CN111946946B - Heat-leakage-proof bent pipe heat-insulating layer and preparation method thereof - Google Patents
Heat-leakage-proof bent pipe heat-insulating layer and preparation method thereof Download PDFInfo
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- CN111946946B CN111946946B CN202010661352.7A CN202010661352A CN111946946B CN 111946946 B CN111946946 B CN 111946946B CN 202010661352 A CN202010661352 A CN 202010661352A CN 111946946 B CN111946946 B CN 111946946B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L59/00—Thermal insulation in general
- F16L59/02—Shape or form of insulating materials, with or without coverings integral with the insulating materials
- F16L59/028—Composition or method of fixing a thermally insulating material
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B15/00—Layered products comprising a layer of metal
- B32B15/04—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B15/00—Layered products comprising a layer of metal
- B32B15/04—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material
- B32B15/043—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material of metal
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B15/00—Layered products comprising a layer of metal
- B32B15/18—Layered products comprising a layer of metal comprising iron or steel
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B15/00—Layered products comprising a layer of metal
- B32B15/20—Layered products comprising a layer of metal comprising aluminium or copper
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B33/00—Layered products characterised by particular properties or particular surface features, e.g. particular surface coatings; Layered products designed for particular purposes not covered by another single class
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
- B32B7/04—Interconnection of layers
- B32B7/12—Interconnection of layers using interposed adhesives or interposed materials with bonding properties
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B9/00—Layered products comprising a layer of a particular substance not covered by groups B32B11/00 - B32B29/00
- B32B9/005—Layered products comprising a layer of a particular substance not covered by groups B32B11/00 - B32B29/00 comprising one layer of ceramic material, e.g. porcelain, ceramic tile
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B9/00—Layered products comprising a layer of a particular substance not covered by groups B32B11/00 - B32B29/00
- B32B9/04—Layered products comprising a layer of a particular substance not covered by groups B32B11/00 - B32B29/00 comprising such particular substance as the main or only constituent of a layer, which is next to another layer of the same or of a different material
- B32B9/041—Layered products comprising a layer of a particular substance not covered by groups B32B11/00 - B32B29/00 comprising such particular substance as the main or only constituent of a layer, which is next to another layer of the same or of a different material of metal
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L59/00—Thermal insulation in general
- F16L59/02—Shape or form of insulating materials, with or without coverings integral with the insulating materials
- F16L59/029—Shape or form of insulating materials, with or without coverings integral with the insulating materials layered
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L59/00—Thermal insulation in general
- F16L59/14—Arrangements for the insulation of pipes or pipe systems
- F16L59/16—Arrangements specially adapted to local requirements at flanges, junctions, valves or the like
- F16L59/22—Arrangements specially adapted to local requirements at flanges, junctions, valves or the like adapted for bends
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A30/00—Adapting or protecting infrastructure or their operation
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Abstract
The utility model provides a leak protection heat bent pipe heat preservation, includes main part heat preservation, reflection stratum, tie coat, shaping reflection stratum and outer inoxidizing coating, its characterized in that: the main body heat-insulating layer is composed of multiple layers of heat-insulating materials, the main body heat-insulating layer is divided into multiple layer groups with uniform thickness, and the reflecting layer is arranged in each layer group and is alternately superposed with each layer of heat-insulating material in each layer group to form a composite heat-insulating layer group; the heat leakage-proof heat-insulating layer of the elbow pipe prepared by the invention reduces the heat flow exchange between the inside and the outside of the upper heat-insulating layer, and the formed reflecting layer fully blocks the air convection between the splicing seams, thereby reducing the interlayer convection heat exchange. Due to the specific staggered segmentation and splicing mode, the heat conduction distance between the splicing seams is increased, and the local heat loss at the splicing seams is reduced; the prefabricated forming module is stable in size, reduces material waste, can form good fit with a bent pipe, simplifies the field construction process, reduces heat leakage caused by construction, and improves the heat preservation efficiency.
Description
Technical Field
The invention relates to the technical field of heat insulation materials, in particular to a heat-leakage-proof bent pipe heat-insulation layer and a preparation method thereof.
Background
The traditional heat-insulating material is mainly used for improving gas phase void ratio and reducing heat conductivity coefficient and conduction coefficient.
The bent pipe heat-insulating layer is mainly applied to the bent pipe position of a high-temperature pipeline and has the functions of reducing the heat dissipation loss on the surface of the bent pipe, reducing the energy consumption, reducing the environmental temperature and avoiding scalding of personnel. At present, soft cotton-shaped or cloth-shaped heat insulation materials are often used for the bent pipe heat insulation layer, the size of the heat insulation materials is cut according to the field condition, and the defects of uneven thickness and long construction period of the coated heat insulation layer exist. Fiber heat-insulating materials such as ceramic fiber felts and glass fiber felts are hard compared with cotton heat-insulating materials, multiple layers of heat-insulating materials need to be mutually overlapped to a specified thickness during installation, when a high-temperature bent pipe is coated by using the profile inorganic heat-insulating materials, all layers of heat-insulating layers need to be cut into small blocks with irregular geometric shapes and then spliced, the field construction is complex, the utilization rate of the heat-insulating materials is reduced, the heat-insulating layers are separated from one another, a plurality of seams are formed, the bent pipe cannot be well attached to the surface, the heat loss is large, the surface temperature is uneven, the expected heat-insulating effect cannot be achieved, the service life is short, and the like.
Disclosure of Invention
In view of the above technical problems, an object of the present invention is to provide a heat-leak-proof thermal insulation layer for a bent pipe, which can form a good fit with a pipe, simplify construction, reduce heat leak caused by construction and installation, and have high thermal insulation efficiency.
The invention also aims to provide a preparation method of the heat-insulating layer of the anti-heat-leakage bent pipe.
The purpose of the invention is realized by the following technical scheme:
the utility model provides a leak protection heat bent pipe heat preservation, includes main part heat preservation, reflection stratum, tie coat, shaping reflection stratum and outer inoxidizing coating, its characterized in that: the main body heat insulation layer is composed of multiple layers of heat insulation materials, the main body heat insulation layer is divided into multiple layer groups with uniform thickness, the reflecting layer is arranged in each layer group and is alternately overlapped with each layer of heat insulation material in each layer group to form a composite heat insulation layer group, and when the layers are overlapped, certain joint allowance is formed in the same direction by different layers of heat insulation materials; the main part heat preservation is ceramic fiber felt or glass fiber felt for the felt-like insulation material, individual thickness is 1~6mm, the reflection stratum is metal foil or metal-coated film, individual thickness is 0.08~0.3mm, the tie coat is fire-retardant silicon rubber and additive cerium oxide and constitutes, outer inoxidizing coating is fire-retardant dampproofing cloth or metal protection layer of high temperature resistance, above-mentioned compound insulation layer group divide into two upper and lower concatenations according to the tubular structure of return bend, the concatenation tangent plane of two upper and lower blocks is located more than the horizontal diameter, the seam tangent plane of concatenation position is the beveling form, seam position reduces gradually from inside to outside, the angle of beveling is in 90 within ranges that the horizontal diameter is the symmetry axis, the concatenation position adopts S-shaped seam seal structure.
The invention adopts a beveling downstream splicing mode with high hot surface and low cold surface, increases the area of the splicing section, thereby increasing the heat insulation reflection effect, also prolonging the heat transfer path and further relieving the transfer, forming a staggered splicing from high to low parallel bevels among the layer groups, also relieving the heat transfer, and effectively reducing the heat leakage loss by combining with S-shaped sealing suture.
Further, any one of the multiple composite heat-preservation layer groups consists of n sections, specifically, two straight ends and n-2 same sectors are spliced to form a bent pipe profile, wherein the port of the straight end and a vertical line form an inclination angle of alpha/(2 n-2), and a central angle corresponding to the sector is alpha/(n-1); the composite heat-preservation layer group adjacent to the composite heat-preservation layer group is composed of n +1 small sections, specifically, two straight ends and n-1 same sectors are spliced to form the composite heat-preservation layer group, wherein the ports of the two straight ends are vertical, and the central angle corresponding to the sectors is alpha/(n-1).
Further, the total thickness of the main body heat preservation layer is 24-100 mm, and the main body heat preservation layer is divided into 3-10 groups of uniform thickness layer groups according to the total thickness.
The preparation method of the heat-insulating layer of the heat-leakage-proof bent pipe is characterized by comprising the following steps of: two adjacent layer groups in the layer groups adopt two different segmented cutting modes to cut the material into small sections, specifically a mode I and a mode II, firstly, cutting is started at a position b/2 of any layer group away from a straight end L1 port, an included angle formed by the cutting direction and a perpendicular line at a L1 port is alpha/(2 n-2), the distance from the vertex of the included angle to the central horizontal axis of a cut material is R, cutting paths are symmetrically cut along the vertical direction, the included angle formed by two cutting lines is alpha/(n-1), the distance from the vertex of the included angle to the central horizontal axis of the material is R, cutting is continued after the axial symmetry is repeated, and finally n-2 identical isosceles trapezoid small sections are formed by cutting, wherein n is the total number of the sections formed after the material is cut in sections, R is the bending radius of the bent pipe, alpha is the angle corresponding to the bent pipe, and b is the length of the upper bottom of each isosceles trapezoid.
Further, in the second mode, a cutter is arranged at a port of a straight end L1 of a layer group adjacent to the layer group cut in the first mode, an included angle formed by a cutting path and a perpendicular line at the port of the L1 is alpha/(2 n-2), the cutting path is symmetrically cut along the vertical direction, the included angle formed by two cutting lines is alpha/(n-1), the distance from the vertex of the included angle to the horizontal central axis of the material is R, the repeated axisymmetric cutting is carried out, finally, n-1 identical isosceles trapezoid small sections are formed by cutting, the total number of the formed sections after the sectional cutting is n +1, R is the curved radius of the bent pipe, and alpha is the angle corresponding to the bent pipe.
Further, the small sections of the composite heat-preservation layer set are spliced in sequence, the spliced positions are bonded and sealed by using a flame-retardant silicon rubber bonding agent, and the bonding agent is prepared by mixing and vulcanizing phenyl silicon rubber and cerium oxide according to the mass ratio of 16: 1.
Furthermore, a layer of forming reflecting layer is bonded between the layer group and the layer group by using a bonding agent, the forming reflecting layer is made of stainless steel, the thickness of the forming reflecting layer is 0.01-0.05 mm, and the thickness of the bonding layer is not more than 1 mm.
Further, after the curing is finished, the heat insulation layer is placed in the outer protective layer, and the sealing is sewn.
The preparation method of the heat-insulating layer of the heat-leakage-proof bent pipe is characterized by comprising the following steps of:
s1: calculating the length and the width according to the size of a pipeline and the specific position of the heat-insulating layer, and cutting out a corresponding felt-shaped heat-insulating material and a corresponding reflecting layer, wherein the single-layer thickness of the felt-shaped heat-insulating material is 1-6 mm, the reflecting layer is a metal foil or a metal-plated film, and the single-layer thickness is 0.08-0.3 mm;
s2: dividing the main body heat-insulating layer into 3-10 groups of even-thickness layer groups according to the total thickness of the main body heat-insulating layer being 24-100 mm, arranging a reflecting layer in each group of layers, and alternately stacking the reflecting layer and each layer of heat-insulating material in each group of layers, wherein different layers of heat-insulating materials have certain joint allowance in the same direction during stacking;
s3: the stacked composite heat insulation layer group is rolled to be tubular, the tubular composite heat insulation layer group is cut into an upper block and a lower block along the diameter of the heat insulation layer for splicing, the joint section of the splicing position is inclined, the joint gradually decreases from inside to outside, the lowest point of the joint is overlapped with the horizontal diameter, and the relative positions of the joint cutting and the joint between different groups are staggered;
s4: any layer group is segmented and cut in a first mode: cutting is started at a port b/2 which is far from a straight end L1, an included angle formed by the cutting direction and the vertical line direction of an L1 port is alpha/(2 n-2), the distance from the vertex of the included angle to the horizontal central axis of the material is R, the cutting path is symmetrically cut along the vertical direction, the included angle formed by two cutting lines is alpha/(n-1), the distance from the vertex of the included angle to the horizontal central axis of the material is R, the axisymmetric cutting is repeated, and finally n-2 identical isosceles trapezoid small sections are formed by cutting, wherein n is the total section number formed after the material is cut in a segmented mode, R is the curved radius of a bent pipe, alpha is the angle corresponding to the bent pipe, and b is the length of the upper bottom of each isosceles trapezoid;
and the layer group adjacent to the layer group is cut in a segmented mode II: cutting at the port of the straight end L1 of the layer group, wherein the cutting direction and the vertical direction of L1 form an included angle of alpha/(2 n-2), cutting the cutting path symmetrically along the vertical direction, the included angle formed by two cutting lines is alpha/(n-1), the distance from the vertex of the included angle to the horizontal central axis of the material is R, repeating axisymmetric cutting, finally cutting to form n-1 identical isosceles trapezoid small sections, the total number of the sections formed after segmentation cutting is n +1, R is the bending radius of the bent pipe, and alpha is the angle corresponding to the bent pipe;
s5: mounting and splicing small blocks of each layer group in a tool according to the correspondence of an upper block and a lower block, wherein the splicing position is bonded and sealed by adopting a bonding agent, the opposite surfaces between the layer groups are respectively coated with a bonding layer with the thickness of not more than 1mm by using the bonding agent, and a stainless steel forming reflecting layer with the thickness of 0.01-0.05 mm is fixed, wherein the bonding agent is prepared by mixing and vulcanizing phenyl silicone rubber and cerium oxide according to the mass ratio of 16: 1;
s6: and after the bonding layer is cured, taking out the heat-insulating layer, putting the heat-insulating layer into the outer protective layer, sewing and sealing, correspondingly installing the spliced upper and lower blocks to the bent pipe, and sewing the seam by adopting S-shaped sealing.
In addition, the composite heat-preservation layer groups are highly attached to each other, so that gaps among small blocks of the composite heat-preservation layer groups are highly contracted, the gaps are reduced, heat leakage is further reduced, temperature distribution is uniform, and the phenomena of uneven temperature distribution and overhigh temperature of splicing positions of the bent pipe are overcome.
The invention has the following technical effects:
the heat exchange between the inner and outer heat flows of the upper heat-insulating layer is reduced, the air convection between the splicing seams is fully blocked by the forming reflecting layer, and the interlayer convection heat exchange is reduced. Due to the specific staggered segmentation and splicing mode, the heat conduction distance between the splicing seams is increased, and the local heat loss at the splicing seams is reduced; the prefabricated forming module is stable in size, reduces material waste, can form good fit with a bent pipe, simplifies the field construction process, reduces heat leakage caused by construction, and improves the heat preservation efficiency.
Drawings
FIG. 1: the embodiment 1 of the invention is a schematic structural diagram of a bent pipe.
FIG. 2: the schematic diagram of the manner-segmented cutting of the middle layer group is adopted in example 1.
FIG. 3: in example 1, the schematic diagram of the layer group adjacent to the intermediate layer was cut in two stages.
FIG. 4: the schematic diagram of the structure of layer group small segment splicing by means of one-segment cutting in the embodiment 1 is adopted.
FIG. 5: the schematic diagram of the layer group small segment splicing structure in the embodiment 1 is cut in a two-segment mode.
FIG. 6: schematic beveling of the various layer sets of the present invention.
Detailed Description
The present invention is described in detail below by way of examples, it should be noted that the following examples are only for illustrating the present invention and should not be construed as limiting the scope of the present invention, and those skilled in the art can make some insubstantial modifications and adaptations of the present invention based on the above-mentioned disclosure.
Example 1
The outer diameter of a pipeline at 250 ℃ is 150mm, the pipeline is provided with a 90-degree elbow with the bending radius R of 400mm, two straight ends are 150mm long respectively, a ceramic fiber felt with the thickness of 36mm is coated and insulated, the thickness of each layer of ceramic fiber felt is about 3mm, every 4 layers of ceramic fiber felts and 3 layers of 0.01mm aluminum foil reflecting layers form a group, a stainless steel with the thickness of 0.03mm is adopted as a forming reflecting layer, a binding agent is a fireproof flame-retardant high-temperature sealant, and an outer protective layer is a protective layer sewn by high-temperature-resistant waterproof cloth.
A preparation method of a heat-insulating layer of a heat-leakage-proof bent pipe is carried out according to the following scheme:
s1: calculating the length and the width according to the size of a pipeline and the specific position of the heat-insulating layer, and cutting out a corresponding felt-shaped heat-insulating material and a corresponding reflecting layer, wherein the single-layer thickness of the felt-shaped heat-insulating material is 3mm, the total thickness of the felt-shaped heat-insulating material is 36mm, the used reflecting layer is an aluminum foil reflecting layer, and the single-layer thickness of the reflecting layer is 0.01 mm;
s2: dividing the heat insulation layer into 3 groups of layers with the thickness of 12mm according to the thickness of the heat insulation material, wherein each layer group consists of 4 layers of ceramic fiber felt heat insulation materials, an aluminum foil is used as a reflecting layer and is alternately superposed with each layer of heat insulation material, and the 4 layers of heat insulation materials and the 3 layers of reflecting layers form a complete composite heat insulation layer group;
s3: the stacked composite heat-insulating layer group is rolled to be tubular, the tubular composite heat-insulating layer group is cut into an upper block and a lower block along the diameter of the heat-insulating layer, and the relative positions of the cutting seams and the joints among different groups are staggered;
s4: cutting is started at a position b/2 away from a straight end L1 port of a layer group in the middle of the heat preservation layer, an included angle formed by the cutting direction and a vertical line at a port L1 is 5 degrees, the distance from the vertex of the included angle to a horizontal central axis of the material is 400mm, cutting is conducted after the cutting path is symmetrical along the vertical direction, the included angle formed by two cutting lines is 10 degrees, the distance from the vertex of the included angle to the horizontal central axis of the material is 400mm, cutting is conducted after axial symmetry is repeated, 8 identical isosceles trapezoid small sections are finally formed by cutting, the length of the upper bottom of each isosceles trapezoid is b, and the total number of the sections formed after the material is cut in a segmented mode is 10 sections;
and the layer group adjacent to the layer group is cut in a segmented mode II: cutting at the port of the straight end L1 of the layer group, wherein an included angle formed by the cutting direction and the vertical direction of L1 is 5 degrees, cutting paths are symmetrically cut along the vertical direction, the included angle formed by two cutting lines is 10 degrees, the distance from the vertex of the included angle to the horizontal central axis of the material is R, repeating the axisymmetric cutting, finally cutting to form 9 identical isosceles trapezoid small sections, and the total number of the sections formed after the subsection cutting is 11;
s5: mounting and splicing small blocks of each layer group in a tool according to the correspondence of an upper block and a lower block, wherein the splicing positions are bonded and sealed by adopting a bonding agent, the opposite surfaces between the layer groups are respectively coated with a bonding layer with the thickness of 0.2mm, and a stainless steel forming reflecting layer with the thickness of 0.02mm is fixed, wherein the bonding agent is prepared by mixing and vulcanizing phenyl silicone rubber and cerium oxide according to the mass ratio of 16: 1;
s6: and after the bonding layer is cured, taking out the heat-insulating layer, putting the heat-insulating layer into the outer protective layer, sewing and sealing, and correspondingly installing the spliced upper and lower blocks to the surface of the bent pipe, wherein the upper and lower blocks are sealed and sewn in an S shape.
Comparative example 1
The same ceramic fiber felt material as that in the embodiment 1 and the same thickness of 36mm are directly cut into irregular geometric small blocks, then the small blocks are superposed on the surface of the bent pipe, and a protective layer is sleeved on the small blocks to form the heat insulation layer.
After the heat-insulating layer of the comparative example 1 is used, the heat-insulating performance is poor due to the poor fitting degree of the heat-insulating layer and the bent pipe, the lowest temperature of the bent pipe is 63 ℃, the temperature distribution is uneven, the heat leakage at the splicing seam position is large, the temperature is obviously high, and the highest temperature is 71 ℃.
After the bent pipe heat leakage prevention heat preservation layer prepared in the embodiment 1 of the invention is adopted, the heat preservation performance is excellent, and the detected bent pipe surface temperature distribution is uniform and is 47-51 ℃.
Claims (7)
1. The utility model provides a leak protection heat bent pipe heat preservation, includes main part heat preservation, reflection stratum, tie coat, shaping reflection stratum and outer inoxidizing coating in proper order, its characterized in that: the main body heat-insulating layer is composed of multiple layers of heat-insulating materials, the main body heat-insulating layer is divided into multiple layer groups with uniform thickness, and the reflecting layer is arranged in each layer group and is alternately superposed with each layer of heat-insulating material in each layer group to form a composite heat-insulating layer group; the main body heat preservation layer is a ceramic fiber felt or a glass fiber felt, the thickness of a single layer is 1-6 mm, the reflecting layer is a metal foil or a metal-plated film, the thickness of the single layer is 0.08-0.3 mm, the bonding layer is composed of phenyl silicone rubber and cerium oxide, the outer protection layer is a high-temperature-resistant flame-retardant damp-proof cloth or a metal protection layer, the composite heat preservation layer is formed by splicing an upper block and a lower block, the splicing positions of the upper block and the lower block are located above the horizontal diameter, the joint section of the splicing positions is inclined, the joint gradually decreases from inside to outside, the lowest point of the joint is coincided with the horizontal diameter, the oblique cutting angle is within 90 degrees taking the horizontal diameter as a symmetry axis, and the splicing positions adopt S-shaped sewing sealing structures; any one composite heat-preservation layer group consists of n small sections, specifically, two straight ends and n-2 same sectors are spliced to form a bent pipe profile, wherein the port of the straight end and a vertical line form an inclination angle of alpha/(2 n-2), and the central angle corresponding to the sector is alpha/(n-1); the composite heat-preservation layer group adjacent to the composite heat-preservation layer group is composed of n +1 small sections, specifically, two straight ends and n-1 same sectors are spliced to form the composite heat-preservation layer group, wherein the ports of the two straight ends are vertical, and the central angle corresponding to the sectors is alpha/(n-1).
2. The heat insulating layer for preventing heat leak of claim 1, wherein: the total thickness of the main body heat preservation layer is 24-100 mm, and the main body heat preservation layer is divided into 3-10 groups of uniform thickness layer groups according to the total thickness.
3. The method for preparing the heat-insulating layer for the heat-leak-proof bent pipe according to claim 1 or 2, wherein: two adjacent layer groups in the layer groups adopt two different segmental cutting modes to cut the material into small sections, specifically a mode I and a mode II, firstly, cutting is started at a position b/2 of any layer group away from a straight end L1 port, an included angle formed by the cutting direction and a perpendicular line at a L1 port is alpha/(2 n-2), the distance from the vertex of the included angle to the central horizontal axis of a cut material is R, cutting paths are symmetrically cut along the vertical direction, the included angle formed by two cutting lines is alpha/(n-1), the distance from the vertex of the included angle to the central horizontal axis of the material is R, cutting is continued after the axial symmetry is repeated, and finally n-2 identical isosceles trapezoid small sections are formed by cutting, wherein n is the total number of the sections formed after the material is cut in sections, R is the bending radius of the bent pipe, alpha is the angle corresponding to the bent pipe, and b is the length of the upper bottom of each isosceles trapezoid.
4. The method for preparing the heat-insulating layer of the leak-proof heat bent pipe according to claim 3, wherein the method comprises the following steps: and secondly, cutting at the port of a straight end L1 of the layer group adjacent to the layer group cut in the first cutting mode, wherein an included angle formed by the cutting path and a perpendicular line at the port of the L1 is alpha/(2 n-2), the cutting path is symmetrically cut along the vertical direction, the included angle formed by two cutting lines is alpha/(n-1), the distance from the vertex of the included angle to the horizontal central axis of the material is R, the cutting is repeated axially symmetrically, the final cutting is performed to form n-1 identical isosceles trapezoid small sections, the total number of the sections formed after the cutting in sections is n +1, R is the radius of curvature of the bent pipe, and alpha is the angle corresponding to the bent pipe.
5. The method for preparing the heat-insulating layer of the leak-proof heat bent pipe according to claim 4, wherein the method comprises the following steps: the small sections of the composite heat-insulation layer set are spliced in sequence, and the spliced parts are bonded and sealed by using a flame-retardant silicone rubber adhesive.
6. The method for preparing the heat-insulating layer of the leak-proof heat bent pipe according to claim 5, wherein the method comprises the following steps: two opposite surfaces between the bed set and the bed set respectively coat one deck tie coat, fixed one deck shaping reflection stratum, the shaping reflection stratum is stainless steel, and thickness is 0.01~0.05 mm.
7. The preparation method of the heat-insulating layer of the heat-leakage-proof bent pipe is characterized by comprising the following steps of:
s1: calculating the length and the width according to the size of a pipeline and the specific position of the heat-insulating layer, and cutting out a corresponding felt-shaped heat-insulating material and a corresponding reflecting layer, wherein the single-layer thickness of the felt-shaped heat-insulating material is 1-6 mm, the reflecting layer is a metal foil or a metal-plated film, and the single-layer thickness is 0.08-0.3 mm;
s2: dividing the main body heat-insulating layer into 3-10 groups of even-thickness layer groups according to the total thickness of the main body heat-insulating layer being 24-100 mm, arranging a reflecting layer in each group of layers, and alternately stacking the reflecting layer and each layer of heat-insulating material in each group of layers, wherein different layers of heat-insulating materials have certain joint allowance in the same direction during stacking;
s3: the stacked composite heat insulation layer group is rolled to be tubular, the tubular composite heat insulation layer group is cut into an upper block and a lower block along the diameter of the heat insulation layer for splicing, the joint section of the splicing position is inclined, the joint gradually decreases from inside to outside, the lowest point of the joint is overlapped with the horizontal diameter, and the relative positions of the joint cutting and the joint between different groups are staggered;
s4: any layer group is segmented and cut in a first mode: cutting is started at a port b/2 which is far from a straight end L1, an included angle formed by the cutting direction and the vertical line direction of an L1 port is alpha/(2 n-2), the distance from the vertex of the included angle to the horizontal central axis of the material is R, the cutting path is symmetrically cut along the vertical direction, the included angle formed by two cutting lines is alpha/(n-1), the axisymmetric cutting is repeated, and finally n-2 identical isosceles trapezoid small sections are formed by cutting, wherein n is the total number of the sections formed after the material is cut in a segmenting mode, alpha is the angle corresponding to a bent pipe, and b is the length of the upper bottom of each isosceles trapezoid;
and the layer group adjacent to the layer group is cut in a segmented mode II: cutting at the port of the straight end L1 of the layer group, wherein the cutting direction and the vertical direction of L1 form an included angle of alpha/(2 n-2), cutting the cutting path symmetrically along the vertical direction, the included angle formed by two cutting lines is alpha/(n-1), repeating axisymmetric cutting, finally cutting to form n-1 identical isosceles trapezoid small sections, and the total number of the sections formed after segmentation cutting is n + 1;
s5: mounting and splicing the small blocks of each layer group in a tool according to the correspondence of the upper block and the lower block, bonding and sealing the splicing positions by adopting a bonding agent, coating a bonding layer between the layer groups by using the bonding agent, and fixing a stainless steel forming reflecting layer with the thickness of 0.01-0.05 mm;
s6: and after the bonding layer is cured, taking out the heat-insulating layer, putting the heat-insulating layer into the outer protective layer, sewing and sealing, correspondingly installing the spliced upper and lower blocks to the bent pipe, and sewing the seam by adopting S-shaped sealing.
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| CN114811270A (en) | 2022-07-29 |
| CN114811270B (en) | 2023-04-18 |
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