Acid and alkali resistant hose

Abstract

The utility model discloses an acid and alkali resistant hose. The acid and alkali resistant hose sequentially comprises an acid and alkali resistant inner layer, a first middle buffer layer, an elastic metal wire, a second middle buffer layer and an outer protective layer from inside to outside. The utility model has the characteristics of acid and alkali resistance, high cleanliness, low precipitation and light weight; and meanwhile, the flexible pipe has good flexibility and can achieve a smaller bending radius, so that the flexible pipe is easy to bend.

Description

Technical Field

[0001] The utility model relates to the field of hose preparation, in particular to an acid- and alkali-resistant hose for gas suction. Background Art

[0002] Suction and exhaust equipment should be applied to exhaust pipes (intake pipes) to play the role of gas suction, indoor ventilation and exhaust, cleaning and dust removal. In some specific industries, due to the need to consider the nature of the suction gas itself, the acid and alkali resistance of the air pipe is required to be high; for example, in the chemical industry, organic, solvent, corrosive hot or cold air is guided, in the electronic and electrical industry, high-temperature hot smoke from precision electronic equipment is sucked or discharged, silicon wafer drying air knife intake and exhaust, and dust-free room equipment ventilation and exhaust in the pharmaceutical and biochemical industry. In addition, on some equipment that needs to realize the suction and discharge functions, when the pH value of the fluid is high, liquid pipes with good acid and alkali resistance are also required.

[0003] There are also some hoses with good acid and alkali resistance in the prior art. For example, the Chinese utility model of the announcement number CN110425348B discloses a high temperature resistant low permeability gas-liquid hose, its preparation method and application. This gas-liquid hose is mainly composed of PTFE (polytetrafluoroethylene) layer, FKM layer, fabric layer and / or elastic metal wire layer, has good flexibility and flex resistance, is not easy to bend, and has excellent permeability resistance. This gas-liquid hose is formed by extrusion process, and the extrusion shaping of the trachea is realized by an extruder. Although the acid and alkali resistance of the pipeline can be guaranteed by the PTFE layer of its inner layer, however, it is limited to the extrusion process, and the pipeline wall of the extrusion molding is thicker (the wall of the current domestic technology extrusion molding is generally more than 0.6mm), and at the same time, the extrusion molding trachea is an inner and outer flat tube, which does not have retractility. In addition, the cost of the extrusion process is also higher.

[0004] Due to this limitation, the performance of existing acid- and alkali-resistant hoses is insufficient when applied to air suction and exhaust or liquid suction and discharge equipment, and such acid- and alkali-resistant hoses are only suitable for use on pressure-resistant pipes. In the aforementioned industry applications, the length of the air suction and exhaust or liquid suction and discharge equipment pipelines is usually relatively long, and the extension path is relatively long, requiring a sufficiently small bending radius and also requiring flexibility. However, the extruded hose has a thicker wall, a large bending radius, is difficult to bend, and has poor flexibility, which makes the above hoses unsuitable for use on fluid pipes used for air suction and exhaust or liquid suction and discharge equipment. Utility Model Content

[0005] In order to overcome the deficiencies of the prior art, the purpose of the utility model is to provide an acid- and alkali-resistant hose, which can solve the problems of the prior art acid- and alkali-resistant hoses, such as insufficient elasticity, large bending radius, and unsuitability for use as suction and discharge pipes.

[0006] The utility model is realized by the following technical solutions:

[0007] An acid- and alkali-resistant hose, comprising: an acid- and alkali-resistant inner layer formed by winding on a tubular mold, the acid- and alkali-resistant inner layer being any one of a PTFE film, a PFA film, a PP film, and a PE film; a first intermediate buffer layer, wound or woven on the outer periphery of the acid- and alkali-resistant inner layer, the first intermediate buffer layer being any one of a fiber cloth layer, a rubber cloth layer, and a silicone cloth layer; or, the first intermediate buffer layer comprises, from the inside to the outside, any one of a rubber layer or a silicone layer and a fiber cloth layer, the rubber layer or the silicone layer being wound around the outside of the acid- and alkali-resistant inner layer, the fiber cloth layer being wound or woven around the outside of the rubber layer or the silicone layer; an elastic metal wire, one or more layers of the elastic The metal wire is spirally wound around the outer circumference of the first intermediate buffer layer; the second intermediate buffer layer is wound or woven around the outer circumference of the elastic metal wire, and the second intermediate buffer layer is any one of a fiber cloth layer, a rubber cloth layer, and a silicone cloth layer; or, the second intermediate buffer layer includes, from the inside to the outside: any one of a rubber layer or a silicone layer and a fiber cloth layer, the rubber layer or the silicone layer is wound around the elastic metal wire, and the fiber cloth layer is wound or woven around the rubber layer or the silicone layer; an outer protective layer, the outer protective layer is a protective film layer coated on the second intermediate buffer layer, or the outer protective layer is a winding wire wound along the winding direction of the steel wire.

[0008] Furthermore, the acid- and alkali-resistant inner layer is a PTFE membrane that has been treated with sodium.

[0009] Furthermore, the thickness of the acid- and alkali-resistant inner layer is 0.06 mm to 0.6 mm.

[0010] Furthermore, the elastic metal wire is a steel wire, and the steel wire is coated with a rubber layer.

[0011] Furthermore, the outer protective layer is a protective film layer, and a high-temperature antistatic coating is coated on the outer wall.

[0012] Furthermore, the inner wall of the acid- and alkali-resistant inner layer is a smooth antistatic inner wall.

[0013] Compared with the prior art, the utility model can achieve the following beneficial effects:

[0014] (1) In the present invention, the acid- and alkali-resistant inner layer is made of any one of PTFE film, PFA film, PP film, and PE film. The material characteristics of the inner layer enable the hose to have the characteristics of acid- and alkali-resistant, high cleanliness, low precipitation, and lightness;

[0015] (2) At the same time, the utility model prepares the acid- and alkali-resistant hose by winding, without being limited by the previous extrusion process. In this way, the thickness of the acid- and alkali-resistant inner layer can be made thinner (the wall thickness produced by the extrusion process is generally above 0.6 mm, while the wall thickness of the winding process can reach 0.06-0.6 mm), which significantly reduces the wall thickness of the pipe. In this way, the thin-walled hose has the characteristics of being light and can achieve a smaller bending radius, making the hose easy to bend and more suitable for use in suction and exhaust equipment;

[0016] (3) A spirally wound elastic metal wire structure is provided between the first intermediate buffer layer and the second intermediate buffer layer, so that the hose has good elasticity and high radial strength and axial strength, and is suitable for use as a gas pipe for air suction and exhaust. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 Shown is a schematic diagram of the appearance of the utility model;

[0018] Figure 2 Shown is a cross-sectional view of the first embodiment of the utility model;

[0019] Figure 3 Shown is a cross-sectional view of the second embodiment of the present utility model.

[0020] In the figure: 100, acid and alkali resistant hose; 10, acid and alkali resistant inner layer; 20, first intermediate buffer layer; 30, elastic metal wire; 40, second intermediate buffer layer; 50, outer protective layer. DETAILED DESCRIPTION

[0021] The present invention is further described below in conjunction with the accompanying drawings and specific implementation methods. It should be noted that, under the premise of no conflict, the various embodiments or technical features described below can be arbitrarily combined to form a new embodiment.

[0022] In the description of the present invention, it should be understood that the terms "center", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicating orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0023] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0024] In the description of the present utility model, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0025] The utility model discloses an acid-alkali resistant hose 100, which is particularly used for air intake pipes and exhaust pipes. Figure 1-Figure 2 The acid-alkali resistant hose 100 includes, from inside to outside, an acid-alkali resistant inner layer 10 , a first intermediate buffer layer 20 , an elastic metal wire 30 , a second intermediate buffer layer 40 and an outer protective layer 50 .

[0026] Embodiment 1:

[0027] Among them, the acid-alkali resistant inner layer 10 is any one of PTFE film, PFA film, PP film, and PE film, preferably PTPE film; different from the existing PTFE tube using an extrusion molding process, in this embodiment, the acid-alkali resistant inner layer 10 is coated with a coupling agent on a PTPE film of sufficiently thin thickness, and then wrapped on a tubular mold to form a tubular structure. The first intermediate buffer layer 20 is made of any one of fiber cloth, rubber cloth, and silicone, and is wrapped on the outer periphery of the acid-alkali resistant inner layer 10 by winding or weaving. The elastic metal wire 30 is preferably made of steel wire, and the entire steel wire is spirally wound on the outer periphery of the first intermediate buffer layer 20. In addition to strengthening the skeleton, the steel wire has a structure similar to a spiral spring that can also make the hose as a whole retractable along the axis. Similar to the first intermediate buffer layer 20, the second intermediate buffer layer 40 is also made of any one of fiber cloth, rubber cloth, and silicone, and is wrapped on the outer periphery of the elastic metal wire 30 by winding or weaving. The first intermediate buffer layer 20 and the second intermediate buffer layer 40 form a double membrane structure wrapped with steel wire. The outer protective layer 50 is a protective film covering the second intermediate buffer layer 40, or is wound along the winding direction of the steel wire. During processing, after the above layers are connected and wrapped, the hose is placed in a high temperature box for vulcanization and shaping.

[0028] Embodiment 2:

[0029] See also Figure 1 and Figure 3 Similar to the first embodiment, the acid- and alkali-resistant inner layer 10 is any one of a PTFE film, a PFA film, a PP film, and a PE film, preferably a PTPE film; different from the existing PTFE tube using an extrusion molding process, in this embodiment, the acid- and alkali-resistant inner layer 10 is formed by applying a coupling agent on a PTPE film of sufficiently thin thickness, and then winding it on a tubular mold to be formed into a tubular structure.

[0030] The difference between the second embodiment and the first embodiment is that in the second embodiment, the first intermediate buffer layer 20 includes a two-layer structure, which includes, from the inside to the outside: any one of a rubber layer or a silicone layer and a fiber cloth layer, the rubber layer or the silicone layer is wound around the acid- and alkali-resistant inner layer 10, and the fiber cloth layer is wound or woven around the rubber layer or the silicone layer. At the same time, the second intermediate buffer layer 40 may also include a two-layer structure, which includes, from the inside to the outside: any one of a rubber layer or a silicone layer and a fiber cloth layer, the rubber layer or the silicone layer is wound around the elastic metal wire 30, and the fiber cloth layer is wound or woven around the rubber layer or the silicone layer.

[0031] That is to say, in the second embodiment, multiple rubber layers and silicone layers may be provided, or multiple fiber cloth layers may be provided.

[0032] Similar to the first embodiment, the elastic metal wire 30 is preferably a steel wire, and the entire steel wire is spirally wound on the outer periphery of the first intermediate buffer layer 20. In addition to strengthening the skeleton, the steel wire, similar to the structure of the spiral spring, can also make the hose as a whole retractable along the axis. The outer protective layer 50 is also a protective film covering the second intermediate buffer layer 40, or it is wound along the winding direction of the steel wire. During processing, after the above layers are connected and wrapped, the hose is placed in a high-temperature box for vulcanization and shaping.

[0033] Compared with the prior art, the technical effects of the utility model are:

[0034] (1) In the present invention, the acid- and alkali-resistant inner layer 10 is made of any one of PTFE film, PFA film, PP film, and PE film, especially PTFE film. The material characteristics of the inner layer make the hose have the characteristics of acid- and alkali-resistant, high cleanliness, low precipitation, and light weight;

[0035] (2) At the same time, the utility model prepares the acid- and alkali-resistant hose by winding, without being limited by the previous extrusion process. In this way, the thickness of the acid- and alkali-resistant inner layer 10 can be made thinner (the wall thickness obtained by the extrusion process is generally above 0.6 mm, while the wall thickness of the winding process can reach 0.06-0.6 mm), which significantly reduces the wall thickness of the pipe. In this way, the thin-walled hose has the characteristics of being light and can achieve a smaller bending radius, making the hose easy to bend and more suitable for use in suction and exhaust equipment;

[0036] (3) A spirally wound elastic metal wire structure is provided between the first intermediate buffer layer and the second intermediate buffer layer, so that the hose has good elasticity and high radial strength and axial strength, and is suitable for use as a gas pipe for air suction and exhaust.

[0037] Preferably, the acid- and alkali-resistant inner layer 10 is made of a PTFE membrane, and both sides thereof are treated with sodium, which can activate the surface of the PTFE membrane layer and improve the bonding strength of the PTFE membrane.

[0038] Since the winding molding process on the mold is adopted, the thickness of the acid and alkali resistant inner layer 10 can be made thinner. Preferably, the thickness of the acid and alkali resistant inner layer 10 is 0.06 mm to 0.6 mm.

[0039] Preferably, the elastic metal wire 30 is made of steel wire. Before the steel wire is spirally wound onto the first intermediate buffer layer 20, the steel wire may be coated with a rubber layer (rubber or silicone) to enhance adhesion with the first intermediate buffer layer 20 and the second intermediate buffer layer 40. Of course, the steel wire may not be coated with rubber.

[0040] Preferably, the outer protective layer 50 is a protective film layer, and a high-temperature antistatic coating is coated on the outer wall of the protective film.

[0041] Preferably, the inner wall of the acid- and alkali-resistant inner layer 10 is a smooth antistatic inner wall, so that the bending radius of the hose is smaller.

[0042] The above-mentioned implementation modes are only preferred implementation modes of the present invention, and cannot be used to limit the protection scope of the present invention. Any non-substantial changes and substitutions made by technicians in this field on the basis of the present invention shall fall within the scope of protection required by the present invention.

Claims

1. An acid and alkali resistant hose, characterized in that: include: The acid- and alkali-resistant inner layer is formed by winding on a tubular mold, wherein the acid- and alkali-resistant inner layer is any one of a PTFE film, a PFA film, a PP film, and a PE film; A first intermediate buffer layer is wound around the outer periphery of the acid- and alkali-resistant inner layer, and the first intermediate buffer layer is any one of a fiber cloth layer, a rubber cloth layer, and a silicone cloth layer; or, the first intermediate buffer layer includes, from the inside to the outside, any one of a rubber layer or a silicone layer and a fiber cloth layer, the rubber layer or the silicone layer is wound around the outside of the acid- and alkali-resistant inner layer, and the fiber cloth layer is wound or woven around the outside of the rubber layer or the silicone layer; An elastic metal wire, one or more layers of the elastic metal wire are spirally wound around the outer circumference of the first intermediate buffer layer; A second intermediate buffer layer is wound around the outer periphery of the elastic metal wire, and the second intermediate buffer layer is any one of a fiber cloth layer, a rubber cloth layer, and a silicone cloth layer; or the second intermediate buffer layer includes, from the inside to the outside, any one of a rubber layer or a silicone layer and a fiber cloth layer, the rubber layer or the silicone layer is wound around the elastic metal wire, and the fiber cloth layer is wound or woven around the rubber layer or the silicone layer; The outer protective layer is a protective film layer coated on the second intermediate buffer layer, or the outer protective layer is a winding wire wound along the winding direction of the steel wire.

2. The acid- and alkali-resistant hose according to claim 1, characterized in that: The acid and alkali resistant inner layer is a PTFE membrane that has been treated with sodium.

3. The acid- and alkali-resistant hose according to claim 1, characterized in that: The thickness of the acid and alkali resistant inner layer is 0.06 mm to 0.6 mm.

4. The acid- and alkali-resistant hose according to claim 1, characterized in that: The elastic metal wire is a steel wire, and a rubber layer is coated on the steel wire.

5. The acid- and alkali-resistant hose according to claim 1, characterized in that: The outer protective layer is a protective film layer, and a high-temperature antistatic coating is coated on the outer wall.

6. The acid- and alkali-resistant hose according to claim 1, characterized in that: The inner wall of the acid and alkali resistant inner layer is a smooth antistatic inner wall.

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