A prefabricated composite heat-insulating steam pipeline

Abstract

The present application relates to a prefabricated composite heat-insulating steam pipeline, belonging to the field of steam pipe networks, and includes a steam pipe, a main heat-insulating layer and a housing. Support assemblies for supporting the steam pipe are respectively arranged at both ends of the main heat-insulating layer. The support assembly includes a first support sleeve and a second support sleeve. The first support sleeve is sleeved outside the steam pipe, and the second support sleeve is sleeved outside the first support sleeve. An annular springboard is clamped between the first support sleeve and the second support sleeve. The annular springboard extends towards the main heat-insulating layer to form an extension part. The main heat-insulating layer includes a first glass wool felt layer and a second glass wool felt layer. The first glass wool felt layer is sleeved outside the steam pipe and located between the first support sleeves at both ends. A support cylinder is arranged between the second support sleeves at both ends. The support cylinder is sleeved outside the extension part, and the second glass wool felt layer is sleeved outside the support cylinder. The present application solves the problem of short service life caused by using glass wool felt as the heat-insulating structure for field steam pipes.

Description

Technical Field

[0001] This application relates to the field of steam pipe networks, and particularly to a prefabricated composite insulated steam pipe. Background Art

[0002] Prefabricated insulated steam pipes are widely used in the construction of industrial steam pipe networks and municipal steam pipe networks. Superfine glass wool felt, as the thermal insulation material for steam pipes, is widely used in the industry. Glass wool is easy to obtain, has quite good thermal insulation performance, can be industrially produced, is light in weight, and has a low price, gathering many advantages. At the same time, glass wool felt has many fatal defects. For example, glass wool felt has no accurate shape and size, does not have pressure-bearing capacity, and will deform when slightly squeezed or even due to its own weight. Moreover, glass wool felt is woven from numerous extremely fine glass fibers, and each fiber is a hollow tubular filament with strong capillary characteristics and is extremely easy to absorb water. Glass is a hydrophilic material, making the cotton felt more likely to absorb water. The water content deteriorates the thermal insulation performance of the glass wool felt, and the density of the water-absorbed glass wool felt increases, resulting in more severe compression deformation caused by self-gravity, further deteriorating the thermal insulation performance. For example Figure 1 , in traditional heat network projects, multiple layers of glass wool felt are widely used to construct the thermal insulation structure of steam pipes. Multiple layers of glass wool felt are overlapped and wrapped around the steam pipe 1 ( Figure 1 for three layers of glass wool felt). The glass wool felt at the top of the pipe is gradually pressed downward by gravity layer by layer, and the cotton felt below the center of the pipe pulls downward on the cotton felt at the top of the pipe. Under the dual action, the cotton felt at the top of the pipe is compressed and thinned, reducing the thermal resistance of the thermal insulation layer and increasing the heat loss of the pipeline. The cotton felt at the bottom of the pipe sags and detaches from the steam pipe 1 to form a cavity, which is called an air flow channel, further deteriorating the thermal insulation effect of the pipeline. Moreover, without protection, the service life of steam pipe networks laid in the wild using glass wool for thermal insulation is not long, thus seriously offsetting the advantage of the low price of glass wool felt.

[0003] In addition, glass wool felt is a fluffy material without any load-bearing capacity. For traditional pipes insulated with glass wool felt, steel supports are additionally configured. In traditional insulated pipes, steel supports are called heat bridges. Steel supports bear the weight of steam steel pipes. Ordinary steel is a good conductor of heat, and its heat conduction ability is about 1000 times that of glass wool felt. This is contrary to the hope of reducing the heat loss of steam pipes through thermal insulation. Summary of the Invention

[0004] In order to solve the problem of short service life caused by using glass wool for thermal insulation in steam pipe networks in the wild environment, this application provides a prefabricated composite insulated steam pipe.

[0005] The prefabricated composite insulated steam pipe provided by this application adopts the following technical solutions:

[0006] A prefabricated composite heat-insulating steam pipe, comprising a steam pipe, a main heat-insulating layer and a shell. The heat-insulating layer is sleeved outside the steam pipe, the shell is sleeved outside the main heat-insulating layer, and support assemblies for supporting the steam pipe are respectively arranged at two ends of the main heat-insulating layer. The support assembly includes a first support sleeve and a second support sleeve. The first support sleeve is sleeved outside the steam pipe, the second support sleeve is sleeved outside the first support sleeve, and an annular springboard is clamped between the first support sleeve and the second support sleeve. The annular springboard extends towards the main heat-insulating layer to form an extension part. The main heat-insulating layer includes a first glass wool felt layer and a second glass wool felt layer. The first glass wool felt layer is sleeved outside the steam pipe and located between the first support sleeves at both ends. A support cylinder is arranged between the second support sleeves at both ends. The support cylinder is sleeved outside the extension part, and the second glass wool felt layer is sleeved outside the support cylinder.

[0007] By adopting the above technical solution, the second glass wool felt layer is placed on the bridge surface formed by the first support sleeve, the second support sleeve, the annular springboard clamped between the first support sleeve and the second support sleeve, and the support cylinder, avoiding the extrusion of the upper glass wool felt layer on the lower glass wool felt layer, transferring the gravity of the second glass wool felt layer to the support assembly, eliminating the possible gravity extrusion of the upper glass wool felt on the lower glass wool felt, and the weights of each layer of glass wool felt are respectively transmitted to the steam pipe through the support cylinder, the annular springboard and the support sleeve, providing reliable protection for the fragile glass wool felt which is the main body of the pipeline heat insulation, providing the maximum protection for the glass wool felt, weakening its disadvantages, improving the heat efficiency of the pipe network and extending the service life of the heat insulation structure of the pipe network.

[0008] Optionally, the support cylinder is a corrugated plate with longitudinal ribs or a ribless cylinder made of cold-rolled steel plate.

[0009] By adopting the above technical solution, the steel support cylinder makes the heat-insulating material a non-combustible material, improving the safety performance.

[0010] Optionally, both the first support sleeve and the second support sleeve are made of micro-porous calcium silicate tiles. The shell is a steel plate shell. The annular springboard is made of thin steel plate rolled.

[0011] By adopting the above technical solution, the hard micro-porous calcium silicate tiles have the advantages of being non-combustible, high-temperature resistant and good in strength, so that the support assembly, the steel plate shell and the steel steam pipe made of the hard micro-porous calcium silicate tiles enclose a solid closed space, providing reliable protection for the glass wool felt layer. The density is equal to 200 kg / m 3The compressive strength of the microporous calcium silicate tile can reach 0.6 MPa to 0.8 MPa. Wrapping a support sleeve made of rigid microporous calcium silicate tiles with an axial dimension of 0.6 m on the steam insulation is sufficient to bear the weight of the 12-m long steel pipe wrapped with the tiles, and there is more than enough margin. Moreover, at least one set of microporous calcium silicate tile support seats is provided at each end of every 12-m steam insulation pipe. The said support seats currently bear the weight of the steam steel pipe (and other insulation materials on the steel pipe), and they are themselves good pipeline insulation materials. The steel ring-shaped springboard provides sufficient support to the support cylinder. The insulation structure composed of the shell, support components, support cylinder, ring-shaped springboard, and main insulation layer, etc., all materials are non-combustible, and it is completely applicable to projects with strict fire prevention requirements.

[0012] Optionally, a plurality of the support cylinders are provided, and a plurality of the second glass wool felt layers are provided, and the numbers of the two correspond to each other.

[0013] By adopting the above technical solution, the total number of layers of the glass wool felt layer is increased, thereby improving the heat insulation effect of the main insulation layer.

[0014] Optionally, a gap is provided between the first glass wool felt layer and the second glass wool felt layer to form an air layer. A gap is provided between two adjacent second glass wool felt layers to form an air layer.

[0015] By adopting the above technical solution, the air layer plays a role in heat insulation. An air layer is provided between adjacent two layers of glass wool felt layers, further improving the heat insulation performance of the main insulation layer, thereby enhancing the heat insulation performance of the main insulation layer. The air layer is preferably 10 mm or less. In the space of this gap, the air does not flow, and the heat insulation effect is better.

[0016] Optionally, the inner surface of the support cylinder has aluminum foil, and the outer surfaces of the first glass wool felt layer and the second glass wool felt layer both have aluminum foil.

[0017] By adopting the above technical solution, the radiant heat transfer in the bright surfaces of the two layers of aluminum foil and the air layer sandwiched therebetween is greatly weakened due to the extremely low emissivity and extremely high reflectivity of the aluminum foil, thereby blocking heat conduction and enhancing the heat insulation effect of the main insulation layer.

[0018] In summary, the present application includes at least one of the following beneficial technical effects:

[0019] 1. Aiming at the problems exposed in the application of glass wool felt in the field pipeline network insulation, the present application proposes a composite insulation structure, which maximally provides protection for the glass wool felt, weakens its disadvantages, improves the heat efficiency of the pipeline network, and extends the service life of the pipeline network insulation structure.

[0020] 2. All materials in the insulated pipeline are non-combustible, and it is completely applicable to projects with strict fire prevention requirements.

[0021] 3. Glass wool felt is cheap and has strong heat preservation ability, but it is fluffy and weak and cannot protect itself. The rigid microporous calcium silicate tile has good heat preservation performance and is firm, but the price is very high. In this application, the two are combined, and the advantages of the two complement each other, greatly improving the cost performance of the heat preservation pipe. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 is a schematic structural diagram of a heat preservation steam pipe in the prior art.

[0023] Figure 2 is a schematic structural diagram of a prefabricated composite heat preservation steam pipe in an embodiment of this application.

[0024] Figure 3 is an axial sectional view (excluding the shell) of the prefabricated composite heat preservation steam pipe in an embodiment of this application.

[0025] DESCRIPTION OF THE REFERENCE NUMERALS: 1. Steam pipe; 2. Shell; 3. First support sleeve; 4. Second support sleeve; 5. Annular springboard; 6. Extension part; 7. First glass wool felt layer; 8. Second glass wool felt layer; 9. Support cylinder; 10. Air layer. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0026] The following will further describe this application in detail Figures 2 - 3 in conjunction with the accompanying drawings.

[0027] An embodiment of this application discloses a prefabricated composite heat preservation steam pipe. Referring to Figure 2 , the prefabricated composite heat preservation steam pipe includes a steam pipe 1, a main heat preservation layer, and a shell 2. The main heat preservation layer is sleeved outside the steam pipe 1, the shell 2 is sleeved outside the main heat preservation layer, and support components for supporting the steam pipe 1 are respectively arranged at both ends of the main heat preservation layer. The support components are also located inside the shell 2. A closed space is formed among the support components, the shell 2, and the steam pipe 1 for installing the main heat preservation layer.

[0028] The support components include a first support sleeve 3 and a second support sleeve 4. The first support sleeve 3 is sleeved outside the steam pipe 1, the second support sleeve 4 is sleeved outside the first support sleeve 3, and the first support sleeve 3 and the second support sleeve 4 form a laminated layer. An annular springboard 5 is clamped between the first support sleeve 3 and the second support sleeve 4. The annular springboard 5 extends towards the main heat preservation layer to form an extension part 6, and the extension part 6 is suspended relative to the support sleeve. A support cylinder 9 is arranged between the second support sleeves 4 at both ends. The support cylinder 9 is sleeved outside the extension part 6 for supporting the support cylinder 9.

[0029] The main insulation layer includes a first glass wool felt layer 7 and a second glass wool felt layer 8. The first glass wool felt layer 7 is directly sleeved outside the steam pipe 1, fits with the steam pipe, and is supported by the steam pipe 1. The first glass wool felt layer 7 is located between the first support sleeves 3 at both ends. The second glass wool felt layer 8 is sleeved outside the support tube 9, fits with the support tube 9, and is supported by the support tube 9 and the extension 6 of the annular springboard 5. By setting the annular springboard 5, the support tube 9 and the second support sleeve 4, the gravity of the second glass wool felt layer 8 is transferred to the support assembly, eliminating the gravity squeezing of the lower glass wool felt by the weight of the upper glass wool felt. The weight of each layer of glass wool felt is transferred to the steam pipe 1 through the support tube 9, the annular springboard 5 and the support sleeve, respectively, providing reliable protection for the fragile glass wool felt as the main body of the pipeline insulation, so that the glass wool felt layer is protected from wind and rain, and from damage caused by people stepping on, squeezing, collision and scratching. Compared with the traditional pipeline insulation process, the service life of the glass wool felt is greatly extended, and the deterioration of the insulation capacity caused by the shedding, missing, hardening and compaction of the glass wool felt is avoided.

[0030] In this embodiment, a plurality of support assemblies are arranged along the axial direction of the steam pipe 1, and a main insulation layer is arranged between two adjacent support assemblies. The annular springboards 5 on the support assemblies at both ends are provided with a single-sided extension 6, and the annular springboards 5 on the support assemblies in the middle are provided with a double-sided extension 6.

[0031] In this embodiment, in order to improve the thermal insulation effect, the main thermal insulation layer is provided with four layers, the first glass wool felt layer 7 is provided with one layer, which is at the bottom layer and directly wraps the steam pipe 1; the second glass wool felt layer 8 is provided with three layers, which are arranged layer by layer from the inside to the outside, and three support tubes 9 are provided to support the second glass wool felt layer 8 of each layer. Except for the different positions, the first glass wool felt layer 7 and the second glass wool felt layer 8 have the same structure and material. The annular springboards 5 at both ends of the main thermal insulation layer are suspended to install the support tubes 9, so that the second glass wool felt layer 8 of each layer is attached to the support tubes 9 and will not squeeze the glass wool felt layer of the next layer. There is a certain gap between the outermost second glass wool felt layer 8 and the shell 2.

[0032] In this embodiment, further, in order to improve the heat preservation effect, a gap may be provided between the first glass wool felt layer 7 and the second glass wool felt layer 8 to form an air layer 10. Similarly, an air layer 10 may also be provided between adjacent two layers of the second glass wool felt layer 8. The air layer 10 is mainly provided between the inner surface of the support cylinder 9 and the outer surface of the lower glass wool felt layer. The thickness of the air layer 10 is 5 mm to 10 mm. Aluminum foil is pasted on the inner surface of the support cylinder 9, and aluminum foil is pasted on the outer surfaces of the first glass wool felt layer 7 and the second glass wool felt layer 8. The radiant heat transfer between the bright surfaces of the aluminum foils on the inner and outer surfaces where the air layer 10 is located and the 5 mm to 10 mm thick air layer sandwiched therein is greatly weakened due to the extremely low emissivity and extremely high reflectivity of the aluminum foil. The air does not flow in the space with a thickness of 10 mm or less, and has a good heat preservation effect. This setting also provides convenience for using tiles and cotton with different thicknesses. It should be noted that, except for this embodiment, in other embodiments, the air layer 10 and the aluminum foil may not be provided.

[0033] In this embodiment, the housing 2 is a steel plate housing, which is made of color steel plate rolled into corrugated steel plate, and the corrugated steel plates are spliced into a cylindrical shape, and are welded and connected between adjacent corrugated plates. The support components (the first support sleeve 3 and the second support sleeve 4) are made of microcrystalline calcium silicate tiles, and the microcrystalline calcium silicate tiles are part of the pipeline heat preservation layer, and more importantly, serve as the support of the pipeline heat preservation layer to play a load-bearing role. The housing 2 of the corrugated steel plate and the support made of microcrystalline calcium silicate tiles together constitute a complete enclosure structure of the heat preservation layer of the steam pipe 1, protecting the main heat preservation layer of the pipeline from external disturbances.

[0034] See Figure 3 , in this embodiment, the support cylinder 9 is a corrugated steel plate with ribs longitudinally made of cold-rolled steel plate, and is spliced into a cylindrical shape by corrugated steel plates. Part of the ribs of the support cylinder 9 are on the inner side, facing the center of the steam pipe 1, and part of the ribs are on the outer side, away from the center of the steam pipe 1, and the rib height is 8 mm to 10 mm.

[0035] In this embodiment, the annular springboard 5 is made of thin steel plate rolled, and the annular springboard 5 is embedded in the interlayer gap of the microcrystalline calcium silicate tiles constituting the support component, and extends 100 mm from the tile gap. The multi-layer annular springboard 5 cuts the annular gap between the support component and the main heat preservation layer multiple times, that is, cuts off the annular gap between adjacent (axial) heat preservation layers common in traditional heat preservation methods, greatly weakens the heat bridge effect of the heat preservation annular gap, and improves the heat preservation performance of the main heat preservation layer.

[0036] In this application, all materials in the heat preservation pipeline are non-combustible, and are completely applicable to projects with strict fire protection requirements.

[0037] The above are all the preferred embodiments of this application, and the protection scope of this application is not limited accordingly. Therefore, all equivalent changes made according to the structure, shape, and principle of this application should be covered within the protection scope of this application.

Claims

1. A prefabricated composite heat-insulating steam pipeline, characterized in that: It includes a steam pipe (1), a main thermal insulation layer, and a housing (2). The main thermal insulation layer is sleeved outside the steam pipe (1), and the housing (2) is sleeved outside the main thermal insulation layer. Support components for supporting the steam pipe (1) are provided at both ends of the main thermal insulation layer. The support components include a first support sleeve (3) and a second support sleeve (4). The first support sleeve (3) is sleeved outside the steam pipe (1), and the second support sleeve (4) is sleeved outside the first support sleeve (3). An annular springboard (5) is clamped between the first support sleeve (3) and the second support sleeve (4). The annular springboard (5) extends towards the main thermal insulation layer to form an extension part (6). The main thermal insulation layer includes a first glass wool felt layer (7) and a second glass wool felt layer (8). The first glass wool felt layer (7) is sleeved outside the steam pipe (1) and is located between the first support sleeves (3) at both ends. A support cylinder (9) is provided between the second support sleeves (4) at both ends. The support cylinder (9) is sleeved outside the extension part (6). The second glass wool felt layer (8) is sleeved outside the support cylinder (9); A plurality of the support cylinders (9) are provided, and a plurality of the second glass wool felt layers (8) are provided, and their numbers correspond to each other; A gap is provided between the first glass wool felt layer (7) and the second glass wool felt layer (8) to form an air layer (10), and a gap is provided between two adjacent second glass wool felt layers (8) to form an air layer (10); The support cylinder (9) is a corrugated steel plate with longitudinal ribs made of cold-rolled steel plate.

2. The prefabricated composite heat-insulating steam pipeline according to claim 1, characterized in that: The support cylinder (9) is a corrugated plate with longitudinal ribs or a ribless cylinder made of cold-rolled steel plate.

3. The prefabricated composite heat-insulating steam pipeline according to claim 1, characterized in that: The annular springboard (5) is formed by rolling a thin steel plate.

4. The prefabricated composite heat-insulating steam pipeline according to any one of claims 1 to 3, characterized in that: Both the first support sleeve (3) and the second support sleeve (4) are made of microporous calcium silicate tiles.

5. The prefabricated composite heat-insulating steam pipeline according to any one of claims 1 to 3, characterized in that: The housing (2) is a steel plate housing.

6. The prefabricated composite heat-insulating steam pipeline according to claim 1, characterized in that: The inner surface of the support cylinder (9) has aluminum foil, and the outer surfaces of both the first glass wool felt layer (7) and the second glass wool felt layer (8) have aluminum foil.

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