint before crimping.

In this embodiment, a stainless steel tube is used as the hard tube. One end of the hard tube is connected to the transition joint by high-frequency induction welding, and the other end is connected to the pressure plate by cold welding.

The material of the buckle sleeve used is stainless steel, and one end of the buckle sleeve is convex inward, and this part is inserted into the concave ring groove of the transition joint during crimping. The buckle sleeve applies radial force to the buckle sleeve through the mold on the crimping machine, and the outer diameter of the buckle sleeve is compressed to squeeze the transition joint to realize the riveting connection between the transition joint and the hose and the buckle sleeve to achieve the effect of sealing and anti-stretching. The die on the crimping machine can be used for overall extrusion or targeted partial extrusion along the outer circumferential wall of the buckle sleeve. The transition joint is connected with the buckle sleeve and the core tube through the integral crimping of the buckle sleeve, so as to realize the conversion of hard pipes of different metal materials and the sealing of the crimping part without being affected by temperature.

Example 4

When forming the hose, the two ends of the corrugated tube are connected to the core tube by rolling interference. In order to meet the needs of continuous production of the hose, the hoses can be connected to each other through multiple hoses. The adjacent hoses are connected to each other through the nylon traction tube. connection. When the hose is connected to the transition joint, first remove the outer cover of the connecting end of the hose and the transition joint to expose the toothed part of the core tube, and then insert this part into the transition joint. The transition joint used is provided with a recess There is an interference fit between the ring groove, the hose and the transition joint.

In this embodiment, alloy steel is used as the hard tube. One end of the hard tube is connected to the transition joint by brazing, and the other end is connected to the pressure plate by laser welding.

The material of the buckle sleeve used is alloy steel, and one end of the buckle sleeve is convex inward, and this part is inserted into the concave ring groove of the transition joint during crimping. The buckle sleeve applies radial force to the buckle sleeve through the mold on the crimping machine, and the outer diameter of the buckle sleeve is compressed to achieve the squeezing transition joint to realize the riveting connection between the transition joint and the core tube and the buckle sleeve to achieve the effect of sealing and anti-stretching. The die on the crimping machine can be used for overall extrusion or targeted partial extrusion along the outer circumferential wall of the buckle sleeve. The transition joint is connected with the buckle sleeve and the core tube through the integral crimping of the buckle sleeve, so as to realize the conversion of hard pipes of different metal materials and the sealing of the crimping part without being affected by temperature.

Example 5

When forming the hose, the two ends of the corrugated tube are welded to the core tube by argon arc, which greatly improves the reliability of the seal. The rubber encapsulation on the outside of the hose is a covered rubber layer. The rubber layer includes an inner rubber layer wrapped around the core tube and the corrugated tube, a reinforcing layer wrapped and braided outside the rubber inner layer, and an outer rubber layer wrapped outside the reinforcing layer. The corrugated tube and the core tube assembly are integrally encapsulated, and the inner layer of rubber is filled with the corrugated tube and the core tube groove to reduce the deformation of the corrugated tube and avoid the generation of deformed martensite, thereby enhancing the pressure resistance of the hose.

When the hose is connected to the transition joint, first remove the outer cover of the connecting end of the hose and the transition joint to expose the toothed part of the core tube, and then insert this part into the transition joint. The transition joint used is provided with a recess There is a clearance fit between the ring groove, the hose and the transition joint.

In this embodiment, carbon steel is used as the hard tube. One end of the hard tube is connected to the transition joint by high-frequency induction welding, and the other end is connected to the pressure plate by cold welding.

The material of the buckle sleeve used is carbon steel, and one end of the buckle sleeve is convex inward, and this part is inserted into the concave ring groove of the transition joint during crimping. The buckle sleeve applies radial force to the buckle sleeve through the mold on the crimping machine, and the outer diameter of the buckle sleeve is compressed to achieve the squeezing transition joint to realize the riveting connection between the transition joint and the core tube and the buckle sleeve to achieve the effect of sealing and anti-stretching. The die on the crimping machine can be used for overall extrusion or targeted partial extrusion along the outer circumferential wall of the buckle sleeve. The transition joint is connected with the buckle sleeve and the core tube through the integral crimping of the buckle sleeve, so as to realize the conversion of hard pipes of different metal materials and the sealing of the crimping part without being affected by temperature.

Example 6

A flexible and hard pipe connection system suitable for high pressure. Its composition and processing technology are roughly the same as those of embodiment 1. It needs special explanation that in this embodiment, the buckle 8 is made of aluminum, and the buckle 8 is made of aluminum. The inner surface has a flat structure before processing, and there is no annular convex structure, as shown in Figure 9-10. Since the material of aluminum is relatively soft, the inner surface will change with the shape of the outer surface of the transition joint during the subsequent buckle processing. The outer surface of the transition joint 7 is provided with an annular groove 71, and the inner surface of the buckle 8 will change As the shape of the annular groove 71 forms an inner convex structure, the inner convex structure will be pressed into the annular groove 71 to achieve a tight connection between the buckle sleeve and the transition joint. As shown in Figure 11, the assembly is completed, and it can also be buckled. The outer surface of the sleeve 8 is crimped as needed, and the final structure is shown in Figure 12-13.

Example 7

A flexible and hard pipe connection system suitable for high pressure. Its composition and processing technology are roughly the same as those of Embodiment 1. It needs special explanation that in this embodiment, the buckle sleeve 8 used is made of stainless steel, and because the material is relatively hard, Therefore, it is necessary to provide a ring-shaped convex structure 81 on the inner surface of the buckle 8 before processing. The transition joint 7 used in this embodiment is made of aluminum, and its surface is flat before the connection processing is shown in Figure 14- As shown in 15, through the crimping process, the buckle sleeve 8 is embedded into the outer surface of the transition joint 7, and the annular convex structure 81 provided on the inner surface of the buckle sleeve 8 will be pressed into the outer surface of the transition joint 7. A groove that matches the ring-shaped inner convex structure 81 is formed, so that the buckle sleeve 8 is tightly connected with the transition joint 7, as shown in Figs. 16-17.

In the description of the present invention, it needs to be understood that the terms, "one end", "the other end", "inner" and the like indicate the orientation or positional relationship, which are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying the meaning. The component or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention.

In the description of this specification, the description with reference to the terms "one embodiment", "example", "specific example", etc. means that the specific feature, structure, material, or characteristic described in combination with the embodiment or example is included in the utility model. In at least one embodiment or example. In this specification, the schematic representation of the above-mentioned terms does not necessarily refer to the same embodiment or example. Moreover, the described specific features, structures, materials or characteristics may be combined in any one or more embodiments or examples in a suitable manner.

The above description of the embodiments is to facilitate those of ordinary skill in the technical field to understand and use the invention. It is obvious that those skilled in the art can easily make various modifications to these embodiments, and apply the general principles described here to other embodiments without creative work. Therefore, the present invention is not limited to the above-mentioned embodiments. According to the disclosure of the present invention by those skilled in the art, all improvements and modifications made without departing from the scope of the present invention should fall within the protection scope of the present invention.

Claims

A flexible and hard pipe connection system suitable for high pressure, which is characterized in that it comprises:

It is composed of a core tube connected with a corrugated tube, and a rubberized hose is provided on the outside.

Hard tube,

A transition joint connecting the hose and the hard tube,

A buckle sleeve crimped on the outside of the hose and the transition joint.
The flexible and hard pipe connection system suitable for high pressure according to claim 1, wherein the two ends of the corrugated pipe are connected to the core pipe by welding, riveting or rolling interference.
The flexible and hard pipe connection system suitable for high pressure according to claim 2, wherein the welding includes laser welding, argon arc welding, copper brazing or plasma welding.
The flexible and hard pipe connection system suitable for high pressure according to any one of claims 1 to 3, characterized in that, in order to meet the needs of continuous production of hoses, the hoses are provided with several, adjacent hoses They are connected with each other via a nylon traction tube via encapsulation.
The flexible and rigid pipe connection system suitable for high pressure according to claim 4, wherein the nylon traction pipe extends into the core pipe mouth for interference fit connection or threaded connection.
The flexible and hard pipe connection system suitable for high pressure according to claim 4, characterized in that the hose is cut into a hose with a specified length through processing after encapsulation, and then connected with the transition joint.
The flexible and hard pipe connection system suitable for high pressure according to claim 1 or 6, characterized in that, the outer encapsulation of the hose is removed by processing the hose, and the toothed part of the core pipe is exposed.
The flexible and hard pipe connection system suitable for high pressure according to claim 7, wherein the exposed core pipe toothed part of the hose is inserted into the transition joint to form an interference or clearance fit.
The flexible and hard pipe connection system suitable for high pressure according to claim 7, characterized in that the encapsulation is a coated rubber layer.
According to claim 9, a flexible and hard pipe connection system suitable for high pressure, wherein the rubber layer comprises: an inner rubber layer wrapped around the core pipe and the corrugated pipe, wound and braided on the The reinforcing layer outside the rubber inner layer and the rubber outer layer covering the reinforcing layer.
The flexible and hard pipe connection system suitable for high pressure according to claim 1, wherein the material of the hard pipe is aluminum, stainless steel or other metals.
The flexible and hard pipe connection system suitable for high pressure according to claim 1 or 11, wherein the hard pipe is connected to the hard pipe by flame brazing, high frequency induction welding, cold welding, brazing or laser welding. Transition joint connection.
A flexible and hard pipe connection system suitable for high pressure according to claim 1 or 11, wherein the hard pipe is flame brazed, high-frequency induction welding, or high-frequency induction welding on the other side of the hard pipe connected to the transition joint. Cold welding, brazing, laser welding and pressing plate connection.
The connecting system of soft and hard pipes suitable for high pressure according to claim 1, wherein the transition joint is provided with a concave ring groove.
The flexible and hard pipe connection system suitable for high pressure according to claim 1, wherein the material of the buckle sleeve is aluminum, stainless steel or other metals, and one end of the buckle sleeve is convex inward, and this part is embedded in the transition during crimping. Concave ring groove in the joint.
The flexible and hard pipe connection system suitable for high pressure according to claim 15, wherein the inner surface of the aluminum buckle sleeve is a flat structure.
The flexible and hard pipe connection system suitable for high pressure according to claim 15, characterized in that the inner surface of stainless steel or other metal is provided with a ring-shaped convex structure.
According to claim 1 or 15 or 16 or 17, a flexible and hard pipe connection system suitable for high pressure, wherein the buckle sleeve is radially applied to the buckle sleeve through a mold on the crimping machine, and the buckle sleeve is compressed The outer diameter of the sleeve reaches the extrusion transition joint to realize the riveting connection of the transition joint with the core tube and the buckle sleeve, and achieves the effect of sealing and anti-pull-off.
The flexible and hard pipe connection system suitable for high pressure according to claim 18, characterized in that the die on the crimping machine is squeezed integrally or locally along the outer wall of the buckle sleeve.