Telescopic water pipe and water pipe assembly

Abstract

The utility model discloses a telescopic water pipe and a water pipe assembly. In the telescopic water pipe, the elastic outer layer is spaced from the elastic inner pipe through the elastic woven layer, and the elastic woven layer is high in weaving density and can keep large-area contact with the elastic inner pipe in the telescopic process of the water pipe, so that strong tearing force of moving yarns can be eliminated, the elastic inner pipe is prevented from being torn by the yarns, and optimal protection is provided for the elastic inner pipe; the service life of the product is prolonged; the elastic woven layer with limited radial elasticity is adopted to tightly cover the outer part of the elastic inner pipe, so that the elastic inner pipe can be optimally protected; the elastic woven layer is wrapped by the elastic outer layer, so that the elastic woven layer and the elastic inner pipe can be protected on the basis of meeting radial and axial elastic deformation of the water pipe, foreign matters such as fine gravels are prevented from entering the water pipe, and the water pipe has the advantages of dirt resistance and wear resistance. The elastic inner pipe is of a flat structure, elastic deformation is rapid, residual liquid in the pipe can be fully discharged during pressure relief, water is saved, the device is more environmentally friendly, and the device is small in size and convenient to carry after being stored.

Description

TECHNICAL FIELD

[0001] The utility model relates to water pipe technical field especially relates to a telescopic water pipe and water pipe assembly. BACKGROUND

[0002] The traditional telescopic water pipe, the inner tube and the outer tube adopt movable gap cooperation, not only the outer tube is easy to wear, but also the inner tube expands rapidly after connecting the pressure water source, which will produce strong friction and tearing force with the wrinkled outer tube, and the sand, branches and other sundries are easy to pass through the outer tube in the using process, which causes the fatal damage to the inner tube in the expansion and contraction process, thereby reducing the service life of the water pipe.

[0003] Some technical solutions known by the inventor add a woven layer between the inner tube and the outer tube, and the outer tube and the inner tube are fused together through the area not covered by the woven layer. Although this structure can solve the problem that the inner tube is easily pierced by external sharp objects to some extent, when the inner tube connects the pressure water source and produces axial expansion, the woven layer will move relatively to the inner tube, and when the woven layer moves, the yarn will cut the connection between the inner tube and the outer tube, and then tear the inner tube, which increases the risk of water pipe burst and leakage, and reduces the service life of the water pipe.

[0004] Therefore, the utility model provides a novel telescopic water pipe and water pipe assembly to overcome the problem that the inner tube is easily torn and damaged by the woven layer, which increases the risk of water pipe burst and leakage and reduces the service life of the water pipe. UTILITY MODEL CONTENTS

[0005] The utility model aims at providing a novel telescopic water pipe and water pipe assembly to overcome the problem that the inner tube is easily torn and damaged by the woven layer, which increases the risk of water pipe burst and leakage and reduces the service life of the water pipe.

[0006] To achieve the above-mentioned purpose, the utility model provides the following scheme:

[0007] The utility model provides a telescopic water pipe, which comprises:

[0008] The elastic inner tube has a drainage channel inside, and the elastic inner tube can be axially elongated and radially elastically deformed when fluid pressure is introduced into the drainage channel, and can be axially shortened and radially restored when the drainage channel is depressurized.

[0009] a resilient inner tube, a resilient braided layer tightly sleeved outside the resilient inner tube, a radial circumference of the resilient inner tube being greater than a radial inner circumference of the resilient braided layer, the resilient inner tube and the resilient braided layer being in an interference fit, the resilient braided layer being able to axially stretch and contract along with the resilient inner tube when the resilient inner tube axially stretches and contracts, and being able to limit radial expansion of the resilient inner tube when the resilient inner tube radially elastically deforms;

[0010] a resilient outer layer tightly sleeved outside the resilient braided layer and spaced apart from the resilient inner tube by the resilient braided layer; the resilient outer layer being provided in at least one layer, the resilient outer layer being able to synchronously deform with the resilient braided layer.

[0011] In some embodiments, the resilient inner tube and the resilient outer layer are each provided in one layer.

[0012] In some embodiments, the resilient inner tube is in a flat tubular shape when no fluid pressure passes through the resilient inner tube.

[0013] In some embodiments, when the resilient inner tube is in a flat tubular shape, a tube wall of the resilient inner tube comprises two V-shaped structures on two sides and a connecting wall, the two V-shaped structures are oppositely arranged at openings of the two V-shaped structures, and the two V-shaped structures are connected by the connecting wall at both ends of the openings; and a wall thickness a of the V-shaped structure is not less than a thickness b of the connecting wall.

[0014] In some embodiments, the resilient inner tube is integrally extruded, and when the resilient inner tube is in a flat tubular shape, a distance D between tips of the two V-shaped structures is 10mm-100mm, and an outer side distance H between the two connecting walls is 1.2mm-12mm.

[0015] In some embodiments, the wall thickness a of the V-shaped structure is greater than the thickness b of the connecting wall, and a is 0.6mm-5mm and b is 0.5mm-3mm.

[0016] In some embodiments, the resilient outer layer is coated or extruded outside the resilient braided layer.

[0017] In some embodiments, the resilient outer layer is a thermoplastic elastomer structure, a natural rubber structure or a synthetic rubber structure; and the resilient inner tube is a thermoplastic elastomer structure, a natural rubber structure or a synthetic rubber structure.

[0018] In some embodiments, the elastic woven layer is an elastic dense woven structure woven outside the elastic inner tube in the stretched state of the elastic inner tube, the elastic dense woven structure is woven by a first yarn, a second yarn and a plurality of elastic filaments, the number of the first yarn and the second yarn is the same, the first yarn and the second yarn are obliquely woven along the outer periphery of the elastic inner tube, the plurality of elastic filaments are uniformly distributed along the outer periphery of the elastic inner tube, and any one of the elastic filaments is parallel to the axial direction of the elastic inner tube; any one of the elastic filaments is arranged at a cross-over interlacing point formed by the first yarn and the second yarn at a corresponding position.

[0019] In some embodiments, the oblique intersection angle of the first yarn and the second yarn is α, and 120°≤α<180°.

[0020] In some embodiments, the elastic woven layer is a diamond woven structure woven outside the elastic inner tube in the stretched state of the elastic inner tube, the diamond woven structure is obliquely woven by a first annular yarn and a second annular yarn along the circumference of the elastic inner tube, and the number of the first annular yarn and the second annular yarn is the same.

[0021] In some embodiments, the oblique intersection angle of the first annular yarn and the second annular yarn is β, and 120°≤β<180°.

[0022] The utility model also proposes a water pipe assembly, including any one of the telescopic water pipe of above-mentioned, at least one end of telescopic water pipe is equipped with the joint of installation, the joint is internal thread joint, ball valve water outlet or quick connector.

[0023] The utility model also proposes a preparation method of the telescopic water pipe, including:

[0024] The elastic inner tube is prepared by an extruder and a matched inner tube mold;

[0025] The elastic woven layer is coated and woven outside the elastic inner tube in the stretched state of the extruded elastic inner tube by a weaving machine;

[0026] The elastic outer layer is formed on the surface of the elastic inner tube coated with the elastic woven layer by extrusion or coating.

[0027] Compared with the prior art, the utility model has the following technical effects:

[0028] The telescopic water pipe has the characteristics of high pressure resistance, dirt resistance, wear resistance and long service life, can meet the diversified needs of users, and has the following specific beneficial effects:

[0029] (1) Not easy to leak and long service life: The elastic outer layer is not fused with the elastic inner tube. During the expansion and contraction of the telescopic water pipe, there is a slight slippage between the elastic inner tube and the elastic braided layer. The elastic braided layer has a high braiding density, which can maintain a large area of ​​contact with the elastic inner tube during the expansion and contraction of the water pipe. This can effectively resolve the strong tearing force of the moving yarn, prevent the yarn from tearing the elastic inner tube, provide the best protection for the elastic inner tube, and effectively extend the service life of the product.

[0030] (2) High pressure resistance: The elastic braided layer with radial elasticity limitation is tightly wrapped around the outside of the elastic inner tube, which can provide the best protection for the elastic inner tube.

[0031] (3) Not easy to get dirty and wear-resistant: The elastic outer layer is wrapped around the elastic braided layer, which can protect the elastic braided layer and the elastic inner tube while meeting the radial and axial elastic deformation of the water pipe, and prevent foreign objects such as fine sand and gravel from entering the water pipe. It has the advantages of being dirt-resistant and wear-resistant.

[0032] In some of the technical solutions disclosed in this utility model, the elastic inner tube adopts a flat structure, which can deform rapidly and fully drain the residual liquid in the tube when depressurizing, saving water and being more environmentally friendly; moreover, the telescopic water pipe is flat as a whole, which is easy to store when not in use, and its small size makes it easy to carry after storage.

[0033] The water pipe assembly proposed in this utility model includes the aforementioned telescopic water pipe and possesses all the features of the aforementioned telescopic water pipe, which will not be repeated here. Attached Figure Description

[0034] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0035] Figure 1 This is a schematic diagram of the structure of a telescopic water pipe when it is not extended or expanded, as disclosed in one or more embodiments;

[0036] Figure 2 for Figure 1 The diagram shows the structure of the telescopic water pipe when it expands and elongates under fluid pressure.

[0037] Figure 3 for Figure 1 Schematic diagram of the structure of the medium elastic braided layer;

[0038] Figure 4 A schematic cross-sectional view of the flat inner tube of a telescopic water pipe when it is not stretched or expanded, as disclosed in one or more embodiments;

[0039] Figure 5 The schematic diagram of the overall cross section of the flat stretchable water pipe disclosed in one or more embodiments;

[0040] Figure 6 The schematic diagram of the structure of the stretchable water pipe with another elastic braid layer when not stretched and expanded disclosed in one or more embodiments;

[0041] Figure 7 The schematic diagram of the structure of the stretchable water pipe shown when stretched and expanded by fluid pressure; Figure 6

[0042] Figure 8 The schematic diagram of the structure of the elastic braid layer in the middle; Figure 6

[0043] Figure 9 The schematic diagram of the structure of the water pipe assembly with internal threaded interfaces and ball valve water outlets at both ends disclosed in one or more embodiments;

[0044] Figure 10 The schematic diagram of the structure of the water pipe assembly with quick connectors and ball valve water outlets at both ends disclosed in one or more embodiments;

[0045] Figure 11 The schematic diagram of the structure of the water pipe assembly with quick connectors at both ends disclosed in one or more embodiments;

[0046] Figure 12 The schematic diagram of the structure of the water pipe assembly when coiled and stored disclosed in one or more embodiments;

[0047] Figure 13 The flow chart of the production process of the stretchable water pipe disclosed in one or more embodiments.

[0048] In the drawings, the reference signs are:

[0049] 100, stretchable water pipe; 200, water pipe assembly; 300, internal threaded interface; 400, ball valve water outlet; 500, quick connector;

[0050] 1, elastic outer layer;

[0051] 2, elastic braid layer; 21, first yarn; 22, second yarn; 23, elastic filament; α, the angle formed by the diagonal yarns of the elastic braid layer;

[0052] 3, elastic inner tube; 31, V-shaped structure; 32, connecting wall; D, the folding diameter of the flat stretchable water pipe; a, the wall thickness of the V-shaped structure; b, the wall thickness of the connecting wall;

[0053] 4, diamond braid structure; 41, first ring-shaped yarn; 42, second ring-shaped yarn; β, the angle formed by the two ring-shaped yarns; ​​

[0054] 5. Elastic inner tube extruder;

[0055] 6. Cooling box 1;

[0056] 7. Braiding machine;

[0057] 8. Elastic outer layer covering machine;

[0058] 9. Cooling box 2. DETAILED DESCRIPTION

[0059] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0060] One of the purposes of the present application is to provide a novel telescopic water pipe to overcome the problem that the inner pipe in the existing telescopic water pipe is easily torn and damaged by the braided layer, thereby increasing the hidden danger of water pipe burst and leakage and reducing the service life of the water pipe.

[0061] Another purpose of the present application is to provide a water pipe assembly comprising the telescopic water pipe.

[0062] In order to make the above purposes, features and advantages of the present application more apparent, obvious and easy to understand, the present application will be further described in detail below with reference to the drawings and specific embodiments.

[0063] Embodiment 1

[0064] The present embodiment provides a novel telescopic water pipe 100, as shown in Figure 1 and Figure 2As shown, it comprises an elastic braided layer 2, at least one elastic inner tube 3 and at least one elastic outer layer 1. When the elastic inner tube 3 is provided with only one layer, it has a drainage channel inside. The elastic braided layer 2 is tightly sleeved outside the elastic inner tube 3. The elastic braided layer 2 adopts a dense composite braided structure, which can stretch and contract axially under the driving of the elastic inner tube 3 when the elastic inner tube 3 stretches and contracts axially, and can limit the radial expansion of the elastic inner tube 3, often making the elastic inner tube 3 stretch axially, but the radial circumference becomes smaller or unchanged. When the elastic inner tube 3 is provided with at least two layers, the multiple layers of the elastic inner tube 3 are tightly nested layer by layer. The inside of the innermost elastic inner tube 3 forms the aforementioned drainage channel. The elastic braided layer 2 is tightly sleeved outside the outermost elastic inner tube 3. The radial circumference of the elastic inner tube 3 is larger than the radial inner circumference of the elastic braided layer 2, so that the elastic inner tube 3 and the elastic braided layer 2 are in an interference fit state. The elastic braided layer 2 can also be stacked with multiple layers as needed, but in order to ensure the flexibility of the water pipe, the elastic braided layer 2 is preferably provided with only one layer in this embodiment. The elastic outer layer 1 has high elasticity. When the elastic outer layer 1 is provided with only one layer, it is tightly sleeved outside the elastic braided layer 2. The elastic outer layer 1 is arranged separately from the elastic inner tube 3 through the elastic braided layer 2. When the elastic outer layer 1 is provided with at least two layers, the multiple layers of the elastic outer layer 1 are tightly nested layer by layer. The innermost elastic outer layer 1 is tightly sleeved outside the elastic braided layer 2. In actual production and application, the elastic outer layer 1 (or the innermost elastic outer layer 1) can be wrapped around the elastic braided layer 2 in an interference fit manner to fix the elastic outer layer 1 (or the innermost elastic outer layer 1) and the elastic braided layer 2. In order to ensure reliable fixation, the elastic outer layer 1 (or the innermost elastic outer layer 1) and the elastic braided layer 2 can also be tightly bonded by glue. As a preferred solution, this embodiment adopts the fixation solution of tightly bonding the elastic outer layer 1 (or the innermost elastic outer layer 1) and the elastic braided layer 2. At the same time, the elastic braided layer 2 and the adjacent elastic inner tube 3 are preferably wrapped tightly by the elastic braided layer 2, but there is no fixed connection between them, allowing slight relative sliding between the elastic braided layer 2 and the elastic inner tube 3 when the elastic inner tube 3 stretches and contracts. Based on the above structure, the elastic inner tube 3 is tightly covered by the elastic braided layer 2 and is not connected with the elastic outer layer 1. Based on this, a whole stretchable water pipe body structure with tightly combined layers is formed. Since the elastic inner tube 3 and the elastic outer layer 1 are not connected and are separated by the elastic braided layer 2, the problem of the connection between the inner and outer pipes of the existing stretchable water pipe being easily torn and damaged by the braided layer is solved, which can reduce the risk of water pipe burst and improve the service life of the elastic inner tube 3 and the whole water pipe. The number of layers of the elastic inner tube 3 and the elastic outer layer 1 can be adjusted according to the needs of production and application. The following will take the elastic inner tube 3 and the elastic outer layer 1 each provided with one layer as an example to explain the structure and use principle.

[0065] The elastic inner tube 3, the elastic woven layer 2 and the elastic outer layer 1 are coupled to form an integral stretchable water pipe through interlayer close combination, so that when fluid pressure is introduced into the drainage channel, the water pipe can expand radially under the action of fluid pressure and simultaneously realize limited axial elongation, and when the drainage channel is depressurized, the water pipe can quickly contract radially and shorten axially to return to the initial state. During the stretching and contraction of the water pipe, there is micro sliding between the elastic woven layer 2 and the elastic inner tube 3, and the micro sliding exists between the contact surfaces of the elastic woven layer 2 and the elastic inner tube 3. The surface contact sliding does not cause local damage to each other, which can ensure the damage-free stretching and contraction of the elastic inner tube 3 and prolong the service life of the water pipe.

[0066] In some embodiments, the elastic inner tube 3 can expand into a nearly circular pipe when fluid pressure is introduced, and after the drainage is depressurized, the elastic inner tube 3 can return to a flat tubular shape under the self-restoring action of its elasticity and the elastic restraint of the elastic woven layer 2 and the elastic outer layer 1. The flat tubular shape is the natural initial state of the elastic inner tube 3 when no water is introduced, and the specific structure is shown in Figure 1 、 Figure 4 and Figure 5 . The elastic inner tube 3 in the initial state of flat tubular shape is preferably integrally extruded by an extruder. This structure design basically does not affect the axial stretching and contraction performance of the elastic inner tube 3, but enables the elastic inner tube 3 to quickly return to the initial flat structure radially when the water pipe is depressurized, which is beneficial to expelling and draining the water in the elastic inner tube 3 and achieving the effect of water saving and environmental protection. Since the elastic woven layer 2 and the elastic outer layer 1 are both elastic structures, the expansion and contraction trends of the elastic woven layer 2 and the elastic outer layer 1 in the radial direction are basically consistent with that of the elastic inner tube 3, that is, when the elastic inner tube 3 expands to a nearly circular pipe or a circular pipe as shown in Figure 2 , the elastic woven layer 2 and the elastic outer layer 1 are also nearly circular pipes or circular pipes; and when the elastic inner tube 3 returns to the initial flat tubular shape, the elastic woven layer 2 and the elastic outer layer 1 remain in close contact with the elastic inner tube 3 due to the self-restoring action of their own elasticity, thereby being in a basically consistent flat tubular shape with the elastic inner tube 3, as shown in Figure 1 and Figure 5 . At this time, the entire stretchable water pipe 100 is in a flat tubular shape. It should be noted that when the entire stretchable water pipe 100 is in the flat tubular shape as shown in Figure 1 and Figure 5 , there is still a gap in the elastic inner tube 3, rather than being completely closed, to ensure that the elastic inner tube 3 can quickly change its geometry when water is introduced again.

[0067] In some embodiments, as shown in Figure 4 and Figure 5As shown, the elastic inner tube 3 is in a flat tubular shape, and its tube wall includes two V-shaped structures 31 on both sides and connecting walls 32. The openings of the two V-shaped structures 31 are oppositely arranged, and the two ends of the openings of the two V-shaped structures 31 are connected by a connecting wall 32 respectively, thereby forming a closed tube wall of the elastic inner tube 3. It should be noted that the V-shaped structure 31 and the connecting wall 32 are arranged along the axial direction of the elastic inner tube 3, and the V-shaped structure 31 and the connecting wall 32 are preferably integrally formed to ensure the integrity and uniformity of the elastic force of the elastic inner tube 3, so as to avoid the elastic inner tube 3 from being broken due to insufficient local elasticity when it is radially expanded. The radial geometric deformation elasticity of the elastic inner tube 3 is mainly provided by the V-shaped structure 31, that is, the radial contraction and radial expansion of the elastic inner tube 3 are mainly reflected in the size change of the opening of the V-shaped structure 31. Generally, the larger the opening of the V-shaped structure 31, the larger the included angle of the V-shaped structure 31, and the elastic inner tube 3 is radially expanded. Conversely, the smaller the opening of the V-shaped structure 31, the smaller the included angle of the V-shaped structure 31, and the elastic inner tube 3 is radially contracted.

[0068] In some embodiments, the internal drainage channel of the elastic inner tube 3 is in an empty state when the elastic inner tube 3 is in a flat tubular shape, and this state is also the forming state of the elastic inner tube 3. In this forming state, as shown in Figure 4 and Figure 5 As shown, the V-shaped structure 31 and the connecting wall 32 are preferably structures with uniform thickness, wherein the wall thickness a of the V-shaped structure 31 is greater than the thickness b of the connecting wall 32, so that the middle part of the overall tube wall of the elastic inner tube 3 is thin, and the two ends are thick, and the thickness of the connection between the connecting wall 32 and the V-shaped structure 31 is smoothly transitioned. In some feasible embodiments, as shown in Figure 4 the diameter D of the elastic inner tube 3 (i.e. the distance between the two tips of the V-shaped structure 31) can be 10mm-100mm, and the height H (i.e. the distance between the outer sides of the two connecting walls 32) can be 1.2mm-12mm; the wall thickness a of the V-shaped structure 31 can be 0.6mm-5mm, and the wall thickness b of the connecting wall 32 can be 0.5mm-3mm. As a preferred solution, the diameter D of the elastic inner tube 3 can be 20mm-50mm, and the height H can be 1.6mm-8mm; the wall thickness a of the V-shaped structure 31 can be 0.8mm-3mm, and the wall thickness b of the connecting wall 32 can be 0.5mm-2.2mm. The elastic inner tube 3 meeting the above structure and thickness size is preferably integrally extruded by an extruder through a specific mold. The shape and size of the cavity of the specific mold are matched with the elastic inner tube 3, and the specifications can be flexibly adjusted according to the size adjustment of the elastic inner tube 3.

[0069] In some embodiments, the material of the elastic inner tube 3 is preferably a high molecular elastic material, including but not limited to thermoplastic elastomer TPR, thermoplastic elastomer TPE, TPV (thermoplastic vulcanized rubber), TPU (thermoplastic polyurethane rubber), SEBS thermoplastic elastomer, natural rubber or other synthetic rubber.

[0070] In some embodiments, the elastic woven layer 2 is generally woven around the elastic inner tube 3 after the elastic inner tube 3 is stretched to a certain length (at which the elastic inner tube 3 is contracted as shown in the initial state), so as to ensure that the elastic woven layer 2 substantially adheres to the elastic inner tube 3 during the expansion and contraction of the elastic inner tube 3. Based on this, when fluid pressure is applied to the inside of the elastic inner tube 3: radially, the elastic inner tube 3 can rapidly expand from the flat structure as shown in the initial state to the near-circular structure as shown in the expanded state within the limited elastic range of the elastic woven layer 2, and the elastic woven layer 2 can limit the elastic inner tube 3 to continue to expand radially after reaching the state as shown in the expanded state; axially, the elastic inner tube 3 can achieve a limited elongation, and at the same time, due to the interference fit between the elastic woven layer 2 and the elastic inner tube 3, the elastic woven layer 2 and the elastic outer layer 1 also have a certain length of axial elongation under the driving of the elastic inner tube 3. Conversely, when the pressure in the elastic inner tube 3 is released, radially, the elastic inner tube 3 can rapidly recover to the flat structure as shown in the initial state, and axially, the elastic inner tube 3, the elastic woven layer 2, and the elastic outer layer 1 can rapidly contract and recover to the initial axial length. The elastic woven layer 2 is preferably an elastic dense woven structure, and there is a slight sliding between the elastic woven layer 2 and the elastic inner tube 3 during the expansion and contraction of the water pipe. Figure 4 Figure 1 Figure 2 Figure 2 Figure 1

[0071] In some feasible embodiments, the elastic dense woven structure is woven by a plurality of yarns and a plurality of elastic filaments 23. Specifically, the number of yarns in the elastic dense woven structure is preferably an even number of 6-48, and an equal number of yarns in two groups are diagonally woven along the outer periphery of the elastic inner tube 3, and the specification of each yarn is selected to be 200D-5000D. As shown in the figure, the two groups of yarns are a first yarn 21 of the first group and a second yarn 22 of the second group, and the first yarn 21 and the second yarn 22 are alternately interlaced from left to right and top to bottom, and each intersection forms an intersection point. The elastic filaments 23 are arranged in multiple, uniformly distributed around the outer periphery of the elastic inner tube 3, and each elastic filament 23 is parallel to the axial direction of the elastic inner tube 3. Figure 3 Figure 3 ​​​​​​As shown, each of the elastic filaments 23 is arranged at the cross-over point formed by the first yarn 21 and the second yarn 22 at the corresponding position, so that the plurality of elastic filaments 23 are distributed in parallel along the axial direction in the dense weaving layer and are covered by the dense weaving layer formed by the yarn weaving. The above-mentioned elastic dense weaving structure realizes limited radial expansion through the interlacing weaving of the two groups of equal number of yarns, and limits the expansion degree of the elastic inner tube 3 in the radial direction. At the same time, through the interlacing weaving structure arranged along the axial direction of the elastic inner tube 3 and through the cooperation of the elastic filaments 23, the elastic dense weaving structure can obtain the ability of limited elongation in the axial direction. The above-mentioned elastic dense weaving structure can realize limited radial expansion and limited elongation in the axial direction, and can provide the optimal protection for the elastic inner tube 3, especially the radial expansion limitation, which can enable the water pipe to be used in the high water pressure (0.6Mpa-1.0Mpa) scene and to achieve a longer service life.

[0072] In some feasible embodiments, the above-mentioned elastic dense weaving structure is formed by n number of elastic filaments 23 corresponding to 2n times the number of yarns outside the elastic inner tube 3, wherein n is a natural number, preferably 1 or 2. Then the number of elastic filaments 23 can be 1 / 2n. In actual production and application, the elastic filaments 23 can be cylindrical elastic filaments with a diameter of 0.25mm-2mm, and preferably the sizes of all the elastic filaments in the elastic dense weaving structure are the same. At the same time, the material of the elastic filaments 23 includes but is not limited to high-elasticity rubber filaments or latex filaments, and preferably the materials of all the elastic filaments in the elastic dense weaving structure are the same.

[0073] In some embodiments, the maximum axial elongation limit of the elastic weaving layer 2 can be adjusted by adjusting the angle α of the interlaced yarns during weaving, as shown in the following formula: Figure 3 As shown, the angle α is set to be less than 180 degrees, but not less than 120 degrees. In this range, the larger the value of α, the stronger the axial elongation ability of the elastic weaving layer 2. The preferred value of α is but not limited to 140 degrees, 145 degrees, 150 degrees and 160 degrees.

[0074] When the elastic weaving layer 2 adopts the above-mentioned elastic dense weaving structure, the new flat stretchable water pipe can obtain 1.05-3 times elongation, that is, the length in the elongated state is 1.05-3 times the length in the unelongated state.

[0075] In some embodiments, the elastic outer layer 1 is preferably made of a high-molecular elastic material, which includes but is not limited to thermoplastic elastomer TPR, thermoplastic elastomer TPE, TPV (thermoplastic vulcanized rubber), TPU (thermoplastic polyurethane rubber), SEBS thermoplastic elastomer, natural rubber or other synthetic rubber.

[0076] The use scene, use principle and use effect of the above-mentioned stretchable water pipe 100 will be specifically described below in combination with specific examples.

[0077] (I) The telescopic water pipe 100 is as follows: Figure 1 The flat telescopic water pipe shown is used in scenarios under low water pressure (0.2 MPa to 0.4 MPa):

[0078] The resilience K of the elastic inner tube 3 can be adjusted by adjusting the wall thickness of the flat elastic inner tube 3 and the tensile strength of the formulated material. The wall thickness of the elastic inner tube 3 can be set in a range that can withstand low water pressure, such as 0.5mm to 1.5mm, to meet the requirements of water pipes in actual use to withstand low water pressure and prevent damage to the inner tube.

[0079] The elasticity F of the elastic braided layer 2 can be adjusted by adjusting the number of yarns, yarn specifications, number of elastic filaments 23, and diameter of elastic filaments 23 in the above-mentioned elastic dense braided structure.

[0080] The rebound force L of the elastic outer layer 1 can be adjusted by adjusting the wall thickness of the elastic outer layer 1 and the tensile strength of the formula material. The wall thickness of the elastic outer layer 1 can be set in a relatively wear-resistant range, such as 0.5mm to 3mm, to meet the requirement that the water pipe will not be damaged by friction with the ground in actual use.

[0081] When L+F+K > 0, and the closer L+F+K is to 0, the smaller the fluid pressure required to expand the pipe from a flat structure to a near-circular structure while extending it axially to the set usable length. Based on this principle, the aforementioned telescopic pipe 100, which can be used in low-water-pressure scenarios, was manufactured. A specific example is provided below:

[0082] (1) Preparation of elastic inner tube 3: Using TPE low tensile strength formulation raw material, a flat elastic inner tube 3 is prepared by die structure design of extrusion equipment; the wall thickness a of V-shaped structure 31 is set to 0.8mm; the wall thickness b of connecting wall 32 is set to 0.5mm; the bending diameter D of elastic flat inner tube is 20mm and the flat height H is 4mm.

[0083] (2) The elastic braided layer 2 uses 7 elastic yarns 23, and the elastic yarns 23 are latex yarns with a diameter of 0.8mm; the yarn uses 28 high-strength polyester yarns of 800D, of which there are 14 first yarns 21 and 14 second yarns 22; after the elastic inner tube 3 is fully stretched to 5 times its original length, it is put into a special braiding machine (length stretched by 500%), and the elastic inner tube 3 is kept in a stretched state. Then the first yarn 21, the second yarn 22, and the elastic yarns 23 are put into the special braiding machine for weaving. During weaving, the angle α between the first yarn 21 and the second yarn 22 is set to 150 degrees, and the elastic yarns 23 are evenly distributed parallel to the axial direction of the surface of the elastic inner tube 3; in this way, the elastic braided layer 2 that restricts radial expansion and achieves limited axial elongation can be obtained, thereby obtaining a semi-finished product with the elastic braided layer 2 covering the surface of the elastic flat inner tube.

[0084] (3) The elastic outer layer 1 is made of TPR thermoplastic elastomer material. The wall thickness after extrusion is set to 0.8mm by the mold to ensure sufficient thickness to meet the requirement of not breaking due to friction with the ground in actual use of the water pipe. By adjusting the formula material, a low tensile strength formula TPR raw material is used to make the rebound force L of the elastic outer layer and the rebound force K of the elastic inner tube 3 a low value. An elastic inner tube 3 with an elastic braided layer 2 on the surface is coated with elastic outer layer glue by the extruder coating mold. After cooling and shaping, the elastic outer layer 1 is obtained, and finally the new flat telescopic water pipe 100 is obtained. The telescopic water pipe 100 is then equipped with connectors at both ends to make a new flat telescopic water pipe 100 that can be used in low water pressure scenarios (0.2Mpa~0.4Mpa) and at the same time meets the requirements of achieving a limited axial elongation of about 2 times and a long service life (wear resistance).

[0085] (II) The telescopic water pipe 100 is as follows: Figure 1 The flat telescopic water pipe shown is used in scenarios under high water pressure (0.6 MPa to 1.0 MPa):

[0086] Compared to scenario (1), the ability of the elastic inner tube 3 to withstand high water pressure can be adjusted by increasing the wall thickness of the elastic inner tube 3 and adjusting the tensile strength of the formula material. The wall thickness of the elastic inner tube 3 can be set to a relatively large thickness, such as 1.2mm to 5.0mm. The greater the tensile strength of the formula material and the thicker the tube wall, the stronger the high pressure resistance of the manufactured telescopic water pipe 100.

[0087] The radial and axial burst resistance values ​​of the elastic inner tube 3 are enhanced by adjusting the number of yarns, yarn specifications, number of elastic filaments 23, and diameter of elastic filaments 23 in the above-mentioned elastic dense braided structure. The more yarns and the larger the diameter, the greater the burst resistance value.

[0088] The elastic dense braided structure can limit the radial expansion of the elastic inner tube 3 and achieve limited axial elongation. The elastic dense braided structure is tightly wrapped on the outer surface of the elastic inner tube 3, so the characteristics of limiting radial expansion (also known as "lateral expansion") of the elastic dense braided structure greatly enhance the radial explosion-proof performance of the elastic inner tube 3, and the characteristics of limited axial elongation of the elastic dense braided structure also greatly enhance the axial explosion-proof performance of the compressible and foldable elastic inner tube 3. The axial elongation limit of the elastic dense braided structure can be adjusted by the size of the braided yarn α. In this way, a new type of flat and telescopic water pipe that meets the use in high water pressure scenes can be made. The following will be explained in combination with specific examples:

[0089] (1) Preparation of the elastic inner tube 3: The TPV high tensile strength formula raw material is used to prepare the flat structure of the elastic inner tube 3 through the mold structure design of the extrusion equipment; the wall thickness a of the V-shaped structure 31 is set to 2.5 mm; the wall thickness b of the connecting wall 32 is set to 2.0 mm; the folding diameter D of the elastic flat inner tube is 35 mm, and the flat height H is 7 mm.

[0090] (2) The number of elastic wires 23 in the elastic braided layer 2 is 24, and the elastic wires 23 are latex wires with a diameter of 1.5 mm; 48 high-strength polyester yarns with a diameter of 2200D are selected as the yarns, of which the first yarn 21 and the second yarn 22 are each 24; the elastic inner tube 3 is fully stretched to 3 times the original length and then loaded into a special braiding machine (length stretching 300%), and the stretched state of the elastic inner tube 3 is maintained, then the first yarn 21, the second yarn 22 and the elastic wire 23 are put into the special braiding machine for braiding, and the angle α of the first yarn 21 and the second yarn 22 is set to 140 degrees during braiding, and the elastic wire 23 is evenly distributed along the surface of the elastic inner tube 3 in the axial direction; in this way, the elastic braided layer 2 that can limit the radial expansion and achieve limited axial elongation can be prepared, so as to obtain the semi-finished product of the elastic flat inner tube with the elastic braided layer 2 wrapped on the surface.

[0091] (3) The elastic outer layer 1 adopts a high tensile strength formula natural latex coating process, and the elastic inner tube 3 with the elastic braided layer 2 on the surface is coated and wrapped multiple times and the wrapped rubber thickness reaches 2 mm, then it is dried and vulcanized to obtain the elastic outer layer 1, and finally the new type of flat and telescopic water pipe 100 is obtained. The two ends of the telescopic water pipe 100 are respectively provided with connectors, so as to obtain the new type of flat and telescopic water pipe 100 that can be used in high water pressure scenes (0.6Mpa-1.0Mpa) and at the same time can achieve limited axial elongation of about 1.5 times and long service life (wear resistance).

[0092] In summary, the telescopic water pipe 100 provided in the present application, the elastic woven layer 2 can be in close contact with the elastic inner tube 3 when the elastic inner tube 3 deforms in the radial and axial directions, and relative micro-sliding is allowed between the elastic inner tube 3 and the elastic woven layer 2 during the telescopic process of the water pipe; the elastic outer layer 1 is tightly adhered to the outer surface of the elastic woven layer 2, and the elastic outer layer 1 mainly serves as the outer protective layer of the water pipe, and is spaced from the elastic inner tube 3 by the elastic woven layer 2, and the two are not connected. In production, the elastic woven layer 2 is woven outside the elastic inner tube 3 in a stretched and thinned state, and then the elastic outer layer 1 is coated outside the elastic woven layer 2, and the diameter of the elastic inner tube 3 after returning to the natural state is larger than that of the elastic woven layer 2, so that the elastic woven layer 2 is tightly adhered to the outside of the elastic inner tube 3, and the two are fixed in close frictional contact. The elastic inner tube 3, the elastic woven layer 2 and the elastic outer layer 1 are tightly combined, and the three are basically synchronously stretched and retracted in the axial direction, and in the radial direction, due to the radial limitation of the elastic woven layer 2, the whole telescopic water pipe has limited radial elastic geometric deformation when stretched in the axial direction, and even slightly thins compared with the initial state.

[0093] The telescopic water pipe 100 provided in the present application can meet the diversified needs of users, has the characteristics of smaller storage volume, high pressure resistance, not easy to get dirty, wear-resistant, more environmentally friendly and water-saving, axial telescopic, long service life and the like, and has the following specific beneficial effects:

[0094] (1) High pressure resistance: the elastic woven layer with limited radial elasticity is tightly wrapped outside the elastic inner tube, which can provide optimal protection for the elastic inner tube;

[0095] (2) Not easy to get dirty and wear-resistant: the elastic outer layer is wrapped outside the elastic woven layer, which can protect the elastic woven layer and the elastic inner tube on the basis of meeting the radial and axial elastic deformation of the water pipe, prevent small sand and other foreign matters from entering the inside of the water pipe, and the elastic outer layer is made of thermoplastic elastomer such as synthetic rubber, natural rubber or TPR, which does not adhere to mud and sand and does not absorb water, and has the advantages of dirt resistance and wear resistance;

[0096] (3) Rapid elastic deformation, water-saving and more environmentally friendly: by using the elastic inner tube with radial geometric elasticity, the elastic deformation is rapid and the performance is good, the elastic inner tube adopts a flat structure, and the residual liquid in the pipe can be fully discharged when pressure relief, which is energy-saving and environmentally friendly;

[0097] (4) Small volume, easy to store and convenient to carry: the telescopic water pipe is flat as a whole, and is easy to store when not in use, and has small volume after storage, which is convenient to carry;

[0098] (5) Not easy to leak and long service life: The elastic outer layer does not damage the surface of the elastic inner tube when covering it. The elastic outer layer is not fused with the elastic inner tube. During the expansion and contraction of the telescopic water pipe, there is a slight slippage between the elastic inner tube and the elastic braided layer. The elastic braided layer has a high braiding density, which can maintain a large area of ​​contact with the elastic inner tube during the expansion and contraction of the water pipe. This can effectively resolve the strong tearing force of the moving yarn, prevent the yarn from tearing the elastic inner tube, provide the best protection for the elastic inner tube, and effectively extend the service life of the product.

[0099] Example 2

[0100] like Figure 6 to 8 As shown, this embodiment provides a novel telescopic water pipe 100, which differs from Embodiment 1 only in that: the elastic braided layer 2 in this embodiment adopts another dense braided layer with geometric deformation capability, namely, a diamond braided structure 4. The remaining structures of the telescopic water pipe 100 in this embodiment, including the structure (including shape and number of layers) and material of the elastic inner tube 3, the structure (including shape and number of layers) and material of the elastic outer layer 1, the interlayer bonding method between the elastic inner tube 3 and the elastic braided layer 2, and the interlayer bonding method between the elastic outer layer 1 and the elastic braided layer 2, are all the same as in Embodiment 1, and will not be described again here.

[0101] In some embodiments, the elastic braided layer 2 is generally applied after the elastic inner tube 3 has been stretched to a certain length (at which point the radial direction of the elastic inner tube 3 is compared to...). Figure 4 The initial state shown is somewhat contracted. The elastic inner tube 3 is covered with a braided layer 2 to ensure that the elastic braided layer 2 remains essentially in contact with the elastic inner tube 3 during expansion and contraction. Based on this, when fluid pressure is applied inside the elastic inner tube 3: radially, the elastic inner tube 3 can quickly expand from the limited radial elasticity range of the elastic braided layer 2. Figure 6 The flat structure shown is expanded to Figure 7 The near-circular structure shown, and the elastic braided layer 2 can limit the elastic inner tube 3 from reaching its full potential. Figure 7 After reaching the indicated state, it continues to expand radially; axially, the elastic inner tube 3 can achieve a limited elongation, while the elastic braided layer 2 and the elastic outer layer 1 also have a certain length of axial elongation under the friction of the elastic inner tube 3. Conversely, when the pressure inside the elastic inner tube 3 is released, radially, the elastic inner tube 3 can quickly return to its original state. Figure 6 The flat structure shown has an axial length in which the elastic inner tube 3, elastic braided layer 2, and elastic outer layer 1 can quickly contract and return to their initial axial length. During the expansion and contraction of the water pipe, there is micro-slippage between the elastic braided layer 2 and the elastic inner tube 3.

[0102] In some feasible embodiments, the aforementioned diamond-shaped braided structure 4 is formed by multiple looped yarns being woven together along the surface of the elastic inner tube 3 using a circumferential oblique weaving method, such as... Figure 7As shown, in the initial state, the diamond braid structure 4 closely adheres to the surface of the elastic inner tube 3 and is in a flat tubular shape. The number of yarns in the diamond braid structure 4 is preferably an even number of 6-48, and two groups of equal numbers of yarns are obliquely braided along the circumference. Each yarn is selected from yarns with a specification of 200D-5000D. Figure 8 As shown, the two groups of equal numbers of yarns are respectively the first loop yarn 41 of the first group and the second loop yarn 42 of the second group, which are alternately interlaced, and each intersection forms an intersection point. The diamond braid structure 4 realizes limited radial expansion through the circumferential oblique braiding of the two groups of equal numbers of yarns, and limits the expansion degree of the elastic inner tube 3 in the radial direction. At the same time, through the oblique braiding structure arranged along the axial direction of the elastic inner tube 3, the diamond braid structure 4 can obtain the ability to stretch in the axial direction within a limited range, so as to produce a substantially synchronous geometric deformation according to the elongation or shortening of the elastic inner tube 3. The diamond braid structure 4 can realize limited radial expansion and limited axial stretching, and can provide optimal protection for the elastic inner tube 3, especially the radial expansion limitation, which can enable the water pipe to be used in a high water pressure (0.6Mpa-1.0Mpa) scenario and achieve a longer service life.

[0103] In some embodiments, the maximum axial stretching limit of the diamond braid structure 4 can be adjusted by adjusting the oblique intersection angle β between the loop yarns during braiding, as shown in the following figure. Figure 8 As shown, the angle β is set to be less than 180 degrees, but not less than 120 degrees. Within this range, the larger the value of β, the stronger the axial stretching ability of the diamond braid structure 4. The preferred value of β can be, but is not limited to, 130 degrees, 140 degrees, and 150 degrees.

[0104] When the elastic braid layer 2 adopts the diamond braid structure 4 described above, the new flat stretchable water pipe can have an elongation of 1.05-2.5 times, i.e., the length in the stretched state is 1.05-2.5 times the length in the un-stretched state.

[0105] The following will describe the use scenario, use principle, and use effect of the stretchable water pipe 100 of the present embodiment in combination with specific examples.

[0106] (I) Use the stretchable water pipe 100 in a water pressure scenario of 0.3Mpa-0.8Mpa:

[0107] (1) Preparation of the elastic inner tube 3: A flat-structured elastic inner tube 3 is prepared by using TPR medium tensile strength formula raw materials through the mold structure design of the extrusion equipment; the wall thickness a of the V-shaped structure 31 is set to 1.2mm; the wall thickness b of the connecting wall 32 is set to 1.0mm, the folded diameter D of the elastic flat inner tube is 25mm, and the flat height H is 5mm.

[0108] (2) The elastic braided layer 2 adopts a diamond braided structure 4, which is specifically formed by 12 1000D polyester high-strength yarns being circularly interwoven along the surface of the elastic inner tube 3 by a special circular knitting machine. The diamond braided structure 4 includes 6 first circular yarns 41 and 6 second circular yarns 42. The first circular yarns 41 and the second circular yarns 42 form a flat gap in the axial direction of the elastic inner tube 3, so that the diamond braided structure 4 can be stretched to a limited extent in the axial direction and expanded to a limited extent in the radial direction. An oblique intersection angle β is formed between the first circular yarns 41 and the second circular yarns 42. The greater the value of β, the stronger the axial geometric deformation elongation capability of the diamond braided structure 4. The angle β is set to 135 degrees, and the diamond braided structure 4 can be geometrically deformed by about 1.3 times with the elongation or shortening of the elastic inner tube 3.

[0109] (3) The elastic outer layer 1 adopts a medium tensile strength formula synthetic latex coating process. The elastic inner tube 3 with the diamond braided structure 4 on the surface is coated and covered multiple times, and the coating thickness reaches 1.0 mm, which ensures sufficient thickness to meet the requirement of not being damaged by ground friction in actual use of the water pipe. The coated synthetic latex is dried, vulcanized, and shaped to obtain the elastic outer layer 1, and finally the new type of flat stretchable water pipe 100 is obtained. The stretchable water pipe 100 is provided with a connector at each end, so that the new type of flat stretchable water pipe 100 can be used in a high or low water pressure scene of 0.3Mpa-0.8Mpa, and at the same time, the axial limited elongation of 1.3 times and long service life (wear resistance) can be realized.

[0110] (II) The stretchable water pipe 100 is used in a high water pressure scene of 0.6Mpa-1.0Mpa:

[0111] (1) Preparation of the elastic inner tube 3: PVC high-elastic material is used to prepare the flat structure of the elastic inner tube 3 through the mold structure design of the extrusion equipment. The wall thickness a of the V-shaped structure 31 is set to 1.8 mm, and the wall thickness b of the connecting wall 32 is set to 1.5 mm. The folded diameter D of the elastic flat inner tube is 30 mm, and the flat height H is 7 mm.

[0112] (2) The elastic braided layer 2 adopts a diamond braided structure 4, which is specifically formed by 24 1600D polyester high-strength yarns being circularly interwoven along the surface of the elastic inner tube 3 by a special circular knitting machine. The diamond braided structure 4 includes 12 first circular yarns 41 and 12 second circular yarns 42. The first circular yarns 41 and the second circular yarns 42 form a flat gap in the axial direction of the elastic inner tube 3, so that the diamond braided structure 4 can be stretched to a limited extent in the axial direction and expanded to a limited extent in the radial direction. An oblique intersection angle β is formed between the first circular yarns 41 and the second circular yarns 42. The greater the value of β, the stronger the axial geometric deformation elongation capability of the diamond braided structure 4. The angle β is set to 130 degrees, and the diamond braided structure 4 can be geometrically deformed by about 1.05 times with the elongation or shortening of the elastic inner tube 3.

[0113] (3) The elastic outer layer 1 adopts a TPV high tensile strength formula material, and the wall thickness thereof is set to 1.2 mm through a mold after extrusion, so as to ensure sufficient thickness and strength to meet the demand of the water pipe in actual use for not being damaged by ground friction. An elastic inner tube 3 with a rhombic woven structure 4 on a surface is coated with an elastic outer layer glue through an extruder coating mold, and the new type of flat telescopic water pipe 100 is obtained after cooling and setting. The telescopic water pipe 100 is respectively provided with a connector at two ends, so as to be used in a high water pressure scene (0.6 Mpa-1.0 Mpa), and at the same time, the telescopic water pipe 100 meets the realization of axial limited elongation 1.05 times and long service life (wear resistance).

[0114] It can be seen that the telescopic water pipe 100 provided by the scheme can meet the diversified needs of users, has smaller storage volume, high pressure resistance, is not easy to get dirty, is wear-resistant, is more environmentally friendly and water-saving, has axial telescopic, long service life and other characteristics, and has the following specific beneficial effects:

[0115] (1) High pressure resistance: the elastic woven layer with limited radial elasticity is tightly coated outside the elastic inner tube, which can provide optimal protection for the elastic inner tube;

[0116] (2) Not easy to get dirty and wear-resistant: the elastic outer layer is coated outside the elastic woven layer, which can protect the elastic woven layer and the elastic inner tube on the basis of meeting the radial and axial elastic deformation of the water pipe, prevent small sand and other foreign matters from entering the inside of the water pipe, and the elastic outer layer is made of thermoplastic elastomers such as synthetic rubber, natural rubber or TPR, which does not adhere to mud and sand and does not absorb water, and has the advantages of dirt resistance and wear resistance;

[0117] (3) Rapid elastic deformation, energy-saving and environmentally friendly: the elastic inner tube with radial geometric elasticity is used, which has rapid elastic deformation and good use performance, and the elastic inner tube adopts a flat structure, which can fully drain the residual liquid in the pipe when pressure relief, thereby saving energy and being environmentally friendly;

[0118] (4) Small volume, easy to store and convenient to carry: the telescopic water pipe is flat as a whole, which is easy to store when not in use, and has small volume after storage, thereby being convenient to carry;

[0119] (5) Not easy to leak and long service life: the elastic outer layer does not damage the surface of the elastic inner tube, the elastic outer layer is not connected with the elastic inner tube, there is allowed to be micro-sliding between the elastic inner tube and the elastic woven layer during the telescopic process of the telescopic water pipe, the elastic woven layer has large weaving density, and can basically keep large-area contact with the elastic inner tube during the telescopic process of the water pipe, thereby effectively resolving the strong tearing force of the moving yarn, avoiding the yarn tearing the elastic inner tube, providing optimal protection for the elastic inner tube, and effectively prolonging the service life of the product.

[0120] Example 3

[0121] AsFigure 13 As shown in the drawings, the present embodiment proposes a method for preparing the telescopic water pipe 100 in Embodiment 1 or Embodiment 2, which mainly comprises the following steps:

[0122] I. Preparation of the elastic inner tube 3: the elastic inner tube 3 is prepared by using a special extruder matched with a special inner tube mold, and is directly extruded and formed. If the elastic inner tube 3 is a flat tube as shown in Figure 1 、 Figure 4 、 Figure 5 and Figure 6 , the inner tube mold is a special flat inner tube mold matched in shape to extrude the flat elastic inner tube.

[0123] II. Preparation of the elastic braid layer 2 outside the elastic inner tube 3: the extruded and formed elastic inner tube 3 is covered with the elastic braid layer 2 outside the elastic inner tube 3 in a stretched state by using a special braiding machine. The braiding machine is a finished braiding machine, and different types of braiding machines can be selected according to different braiding structures of the elastic braid layer 2. The braiding layer 2 can be the elastic composite structure dense braid layer in Embodiment 1, or the diamond braid structure dense braid layer in Embodiment 2.

[0124] III. Preparation of the elastic outer layer 1 outside the elastic braid layer 2: the elastic inner tube 3 covered with the elastic braid layer 2 is extruded or coated to form the elastic outer layer 1 on the surface (i.e. the outer surface of the elastic braid layer 2), at this time, the elastic outer layer 1 is tightly combined with the elastic braid layer 2, and the two are bonded by using the solidification process (from liquid to solid) of the elastic outer layer 1 material in the extrusion or coating process of the elastic outer layer 1. Thus, the interlayer combination of the elastic inner tube 3, the elastic braid layer 2 and the elastic outer layer 1 is realized, and the preparation of the telescopic water pipe 100 is completed. It should be noted that the telescopic water pipe 100 prepared but not yet put into use mainly depends on the shape of the elastic inner tube 3, if the elastic inner tube 3 is extruded as a round tube, the telescopic water pipe 100 is a telescopic round tube, and if the elastic inner tube 3 is extruded as a flat tube as shown in Figure 1 、 Figure 4 、 Figure 5 and Figure 6 , the telescopic water pipe 100 is a telescopic flat tube, and the specific structure is shown in Figure 1 and Figure 6 .

[0125] In actual operation, the preparation method of the telescopic water pipe 100 can be implemented by using a telescopic water pipe preparation system, such as Figure 13As shown, the telescopic water pipe preparation system comprises an elastic inner tube extruder 5, a cooling box I 6, a braiding machine 7, an elastic outer layer covering machine 8 and a cooling box II 9. The elastic inner tube extruder 5 is used for the extrusion molding of the elastic inner tube 3, the cooling box I 6 is mainly used for cooling the elastic inner tube 3, the braiding machine 7 is used for braiding the elastic braided layer 2 outside the elastic inner tube 3, the elastic outer layer covering machine 8 is used for preparing the elastic outer layer 1 outside the elastic braided layer 2, and the cooling box II 9 is used for the cooling and shaping of the elastic outer layer 1. The above-mentioned elastic inner tube extruder 5, cooling box I 6, braiding machine 7, elastic outer layer covering machine 8 and cooling box II 9 all adopt mature finished products, and details are not described here.

[0126] Embodiment 4

[0127] The embodiment proposes a preparation method of the telescopic water pipe 100 in Embodiment 1 or Embodiment 2, which is mainly different from Embodiment 3 in that the elastic outer layer 1 can be prepared by an extruder alone to form, after the preparation of the elastic outer layer 1, the corresponding tool or machine is used to sleeve the elastic outer layer 1 on the surface of the elastic inner tube 3 (i.e. the outer surface of the elastic braided layer 2) which has been covered with the elastic braided layer 2, and glue is poured between the elastic outer layer 1 and the elastic braided layer 2 for bonding.

[0128] Embodiment 5

[0129] The embodiment proposes a water pipe assembly 200 which comprises the telescopic water pipe 100 disclosed in Embodiment 1 or Embodiment 2, and at least one end of the telescopic water pipe 100 is configured to be mounted with a connector. The connector can be a water inlet connecting device to connect the telescopic water pipe 100 with a faucet, or can be a water outlet connecting device to connect the telescopic water pipe 100 with a ball valve or a water gun, etc. The outer interface of the connector can adopt a quick connector interface or an external screw thread interface or an internal screw thread interface to realize quick installation and use.

[0130] In some embodiments, only one end of the telescopic water pipe 100 is configured to be mounted with a connector, which can be one of an internal screw thread interface 300, a ball valve water outlet 400 and a quick connector 500. The internal screw thread interface 300, the ball valve water outlet 400 and the quick connector 500 are all common finished products, which are generally inserted outside the elastic outer layer 1 of the telescopic water pipe 100, and the specific structure and use principle are not described here.

[0131] In some embodiments, both ends of the telescopic water pipe 100 can be configured to be mounted with connectors. The connectors at both ends of the telescopic water pipe 100 can be completely the same, or different connectors can be configured at both ends of the telescopic water pipe 100 according to the different connection positions or uses of the water pipe. The connectors at each end of the telescopic water pipe 100 can be one of the internal screw thread interface 300, the ball valve water outlet 400 and the quick connector 500. For example, Figure 9 As shown, the telescopic water pipe 100 is configured to be mounted with an internal screw thread interface 300 and a ball valve water outlet 400 at both ends; as shown,Figure 10 As shown, the two ends of the telescopic water pipe 100 are respectively configured with a ball valve water outlet 400 and a quick connector 500; as Figure 11 As shown, the two ends of the telescopic water pipe 100 are respectively configured with a ball valve water outlet 400 and a quick connector 500; as

[0132] When the water pipe assembly 200 is not in use, it is generally coiled and stored, as Figure 12 As shown. Due to the flat tubular design of the elastic inner tube 3, the telescopic water pipe 100 is in a flat structure in the internal emptying state, and based on this, after coiling the water pipe assembly 200, compared with the traditional same length of the circular pipe water pipe structure, the coil volume can be reduced, thereby saving the storage space of the water pipe assembly 200, and improving the portability and use flexibility of the water pipe assembly 200.

[0133] The above water pipe assembly 200 has all the features of the telescopic water pipe 100 described above, and will not be described here.

[0134] It should be understood that the structures, proportions, sizes, etc. shown in the drawings of the present specification are only used to cooperate with the disclosed content, to enable those skilled in the art to understand and read, and are not used to limit the implementation conditions of the present application, so they do not have technical significance. Any modification of the structure, change of the proportional relationship or adjustment of the size, without affecting the effect and purpose of the present application, should still fall within the scope of the disclosed technical content. At the same time, the terms such as "up", "down", "left", "right", "middle" and "one" in the present specification are only for clear description, and are not used to limit the scope of the present application. The change or adjustment of the relative relationship, without substantially changing the technical content, is also considered as the implementation range of the present application.

[0135] The principles and implementation methods of the present application are described in the specific examples in the present application. The above examples are only used to help understand the method and core idea of the present application; at the same time, for those skilled in the art, according to the idea of the present application, the specific implementation method and application range will be changed. In conclusion, the content of the present specification should not be understood as a limitation of the present application.

Claims

1. A retractable hose, characterized in that, The utility model relates to a kind of flexible pipe, including: Elastic inner tube (3) has drainage channel inside;Said elastic inner tube (3) is provided with at least one layer, and the elastic inner tube (3) can be axially extended and radially elastically deformed when fluid pressure is introduced into the drainage channel, and can be axially shortened and radially restored when the drainage channel is depressurized;When there is no fluid pressure passing through the elastic inner tube (3), the elastic inner tube (3) is flat tubular; Elastic braided layer (2) is tightly sleeved outside the elastic inner tube (3), the radial circumference of the elastic inner tube (3) is greater than the radial inner circumference of the elastic braided layer (2), the elastic inner tube (3) and the elastic braided layer (2) are in interference fit, and the elastic braided layer (2) can be axially extended and contracted under the driving of the elastic inner tube (3) when the elastic inner tube (3) is axially extended and contracted, and can limit the radial expansion of the elastic inner tube (3) when the elastic inner tube (3) is radially elastically deformed. Elastic outer layer (1) is tightly sleeved outside the elastic braided layer (2) and is spaced from the elastic inner tube (3) by the elastic braided layer (2);Said elastic outer layer (1) is provided with at least one layer, and the elastic outer layer (1) can be deformed synchronously with the elastic braided layer (2).

2. The flexible hose of claim 1, wherein When the elastic inner tube (3) is flat tubular, the tube wall thereof comprises V-shaped structures (31) on both sides and connecting walls (32), the openings of the V-shaped structures (31) on both sides are oppositely arranged, and the openings of the two V-shaped structures (31) are connected by one connecting wall (32) at each end, and the wall thickness a of the V-shaped structure (31) is not less than the thickness b of the connecting wall (32).

3. The flexible hose of claim 2, wherein, The elastic inner tube (3) is integrally extruded, and when the elastic inner tube (3) is flat tubular, the distance D between the tips of the two V-shaped structures (31) is 10-100 mm, and the distance H between the outer sides of the two connecting walls (32) is 1.2-12 mm.

4. A hose according to claim 2 or 3, characterised in that The wall thickness a of the V-shaped structure (31) is greater than the thickness b of the connecting wall (32), and a is 0.6-5 mm and b is 0.5-3 mm.

5. The hose according to any one of claims 1 to 3, wherein The elastic outer layer (1) is coated or extruded outside the elastic braided layer (2).

6. The flexible water hose according to any one of claims 1 to 3, characterized in that The elastic outer layer (1) is a thermoplastic elastomer structure, a natural rubber structure or a synthetic rubber structure, and the elastic inner tube (3) is a thermoplastic elastomer structure, a natural rubber structure or a synthetic rubber structure.

7. The flexible water hose according to any one of claims 1 to 3, wherein The elastic woven layer (2) is an elastic dense woven structure woven outside the elastic inner tube (3) in the stretched state of the elastic inner tube (3), the elastic dense woven structure is woven by a first yarn (21), a second yarn (22) and a plurality of elastic filaments (23), wherein the number of the first yarn (21) and the second yarn (22) is the same, and the first yarn (21) and the second yarn (22) are diagonally woven along the outer periphery of the elastic inner tube (3), a plurality of the elastic filaments (23) are uniformly distributed on the outer periphery of the elastic inner tube (3), and any one of the elastic filaments (23) is parallel to the axial direction of the elastic inner tube (3); any one of the elastic filaments (23) is arranged at the cross-interlacing point formed by the first yarn (21) and the second yarn (22) at the corresponding position.

8. The flexible hose of claim 7, wherein, The diagonal angle of the first yarn (21) and the second yarn (22) is α, 120°≤ α < 180°.

9. The flexible water hose according to any one of claims 1 to 3, characterized in that The elastic woven layer (2) is a diamond woven structure (4) woven outside the elastic inner tube (3) in the stretched state of the elastic inner tube (3), the diamond woven structure (4) is woven by a first ring yarn (41) and a second ring yarn (42) diagonally along the circumference of the elastic inner tube (3), wherein the number of the first ring yarn (41) and the second ring yarn (42) is the same.

10. The flexible hose of claim 9, wherein, The diagonal angle of the first ring yarn (41) and the second ring yarn (42) is β, 120°≤ β < 180°.

11. A water pipe assembly, characterized by The stretchable water pipe (100) comprises a joint arranged at least one end of the stretchable water pipe (100); the joint is an internal thread interface (300), a ball valve water outlet (400) or a quick connector (500).

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