High-pressure hose

Abstract

The utility model discloses a high-pressure hose which comprises a core rod, a high-pressure composite pipe and a sleeve. The high-pressure composite pipe is provided with an inner contact layer, a first reinforcing layer, a flame-retardant sliding and twisting layer, a sliding and twisting fracture-resistant layer, an anti-pulling reinforcing layer and a weather-proof layer. The core rod can be connected to the inner wall of an inner contact layer of a pipe opening section of the high-pressure composite pipe in a sleeving mode. According to the first reinforcing layer, aramid fiber cloth and the inner contact layer form a high-strength resin pipe, the anti-pull-off reinforcing layer is wound outside the sliding and twisting anti-folding layer, the anti-pull-off reinforcing layer and the sliding and twisting anti-folding layer form an anti-pull-off flexible body, and sliding and twisting binding force exists between the flexible body and the resin pipe. The viscous force flexibly pulls the resin tube for a long distance, so that the resin tube is kept on the outer side of the core rod; the sleeve is buckled outside the high-pressure composite pipe and can be fixed with the core rod; the outer portion of the sleeve is provided with a plurality of special buckling deformation relieving grooves, deformation enhancing buckling bosses, inner protruding teeth and containing grooves, the protruding teeth in the sleeve can directly make contact with the anti-pull-off enhancing layer after buckling, and therefore the high-pressure pull-off resistance of the resin pipe is achieved.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of engineering machinery, and particularly relates to a high-pressure hose. BACKGROUND

[0002] No matter whether the valve core of the on-off valve in the digital hydraulic system is a valve core rotated by a stepping motor or a valve core of a slide valve controlled by an electromagnet, the frequency of the on-off valve is usually not more than 100 Hz per minute. Taking the on-off valve frequency of 60 Hz per minute as an example, the soft hose can only work for 0.9 hours when the anti-impact frequency of the soft hose is 200,000 times per pulse. Therefore, if the equipment needs to work continuously for 500 hours, the special anti-pulsation impact high-pressure composite pipe needs to have more than 108e 6 times of anti-impact pulse frequency. Especially when applied to the digital hydraulic intelligent control system, the four-layer steel wire winding layer can solve the impact of the pressure transverse fluctuation of the pump source itself on the pipeline in the conventional hydraulic system, but the high-pressure pulsation pipeline introduces a new pressure pulsation by using the method of discrete control of high-pressure flow. If the pressure pulsation is concentrated in the steel pipe, the elastic modulus of the steel pipe is much larger than that of the hydraulic oil, so the main body of the pulse forms a forward compression rolling form of forward power. This power is beneficial and can promote the rapid movement of the high-pressure flow pulsation, but due to the limitation of the equipment space and the requirement of flexible use of the hydraulic pipeline at the movable joint, the high-pressure composite pipe form of the soft hose structure form is still used in the hydraulic system. However, if the conventional high-pressure composite pipe is used, the high-pressure composite pipe has an inner layer of rubber and a reinforcing layer of steel wire, which can make the beneficial pulsation be absorbed and consumed by the elastic inner part, resulting in energy loss. Therefore, a high-pressure hose capable of utilizing the beneficial pulsation is needed to adapt to the modern discrete high-pressure fluid transmission.

[0003] However, the high-pressure composite pipe currently used in the high-pressure composite pipe is divided into inner rubber, middle rubber and outer rubber. The reinforcing material in the middle rubber is mostly a reinforcing layer of braided steel wire or wound steel wire. The middle rubber is very thin, and the braided steel wire or wound steel wire rubs and extrudes each other. The standard requires that the pull-out force between the middle rubber and the steel wire be not less than 100 N. Therefore, the relative buffer space between the steel wire and the middle rubber is small, and stress concentration is easy to occur when the pulsation frequency increases. Although at least four layers of steel wire are wound instead of braided to relieve the stress concentration of the soft hose, the high-pressure pulsation process still causes the middle rubber and the steel wire to tear, and the middle rubber and the inner rubber to tear, resulting in leakage and failure of the inner rubber. Therefore, a new type of high-pressure composite pipe that can resist high pressure and high impact pulsation is urgently needed.

[0004] In the pipeline of high-pressure fluid transmission such as hydraulic transmission, high-pressure composite pipe joints are used for connecting pipelines. The core parts of the joint are sleeve and core rod, and the connection form of the two determines the sealing and anti-pullout performance of the high-pressure composite pipe assembly. The depth and groove spacing of the sawtooth on the inner surface of the sleeve have a direct impact on the sealing performance of the clamped joint. After clamping, the sawtooth of the sleeve directly contacts the steel wire layer of the high-pressure composite pipe, and under the action of radial pressure, the wall thickness of the high-pressure composite pipe is compressed between the sleeve and the core rod. The steel wire layer and the inner rubber layer at the end of the high-pressure composite pipe are compressed into a wave shape and enter the sawtooth groove of the sleeve, and the high-pressure composite pipe joint obtains a large anti-pullout force.

[0005] In the traditional high-pressure composite pipe joint, the sleeve, core rod and other teeth are arranged at equal intervals. After clamping, if the tooth top of the sleeve is opposite to the tooth top of the core rod, it is easy to cause the inner rubber layer to crack and the steel wire layer to break, and the joint and the pipe body are not easy to clamp tightly, and the pipe body is easy to be pulled out from the joint and the clamped part of the joint sleeve, thereby reducing the sealing and anti-pullout performance of the joint, causing leakage or even rupture at the joint, and greatly affecting the normal use of the equipment. For example, the publication number CN108916505A gives a method of arranging the teeth at equal intervals to solve the above problems, but does not detail the anti-pullout structure.

[0006] For the sealing and anti-pullout performance of the joint, the common structure is that the core rod of the joint part at both ends of the high-pressure composite pipe is provided with a sealing groove and an anti-pullout protruding ring for sealing and hooking the inner rubber of the high-pressure composite pipe. The inside of the sleeve of the joint part is provided with four annular "teeth" of the same inner diameter size which are clamped on the outside of the high-pressure composite pipe through the plastic deformation of the sleeve, and the anti-pullout is achieved through friction between the high-pressure composite pipe and the sleeve. However, when the hydraulic oil inside the high-pressure composite pipe is impacted by pulse, the "tooth" inside the last sleeve closest to the hydraulic oil inside the high-pressure composite pipe is subjected to the largest stress and strain, and is easily torn at this last "tooth", causing the subsequent "teeth" to be torn and pulled out or to leak before reaching the specified service life. The sealing groove and anti-pullout protruding ring provided on the core rod for sealing and hooking the high-pressure composite pipe easily bite the inner rubber, and stress concentration occurs at the biting position. Under the action of pulse, the inner rubber is easily torn due to the hooking of the groove, causing the inner rubber to be damaged and leading to oil leakage and failure.

[0007] Therefore, a new type of high-pressure composite pipe resistant to high pressure and high impact pulsation is urgently needed, as well as a core rod and sleeve structure of the two end joint parts of the high-pressure composite pipe, which can effectively reduce the stress concentration of the connected sleeve and the high-pressure composite pipe and reduce the stress amplitude to improve the fatigue resistance of the high-pressure pulsation impact hose, so as to obtain a high-pressure hose that meets the high-pressure pulsation flow impact problem in the digital hydraulic intelligent control system. Utility model content

[0008] The present application provides a high-pressure composite pipe resistant to high-pressure pulsation impact, a high-pressure composite pipe joint resistant to high-pressure pulsation impact, and at least one high-pressure hose that is buckled together.

[0009] The technical scheme adopted by the present application is:

[0010] A high-pressure hose includes a core rod, a high-pressure composite pipe, and a sleeve; the high-pressure composite pipe has an inner contact layer, a first reinforcing layer, a flame-retardant sliding layer, a sliding anti-bending layer, a pull-out prevention reinforcing layer, and a protective layer arranged in the radial direction from inside to outside in sequence;

[0011] The first reinforcing layer is wound on the outer side of the inner contact layer by aramid fiber cloth, and the inner contact layer and the first reinforcing layer form a high-strength resin pipe; the inner contact layer is configured as a hard and smooth nylon layer, so that the friction loss of the pulsating flow in the longitudinal direction of the high-pressure composite pipe is reduced; at the same time, the thickness of the nylon layer is set to ensure that the pulsating radial expansion energy flowing through is absorbed and then fed back to the pulsating flow group through the rebounding force of the hard wall to form a longitudinal pulsation auxiliary driving force, so that a quasi-rigid fluid space smooth channel is formed inside the inner contact layer; the pull-out prevention reinforcing layer is made of carbon fiber cloth and is wound on the outer side of the sliding anti-bending layer, and the adhesion between the sliding anti-bending layer and the resin pipe ensures that the resin pipe is reinforced by the pull-out prevention reinforcing layer on the outer side of the core rod to improve the pull-out resistance between the resin pipe and the core rod;

[0012] The core rod can be sleeved on the inner wall of the pipe opening segment of the high-pressure composite pipe, the outer circumferential contact surface of the insertion segment of the core rod sleeved on the inner wall of the pipe opening segment of the high-pressure composite pipe is smooth without protrusions, and the contact surfaces are bonded by a bonding agent; a limiting ring, a connecting ring, a first glue containing groove, and a second glue containing groove are distributed along the axis direction of the core rod; the connecting ring has a hooking connection surface on the side facing the limiting ring; the connecting ring has a positioning working surface for limiting the end face of the high-pressure composite pipe on the side facing the high-pressure composite pipe; and a buckling groove is formed between the hooking connection surface of the limiting ring and the connecting ring;

[0013] The sleeve has a plurality of slow buckling deformation grooves, and the slow buckling deformation grooves are provided with a plurality of glue holes penetrating through the sleeve along the circumference of the sleeve, so that the cured glue forms a soft nail when subjected to high-pressure pulse pulling; the slow buckling deformation grooves enable the sleeve to accommodate a larger volume of the wave protrusions of the high-pressure composite pipe after buckling, thereby enhancing the hooking capacity and energy of the high-pressure composite pipe in the sleeve; the sleeve further comprises a first enhanced deformation buckling boss, which ensures the buckling strength of the first compression ring and the buckling groove, and enhances the buckling strength of the second compression ring and the high-pressure composite pipe; and a second, third and fourth enhanced deformation buckling boss, which enhances the engagement strength of the internal teeth of the sleeve and the rubber pipe; and a fifth enhanced deformation buckling boss, which enhances the engagement strength of the sleeve tail end cover and the rubber pipe to prevent rainwater from entering;

[0014] The sleeve is buckled to the outside of the anti-waiting layer or the anti-pulling enhancement layer of the high-pressure composite pipe and can be fixed with the core rod; the sleeve comprises a first compression ring, a second compression ring and a first connecting groove between the first compression ring and the second compression ring; the second compression ring has a limiting inclined surface for limiting towards the first compression ring; after buckling, the first compression ring of the sleeve enters the connecting ring of the core rod, so that the core rod and the sleeve are rigidly hooked together;

[0015] The internal teeth of the sleeve gradually shrink in height, and the tooth spacing increases by equal or unequal distances, and the spacing between the slow buckling deformation grooves does not correspond to equal spacing, so that the compression deformation amount of the internal teeth is not equal due to the unequal compression deformation amount of the slow buckling deformation grooves, so that the high-pressure composite pipe forms a transition from shallow engagement to deep engagement between the teeth and the width of the engagement mark of each tooth increases; after buckling, the internal teeth of the sleeve, the accommodating groove and the high-pressure composite pipe are in contact, under the action of radial pressure, the wall thickness of the high-pressure composite pipe is compressed between the sleeve and the core rod, and the end of the high-pressure composite pipe is compressed into a wave shape into the groove between the teeth of the sleeve, or the second compression ring and the third compression ring of the sleeve are respectively buckled with the first glue accommodating groove and the second glue accommodating groove, and the mouth end of the high-pressure composite pipe is compressed into a wave shape into the first glue accommodating groove and the second glue accommodating groove.

[0016] The high-pressure hose of the present application further has the following additional technical features:

[0017] The inner side of the sleeve has a plurality of convex teeth protruding towards the inside of the sleeve in the axial direction, the two ends of the convex teeth in the axial direction are inclined to the inner wall of the sleeve to enhance the contact area of the high-pressure composite pipe after being buckled and engaged into the sleeve, thereby enhancing the frictional force against pulling.

[0018] The connecting ring has a positioning working surface perpendicular to the axis of the core rod on the side of the high-pressure composite pipe in the axial direction of the core rod, which is used for limiting the end face of the high-pressure composite pipe when the core rod coated with glue is inserted into the high-pressure composite pipe; the first glue containing groove and the second glue containing groove distributed in the axial direction of the core rod contain the excess glue when the core rod coated with glue is inserted into the high-pressure composite pipe, and after the sleeve is pressed, the first glue containing groove and the second glue containing groove are located in the corresponding buckle position of the second pressing ring and the third pressing ring protruding from the inner wall of the sleeve on the side of the first pressing ring towards the high-pressure composite pipe, the positioning reference of the corresponding buckle position is the hooking connection surface of the connecting ring and the first pressing ring on the sleeve, which is used for positioning the center position of the first glue containing groove and the second glue containing groove of the core rod, and positioning the center position of the second pressing ring and the third pressing ring of the sleeve.

[0019] The limiting ring is a metal limiting ring; the side of the limiting ring towards the buckle groove has a limiting inclined surface, which is used for ensuring that the first pressing ring completely slides into the buckle groove when the sleeve is buckled and deformed, so that the first pressing ring is in contact with the hooking connection surface.

[0020] The second pressing ring corresponds to the first glue containing groove, and the third pressing ring corresponds to the second glue containing groove, which is used for bending the mouth end of the high-pressure composite pipe after buckling, for sealing and resisting the pulling out between the high-pressure composite pipe and the core rod.

[0021] The length value of the arc length of the inner arc surface from the first glue containing groove to the second glue containing groove of the core rod gradually decreases, so that the stress change of the inner contact layer with higher hardness of the resin pipe in the recess has a transition, and the strain change is not abrupt, thereby having a structure form for eliminating stress concentration.

[0022] The core rod comprises a head, a middle part and a tail part connected with each other; the head has a limiting ring protruding in the radial direction of the core rod on the outer side; the middle part has a plurality of connecting rings distributed in the axial direction of the core rod and protruding from the circumferential surface of the core rod on the outer side; and the tail part has a first transition angle formed between the tangent plane of the circumference of the core rod and the axial direction of the core rod.

[0023] The first transition angle ranges from 6° to 10°, and the length of the first transition angle in the extension direction of the core rod is 10 mm.

[0024] The sleeve tail end is covered by a cover sleeve for contacting the rainproof layer after buckling to prevent the infiltration of rainwater and the like, and the cover sleeve limits the damage caused by the hard bite of the sleeve directly to the rainproof layer due to the excessive bending of the high-pressure composite pipe.

[0025] The rainproof layer is connected to the slide-and-wind anti-bending layer outside by winding the carbon fiber cloth, the rainproof layer is formed outside the rainproof layer, and the sleeve has at least one second pressing ring pressed on the rainproof layer or the rainproof layer, which ensures that the slide-and-wind anti-bending layer in the high-pressure composite pipe is compressed and limited in the pre-pressing slide-and-wind space between the limiting inclined surface of the second pressing ring of the sleeve and the positioning working surface after the sleeve is pressed, and ensures that the carbon fiber cloth is not pulled out.

[0026] Thanks to the above technical solutions, the application has the following beneficial effects:

[0027] 1. A high pressure hose comprising a core rod, a high pressure composite tube and a sleeve; the high pressure composite tube has an inner contact layer, a first reinforcing layer, a fireproofing and sliding layer, a sliding and folding resistant layer, a pull-out resistant reinforcing layer and a protective layer arranged in turn from inside to outside in the radial direction; the first reinforcing layer is wound outside the inner contact layer by aramid fiber cloth which has a strength comparable to that of steel wire, the inner contact layer and the first reinforcing layer form a high-strength resin tube, and the inner contact layer is configured as a hard and smooth nylon layer: so that the friction loss of the pulsating flow in the longitudinal direction of the high pressure composite tube is reduced; at the same time, the thickness of the nylon layer is set to ensure that the pulsating radial expansion energy flowing through is absorbed and then fed back to the pulsating flow group through the elastic force of the hard wall in time to form a longitudinal pulsating auxiliary driving force, so that a quasi-rigid fluid space smooth channel is formed inside the inner contact layer, thereby effectively reducing the stress amplitude of high pressure pulsating impact and overcoming the problem of absorption of beneficial pulsating energy by the inner rubber layer of the conventional high pressure composite tube; at the same time, the longitudinal bonding force between the sliding and folding resistant layer and the high-strength resin tube increases with the increase of length, and the pull-out resistant reinforcing layer is connected outside the sliding and folding resistant layer by winding a carbon fiber cloth which is brittle but has higher strength, and then the high pressure composite tube overcomes the problem of insufficient high pressure pull-out resistance of the conventional resin tube by the rigid clamping of the pull-out resistant reinforcing layer by the sleeve.

[0028] 2. As a preferred embodiment of the present application, the core rod can be sleeved on the inner wall of the high pressure composite tube port section, the outer circumferential surface of the core rod inserted into the inner wall of the high pressure composite tube port section is in contact with smoothness, and an adhesive is used for bonding transition, thereby enhancing the bonding strength and sealing effect of the high pressure composite tube and the core rod.

[0029] 3. As a preferred embodiment of the present application, the internal teeth of the sleeve gradually shrink, and the tooth spacing is increased by 1 / 2 times, so that the compression deformation of the internal teeth is less than that of the corresponding external grooves, so that the high pressure composite tube forms a transition from small occlusion to large occlusion; a plurality of glue flow holes penetrating the sleeve are arranged in the grooves along the circumferential direction of the sleeve, so that the cured glue forms a soft nail when subjected to high pressure pulse pull-out. These structural measures can obtain a high pressure composite tube joint which is matched with the high pressure composite tube and resistant to high pressure pulsating impact.

[0030] 4. As a preferred embodiment of the present application, the core rod has the limiting ring, the connecting ring, the clamping groove formed between the limiting ring and the connecting ring distributed along the axial direction of the core rod; the sleeve includes the first pressing ring, the second pressing ring, and the first connecting groove between the first pressing ring and the second pressing ring; the sleeve is buckled to the outside of the anti-waiting layer or the anti-pulling-out reinforcing layer of the high-pressure composite pipe and can be fixed with the core rod; the sleeve further includes the first reinforcing deformation clamping convex platform, the second reinforcing deformation clamping convex platform, the third reinforcing deformation clamping convex platform, and the fourth reinforcing deformation clamping convex platform, which enhance the clamping strength of the teeth and the rubber tube, the clamping strength of the first pressing ring and the high-pressure composite pipe, and the clamping strength of the second pressing ring and the high-pressure composite pipe; the fifth reinforcing deformation clamping convex platform provides the strongest clamping force in the subsequent teeth, ensures that the farthest sleeve inside the high-pressure composite pipe has the largest stress and strain under the hydraulic oil pulse impact inside the high-pressure composite pipe, and provides a decisive anti-pulling-out clamping structure.

[0031] After clamping, the first pressing ring of the sleeve enters the connecting ring of the core rod, thereby ensuring the rigid hooking connection of the core rod and the sleeve and the high-pressure pulsation anti-pulling-out property of the core rod and the sleeve. In addition, the first glue-containing groove and the second glue-containing groove distributed along the axial direction of the core rod are buckled to the second pressing ring and the third pressing ring of the sleeve outside the high-pressure composite pipe, which correspond to the first glue-containing groove and the second glue-containing groove, respectively, are used to bend and deform the mouth end of the high-pressure composite pipe after clamping, and are used to seal and resist the pulling-out problem between the high-pressure composite pipe and the core rod under high-pressure pulsation impact.

[0032] 5. As a preferred embodiment of the present application, the sleeve further includes a plurality of clamping deformation grooves and a plurality of internal teeth, the sleeve is buckled to the outside of the anti-waiting layer or the anti-pulling-out reinforcing layer of the high-pressure composite pipe and can be fixed with the core rod; the sleeve includes the first pressing ring, the second pressing ring, and the first connecting groove between the first pressing ring and the second pressing ring; the second pressing ring has a limiting inclined surface for limiting towards the first pressing ring; after clamping, the first pressing ring of the sleeve enters the connecting ring of the core rod, so that the core rod and the sleeve are rigidly hooked and connected.

[0033] The sleeve interior convex tooth height gradually contracts, and the convex tooth spacing increases by equal or unequal intervals, which does not correspond to the equal spacing between the slow buckling deformation grooves, so that the compression deformation amount of the interior convex teeth is not equal due to the unequal buckling contraction deformation amount of the slow buckling deformation grooves, so that the convex tooth interval of the high-pressure composite pipe forms a transition from shallow occlusion to deep occlusion and the width of the occlusion mark of each convex tooth increases from small to large; After buckling, the interior convex teeth and the grooves between the convex teeth of the sleeve directly contact the high-pressure composite pipe, and under the action of radial pressure, the wall thickness of the high-pressure composite pipe is compressed between the sleeve and the core rod, and the end of the high-pressure composite pipe is compressed into a wave shape into the groove between the convex teeth of the sleeve, or the second compression ring and the third compression ring of the sleeve are buckled with the first glue containing groove and the second glue containing groove respectively, and the mouth end of the high-pressure composite pipe is compressed into a wave shape into the first glue containing groove and the second glue containing groove, and the longitudinal bonding force between the sliding and rubbing anti-bending layer and the high-strength resin pipe increases with the increase of length, thereby overcoming the problem of insufficient high-pressure tensile resistance of conventional resin pipes due to their smoothness. The problem of pulling out of the high-pressure hose under high-pressure pulsating impact is solved. BRIEF DESCRIPTION OF DRAWINGS

[0034] The drawings described herein are used to provide further understanding of the present application, and form a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application, and do not constitute an improper limitation on the present application. In the drawings:

[0035] Figure 1 A structure diagram of a bending-resistant and fatigue-resistant hose according to an embodiment of the present application;

[0036] Figure 2 A structure diagram of a joint core of a bending-resistant and fatigue-resistant hose according to an embodiment of the present application;

[0037] Figure 3 A structure diagram of a sleeve of a bending-resistant and fatigue-resistant hose according to an embodiment of the present application;

[0038] Figure 4 An internal structure diagram of a sleeve and a joint core of a bending-resistant and fatigue-resistant hose before buckling according to an embodiment of the present application;

[0039] Figure 5 An internal structure diagram of a rubber tube of a bending-resistant and fatigue-resistant hose according to an embodiment of the present application;

[0040] In the drawings,

[0041] 1, core rod; 2, high-pressure composite pipe; 3, sleeve; 4, limiting ring; 5, connecting ring; 6, first glue containing groove; 7, second glue containing groove; 8, limiting inclined surface; 9, positioning working surface; 10, first connecting groove; 11, protruding tooth; 12, first pressing ring; 13, second pressing ring; 14, buckling groove; 15, third pressing ring; 16, first protruding tooth; 17, second protruding tooth; 18, third protruding tooth; 19, limiting inclined surface; 20, hooking connecting surface; 21, inner contact layer; 22, first reinforcing layer; 23, flame-retardant sliding and rubbing layer; 24, sliding and rubbing breakage-resistant layer; 25, anti-pulling-out reinforcing layer; 26, anti-waiting layer; 27, deformation groove for slowing down buckling; 28, glue flow hole; 29, containing groove; 30, first reinforcing deformation buckling boss; 31, second reinforcing deformation buckling boss; 32, third reinforcing deformation buckling boss; 33, fourth reinforcing deformation buckling boss;

[0042] R1-transition slow-down inclination angle; DETAILED DESCRIPTION

[0043] In order to more clearly illustrate the overall concept of the present application, the following will be described in detail with reference to the accompanying drawings.

[0044] In the following description, many specific details are set forth in order to provide a thorough understanding of the present application, however, the present application can also be practiced in other ways different from those described herein, therefore, the scope of protection of the present application is not limited by the specific embodiments disclosed below.

[0045] In addition, in the description of the present application, it should be understood that the terms "top", "bottom", "inner", "outer", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0046] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection", "fixing" and the like should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected, or it can be communicated; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication or interaction relationship between two elements. For those skilled in the art, the specific meaning of the above-mentioned terms in the present application can be understood according to the specific circumstances.

[0047] In the present application, unless otherwise explicitly specified and limited, the first feature is "on" or "under" the second feature, which can be direct contact between the first and second features, or indirect contact through an intermediate medium. In the description of the present specification, the description of the terms "embodiment", "example", "one embodiment", "exemplary" or "specific example" means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0048] A high-pressure hose, as shown, comprises a core rod 1, a high-pressure composite tube 2 and a sleeve 3; the high-pressure composite tube 2 has an inner contact layer 21, a first reinforcing layer 22, a flame-retardant sliding layer 23, a sliding anti-buckling layer 24, a pull-out prevention reinforcing layer 25 and a protective layer 26 arranged in sequence from inside to outside in the radial direction. Figures 1-5

[0049] Wherein, the first reinforcing layer 22 is wound outside the inner contact layer 21 by aramid fiber cloth which has strength comparable to steel wire, and the inner contact layer 21 and the first reinforcing layer 22 form a high-strength resin tube; the inner contact layer 21 is configured as a hard and smooth nylon layer: so that the friction loss of the pulsating flow in the longitudinal direction of the high-pressure composite tube 2 is reduced; at the same time, the thickness of the nylon layer is set to ensure that the pulsating radial expansion energy flowing through is absorbed and then fed back to the pulsating flow group through the elastic force of the hard wall in time to form a longitudinal pulsating auxiliary driving force, so that a quasi-rigid fluid space smooth channel is formed inside the inner contact layer 21, thereby effectively reducing the stress amplitude of high-pressure pulsating impact and overcoming the problem of absorption of beneficial pulsating energy by the inner rubber layer of the conventional high-pressure composite tube 2; at the same time, the longitudinal bonding force between the sliding anti-buckling layer 24 and the high-strength resin tube increases with the increase of length, and the pull-out prevention reinforcing layer 25 is connected outside the sliding anti-buckling layer 24 by winding a carbon fiber cloth which is brittle but has higher strength, and then the pull-out prevention reinforcing layer 25 is rigidly clamped by the sleeve 3, so that the high-pressure composite tube 2 overcomes the problem of insufficient high-pressure pull-out resistance of the conventional resin tube which is smooth;

[0050] ​The core rod 1 can be sleeved on the inner wall of the pipe mouth section of the high-pressure composite pipe 2. The outer circumferential surface of the insertion core rod 1 section of the core rod 1 sleeved on the inner wall of the pipe mouth section of the high-pressure composite pipe 2 is smooth and free of bosses. The contact surface is bonded by adhesive, thereby enhancing the bonding strength and sealing effect of the high-pressure composite pipe 2 and the core rod 1. The first adhesive groove 6, the second adhesive groove 7, the limiting ring 4 and the connecting ring 5 are distributed along the axial direction of the core rod 1. The connecting ring 5 has a hooking connection surface 20 on the side facing the limiting ring 4. The connecting ring 5 has a positioning working surface 9 on the side facing the high-pressure composite pipe 2 for limiting the end surface of the high-pressure composite pipe 2. The hooking connection surface 20 between the limiting ring 4 and the connecting ring 5 forms a buckling groove 14.

[0051] The sleeve 3 is buckled on the outside of the anticorrosion layer 26 or the anti-pulling-out reinforcing layer 25 of the high-pressure composite pipe 2 and can be fixed with the core rod 1. The sleeve 3 includes the first compression ring 12, the second compression ring 13 and the first connecting groove 10 between the first compression ring 12 and the second compression ring 13. The second compression ring 13 has a limiting inclined surface 19 for limiting on the side facing the first compression ring 12. After buckling, the first compression ring 12 of the sleeve 3 enters the connecting ring 5 of the core rod 1, so that the core rod 1 and the sleeve 3 are rigidly hooked and connected.

[0052] Further, the sleeve 3 has a plurality of slow buckling deformation grooves 27, the slow buckling deformation grooves 27 are provided with a plurality of glue flow holes 28 penetrating the sleeve 3 along the circumference of the sleeve 3, so that the cured glue forms a soft nail when subjected to high pressure pulse pulling; the slow buckling deformation grooves 27 enable the sleeve 3 to accommodate larger volume of high pressure composite pipe 2 after buckling, so as to enhance the hooking capacity and energy of the high pressure composite pipe 2 in the sleeve 3; the sleeve 3 further comprises a first enhanced deformation buckling boss 30, which enhances the buckling strength of the first pressing ring 12 and the buckling groove 14, and enhances the buckling strength of the second pressing ring 13 and the high pressure composite pipe 2; and a second enhanced deformation buckling boss 31, a third enhanced deformation buckling boss 32 and a fourth enhanced deformation buckling boss 33, which enhance the engagement strength of the internal teeth 11 of the sleeve 3 and the rubber pipe; and a fifth enhanced deformation buckling boss, which enhances the engagement strength of the covering sleeve at the tail end of the sleeve 3 and the rubber pipe, so as to prevent rainwater from entering; the strongest buckling force is provided in the subsequent teeth 11, which ensures that the internal "teeth" of the sleeve 3 farthest from the hydraulic oil liquid inside the high pressure composite pipe 2 is subjected to the largest stress and strain when the hydraulic oil liquid inside the high pressure composite pipe 2 is subjected to hydraulic oil liquid pulse impact, providing a decisive anti-pulling buckling structure; after buckling, the first pressing ring 12 of the sleeve 3 enters the connecting ring 5 of the core rod 1, thereby ensuring the rigid hooking connection of the core rod 1 and the sleeve 3, and thereby ensuring the high pressure pulsation anti-pulling property of the core rod 1 and the sleeve 3; in addition, the first glue containing groove 6 and the second glue containing groove 7 distributed along the axis direction of the core rod 1, the second pressing ring 13 and the third pressing ring 15 of the sleeve 3 outside the high pressure composite pipe 2 correspond to the first glue containing groove 6 and the second glue containing groove 7 respectively, for bending and deforming the mouth end of the high pressure composite pipe 2 after buckling, for sealing and resisting the pulling off problem between the high pressure composite pipe 2 and the core rod 1 under high pressure pulsation impact.

[0053] Further, the internal teeth 11 of the sleeve 3 gradually shrink in height, and the distance between the teeth 11 increases by equal or unequal distance, which does not correspond to the equal distance between the slow buckling deformation grooves 27, so that the compression deformation amount of the internal teeth 11 is not equal due to the unequal distance between the slow buckling deformation grooves 27, so that the engagement of the teeth 11 of the high pressure composite pipe 2 gradually transitions from shallow to deep, and the width of the engagement mark of each tooth 11 gradually transitions from small to large; after buckling, the internal teeth 11 of the sleeve 3, the containing groove 29 and the high pressure composite pipe 2 are in contact, under the action of radial pressure, the wall thickness of the high pressure composite pipe 2 is compressed between the sleeve 3 and the core rod 1, the end of the high pressure composite pipe 2 is pressed into a wave shape into the groove between the teeth 11 of the sleeve 3, or the second pressing ring 13 and the third pressing ring 15 of the sleeve 3 outside the high pressure composite pipe 2 correspond to the first glue containing groove 6 and the second glue containing groove 7 respectively after buckling, the mouth end of the high pressure composite pipe 2 is pressed into a wave shape into the first glue containing groove 6 and the second glue containing groove 7.

[0054] The present application sets the tooth height of the internal teeth 11 of the sleeve 3 to gradually shrink, and the spacing between the teeth 11 is increased by 1 / 2 times, so that the compression deformation of the internal teeth 11 is smaller than that of the corresponding external grooves, so that the high-pressure composite pipe 2 forms a transition from small occlusion to large occlusion; and a plurality of glue holes 28 are provided in the sleeve 3 along the circumferential direction of the sleeve 3, so that the cured glue forms a soft nail when subjected to high-pressure pulse drawing. These structural measures can obtain a high-pressure composite pipe 2 joint that can withstand high-pressure pulsating impact and is matched with the high-pressure composite pipe 2.

[0055] It should be noted that the plurality of teeth 11 are distributed at unequal heights but equal w widths along the axial direction of the sleeve 3 at intervals of w, 1.5w, 2w; or the teeth 11 are distributed in a threaded manner, and the height of the plurality of teeth 11 from the front end of the sleeve 3 to the end of the sleeve 3 on one side of the sleeve 3 axis gradually decreases.

[0056] As a preferred embodiment, the inner side of the sleeve 3 has a plurality of teeth 11 protruding towards the inner side of the sleeve 3 along the axial direction, and the two ends of the teeth 11 along the axial direction are inclined to the inner wall of the sleeve 3 to enhance the contact area between the high-pressure composite pipe and the sleeve after the wave-shaped high-pressure composite pipe enters the sleeve after being clamped, thereby enhancing the friction force against pulling; wherein the first tooth adjacent to the first compression ring 12 of the sleeve 3 is the second compression ring 13, and the second compression ring 13 has an inclined chamfer larger than 45° inclined to the inner wall of the sleeve along the axial direction towards one end of the first compression ring 12 for the guiding function surface of the core rod 1 during clamping.

[0057] As a preferred embodiment, the connecting ring 5 has a positioning working surface 9 perpendicular to the axis of the core rod 1 on the side of the high-pressure composite pipe 2 along the axial direction of the core rod 1 for limiting the end face of the high-pressure composite pipe 2 when the glued core rod 1 is inserted into the high-pressure composite pipe 2; the first glue containing groove 6 and the second glue containing groove 7 distributed along the axial direction of the core rod 1 contain the excess glue when the glued core rod 1 is inserted into the high-pressure composite pipe 2; and after the sleeve 3 is compressed, the first glue containing groove 6 and the second glue containing groove 7 correspond to the clamping position of the second compression ring 13 and the third compression ring 15 protruding from the inner wall of the sleeve 3 on the side of the first compression ring 12 towards the high-pressure composite pipe 2, and the positioning reference of the clamping position corresponds to the hooking connection surface 20 of the connecting ring 5 and the first compression ring 12 on the sleeve 3 hooked together, which is used to position the center positions of the first glue containing groove 6 and the second glue containing groove 7 of the core rod 1, and the center positions of the second compression ring 13 and the third compression ring 15 of the sleeve 3.

[0058] As a preferred embodiment, the limiting ring 4 is a metal limiting ring; the side of the limiting ring 4 facing the buckling groove 14 has a limiting slope 8, which is used to ensure that the first pressing ring 12 completely slides into the buckling groove 14 when the sleeve 3 is buckled and deformed, so that the first pressing ring 12 is in contact with the hooking connection surface 20.

[0059] The limiting ring 4 is a metal limiting ring or a plastic limiting ring; when the limiting ring 4 is a metal limiting ring, the side of the limiting ring 4 facing the buckling groove 14 has a limiting slope 8, which is used to ensure that the first pressing ring 12 completely slides into the buckling groove 14 when the sleeve 3 is buckled and deformed, so that the first pressing ring 12 is in contact with the hooking connection surface 20; when the limiting ring 4 is a plastic limiting ring, the side of the second pressing ring 13 of the sleeve 3 facing the first pressing ring 12 has a limiting inclined slope 19 for limiting, which is used to force the connecting ring 5 to slide to the first connecting groove 10 between the first pressing ring 12 and the second pressing ring 13 under the action of the limiting inclined slope 19 when the sleeve 3 is buckled and deformed.

[0060] The sleeve 3 also has a third pressing ring 15, a first protruding tooth 16, a second protruding tooth 17, and a third protruding tooth 18, the spacing of the third pressing ring 15, the first protruding tooth 16, and the second protruding tooth 17 and the third protruding tooth 18 gradually changes, and the spacing of the glue outside grooves of the sleeve 3 is uniform, so that the buckled third pressing ring 15, the first protruding tooth 16, the second protruding tooth 17, and the third protruding tooth 18 gradually decrease in deformation amount and gradually increase in deformation width, which is beneficial to the rotation of the high-strength carbon fiber cloth and the opening of the space, so as to prevent brittle fracture of the liquid flow pulse, thereby having the function of resisting high-pressure pulse and preventing brittle tearing of the high-strength carbon fiber cloth or stress concentration of the inner contact layer 21 in the first reinforcing layer 22 due to the buckling force mainly concentrated on the third protruding tooth 18, thereby causing leakage.

[0061] As a preferred embodiment, the second pressing ring 13 corresponds to the first glue containing groove 6; the third pressing ring 15 corresponds to the second glue containing groove 7, which is used to bend and deform the mouth end of the high-pressure composite pipe 2 after buckling, for sealing and resisting the pulling out between the high-pressure composite pipe 2 and the core rod 1.

[0062] The second pressing ring 13 corresponds to the first glue groove 6; the third pressing ring 15 corresponds to the second glue groove 7 to achieve the buckling connection of the high-pressure composite pipe 2 located inside the sleeve 3, so that the high-pressure composite pipe 2 can be elastically deformed under the extrusion of the sleeve 3, so that the two sides at the buckling position are bent and deformed inward, thereby further enhancing the tight connection between the sleeve 3 and the high-pressure composite pipe 2, preventing the sleeve 3 from slipping off the outside of the high-pressure composite pipe 2, thereby further enhancing the anti-pulling performance between the high-pressure composite pipe 2 inside the sleeve 3 and the joint core, and avoiding tearing at the position of the third protrusion 18 on the right end of the sleeve 3, which causes the second protrusion 17 and the high-pressure composite pipe 2 to tear and pull off or leak before reaching the specified service life.

[0063] As a preferred embodiment, the length of the arc length of the inner arc surface of the first glue groove 6 to the second glue groove 7 of the core rod 1 gradually decreases, so that the stress change of the inner contact layer 21 of the resin pipe with higher hardness at the concave position has a transition, and the strain change does not suddenly change, thereby having a stress concentration eliminating structure form.

[0064] Specifically, the length between the first glue groove 6 and the second glue groove 7 of the core rod 1 is not greater than the radius of the inner arc surface of the smallest glue groove, and the length of the arc length of each glue groove gradually decreases, so that the stress change of the inner contact layer 21 of the resin pipe with higher hardness at the concave position is continuous, and the strain does not suddenly change, thereby having a transition structure of eliminating stress concentration. For example: the radius of the first accommodating groove is 2-3 mm; the radius of the second accommodating groove is 1-1.5 mm.

[0065] As a preferred embodiment, the core rod 1 comprises a head, a middle part and a tail connected to each other; the outer side of the head has a limiting ring 4 protruding in the radial direction of the core rod 1; the outer side of the middle part has a plurality of connection rings 5 distributed in the axial direction of the core rod 1 and protruding from the circumference of the core rod 1; and the tail has a first transition angle formed between the circumferential section of the core rod 1 and the axial direction of the core rod 1. Specifically, the angle range of the first transition angle is 6°-10°, and the length of the first transition angle in the extension direction of the core rod 1 is 10 mm.

[0066] As a preferred embodiment, the angle range of the transition and slow-down angle is 1°-10°.

[0067] The transition is added to slow down the inclination angle, so that the core rod 1 avoids damaging the high-pressure composite pipe 2 during the process of inserting the high-pressure composite pipe 2 or forming a sleeve joint with the core rod 1, and is beneficial to installation and ensures the coaxiality between the high-pressure composite pipe 2 and the core rod 1. On the other hand, the connection between the high-pressure composite pipe 2 and the core rod 1 can form a pre-pressing transition space, so that the high-pressure composite pipe 2 and the core rod 1 have a transition deformation space for resisting bending deformation, which is used for buffering the impact of pulsation and preventing leakage. The high-pressure composite pipe 2 is a composite rubber pipe with an arterial blood vessel structure.

[0068] The sleeve 3 tail end is covered by a sleeve, which is used to contact the anti-weather layer 26 after buckling to prevent the infiltration of rainwater and the like, and has a function of limiting the damage of the sleeve 3 directly engaging with the anti-pulling-out reinforcing layer 25 caused by excessive bending of the high-pressure composite pipe 2.

[0069] As a preferred embodiment, the anti-pulling-out reinforcing layer 25 is connected to the outside of the sliding and rubbing anti-bending layer 24 by winding a carbon fiber cloth, the anti-weather layer 26 is formed on the outside of the anti-pulling-out reinforcing layer 25, and the sleeve 3 has at least one second compression ring 13 pressed on the anti-pulling-out reinforcing layer 25 or the anti-weather layer 26, which ensures that the sliding and rubbing anti-bending layer 24 in the high-pressure composite pipe 2 is compressed and limited in the pre-pressing sliding and rubbing space between the limiting inclined surface 19 of the second compression ring 13 of the sleeve 3 and the positioning working surface 9 after the sleeve 3 is compressed, and ensures that the carbon fiber cloth is not pulled out.

[0070] The places not mentioned in the application can be realized by using or referring to the existing technology.

[0071] Each of the embodiments in the specification is described in a progressive manner, and the same and similar parts between the embodiments can be referred to each other. Each embodiment mainly explains the difference from other embodiments.

[0072] The above is only an embodiment of the application and is not used to limit the application. Those skilled in the art can make various changes and modifications to the application. Any modification, equivalent replacement, improvement, etc. within the spirit and principles of the application shall be included in the scope of the claims of the application. The places not mentioned in the application can be realized by using or referring to the existing technology.

[0073] Each of the embodiments in the specification is described in a progressive manner, and the same and similar parts between the embodiments can be referred to each other. Each embodiment mainly explains the difference from other embodiments.

[0074] The above is only an embodiment of the application and is not used to limit the application. Those skilled in the art can make various changes and modifications to the application. Any modification, equivalent replacement, improvement, etc. within the spirit and principles of the application shall be included in the scope of the claims of the application. The places not mentioned in the application can be realized by using or referring to the existing technology.

Claims

1. A high pressure hose, characterized in that It comprises a core rod (1), a high-pressure composite pipe (2) and a sleeve (3); the high-pressure composite pipe (2) has, from inside to outside along the radial direction, an inner contact layer (21), a first reinforcing layer (22), a flame-retardant sliding layer (23), a sliding anti-bending layer (24), a pull-out prevention reinforcing layer (25) and a protection layer (26); The first reinforcing layer is wound on the outer side of the inner contact layer by aramid fiber cloth, the inner contact layer and the first reinforcing layer form a high-strength resin pipe, and the inner contact layer is configured as a hard and smooth nylon layer: so that the friction loss of the pulsating flow along the longitudinal direction of the high-pressure composite pipe is reduced; at the same time, the thickness of the nylon layer is set to ensure that the pulsating radial expansion energy flowing through is absorbed and then fed back to the pulsating flow group through the rebounding force of the hard wall to form a longitudinal pulsating auxiliary driving force, so that a quasi-rigid fluid space smooth channel is formed inside the inner contact layer; The pull-out prevention reinforcing layer is made of carbon fiber cloth and is wound on the outer side of the sliding anti-bending layer, and the adhesion between the sliding anti-bending layer and the resin pipe ensures the pull-out prevention between the resin pipe on the outer side of the core rod (1) and the core rod (1); The core rod (1) can be sleeved on the inner wall of the pipe mouth section of the high-pressure composite pipe (2), the outer circumferential contact surface of the insertion section of the core rod (1) sleeved on the inner wall of the pipe mouth section of the high-pressure composite pipe (2) is smooth without protrusions, and the contact surfaces are bonded by adhesive; along the axial direction of the core rod (1), a limiting ring (4), a connecting ring (5), a first glue containing groove (6) and a second glue containing groove (7) are distributed; the connecting ring (5) has a hooking connecting surface (20) on the side facing the limiting ring (4); the connecting ring (5) has a positioning working surface (9) for limiting the end face of the high-pressure composite pipe (2) on the side facing the high-pressure composite pipe (2); the limiting ring (4) and the hooking connecting surface (20) of the connecting ring (5) form a buckling groove (14); The sleeve has a plurality of slow buckling deformation grooves, and the slow buckling deformation grooves are provided with a plurality of glue flow holes penetrating through the sleeve along the circumferential direction of the sleeve, so that the cured glue flow forms soft nails when subjected to high-pressure pulse pulling; the slow buckling deformation grooves enable the sleeve to accommodate a larger volume of the wave protrusions of the high-pressure composite pipe (2) after buckling, so as to enhance the hooking capacity and hooking energy of the high-pressure composite pipe (2) in the sleeve; the sleeve (3) further comprises a first reinforcing deformation buckling boss, which ensures the buckling strength of the first buckling ring (12) and the buckling groove (14) during buckling, and enhances the buckling strength of the second buckling ring (13) and the high-pressure composite pipe (2); and a second reinforcing deformation buckling boss, a third reinforcing deformation buckling boss and a fourth reinforcing deformation buckling boss, which enhance the engagement strength of the internal protrusions of the sleeve (3) and the rubber pipe; And a fifth reinforcing deformation buckling boss, which enhances the engagement strength of the covering sleeve at the tail end of the sleeve (3) and the rubber pipe to prevent rainwater from entering; The sleeve (3) is buckled to the outside of the anti-wait layer (26) or the anti-pull-out reinforcing layer (25) of the high-pressure composite pipe (2) and can be fixed with the core rod (1); the sleeve (3) comprises a first pressing ring (12), a second pressing ring (13) and a first connecting groove (10) between the first pressing ring (12) and the second pressing ring (13); the second pressing ring (13) has a limiting inclined slope (19) for limiting towards the first pressing ring (12); after buckling, the first pressing ring (12) of the sleeve (3) enters the connecting ring (5) of the core rod (1), so that the core rod (1) and the sleeve (3) are rigidly hooked and connected. The inside of the sleeve (3) gradually shrinks with gradually increasing distance between the convex teeth, and the distance between the convex teeth is not equal to the distance between the deformation grooves, so that the compression deformation amount of the inside convex teeth is not equal to the compression deformation amount of the deformation grooves, and the transition from shallow occlusion to deep occlusion of the high-pressure composite pipe is formed; after buckling, the inside convex teeth, the accommodating groove and the high-pressure composite pipe are in contact, under the action of radial pressure, the wall thickness of the high-pressure composite pipe is compressed between the sleeve and the core rod, and the end of the high-pressure composite pipe is compressed into a wave shape into the groove between the convex teeth of the sleeve, or the second pressing ring (13) and the third pressing ring (15) of the sleeve (3) are buckled with the first glue containing groove (6) and the second glue containing groove (7) respectively, and the mouth end of the high-pressure composite pipe (2) is pressed into a wave shape into the first glue containing groove (6) and the second glue containing groove (7).

2. A high pressure hose according to claim 1, characterized in that The inside of the sleeve has a plurality of convex teeth protruding towards the inside of the sleeve along the axial direction, and the two ends of the convex teeth along the axial direction are inclined to the inner wall of the sleeve to enhance the contact area between the high-pressure composite pipe and the sleeve after buckling and occlusion, thereby enhancing the friction resistance to pulling out; wherein the first convex tooth adjacent to the first pressing ring (12) of the sleeve (3) is the second pressing ring (13), and the second pressing ring (13) has an inclined chamfer greater than 45° inclined to the inner wall of the sleeve at one end thereof along the axial direction towards the first pressing ring (12), for the guiding surface of the core rod during buckling.

3. A high pressure hose according to claim 1, characterized in that The connecting ring (5) has a positioning working surface (9) perpendicular to the axis of the core rod (1) on the side of the high-pressure composite pipe (2) in the axial direction of the core rod (1) for limiting the end face of the high-pressure composite pipe (2), which is used for limiting when the core rod (1) after being coated with glue is inserted into the high-pressure composite pipe (2); the first glue containing groove (6) and the second glue containing groove (7) distributed in the axial direction of the core rod (1) contain the excess glue when the core rod (1) after being coated with glue is inserted into the high-pressure composite pipe (2), and after the sleeve is pressed, the first glue containing groove (6) and the second glue containing groove (7) correspond to the buckling position of the second pressing ring (13) and the third pressing ring (15) on the inner side of the sleeve (3) on the side of the first pressing ring (12) of the sleeve (3) towards the high-pressure composite pipe (2), and the positioning reference of the buckling position corresponds to the hooking connection surface (20) of the connecting ring (5) and the first pressing ring (12) of the sleeve, which is used for positioning the center position of the first glue containing groove (6) and the second glue containing groove (7) of the core rod (1), and positioning the center position of the second pressing ring (13) and the third pressing ring (15) of the sleeve (3).

4. A high pressure hose according to claim 3, characterized in that The limiting ring (4) is a metal limiting ring; the side of the limiting ring towards the buckling groove (14) has a limiting inclined surface (8), which is used for ensuring that the first pressing ring (12) completely slides into the buckling groove (14) when the sleeve (3) is buckled and deformed, so that the first pressing ring (12) is in contact with the hooking connection surface (20).

5. A high pressure hose according to claim 4, characterized in that The second pressing ring (13) corresponds to the first glue containing groove (6); the third pressing ring (15) corresponds to the second glue containing groove (7), which is used for bending the mouth end of the high-pressure composite pipe (2) after buckling, for sealing and resisting the pulling out between the high-pressure composite pipe and the core rod (1).

6. A high pressure hose according to claim 5, characterized in that The length value of the arc length of the inner arc surface from the first glue containing groove (6) to the second glue containing groove (7) of the core rod (1) gradually decreases, so that the stress change of the inner contact layer with higher hardness of the resin pipe in the recess has a transition, and the strain change is not abrupt, thereby having a structure form for eliminating stress concentration.

7. A high pressure hose according to claim 1, characterized in that The core rod comprises a head, a middle part and a tail connected together; the outer side of the head has a limiting ring (4) protruding in the radial direction of the core rod; the outer side of the middle part has a connecting ring (5) distributed in the axial direction of the core rod and protruding from the circumference of the core rod; the tangent plane of the circumference of the tail of the core rod and the axial direction of the core rod form a first transition angle.

8. A high pressure hose according to claim 7, characterized in that The angle range of the first transition angle is 6°-10°, and the length of the first transition angle in the extension direction of the core rod is 10 mm.

9. A high pressure hose according to claim 1, characterized in that The sleeve (3) tail end of the package, for buckling with the contact layer to prevent the infiltration of rain, and has a limit the high pressure composite pipe (2) over bending caused by the sleeve (3) directly with the hard bite damage of the anti-pullout reinforcement layer.

10. A high pressure hose according to claim 1, characterized in that The anti-pullout reinforcement layer is connected to the sliding and rolling anti-bending layer outside by winding carbon fiber cloth, the anti-pullout reinforcement layer is formed outside the anti-pullout reinforcement layer, the sleeve (3) has at least one second compression ring (13) pressed on the anti-pullout reinforcement layer or the anti-pullout reinforcement layer, which ensures that the sleeve compression will compress the sliding and rolling anti-bending layer in the high pressure composite pipe (2) and limit it in the pre-compression sliding and rolling space between the limiting inclined surface (19) of the second compression ring (13) of the sleeve (3) and the positioning working surface (9), ensuring that the carbon fiber cloth is not pulled out.

Images