Hose assembly, hose and preparation method

Abstract

The invention discloses a hose assembly, a hose and a preparation method, and relates to the technical field of hose connection. The hose assembly comprises a hose body and a connector which are coaxially arranged; the connector comprises a connector piece, an inner core and a sleeve. The connector piece is provided with a connector through hole, the first end of the inner core is communicated with the connector through hole, and the second end of the inner core is sleeved with the sleeve. A sleeve convex groove, a sleeve protrusion and a sleeve boss are sequentially arranged on the inner circumferential face of the sleeve in the first direction. An inner core groove, a limiting protrusion, a first inner core protrusion and a second inner core protrusion are sequentially arranged on the outer circumferential face of the inner core in the first direction. When the hose body is arranged between the outer circumferential face of the second end of the inner core and the inner circumferential face of the sleeve in a sleeved mode, the sleeve convex groove is clamped into the inner core groove, the sleeve protrusion and the first inner core protrusion are meshed in a staggered mode, and the sleeve boss and the second inner core protrusion are meshed in an aligned mode. According to the technical scheme, the structures of the hose body, the inner core and the sleeve tend to be integrated, and deformation of all parts of the hose assembly under high pressure and ultrahigh pressure is avoided.

Description

Technical Field

[0001] This invention relates to the field of hose connection technology, and in particular to a hose assembly, a hose, and a method for manufacturing it. Background Technology

[0002] As an indispensable component in the high-pressure cleaning industry, petrochemical field, and machinery manufacturing field, the hose assembly's characteristics such as resistance to ultra-high pressure, corrosion resistance, and wear resistance directly determine the working performance of the supporting equipment.

[0003] However, the components of existing hose assemblies are prone to deformation under high and ultra-high pressure, resulting in poor sealing performance of the hose assembly. Summary of the Invention

[0004] In view of this, the present invention provides a hose assembly that integrates the structure of the hose body, inner core and sleeve, avoids deformation of the various components of the hose assembly under high pressure and ultra-high pressure, and improves the sealing performance of the hose assembly.

[0005] The present invention also provides a hose comprising the above-described hose body.

[0006] The present invention also provides a method for preparing a flexible tube.

[0007] To achieve the above objectives, the present invention provides the following technical solution:

[0008] A hose assembly includes: a hose body and a connector arranged coaxially;

[0009] The connector includes: a connector component, an inner core, and a sleeve;

[0010] The connector has a connector through hole, the first end of the inner core is connected to the connector through hole, the second end of the inner core is fitted into the sleeve, and the extension direction from the first end of the inner core to the second end of the inner core is the first direction;

[0011] The inner circumferential surface of the sleeve is provided with a sleeve groove, a sleeve protrusion and a sleeve boss in sequence along the first direction, and the outer circumferential surface of the inner core is provided with an inner core groove, a limiting protrusion, a first inner core protrusion and a second inner core protrusion in sequence along the first direction.

[0012] When the hose body is sleeved between the outer peripheral surface of the second end of the inner core and the inner peripheral surface of the sleeve, the sleeve protrusion is engaged in the groove of the inner core, the sleeve protrusion and the first inner core protrusion are misaligned and engaged, and the sleeve boss and the second inner core protrusion are aligned and engaged; wherein, the side of the limiting protrusion away from the groove of the inner core is used to abut against the end face of the hose body to limit the position of the hose body.

[0013] Preferably, the outer peripheral surface of the inner core is further provided with a plurality of inner core bosses arranged along the first direction, the inner core bosses being located between the first inner core protrusion and the second inner core protrusion.

[0014] Preferably, there are multiple sleeve bosses, which are arranged along the first direction, and the sleeve boss furthest from the sleeve protrusion is aligned and engaged with the second inner core protrusion.

[0015] A hose, comprising: the hose body described above.

[0016] Preferably, the hose body comprises: a polyoxymethylene inner liner, a skeleton layer, a fiber layer, and a thermoplastic polyurethane protective layer arranged sequentially from the inside out.

[0017] Preferably, the skeleton layer comprises multiple layers of wire winding sequentially arranged along the diameter direction of the hose body; wherein the innermost wire winding layer is the first wire winding layer, the outermost wire winding layer is the Nth wire winding layer, the wire winding angle of the first wire winding layer is α, and from the first wire winding layer to the Nth wire winding layer, the wire winding angle α of each wire winding layer increases by a preset degree, and the wire winding angle α of the Nth wire winding layer does not exceed 66 degrees; wherein N is a positive integer.

[0018] Preferably, the range of the wire winding angle α of the first wire winding layer is 53 to 55 degrees, and the range of the preset angle is 0.3 to 0.6 degrees.

[0019] A method for preparing a hose body, the method comprising the following steps:

[0020] The polyoxymethylene material is dried, then extruded and cooled to form a polyoxymethylene liner.

[0021] A skeleton layer, a fiber layer, and a thermoplastic polyurethane protective layer are sequentially laid on the polyoxymethylene liner layer, wherein an adhesive is applied between the polyoxymethylene liner layer and the skeleton layer, and an adhesive is applied between the fiber layer and the thermoplastic polyurethane protective layer.

[0022] Preferably, the polyoxymethylene liner is prepared from raw materials in the following parts by weight:

[0023] 80-90 parts polyoxymethylene, 5-10 parts nano calcium carbonate, 1-3 parts surface treatment agent, 1-3 parts compatibilizer, 0.2-0.8 parts antioxidant, 0.2-0.8 parts ultraviolet absorber.

[0024] Preferably, the preparation of the polyoxymethylene liner includes, by weight, 80 parts of polyoxymethylene, 5 parts of nano-calcium carbonate, 1 part of surface treatment agent, 1 part of compatibilizer, 0.2 parts of antioxidant, and 0.2 parts of ultraviolet absorber.

[0025] Preferably, the preparation of the polyoxymethylene liner includes, by weight, 85 parts polyoxymethylene, 8 parts nano-calcium carbonate, 2 parts surface treatment agent, 2 parts compatibilizer, 0.5 parts antioxidant, and 0.5 parts ultraviolet absorber.

[0026] Preferably, the preparation of the polyoxymethylene liner includes, by weight, 90 parts of polyoxymethylene, 10 parts of nano-calcium carbonate, 3 parts of surface treatment agent, 3 parts of compatibilizer, 0.8 parts of antioxidant, and 0.8 parts of ultraviolet absorber.

[0027] As can be seen from the above technical solution, the hose assembly provided by the present invention utilizes the clamping force formed by the mutual clamping of the sleeve protrusion and the inner core groove, the first biting force formed by the mutual engagement of the sleeve protrusion and the first inner core protrusion, and the second biting force formed by the mutual engagement of the sleeve boss and the second inner core protrusion. Under the combined action of the above clamping force, the first biting force and the second biting force, the hose body that undergoes appropriate deformation is firmly sleeved between the inner core and the sleeve, so that the structure of the hose body, the inner core and the sleeve tends to be integrated, avoiding deformation of various components of the hose assembly under high pressure and ultra-high pressure, and improving the sealing performance of the hose assembly.

[0028] The present invention also provides a flexible hose, which has corresponding beneficial effects due to the use of the above-mentioned flexible hose body, as can be seen from the previous description, and will not be repeated here.

[0029] This invention also provides a method for preparing a flexible hose, which uses polyoxymethylene material as the inner lining layer, multiple layers of steel wire winding as the skeleton layer, an additional fiber braiding layer on the skeleton layer, and thermoplastic polyurethane as the protective layer to replace the inner polyvinyl chloride material in the prior art. The reinforcing layer is made of aramid material braiding, and the outer layer is made of polyurethane material to form a resin hose assembly. This method solves the problems of hose bursting, leakage, connector deformation, poor sealing performance, and easy leakage caused by high and ultra-high pressure. Attached Figure Description

[0030] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0031] Figure 1 This is a half-sectional view of the hose assembly;

[0032] Figure 2 for Figure 1 A magnified view of the structure at point A in the middle;

[0033] Figure 3 This is a half-sectional view of the inner core;

[0034] Figure 4 This is a schematic diagram of the inner core boss;

[0035] Figure 5 This is a schematic diagram of the sleeve structure;

[0036] Figure 6 This is a cross-sectional view of the hose body;

[0037] Figure 7 This is a first-view structural diagram of the hose body (the corresponding parts of the polyoxymethylene liner, skeleton layer, and fiber layer are hidden).

[0038] Figure 8 This is a structural schematic diagram of the hose body from a second perspective (the corresponding parts of the polyoxymethylene liner, skeleton layer, and fiber layer are hidden).

[0039] The meanings of the various reference numerals in the figure are as follows:

[0040] 10 is the hose body, 11 is the polyoxymethylene inner lining layer, 12 is the skeleton layer, 13 is the fiber layer, and 14 is the thermoplastic polyurethane protective layer.

[0041] 20 is the connector, 21 is the connector part, 211 is the connector through hole, 22 is the inner core, 221 is the inner core groove, 222 is the limiting protrusion, 223 is the first inner core protrusion, 224 is the inner core protrusion, 225 is the inner core boss, 23 is the sleeve, 231 is the sleeve groove, 232 is the sleeve protrusion, and 233 is the sleeve boss. Detailed Implementation

[0042] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0043] The hose assembly provided in the embodiments of the present invention, such as Figure 1 As shown, it includes: a flexible hose body 10 and a connector 20 arranged coaxially;

[0044] The connector 20 includes: a connector 21, an inner core 22, and a sleeve 23;

[0045] The connector 21 has a connector through hole 211, the first end of the inner core 22 communicates with the connector through hole 211, the second end of the inner core 22 is fitted into the sleeve 23, and the direction of extension from the first end to the second end of the inner core 22 is a first direction, as shown in the figure. Figure 1 As indicated by the arrow;

[0046] Among them, the inner circumferential surface of the sleeve 23 is provided with a sleeve groove 231, a sleeve protrusion 232 and a sleeve boss 233 in sequence along the first direction, such as Figure 5 As shown, the outer peripheral surface of the inner core 22 is provided with an inner core groove 221, a limiting protrusion 222, a first inner core protrusion 223, and a second inner core protrusion 224 in sequence along the first direction, as follows: Figure 3 As shown;

[0047] like Figure 2 As shown, when the hose body 10 is sleeved between the outer peripheral surface of the second end of the inner core 22 and the inner peripheral surface of the sleeve 23, the sleeve protrusion 231 is engaged in the inner core groove 221, the sleeve protrusion 232 and the first inner core protrusion 223 are misaligned and engaged, and the sleeve boss 233 and the second inner core protrusion 224 are aligned and engaged; wherein, the side of the limiting protrusion 222 away from the inner core groove 221 is used to abut against the end face of the hose body 10 to limit the position of the hose body 10.

[0048] In the above technical solution, during use, the connector 21 is connected to other pipes, and the hose body 10 is sleeved between the inner core 22 and the sleeve 23. The clamping force formed by the sleeve protrusion 231 and the inner core groove 221 interlocking, the first biting force formed by the sleeve protrusion 232 and the first inner core protrusion 223 biting, and the second biting force formed by the sleeve boss 233 and the second inner core protrusion 224 biting, combined with the clamping force, the first biting force, and the second biting force, firmly sleeve the hose body 10, which undergoes appropriate deformation, between the inner core 22 and the sleeve 23. This makes the structure of the hose body 10, the inner core 22, and the sleeve 23 more integrated, preventing deformation of the hose assembly components under high or ultra-high pressure, and improving the sealing performance of the hose assembly. Furthermore, the sleeve protrusion 231 and the inner core groove 221 can be connected by a snap-fit ​​method or a threaded connection.

[0049] Optimize the above technical solutions, such as Figure 2 and Figure 4As shown, the outer circumferential surface of the inner core 22 is also provided with a plurality of inner core protrusions 225 arranged along the first direction. The inner core protrusions 225 are located between the first inner core protrusion 223 and the second inner core protrusion 224. In this technical solution, the plurality of inner core protrusions 225 provide a biting force acting on the hose body 10, causing the hose body 10 to move towards the sleeve 23, so that the hose body 10 is firmly fixed between the inner core 22 and the sleeve 23. Among them, the sleeve protrusion 232 and the first inner core protrusion 223 are aligned and bitten, so that the hose body 10 is deformed into an arc-shaped deformation section under force. The inner core protrusion 224 presses the hose body 10 to form an arc-shaped sealing end. This arrangement not only increases the resistance to pull-out, but also greatly improves the sealing performance of the two arcs, so that the hose assembly has excellent comprehensive performance. In addition, the sleeve groove 231 can be snapped into the inner core groove 221. The protrusion height of the sleeve protrusion 255 is less than the height of the first inner core protrusion 223. The inner wall of the inner core 22 is provided with a flared opening, which is located at the tail end of the inner core (i.e., the end away from the connector 21). The flared opening reduces the impact of the rotational impact between the tail end of the inner core and the transport medium on the inside of the hose during use, greatly improving the service life of the hose assembly and reducing the risk of assembly leakage. The inner core 22 has two inner core protrusions 224, which form an arc-shaped sealing end after crimping, making it more suitable for the operating conditions and pressures of ultra-high pressure resin hoses.

[0050] In optimizing the above technical solutions, such as Figure 2 and Figure 5 As shown, there are multiple sleeve bosses 233, arranged along a first direction, with the sleeve boss 233 furthest from the sleeve protrusion 232 engaging with the second inner core protrusion 224. In use, all the sleeve bosses 233 provide an engaging force to the hose body 10, causing the hose body 10 to shift towards the inner core 22, thus firmly fixing the hose body 10 between the inner core 22 and the sleeve 23. The sleeve bosses 233 are barbed bosses, with a protrusion height less than that of the sleeve protrusion 232. Preferably, the first inner core protrusion 223, sleeve protrusion 232, inner core protrusion 224, sleeve protrusion 255, and sleeve bosses 233 all have rounded chamfers. The inner core protrusion 224 and inner core boss 225 press against the inner wall of the hose body, increasing the sealing performance between the hose body 10 and the inner core 22.

[0051] In one alternative technical solution, the inner wall of the hose body 10 has a hose inner layer, an inner core 22 and a sleeve 23 are sleeved together, the sleeved part clamps the end of the hose body 10, and pressure is applied to the sleeve 23 to deform it and securely clamp the end of the hose body 10. The hose assembly can withstand the internal pressure of the hose body and a high pull-out force without the hose body 10 separating from the connector 20 (which is a metal connector), and has excellent sealing performance, is not easy to leak, and has a simple manufacturing process and low manufacturing cost.

[0052] In one alternative technical solution, the sleeve groove 231, the connector through hole 221 and the limiting protrusion 222 cooperate with each other to generate an interaction force on the limiting protrusion 222.

[0053] This invention also provides a flexible hose, comprising: a hose body as described above. Since this solution uses the aforementioned hose body, it possesses corresponding beneficial effects, as detailed in the preceding description, which will not be repeated here.

[0054] In one of the alternative technical solutions, such as Figure 6 and Figure 7 As shown, the hose body 10 includes, from the inside out, a polyoxymethylene (POM) inner liner 11, a skeleton layer 12, a fiber layer 13, and a thermoplastic polyurethane protective layer 14. Specifically, the POM inner liner 11 has the functions of reducing friction, wear resistance, and chemical corrosion resistance; by laying the fiber layer 13 to fix the skeleton layer 12, the hose body 10 has the characteristics of high strength, high rigidity, lightweight, impact resistance, fatigue resistance, and flame retardancy; the setting of the thermoplastic polyurethane protective layer 14 gives the hose body 10 high elasticity, toughness, and excellent wear resistance; the setting of the skeleton layer 12 makes the structure of the hose body 10 more robust and its performance better.

[0055] In the above technical solution, the thickness of the polyoxymethylene inner lining layer 11 is 2.0–3.0 mm; the thickness of the thermoplastic polyurethane protective layer 14 is 2.0–4.0 mm; and the fiber layer 13 includes several aramid fibers, with a thickness of approximately 0.22–0.26 mm. Furthermore, the fiber layer 13 is a braided fiber layer, where fibers are laid on the skeleton layer 12 through braiding, creating tension on the surface of the skeleton layer 12. The hose body can be an ultra-high pressure resin hose, as the product structure and manufacturing process of ultra-high pressure resin hoses differ from those of ordinary rubber hoses. Ultra-high pressure resin hoses contain no rubber components and have a special structure, using a fiber layer to fix the skeleton layer. This improves production efficiency when the hose body 10 is transferred to subsequent assembly production.

[0056] In one alternative technical solution, to further ensure the stability of the skeleton layer 12 structure, such as... Figure 7 and Figure 8As shown, the skeleton layer 12 consists of multiple layers of wire winding arranged sequentially along the diameter direction of the hose body 10. The innermost layer is the first layer, and the outermost layer is the Nth layer. The winding angle of the first layer is α. From the first layer to the Nth layer, the winding angle α of each layer increases by a predetermined degree, and the winding angle α of the Nth layer does not exceed 66 degrees. Here, N is a positive integer. Preferably, the winding angle α of the first layer ranges from 53 to 55 degrees, and the predetermined degree ranges from 0.3 to 0.6 degrees. Specifically, according to the formula T=πD / tanα, where T is the stroke, D is the outer diameter of the current wire winding layer, and α is the wire winding angle of the wire winding layer, the stroke of adjacent wire winding layers can be calculated. Following this method, the winding angles and strokes of other wire winding layers are successively designed. Taking the hose body 10 with an inner diameter of 19mm as an example, each wire winding layer is formed by spiral winding of the wire. The first wire winding layer has a wire winding angle α of 53.2 degrees, an outer diameter of 24mm, and a stroke of 55mm; the second wire winding layer has a wire winding angle α of 54.2 degrees, an outer diameter of 25.2mm, and a standard stroke of 56.9mm; the third wire winding layer… The wire winding angle α of the fourth layer is 54.2 degrees, the outer diameter is 26.4 mm, and the standard stroke is 58.4 mm; the wire winding angle α of the fourth layer is 54.8 degrees, the outer diameter is 27.6 mm, and the standard stroke is 59.8 mm; the wire winding angle α of the fifth layer is 55.3 degrees, the outer diameter is 28.8 mm, and the standard stroke is 61.3 mm; the wire winding angle α of the sixth layer is 55.9 degrees, the outer diameter is 30 mm, and the standard stroke is 62.5 mm; each layer of wire winding is coated with an adhesive; and the surface of the wire in each layer is coated with a brass layer with a thickness of 0.14–0.32 μm.

[0057] In the above technical solution, the tube structure is designed according to the hose process design theory, and the optimal process parameters are determined: inner rubber thickness, reinforcing layer diameter, winding stroke, spool tension, outer diameter and density, etc.

[0058] Taking Φ19mm×160Mpa (PB is 400MPa) as an example, which means a hose with an inner diameter of 19mm and a working pressure of 160MPa, copper-plated steel wires of different diameters are selected. According to the following formula and table, the number of steel wire layers i and the steel wire diameter d are determined: The formula for calculating the pressure resistance is as follows:

[0059] ;

[0060] ;

[0061] ;

[0062] ;

[0063] Among them, P B The burst pressure of the hose body is measured in MPa; K B The strength of the steel wire is expressed in N / mm². 2 N is the number of unidirectional steel wires; d is the steel wire diameter in cm; D1 is the average diameter of the skeleton layer in cm; i is the number of unidirectional steel wire layers; p is the average density of the steel wire layer; and C is the comprehensive correction coefficient.

[0064] Based on the above winding method, the calculated PB = 432 MPa meets the requirement of a burst pressure of 400 MPa. The basic design parameters for the hose are: number of wire layers i = 6, wire diameter d = 0.6 mm, winding angles of 53.2 degrees, 53.6 degrees, 54.2 degrees, 54.8 degrees, 55.3 degrees, and 55.9 degrees; and winding strokes of 55, 56.9, 58.4, 59.8, 61.3, and 62.5 mm. In one embodiment, the number of wire layers i can be set to 8, such as... Figure 8 As shown.

[0065] To demonstrate the performance of the optimized pipe structure, four control groups were set up for comparison. The specifications of the ultra-high pressure resin hoses (corresponding to the hose body 10 in this technical solution) in the control groups were 8-8S-320 (inner diameter 8mm, 8 layers of steel wire winding, working pressure 320MPa), 13-6S-180 (inner diameter 13mm, 6 layers of steel wire winding, working pressure 180MPa), 13-4S-140 (inner diameter 13mm, 4 layers of steel wire winding, working pressure 180MPa), and 19-6S-160 (inner diameter 19mm, 6 layers of steel wire winding, working pressure 160MPa). Each control group included two test groups with only different steel wire winding angles. The specific experimental results are shown in the table below, and the hose body is an ultra-high pressure resin hose.

[0066] Table 1. Changes in product performance indicators before and after optimization of the winding angle of ultra-high pressure resin hose with specification model 8-8S-320.

[0067]

[0068] Table 2. Changes in product performance indicators before and after optimization of the winding angle of ultra-high pressure resin hose with specification model 13-6S-180.

[0069]

[0070] Table 3. Changes in product performance indicators before and after optimization of the winding angle of ultra-high pressure resin hose with specification model 13-4S-140.

[0071]

[0072] Table 4. Changes in product performance indicators before and after optimization of the winding angle of ultra-high pressure resin hose with specification model 19-6S-160.

[0073]

[0074] The above experiments show that:

[0075] After implementing the steel wire winding method disclosed in this solution, both the working pressure and burst pressure of the ultra-high pressure resin hose are enhanced. Based on this, the winding angle of each steel wire winding layer in the skeleton layer 12 is improved, and the coordination between adjacent steel wire winding layers is improved, resulting in higher mechanical strength for the ultra-high pressure resin hose. The ultra-high pressure resin hose can achieve higher working pressure (up to 320MPa) and higher burst pressure (up to 800MPa), making it suitable for different environments or fields, such as the high-pressure cleaning industry, petrochemical industry, and machinery manufacturing industry.

[0076] A method for preparing a flexible tube, the method comprising the following steps:

[0077] The polyoxymethylene material is dried, then extruded and cooled to form the polyoxymethylene inner lining 11.

[0078] In the above technical solution, the polyoxymethylene (POM) material can be a modified and toughened POM material. First, the modified and toughened POM material is dried using a vacuum drying method. The drying conditions are: pressure ≤1333 Pa, temperature 80–120℃, material layer thickness <25 mm, and time 10–16 hours. Then, the modified and toughened POM material is extruded into shape using a single-screw extruder, and then cooled and shaped using cooling water. The shaping process involves internal and external cooling water channels injected into the interior and exterior of the molded POM liner 11 for rapid cooling and shape maintenance. The cooling water temperature is controlled at approximately 15–22℃. The POM liner 11 is obtained by traction using a single-screw extruder at an extrusion speed of 5–15 m / min and an extrusion pressure of 50–150 MPa.

[0079] A skeleton layer 12, a fiber layer 13, and a thermoplastic polyurethane protective layer 14 are sequentially laid on the polyoxymethylene liner 11, wherein an adhesive is applied between the polyoxymethylene liner 11 and the skeleton layer 12, and an adhesive is applied between the fiber layer 13 and the thermoplastic polyurethane protective layer 14.

[0080] In an alternative technical solution, the polyoxymethylene liner 11 is further prepared from raw materials according to the following parts by weight:

[0081] The mixture comprises 80-90 parts polyoxymethylene (POM), 5-10 parts nano-calcium carbonate, 1-3 parts surface treatment agent, 1-3 parts compatibilizer, 0.2-0.8 parts antioxidant, and 0.2-0.8 parts UV absorber. This composition significantly improves the wear resistance of the POM lining layer 11, reduces wear during friction, maintains good mechanical properties, enhances the uniformity and stability of material properties, and extends service life.

[0082] In one optional technical solution, the preparation of the polyoxymethylene liner 11 includes, by weight, weighing 80 parts of polyoxymethylene, 5 parts of nano-calcium carbonate, 1 part of surface treatment agent, 1 part of compatibilizer, 0.2 parts of antioxidant, and 0.2 parts of ultraviolet absorber.

[0083] In one optional technical solution, the preparation of the polyoxymethylene liner 11 includes, by weight, weighing 85 parts of polyoxymethylene, 8 parts of nano-calcium carbonate, 2 parts of surface treatment agent, 2 parts of compatibilizer, 0.5 parts of antioxidant, and 0.5 parts of ultraviolet absorber.

[0084] In one optional technical solution, the preparation of the polyoxymethylene liner 11 includes, by weight, weighing 90 parts of polyoxymethylene, 10 parts of nano-calcium carbonate, 3 parts of surface treatment agent, 3 parts of compatibilizer, 0.8 parts of antioxidant, and 0.8 parts of ultraviolet absorber.

[0085] In one alternative technical solution, during use, the dimensions of the thermoplastic polyurethane protective layer 14 to be peeled off are determined by measuring the data of the sleeve 23, and the dimensions of the polyoxymethylene inner lining layer 11 to be peeled off are determined by measuring the data of the inner core 22. After the adhesive is peeled off, the sleeve 2 is first put on the outside of the hose body 10, and then the inner core 22 is inserted into the inside of the hose body 20.

[0086] In an optional embodiment, before the connector 20 clamps the hose body 10, the polyoxymethylene inner liner 11 and the thermoplastic polyurethane protective layer 14 at the connection between the hose body 10 and the connector 20 are peeled off. After peeling, the distance between the surface of the first inner core protrusion 223 and the skeleton layer 12 is 2-4 mm, and the distance between the surface of the sleeve protrusion 232 and the skeleton layer 12 is also 2-4 mm. After the connector 20 clamps the hose body 10, the first inner core protrusion 223 and the skeleton layer 12 are fitted together, and the sleeve protrusion 232 and the skeleton layer 12 are also fitted together.

[0087] The technical features mentioned above, those to be mentioned below, and those shown individually in the accompanying drawings can be combined arbitrarily, provided that the combined technical features are not contradictory. All feasible combinations of features are the technical content explicitly described herein. Any one of the multiple sub-features contained in the same statement can be applied independently, without necessarily being applied together with other sub-features.

[0088] The following is a further description of this solution with reference to specific embodiments:

[0089] The ultra-high pressure resin hose provided by this invention has better pressure resistance and less deformation under pressure. The polyoxymethylene lining layer 11 itself has wear resistance, chemical corrosion resistance, thermal stability, and impact absorption properties. During heat exchanger cleaning, the frictional resistance is low, and it will not damage the substrate of the equipment being cleaned. It will not cause any damage to the pipes or equipment, and can also clean parts with complex shapes and structures. It can be used in confined spaces, complex, harsh, and hazardous environments. Furthermore, the cleaned equipment and parts do not require further cleaning treatment, further reducing costs. The continuous service life of the ultra-high pressure resin hose can reach 800-1000 hours.

[0090] This technical solution replaces the existing resin hose assembly made of inner polyvinyl chloride material, reinforcing aramid material braiding, and outer polyurethane material. It solves the problems of hose bursting, leakage, connector deformation, poor sealing performance, and easy seepage when subjected to high and ultra-high pressure. A new ultra-high pressure resin hose assembly has been obtained, capable of withstanding pressures of thousands to tens of thousands of PSI and ultra-high pressure impacts, ensuring stable operation even in extreme working environments and guaranteeing safe system operation. It can withstand harsh chemicals, including acids and alkalis, without degradation or damage, making it ideal for hazardous material transfer and common petrochemical applications. It can also withstand repeated bending and flexing without cracking or other signs of damage, making it ideal for hydraulic systems and other applications requiring repeated movement. Due to the special nature of its raw materials, it can be recycled and granulated, possessing a certain degree of environmental friendliness. Simultaneously, the ultra-high pressure resin hose has good flexibility, allowing it to operate flexibly under conditions with a small bending radius, facilitating operator handling.

[0091] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0092] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A hose assembly, characterized in that, include: The hose body (10) and connector (20) are arranged coaxially. The connector (20) includes: a connector (21), an inner core (22), and a sleeve (23); The connector (21) has a connector through hole (211), the first end of the inner core (22) is connected to the connector through hole (211), the second end of the inner core (22) is fitted into the sleeve (23), and the extension direction from the first end of the inner core (22) to the second end of the inner core (22) is the first direction; The inner circumferential surface of the sleeve (23) is provided with a sleeve groove (231), a sleeve protrusion (232) and a sleeve boss (233) in sequence along the first direction. The outer circumferential surface of the inner core (22) is provided with an inner core groove (221), a limiting protrusion (222), a first inner core protrusion (223) and a second inner core protrusion (224) in sequence along the first direction. When the hose body (10) is sleeved between the outer peripheral surface of the second end of the inner core (22) and the inner peripheral surface of the sleeve (23), the sleeve protrusion (231) is engaged in the inner core groove (221), the sleeve protrusion (232) and the first inner core protrusion (223) are misaligned and engaged, and the sleeve boss (233) and the second inner core protrusion (224) are aligned and engaged; wherein, the side of the limiting protrusion (222) away from the inner core groove (221) is used to abut against the end face of the hose body (10) to limit the position of the hose body (10).

2. The hose assembly according to claim 1, characterized in that, The outer peripheral surface of the inner core (22) is also provided with a plurality of inner core protrusions (225) arranged along the first direction, and the inner core protrusions (225) are located between the first inner core protrusion (223) and the second inner core protrusion (224).

3. The hose assembly according to claim 2, characterized in that, The number of sleeve bosses (233) is multiple, and the multiple sleeve bosses (233) are arranged along the first direction, and the sleeve boss (233) furthest from the sleeve protrusion (232) is aligned and engaged with the second inner core protrusion (224).

4. A flexible hose, characterized in that, The hose body includes the hose assembly described in any one of claims 1 to 3 above.

5. The hose according to claim 4, characterized in that, The hose body (10) includes: a polyoxymethylene inner lining layer (11), a skeleton layer (12), a fiber layer (13), and a thermoplastic polyurethane protective layer (14) arranged sequentially from the inside out.

6. The hose according to claim 5, characterized in that, The skeleton layer (12) consists of multiple layers of wire windings arranged sequentially along the diameter direction of the hose body (10); wherein the innermost wire winding layer is the first wire winding layer, the outermost wire winding layer is the Nth wire winding layer, the wire winding angle of the first wire winding layer is α, and from the first wire winding layer to the Nth wire winding layer, the wire winding angle α of each wire winding layer increases by a preset degree, and the wire winding angle α of the Nth wire winding layer does not exceed 66 degrees; wherein N is a positive integer.

7. The hose according to claim 6, characterized in that, The range of the wire winding angle α of the first wire winding layer is 53 to 55 degrees, and the range of the preset angle is 0.3 to 0.6 degrees.

8. A method for preparing a flexible tube, characterized in that, The method for preparing the hose body according to any one of claims 1 to 7 comprises the following steps: The polyoxymethylene material is dried and then extruded and cooled to form a polyoxymethylene inner lining (11). A skeleton layer (12), a fiber layer (13), and a thermoplastic polyurethane protective layer (14) are sequentially laid on the polyoxymethylene liner (11), wherein an adhesive is applied between the polyoxymethylene liner (11) and the skeleton layer (12), and an adhesive is applied between the fiber layer (13) and the thermoplastic polyurethane protective layer (14).

9. The method for preparing a flexible tube according to claim 8, characterized in that, It also includes the preparation of the polyoxymethylene liner (11) using the following raw materials in parts by weight: 80-90 parts polyoxymethylene, 5-10 parts nano calcium carbonate, 1-3 parts surface treatment agent, 1-3 parts compatibilizer, 0.2-0.8 parts antioxidant, 0.2-0.8 parts ultraviolet absorber.

10. The method for preparing a flexible tube according to claim 9, characterized in that, The preparation of the polyoxymethylene liner (11) includes, by weight, 80 parts of polyoxymethylene, 5 parts of nano-calcium carbonate, 1 part of surface treatment agent, 1 part of compatibilizer, 0.2 parts of antioxidant, and 0.2 parts of ultraviolet absorber.

11. The method for preparing a flexible tube according to claim 9, characterized in that, The preparation of the polyoxymethylene liner (11) includes, by weight, 85 parts of polyoxymethylene, 8 parts of nano-calcium carbonate, 2 parts of surface treatment agent, 2 parts of compatibilizer, 0.5 parts of antioxidant, and 0.5 parts of ultraviolet absorber.

12. The method for preparing a flexible tube according to claim 9, characterized in that, The preparation of the polyoxymethylene liner (11) includes, by weight, 90 parts of polyoxymethylene, 10 parts of nano-calcium carbonate, 3 parts of surface treatment agent, 3 parts of compatibilizer, 0.8 parts of antioxidant, and 0.8 parts of ultraviolet absorber.

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