Thermal insulation pipeline and preparation method
By setting a low-heat loss bracket with a thermal conductivity close to the insulation layer in the insulation pipe, the problems of inconsistent thickness and high heat loss are solved, and more efficient insulation effect and structural support are achieved.
Patent Information
- Application Number
- CN202411417832.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-11
- Publication Date
- 2025-02-11
AI Technical Summary
When the existing insulation pipe is equipped with an insulation layer, it is difficult to ensure that the gap between the working steel pipe and the outer guard pipe is uniform, resulting in inconsistent thickness of the insulation layer, resulting in eccentricity and heat loss problems. In addition, the wooden bracket has a high thermal conductivity, which increases heat loss.
A low-heat loss bracket is used to make a low-heat loss bracket with a thermal conductivity close to the insulation layer by mixing vermiculite and concrete, and set it around the annular direction between the working steel pipe and the outer guard pipe to ensure the consistency of the thickness of the insulation layer and reduce heat loss.
The consistency of the thickness of the insulation layer in the insulation pipe is achieved, which reduces heat loss, improves the insulation effect, and provides structural support for the pipeline to avoid deformation and displacement.
Smart Images
Figure CN119412575A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of thermal insulation pipes, and in particular to a low heat loss bracket for thermal insulation pipes and a preparation method thereof. Background Art
[0002] Prefabricated direct buried insulated pipes are a type of heating pipes and are widely used in chemical pipeline projects, petroleum, central air-conditioning ventilation ducts, central heating, municipal engineering, etc. They have the advantages of high efficiency insulation, waterproof and anti-corrosion, and convenient construction.
[0003] Usually, prefabricated direct-buried insulated pipes are composed of a working steel pipe, an insulation layer and an outer protective pipe. When setting the insulation layer of the current insulated pipe, it is difficult to ensure that the gap between the working steel pipe and the outer protective pipe is uniform, which makes the thickness of the insulation layer in the circumferential direction of the insulated pipe body inconsistent, causing the insulation pipe to be eccentric and have a higher heat loss in the thin-walled weak parts.
[0004] In addition, in the prior art, a wooden support structure is arranged in the insulated pipe, but the thermal conductivity of the wooden support structure is relatively high, and in particular, the wooden support is easy to absorb moisture, and the thermal conductivity will be further increased after it becomes damp, while the thermal conductivity of the insulation layer and the wooden support is quite different, which will cause excessive heat loss in the insulated pipe and affect the overall insulation effect of the insulated pipe. Summary of the invention
[0005] In view of the problems existing in the prior art, the present invention provides an insulated pipe and a preparation method thereof. By arranging the low heat loss bracket proposed by the present invention in the insulated pipe, it can be ensured that the gap between the working steel pipe and the outer protective pipe of the insulation layer before foaming is uniform, so that the thickness of the insulation layer in the circumferential direction of the insulation pipe body is consistent, and high heat loss at the thin-walled weak points when the insulation pipe is eccentric is avoided. At the same time, structural support is provided for the insulated pipe to avoid deformation and displacement of the insulated pipe during use, and the thermal conductivity of the bracket structure is kept close to that of the insulation layer, so as to reduce heat loss and further improve the insulation effect of the insulated pipe.
[0006] The technical solution of the present invention is as follows:
[0007] In a first aspect of the present invention, an insulated pipeline is provided, comprising a working steel pipe and an outer protective pipe sleeved on the outside of the working steel pipe, a plurality of low heat loss brackets are provided between the working steel pipe and the outer protective pipe for circumferential support, and an insulation layer is filled between the working steel pipe, the outer protective pipe and the plurality of low heat loss brackets; the thermal conductivity of the low heat loss bracket is 0.9-1.2 times the thermal conductivity of the insulation layer.
[0008] In some embodiments of the present invention, a plurality of low heat loss supports are arranged at annular intervals along the outer side of the working steel pipe.
[0009] In some embodiments of the present invention, the low heat loss bracket is arranged in a trapezoidal structure.
[0010] In some embodiments of the present invention, the width of one end of the low heat loss bracket abutting against the working steel pipe is greater than the width of one end abutting against the outer protective pipe.
[0011] In some embodiments of the present invention, the low heat loss bracket is made by mixing vermiculite and concrete, and the ratio of vermiculite to concrete is 6:1.
[0012] In some embodiments of the present invention, the vermiculite is 20-40 mesh vermiculite, and the concrete is 400-450 mesh Portland cement.
[0013] In a second aspect of the present invention, a method for preparing a low heat loss bracket for an insulation pipe is provided, comprising:
[0014] Step 1: Vermiculite is used as aggregate and concrete is used as binder, and water and sand are mixed evenly according to a set ratio to form a slurry;
[0015] Step 2, placing the slurry into a mold and applying a certain pressure to press and mold it to obtain a low heat loss bracket;
[0016] Step three: support a number of low heat loss brackets in the circumferential direction between the working steel pipe and the outer protective pipe, and fill them with an insulation layer.
[0017] In some embodiments of the present invention, the step 1 is specifically to mix vermiculite and concrete in a ratio of 6:1 with water and sand to form a slurry.
[0018] In some embodiments of the present invention, the step 2 is specifically, when the outdoor temperature is higher than the set temperature, the pressed semi-finished bracket is placed outdoors for drying together with the special mold by adopting a room temperature curing method;
[0019] When the outdoor temperature is lower than the set temperature, the pressed bracket semi-finished product together with the mold is placed in a heating furnace, heated to the set temperature, and kept warm for forming.
[0020] In some embodiments of the present invention, the mold is a one-mold multi-cavity structure, and the cavity structure is arranged in a trapezoidal shape.
[0021] One or more technical solutions of the present invention have the following beneficial effects:
[0022] The insulated pipe provided by the present invention can ensure that the gap between the working steel pipe and the outer protective pipe of the insulation layer is uniform before foaming by arranging the low heat loss bracket proposed by the present invention in the insulation pipe, so that the thickness of the insulation layer in the circumferential direction of the insulation pipe body is consistent, avoiding high heat loss at the thin-walled weak points when the insulation pipe is eccentric, and at the same time, structural support is provided for the insulated pipe to avoid deformation and displacement of the insulated pipe during use, and the thermal conductivity of the bracket structure is kept close to that of the insulation layer, so as to reduce heat loss and further improve the insulation effect of the insulated pipe. BRIEF DESCRIPTION OF THE DRAWINGS
[0023] Figure 1 A cross-sectional view of a low heat loss support for an insulated pipe provided in Example 1 of the present invention Figure 1 ;
[0024] Figure 2 A cross-sectional view of a low heat loss support for an insulated pipe provided in Example 1 of the present invention Figure 2 ;
[0025] Figure 3 This is a schematic diagram of a mold for manufacturing a low heat loss bracket for an insulation pipe provided in Example 1 of the present invention.
[0026] In the figure: 1. Working steel pipe; 2. Outer protective pipe; 3. Low heat loss bracket; 4. Insulation layer; 5. Mould. DETAILED DESCRIPTION
[0027] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.
[0028] Example 1
[0029] In a typical embodiment of the present invention, an insulated pipe is provided, comprising a working steel pipe 1 and an outer protective pipe 2 sleeved on the outside of the working steel pipe 1, a plurality of low heat loss brackets 3 are provided between the working steel pipe 1 and the outer protective pipe 2 for circumferential support, and an insulation layer 4 is filled between the working steel pipe 1, the outer protective pipe 2 and the plurality of low heat loss brackets 3; the thermal conductivity of the low heat loss bracket 3 is 0.9-1.2 times the thermal conductivity of the insulation layer 4.
[0030] Furthermore, a plurality of low heat loss brackets 3 are arranged at intervals along the outer side of the working steel pipe 1. In this embodiment, six low heat loss brackets 3 are arranged at intervals along the outer side of the internal working steel pipe 1 in an annular direction, and polyurethane is used as the material of the insulation layer 4, which is foamed and filled between the working steel pipe 1, the outer protective pipe 2, and the low heat loss brackets 3. Such an arrangement ensures that there is stable support between the working steel pipe 1 and the outer protective pipe 2, and can ensure that the gap between the working steel pipe 1 and the outer protective pipe 2 of the insulation pipe is uniform before foaming, so that the thickness of the insulation layer 4 in the circumferential direction of the insulation pipe body is consistent, and when the insulation pipe is eccentric, the thin wall weak part has a high heat loss, and at the same time, the insulation pipe is structurally supported to avoid deformation and displacement of the insulation pipe during use.
[0031] Furthermore, the low heat loss bracket 3 is set in a trapezoidal structure. In this way, the low heat loss bracket 3 with a trapezoidal structure can effectively prevent the bracket from tipping over and turning over between the working steel pipe 1 and the outer protective pipe 2 during the pipeline assembly process, and in the processing process, it is more conducive to template layout and maximizes the utilization rate of production materials.
[0032] Furthermore, the width of one end of the several low heat loss brackets 3 abutting against the working steel pipe 1 is greater than the width of one end abutting against the outer protective pipe 2. Such a configuration can achieve stable support between the working steel pipe 1 and the outer protective pipe 2, and prevent the bracket from flipping between the working steel pipe 1 and the outer protective pipe 2. At the same time, the small width of the end of the trapezoidal structure low heat loss bracket 3 abutting against the outer protective pipe 2 can reduce the gap in the middle of the abutment between the bracket and the outer protective pipe relative to the large width end abutting against the outer protective pipe 2, so as to make the abutment stable; and there are gaps on both sides of the wide end of the bracket abutting against the working steel pipe 1, which can be filled with foamed polyurethane to make the insulation layer more substantial and the support more stable.
[0033] Furthermore, the low heat loss bracket 3 is made of a mixture of vermiculite and concrete, and the ratio of vermiculite to concrete is 6:1.
[0034] Furthermore, the vermiculite is 20-40 mesh vermiculite, and the concrete is 400-450 mesh Portland cement.
[0035] Since the thermal conductivity of traditional wooden supports is relatively high, at 0.15-0.20 [W / (m·K)], and wooden supports are easy to absorb moisture, the thermal conductivity will be further increased after moisture. The thermal conductivity of foamed polyurethane is 0.033 [W / (m·K)], which will cause excessive heat loss at the location of the wooden support and affect the overall insulation effect of the insulation pipe.
[0036] In this embodiment, 20-40 mesh vermiculite is used as aggregate and mixed with concrete. The concrete uses 425 mesh ordinary Portland cement and is mixed in a ratio of 6:1. Then, water and sand are added in appropriate amounts for uniform mixing. The thermal conductivity of the obtained low heat loss bracket 3 is only about 0.03 [W / (m·K)], which is very close to the thermal conductivity of the polyurethane of the insulation pipe. Therefore, the heat loss at the installation position of the insulation pipe bracket after processing is consistent with the insulation layer 4 of the insulation pipe body, which greatly improves the heat transfer effect of the insulation pipe, reduces heat loss, and further improves the insulation effect of the insulation pipe.
[0037] In a second aspect of the present invention, a method for preparing a low heat loss bracket 3 for an insulation pipe is provided, comprising:
[0038] Step 1: Vermiculite is used as aggregate and concrete is used as binder, and water and sand are mixed evenly according to a set ratio to form a slurry;
[0039] Step 2: placing the slurry into a mold 5 and applying a certain pressure to press and mold it to obtain a low heat loss bracket 3;
[0040] Step three: support a plurality of low heat loss supports 3 in the circumferential direction between the working steel pipe 1 and the outer protective pipe 2 , and fill the insulation layer 4 .
[0041] Furthermore, the step 1 is specifically to mix vermiculite and silicate cement in a ratio of 6:1 with water and sand to form a slurry.
[0042] Furthermore, the step 2 is specifically that when the outdoor temperature is higher than the set temperature, the pressed semi-finished bracket together with the special mold 5 are placed outdoors for drying and forming by adopting a normal temperature curing method;
[0043] When the outdoor temperature is lower than the set temperature, the pressed bracket semi-finished product together with the mold is placed in a heating furnace, heated to the set temperature, and kept warm for forming.
[0044] Furthermore, the special mold 5 is a one-mold multi-cavity structure, and the cavity structure is set to be trapezoidal.
[0045] In this embodiment, vermiculite and silicate cement are mixed with water and sand in a ratio of 6:1 to form a slurry, which is placed in a special mold 5 with multiple cavities, and a certain pressure is applied to press and form a plurality of trapezoidal low heat loss brackets 3, which are easy and quick to manufacture;
[0046] When the outdoor temperature is higher than 10°C, the pressed semi-finished bracket is placed outdoors for drying and forming together with the special mold 5 by using a normal temperature curing method;
[0047] When the outdoor temperature is lower than 10°C, the pressed semi-finished bracket together with the mold is placed in a heating furnace, heated to 50°C, and kept warm for forming.
[0048] A plurality of low heat loss supports 3 are supported circumferentially between the working steel pipe 1 and the outer protective pipe 2, and filled with an insulation layer 4, wherein the thermal conductivity of the obtained low heat loss supports 3 is only 0.03 [W / (m·K)], which is close to the thermal conductivity of the foamed polyurethane insulation layer 4 of 0.033 [W / (m·K)]. Such an arrangement reduces the heat loss at the local position where the low heat loss supports 3 are installed on the insulation pipe body, improves the temperature resistance of the insulation pipe, and improves the product quality of the insulation pipe.
[0049] The present invention provides an insulated pipe and a preparation method thereof. By arranging the low heat loss bracket proposed in the present invention in the insulated pipe, it is possible to ensure that the gap between the working steel pipe and the outer protective pipe of the insulation layer before foaming is uniform, so that the thickness of the insulation layer in the circumferential direction of the insulation pipe body is consistent, thereby avoiding high heat loss at the thin-walled weak points when the insulation pipe is eccentric. At the same time, structural support is provided for the insulated pipe to avoid deformation and displacement of the insulated pipe during use, and the thermal conductivity of the bracket structure is kept close to that of the insulation layer, so as to reduce heat loss and further improve the insulation effect of the insulated pipe.
[0050] Although the above describes the specific implementation mode of the present invention in conjunction with the accompanying drawings, it is not intended to limit the scope of protection of the present invention. Those skilled in the art should understand that various modifications or variations that can be made by those skilled in the art on the basis of the technical solution of the present invention without creative work are still within the scope of protection of the present invention.
Claims
1. A heat-insulated pipe, characterized in that: It includes a working steel pipe and an outer protective pipe sleeved on the outside of the working steel pipe, a plurality of low heat loss brackets are provided between the working steel pipe and the outer protective pipe for circumferential support, and an insulation layer is filled between the working steel pipe, the outer protective pipe and the plurality of low heat loss brackets; the thermal conductivity of the low heat loss bracket is 0.9-1.2 times the thermal conductivity of the insulation layer.
2. The heat-insulated pipe according to claim 1, characterized in that: A plurality of low heat loss supports are arranged at annular intervals along the outer side of the working steel pipe.
3. The heat-insulated pipe according to claim 1, characterized in that: The low heat loss bracket is arranged in a trapezoidal structure.
4. The heat-insulated pipe according to claim 3, characterized in that: The width of one end of the low heat loss bracket abutting against the working steel pipe is greater than the width of one end abutting against the outer protective pipe.
5. The thermal insulation pipe according to claim 1, characterized in that: The low heat loss bracket is made by mixing vermiculite and concrete, and the ratio of vermiculite to concrete is 6:
1.
6. The heat-insulated pipe according to claim 5, characterized in that: The vermiculite is 20-40 mesh vermiculite, and the concrete is 400-450 mesh silicate cement.
7. A method for preparing a thermal insulation pipe according to any one of claims 1 to 6, characterized in that: include: Step 1: Vermiculite is used as aggregate and concrete is used as binder, and water and sand are mixed evenly according to a set ratio to form a slurry; Step 2, placing the slurry into a mold and applying a certain pressure to press and mold it to obtain a low heat loss bracket; Step three: support a number of low heat loss brackets in the circumferential direction between the working steel pipe and the outer protective pipe, and fill them with an insulation layer.
8. The method for preparing a heat-insulated pipe according to claim 7, characterized in that: Specifically, the step 1 is to mix vermiculite and concrete in a ratio of 6:1 with water and sand to form a slurry.
9. The method for preparing a heat-insulated pipe according to claim 7, characterized in that: include: The step 2 is specifically as follows: when the outdoor temperature is higher than the set temperature, the pressed semi-finished bracket is placed outdoors for drying together with the special mold by adopting a room temperature curing method; When the outdoor temperature is lower than the set temperature, the pressed bracket semi-finished product together with the mold is placed in a heating furnace, heated to the set temperature, and kept warm for forming.
10. The method for preparing a heat-insulated pipe according to claim 7, characterized in that: The mold is a one-mold multi-cavity structure, and the cavity structure is set to be trapezoidal.