Knitted rubber hose and method for extending service life of knitted rubber hose

Abstract

The present invention provides a knitted rubber hose provided with a skeleton layer and a method for extending the service life of the knitted rubber hose, which relates to the technical field of knitted rubber hoses and solves the technical problem in the prior art that the knitted rubber hose is easily deformed under the action of internal pressure, causing the fracture of the skeleton layer material and having a low service life. The knitted rubber hose comprises an inner tube body, a skeleton layer and an outer tube body; wherein the stiffness of the skeleton layer is greater than the stiffness of the inner tube body and the outer tube body, the skeleton layer comprises at least two rows of knitted thread bodies in the axial direction of the knitted rubber hose, two adjacent rows of knitted thread bodies are spirally wound to form a row of knitting units, each row of the knitting units comprises at least two knitted grids, and when there is internal pressure in the inner tube body, the knitted grids are subjected to equal forces in the width and length directions so that the skeleton layer is subjected to equal forces in the circumferential and axial directions. The present invention is used to provide a knitted rubber hose with uniform axial and circumferential forces and a long service life.

Description

Technical Field

[0001] The invention relates to the technical field of knitted rubber hoses, in particular to a knitted rubber hose provided with a skeleton layer and a method for extending the service life of the knitted rubber hose. Background Art

[0002] Knitted structural hoses are commonly used in the fields of automotive cooling hose systems, turbocharger hose systems, etc. As users of knitted hoses, automobile OEMs and engine manufacturers have put forward corresponding standard requirements for the use of knitted hoses, and knitted hose manufacturers provide products that meet the standard requirements. From the inside to the outside, the knitted hose includes an inner tube body, a skeleton layer, and an outer tube body; when the knitted hose is used, pressure (also called internal pressure) will be generated on the tube wall after liquid is passed into the inside. The skeleton layer is mainly used to withstand the internal pressure. The skeleton layer is a grid-like structure, and under the action of the internal pressure, its length and width directions can generate interaction forces to prevent the knitted hose from breaking.

[0003] The applicant has found that the knitted rubber hose in the prior art is easily deformed under the action of internal pressure, causing the skeleton layer material to break, and the service life is relatively short. Summary of the invention

[0004] The purpose of the present invention is to provide a knitted rubber hose provided with a skeleton layer and a method for extending the service life of the knitted rubber hose, so as to solve the technical problem that the knitted rubber hose in the prior art is easy to deform under the action of internal pressure, resulting in the fracture of the skeleton layer material and a low service life. The various technical effects that can be produced by the preferred technical solution among the various technical solutions of the present invention are described in detail below.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] The knitted rubber hose provided in the embodiment of the present invention comprises an inner tube body, a skeleton layer and an outer tube body; wherein:

[0007] The inner tube body, the skeleton layer and the outer tube body are all in the shape of circular tubes, the rigidity of the skeleton layer is greater than that of the inner tube body and the outer tube body, the outer wall surface of the inner tube body abuts against the inner wall surface of the skeleton layer, the outer wall surface of the skeleton layer abuts against the inner wall surface of the outer tube body, and the axial dimension of the skeleton layer is not greater than the axial dimension of the inner tube body and the outer tube body;

[0008] The skeleton layer includes at least two rows of knitted threads in the axial direction of the knitted rubber hose, and two adjacent rows of knitted threads are spirally wound to form a row of knitted units. Each row of the knitted units includes at least two knitted grids. The width of the knitted grid is the size of the knitted grid in the circumferential direction of the knitted rubber hose, and the length of the knitted grid is the size of the knitted grid along the axial direction of the knitted rubber hose. When there is internal pressure in the inner tube body, the knitted grid is subjected to equal forces in the width and length directions, so that the skeleton layer is subjected to equal forces in the circumferential and axial directions.

[0009] In a preferred or optional embodiment, the axial dimensions of the inner tube body and the skeleton layer are not greater than the axial dimensions of the outer tube body.

[0010] In a preferred or optional embodiment, the size of each of the knitted meshes satisfies: w / h=tan54.73°, wherein w represents the width of the knitted mesh, and h represents the length of the knitted mesh.

[0011] In a preferred or optional embodiment, within a length of 1 cm, the number N of the knitted threads satisfies: Wherein, D represents the outer diameter of the skeleton layer of the knitted rubber hose, P represents the bursting pressure, k represents the strength of the knitted thread, i represents the number of layers of the skeleton layer along the radial direction of the knitted rubber hose, C1 is the correction coefficient, and C2 represents the breaking elongation of the knitted thread.

[0012] In a preferred or optional embodiment, the correction coefficient C1 has a value range of 0.8 to 0.9.

[0013] In a preferred or optional embodiment, the length of each of the knitted meshes satisfies: Wherein, C3 represents the tension coefficient of the knitted hose skeleton layer.

[0014] In a preferred or optional embodiment, the width of each of the knitted meshes satisfies: The tension coefficient C3 of the knitted rubber hose skeleton layer has a value range of 0.8 to 0.9.

[0015] In a preferred or optional embodiment, the through hole diameter of the needle guide rail of the knitting machine for manufacturing the skeleton layer satisfies:

[0016]

[0017] ; Wherein, y represents the height of the knitting needle and T represents the wall thickness of the needle guide.

[0018] A method for extending the service life of a knitted rubber hose as provided by any technical solution of the present invention comprises selecting the length and width of the knitted mesh so that the axial and circumferential forces on the skeleton layer of the knitted rubber hose are equal.

[0019] In a preferred or optional embodiment, the method of selecting the length and width dimensions of the knitted mesh comprises the following steps:

[0020] a) calculating the number N of the knitted yarn within a length of 1 cm;

[0021] b) calculating the length h and width w of each knitted grid;

[0022] c) Calculate the number of needles n required to make a row of knitting units;

[0023] d) calculating the length of each knitting thread and the length of the thread consumed by the knitting machine after knitting one knitting unit;

[0024] e) Calculate the hole diameter d of the needle guide required to manufacture a row of knitting units.

[0025] Based on the above technical solution, the embodiments of the present invention can at least produce the following technical effects:

[0026] The knitted rubber hose provided by the present invention comprises an inner tube body, a skeleton layer and an outer tube body. Since the stiffness of the skeleton layer is greater than that of the inner tube body and the outer tube body, the skeleton layer is mainly used to withstand pressure. The skeleton layer is formed by spirally winding two adjacent rows of knitted wire bodies. Therefore, the long side and the wide side of each knitted grid are staggered. When there is internal pressure in the inner tube body, the long side and the wide side of the knitted grid generate interaction force to jointly bear the internal pressure in the inner tube body. The knitted grid is subjected to equal force in the width and length directions, so that the skeleton layer is subjected to uniform force in the circumferential and axial directions, is not easily deformed, and the service life of the knitted rubber hose is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0028] Figure 1 This is a schematic diagram of the structure of a knitted rubber hose provided in an embodiment of the present invention;

[0029] Figure 2 This is a schematic diagram of the development of a knitted rubber hose skeleton layer provided in an embodiment of the present invention;

[0030] Figure 3 A schematic diagram of a needle guide rail for a knitting machine provided in an embodiment of the present invention;

[0031] Figure 4 for Figure 3The front view of the needle guide rail is shown;

[0032] Figure 5 A schematic diagram of the covering angle of the skeleton layer of the knitted rubber hose provided in an embodiment of the present invention;

[0033] Figure 6 It is a schematic diagram of the force of the knitted mesh provided in an embodiment of the present invention.

[0034] In the figure, 1, inner tube body; 2, skeleton layer; 21, knitting thread body; 22, knitting unit; 23, knitting grid; 3, outer tube body; 4, needle guide; 41, through hole; 5, knitting needle. DETAILED DESCRIPTION

[0035] To make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be described in detail below. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other implementation methods obtained by ordinary technicians in this field without creative work belong to the scope of protection of the present invention.

[0036] The invention provides a knitted rubber hose which is not easily deformed and has a long service life.

[0037] Combine the following Figure 1 to Figure 6 The technical solution provided by the present invention is described in more detail.

[0038] like Figure 1 to Figure 6 As shown, the knitted rubber hose provided in the embodiment of the present invention comprises an inner tube body 1, a skeleton layer 2 and an outer tube body 3; wherein,

[0039] The inner tube body 1, the skeleton layer 2 and the outer tube body 3 are all in the shape of a circular tube, the rigidity of the skeleton layer 2 is greater than that of the inner tube body 1 and the outer tube body 3, the outer wall surface of the inner tube body 1 abuts against the inner wall surface of the skeleton layer 2, the outer wall surface of the skeleton layer 2 abuts against the inner wall surface of the outer tube body 3, and the axial dimension of the skeleton layer 2 is not greater than the axial dimension of the inner wall surfaces of the inner tube body 1 and the outer tube body 3 abutting against each other;

[0040] The skeleton layer 2 includes at least two rows of knitted threads 21 in the axial direction of the knitted hose. Two adjacent rows of knitted threads 21 are spirally wound to form a row of knitted units 22. Each row of knitted units 22 includes at least two knitted grids 23. The width of the knitted grid 23 is the size of the knitted grid 23 in the circumferential direction of the knitted hose. The length of the knitted grid 23 is the size of the knitted grid 23 along the axial direction of the knitted hose. When there is internal pressure in the inner tube body 1, the knitted grid 23 is subjected to equal forces in the width and length directions, so that the skeleton layer 2 is subjected to equal forces in the circumferential and axial directions.

[0041] The knitted rubber hose provided by the present invention comprises an inner tube body 1, a skeleton layer 2 and an outer tube body 3. Since the stiffness of the skeleton layer 2 is greater than that of the inner tube body 1 and the outer tube body 3, the skeleton layer 2 is mainly used to withstand pressure; the skeleton layer 2 is formed by spirally winding two adjacent rows of knitted wire bodies 21, so the long side and the wide side of each knitted grid 23 are staggered. When there is internal pressure in the inner tube body 1, the long side and the wide side of the knitted grid 23 generate interaction force to jointly bear the internal pressure in the inner tube body 1. The knitted grid 23 is subjected to equal force in the width and length directions, so that the skeleton layer 2 is subjected to uniform force in the circumferential and axial directions, is not easily deformed, and the service life of the knitted rubber hose is improved; at the same time, a large number of tests required to improve the knitted hose material are avoided, saving research and development costs.

[0042] As a preferred or optional embodiment, the axial dimensions of the inner tube body 1 and the skeleton layer 2 are not greater than the axial dimensions of the outer tube body 3 .

[0043] As a preferred or optional implementation, the size of each of the knitted meshes satisfies: w / h=tan54.73°, wherein w represents the width of the knitted mesh, and h represents the length of the knitted mesh.

[0044] like Figure 5 As shown in the schematic diagram of the wrapping angle of the knitted hose skeleton layer, the elastic forces on the longitudinal section and cross section of the knitted hose are: F1 = PD1L / 2; F2 = PπD1 2 / 4; where F1 is the elastic force in the circumferential direction, F2 is the elastic force in the axial direction, D1 is the diameter of the knitted hose, and L is the pitch (stroke) of the covering. When the angle α between the resultant force of the circumferential stress value and the axial stress value is equal to the covering angle, the length and diameter of the knitted hose remain unchanged under the action of the internal pressure. According to tanα=πD1 / L=F1 / F2, Get tanα 2 =2, α=54.73°. At this time, under the action of internal pressure, the circumferential pressure and axial pressure of the hose are equal, so that the material of the skeleton layer 2 can achieve the best utilization rate.

[0045] As a preferred or optional embodiment, within a length of 1 cm, the number N of knitted threads 21 satisfies: Wherein, D represents the outer diameter of the skeleton layer of the knitted rubber hose, P represents the bursting pressure, k represents the strength of the knitted thread, i represents the number of layers of the skeleton layer along the radial direction of the knitted rubber hose, C1 is the correction coefficient, and C2 represents the breaking elongation of the knitted thread.

[0046] according to Figure 6As shown in the force diagram of the knitted mesh, when the resultant angle of the circumferential force and the axial force on the mesh is 54.73° and the diagonal points are in the same straight line, the length and diameter of the knitted rubber hose remain unchanged under the internal pressure, the circumferential pressure is equal to the axial pressure, and the material utilization rate of the skeleton layer 2 is optimal;

[0047] The bursting pressure calculation formula of knitted hose have to

[0048] As a preferred or optional implementation, the correction coefficient C1 has a value range of 0.8 to 0.9.

[0049] Preferably, the value of a single-layer skeleton layer is generally 0.85.

[0050] As a preferred or optional embodiment, the length of each of the knitted meshes 23 satisfies: Wherein, C3 represents the tension coefficient of the knitted hose skeleton layer 2.

[0051] Specifically, Wherein, N represents the number of knitted yarns 21, (N-1) represents the number of knitted units 22, multiplied by 10 represents the conversion from centimeters to millimeters, and multiplied by C3 represents the height of the knitted grid 23 in the relaxed state, so

[0052]

[0053] As a preferred or optional embodiment, the width of each of the knitted grids 23 satisfies: The tension coefficient C3 of the knitted hose skeleton layer 2 has a value range of 0.8 to 0.9.

[0054] Specifically, w = h × tanα, so,

[0055] As a preferred or optional embodiment, the aperture of the through hole 41 of the needle guide rail 4 of the knitting machine for manufacturing the skeleton layer 2 satisfies:

[0056]

[0057] ; Wherein, y represents the height of the knitting needle and T represents the wall thickness of the needle guide.

[0058] like Figure 2 Schematic diagram of knitted hose skeleton layer expansion and Figure 4 As shown in the front schematic diagram of the needle guide rail, the knitting needle 5 reciprocates in the needle guide rail 4 to perform the thread hooking action to complete the processing of the skeleton layer 2; wherein, πD = 2wn, then The length of each knitted thread 21 is The thread length consumed by the knitting machine to weave one knitting unit 22 is The length of each knitting thread 21 is equal to the thread length consumed by the knitting machine after knitting one knitting unit 22.

[0059]

[0060] The diameter of the through hole 41 of the needle guide rail 4 of the knitting machine is obtained as follows:

[0061]

[0062] A method for extending the service life of a knitted rubber hose provided by any technical solution of the present invention comprises selecting the length and width of the knitted mesh 23 so that the axial and circumferential forces on the skeleton layer 2 of the knitted rubber hose are equal.

[0063] As a preferred or optional embodiment, the method for selecting the length and width dimensions of the knitted mesh 23 comprises the following steps:

[0064] a) calculating the number N of the knitted yarn within a length of 1 cm;

[0065] b) calculating the length h and width w of each knitted grid;

[0066] c) Calculate the number of needles n required to make a row of knitting units;

[0067] d) calculating the length of each knitting thread 21 and the thread length consumed by the knitting machine after knitting one knitting unit 22;

[0068] e) Calculate the hole diameter d of the needle guide required to manufacture a row of knitting units.

[0069] Unless otherwise stated, any technical solution disclosed in the present invention disclosed above, if it discloses a numerical range, then the disclosed numerical range is a preferred numerical range, and any technician in the field should understand that the preferred numerical range is only a numerical value with a more obvious technical effect or representative value among many implementable numerical values. Since there are too many numerical values ​​to be exhaustive, the present invention discloses some numerical values ​​to illustrate the technical solution of the present invention, and the numerical values ​​listed above should not constitute a limitation on the scope of protection of the present invention.

[0070] If the words "first", "second" and so on are used in this article to limit components, those skilled in the art should know that the use of "first" and "second" is only for the convenience of description to distinguish the components. Unless otherwise stated, the above words have no special meaning.

[0071] Meanwhile, if the above invention discloses or involves mutually fixedly connected parts or structural parts, then, unless otherwise stated, the fixed connection can be understood as: a detachable fixed connection (for example, connection using bolts or screws), or as: a non-detachable fixed connection (for example, riveting, welding). Of course, the mutually fixed connection can also be an integrated structure (for example, one-piece manufacturing using a casting process) (except where it is obviously impossible to use an integrated molding process).

[0072] In addition, the terms used in any technical solution disclosed in the present invention to indicate positional relationships or shapes include states or shapes that are similar, similar or close to them unless otherwise stated. Any component provided by the present invention may be assembled from multiple separate components or may be a separate component manufactured by an integrated molding process.

[0073] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, ordinary technicians in the field should understand that the specific implementation methods of the present invention can still be modified or some technical features can be replaced by equivalents without departing from the spirit of the technical solution of the present invention, which should be included in the scope of the technical solution for protection of the present invention.

Claims

1. A knitted rubber hose, characterized in that: It includes an inner tube body, a skeleton layer and an outer tube body; wherein, The inner tube body, the skeleton layer and the outer tube body are all in the shape of circular tubes, the rigidity of the skeleton layer is greater than that of the inner tube body and the outer tube body, the outer wall surface of the inner tube body abuts against the inner wall surface of the skeleton layer, the outer wall surface of the skeleton layer abuts against the inner wall surface of the outer tube body, and the axial dimension of the skeleton layer is not greater than the axial dimension of the inner tube body and the outer tube body; The skeleton layer includes at least two rows of knitted threads in the axial direction of the knitted rubber tube, and two adjacent rows of knitted threads are spirally wound to form a row of knitted units, and each row of the knitted units includes at least two knitted grids, the width of the knitted grid is the size of the knitted grid in the circumferential direction of the knitted rubber tube, and the length of the knitted grid is the size of the knitted grid along the axial direction of the knitted rubber tube. When there is internal pressure in the inner tube body, the knitted grid is subjected to equal forces in the width and length directions, so that the skeleton layer is subjected to equal forces in the circumferential and axial directions; The axial dimensions of the inner tube body and the skeleton layer are not greater than the axial dimensions of the outer tube body; The size of each knitted mesh satisfies: w / h=tan54.73°, wherein w represents the width of the knitted mesh, and h represents the length of the knitted mesh; Within a length of 1 cm, the number N of knitted threads satisfies: ; Wherein, D represents the outer diameter of the skeleton layer of the knitted rubber hose, P represents the bursting pressure, k represents the strength of the knitted thread, i represents the number of layers of the skeleton layer along the radial direction of the knitted rubber hose, C1 is the correction coefficient, and C2 represents the breaking elongation of the knitted thread; The correction coefficient C1 has a value range of 0.8 to 0.9; The length of each knitted mesh satisfies: ; Wherein, C3 represents the tension coefficient of the knitted hose skeleton layer; The width of each knitted grid satisfies: , the tension coefficient C3 of the knitted hose skeleton layer ranges from 0.8 to 0.9; The through hole diameter of the needle guide rail of the knitting machine for manufacturing the skeleton layer satisfies: ; Wherein, y represents the height of the knitting needle, T represents the wall thickness of the needle guide, and n represents the number of knitting needles required to manufacture a row of knitting units.

2. A method for extending the service life of a knitted rubber hose as claimed in claim 1, characterized in that: The length and width of the knitted mesh are selected so that the skeleton layer of the knitted rubber hose is subjected to equal forces in the axial and circumferential directions.

3. The method for extending the service life of a knitted hose according to claim 2, characterized in that: The method for selecting the knitted mesh length and width dimensions comprises the following steps: a) calculating the number N of the knitted yarn within a length of 1 cm; b) calculating the length h and width w of each knitted mesh; c) Calculate the number of needles n required to make a row of knitting units; d) calculating the length of each knitting thread and the length of the thread consumed by the knitting machine after knitting one knitting unit; e) Calculate the hole diameter d of the needle guide required to manufacture a row of knitting units.

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