Novel prefabricated directly-buried thermal insulation pipe

Abstract

The utility model belongs to the technical field of thermal insulation pipes, and particularly relates to a novel prefabricated directly-buried thermal insulation pipe which comprises a steel pipe, an outer protective pipe and polyurethane foam, the polyurethane foam is arranged between the steel pipe and the outer protective pipe, an aluminum foil shielding layer is sleeved on the outer surface of the steel pipe, a polyurethane foam layer is arranged outside the aluminum foil shielding layer, and the outer protective pipe is arranged on the outer protective pipe. An aerogel felt and aluminum silicate fiber cotton are sequentially arranged outside the polyurethane foam layer, and the outer protective pipe is arranged outside the aluminum silicate fiber cotton. The device is simple in structure, a multi-layer composite insulation structure is adopted, and energy loss is greatly reduced through composite use of multiple layers of insulation materials. The inner layer is an aluminum foil shielding layer with good reflection performance, so that heat radiation loss is reduced; the middle layer is made of aerogel felt or aluminum silicate fiber cotton, so that heat conduction loss is effectively reduced. The device is suitable for conveying high-temperature steam, and heat is prevented from being greatly dissipated.

Description

Technical Field

[0001] The utility model belongs to the technical field of thermal insulation pipes, and specifically relates to a novel prefabricated direct-buried thermal insulation pipe. Background Art

[0002] Prefabricated direct buried insulated pipes are composed of steel pipes (working pipes) for conveying media, polyurethane rigid foam plastic layers (insulation layers), and high-density polyethylene outer sleeves (outer protective layers). They are widely used in the insulation and cold preservation projects of central heating pipes, central air-conditioning pipes, chemical, pharmaceutical and other industrial pipes due to their advantages of low heat loss, good corrosion resistance and insulation performance, and quick and safe construction. The main process is to spray polyurethane on the surface of the steel pipe that has been derusted, and then insert an external protective pipe on the outside of the steel pipe, and then inject the foaming liquid of the insulation material into the gap between the steel pipe and the external protective pipe to complete the production of the insulation pipe.

[0003] The applicant recently applied for a prefabricated direct-buried thermal insulation pipe, application number: 201520572814.2, which includes a steel casing, a polyurethane foam layer and an outer protective pipe arranged from the inside to the outside, the steel casing is covered with a layer of high-temperature resistant fiber felt, the high-temperature resistant fiber felt layer is attached with a layer of composite calcium silicate thermal insulation tile, and the polyurethane foam layer is filled between the composite calcium silicate thermal insulation tile and the outer protective pipe. The applicant found in actual application that if this structure is used in a thermal pipeline, its heat loss is relatively large, so it is necessary to improve this direct-buried pipe to reduce heat loss. Utility Model Content

[0004] The utility model aims to provide a novel prefabricated direct-buried thermal insulation pipe to solve the problems existing in the background technology.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a new prefabricated direct-buried thermal insulation pipe, comprising a steel pipe, an outer protective pipe and polyurethane foam, the polyurethane foam being arranged between the steel pipe and the outer protective pipe, an aluminum foil shielding layer being sheathed on the outer surface of the steel pipe, the polyurethane foam being arranged on the outside of the aluminum foil shielding layer, aerogel felt and aluminum silicate fiber cotton being arranged in sequence on the outside of the polyurethane foam, and the outer protective pipe being arranged on the outside of the aluminum silicate fiber cotton.

[0006] Preferably, the thickness of the aluminum foil shielding layer is 0.05 mm-0.2 mm.

[0007] Preferably, the thickness of the aerogel felt or aluminum silicate fiber cotton is 10 mm-30 mm.

[0008] Preferably, the aerogel felt or aluminum silicate fiber cotton is fixed to the inner surface of the outer protective tube by bonding.

[0009] Preferably, the aluminum foil shielding layer is fixed on the outer surface of the steel pipe in a winding manner.

[0010] The beneficial effects of the utility model are as follows: the device has a simple structure, adopts a multi-layer composite insulation structure, and greatly reduces energy loss through the composite use of multiple layers of insulation materials. The inner layer is an aluminum foil shielding layer with good reflective performance to reduce heat radiation loss; aerogel felt or aluminum silicate fiber cotton is used on the inner side of the outer protective tube to effectively reduce heat conduction loss. The device is suitable for the transportation of high-temperature steam to prevent heat from being lost in large quantities. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a cross-sectional view of the present invention. DETAILED DESCRIPTION

[0012] In the description of the present disclosure, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., 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 disclosure and simplifying the description, and do not indicate or imply that the device or element referred to 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 disclosure.

[0013] 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. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present disclosure, unless otherwise specified, "plurality" means two or more.

[0014] In the description of the present disclosure, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "fixed" 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, an electrical connection, or a communication connection; it can be a direct connection, or it can be indirectly connected 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 disclosure can be understood according to specific circumstances.

[0015] The specific implementation of the utility model is described in detail below with reference to the accompanying drawings and preferred embodiments.

[0016] like Figure 1As shown, the utility model discloses a new type of prefabricated direct-buried thermal insulation pipe, including a steel pipe 1, an outer protective pipe 2 and a polyurethane foam 3. In this device, the steel pipe adopts a DN200 alloy steel pipe with a wall thickness of about 5mm. The polyurethane foam is arranged between the steel pipe and the outer protective pipe. This device makes two improvements to the existing thermal insulation pipe. One is that an aluminum foil shielding layer 4 is sleeved on the outer surface of the steel pipe, and the thickness of the aluminum shielding layer is 0.05mm-0.2mm. The polyurethane foam is arranged on the outside of the aluminum foil shielding layer, and the aluminum foil shielding layer is fixed to the outer surface of the steel pipe by winding. After the steel pipe is polished and rust-removed, a layer of anti-corrosion glue is applied on the surface. After the anti-corrosion glue is dried, another layer of glue is applied. After that, the aluminum foil is wound in circles in a pressing manner. After all the windings are completed, wait for a period of time to ensure that the aluminum foil can be fixed on the steel pipe.

[0017] Another improvement of this device is the improvement of the outer protective tube. The outside of the polyurethane foam is provided with aerogel felt 5 and aluminum silicate fiber cotton 6 in sequence, and the thickness of the aerogel felt or aluminum silicate fiber cotton is 10mm-30mm. The outer protective tube is provided on the outside of the aluminum silicate fiber cotton. The outer protective tube is made of high-density polyethylene, has excellent waterproof, moisture-proof and UV resistance, and protects the insulation layer from the external environment. The aerogel felt or aluminum silicate fiber cotton is fixed to the inner surface of the outer protective tube by bonding. The outer protective tube needs to be processed before foaming. The aerogel felt and aluminum silicate fiber cotton are first bonded together by gluing. After the two form a whole, they are spliced ​​to the inner wall of the outer protective tube. Finally, the steel pipe with aluminum foil is inserted into the outer protective tube with aerogel felt and aluminum silicate fiber cotton for foaming to form a whole. This structure greatly reduces energy loss through the composite use of multiple layers of thermal insulation materials.

[0018] It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the utility model, and these improvements and modifications should also be regarded as the protection scope of the utility model.

Claims

1. A new type of prefabricated direct buried thermal insulation pipe, comprising a steel pipe, an outer protective pipe and polyurethane foam, wherein the polyurethane foam is arranged between the steel pipe and the outer protective pipe, characterized in that: An aluminum foil shielding layer is sheathed on the outer surface of the steel pipe, the polyurethane foam is arranged outside the aluminum foil shielding layer, aerogel felt and aluminum silicate fiber cotton are arranged in sequence outside the polyurethane foam, and the outer protective tube is arranged outside the aluminum silicate fiber cotton.

2. According to the novel prefabricated direct buried thermal insulation pipe according to claim 1, it is characterized in that: The thickness of the aluminum foil shielding layer is 0.05mm-0.2mm.

3. According to the novel prefabricated direct buried thermal insulation pipe of claim 1, it is characterized in that: The thickness of the aerogel felt or aluminum silicate fiber cotton is 10mm-30mm.

4. According to claim 1, the novel prefabricated direct buried thermal insulation pipe is characterized in that: The aerogel felt or aluminum silicate fiber cotton is fixed to the inner surface of the outer protective tube by bonding.

5. According to the novel prefabricated direct buried thermal insulation pipe of claim 1, it is characterized in that: The aluminum foil shielding layer is fixed on the outer surface of the steel pipe in a winding manner.

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