Composite tube bundle structure based on aerogel heat preservation layer and spraying device

Abstract

The invention relates to the technical field of pipeline heat preservation, in particular to a composite tube bundle structure based on an aerogel heat preservation layer and a spraying device.The composite tube bundle structure comprises a pipeline body, a first heat preservation layer, an insulating layer, an electric tracing band, a second heat preservation layer and a sheath layer; the aerogel spraying device comprises an annular base and a plurality of main nozzles, a driving mechanism is arranged on the annular base, the main nozzles are annularly and evenly distributed on one side of the annular base around the axis of the annular base through the driving mechanism, all the main nozzles extend in the radial direction of the annular base, and the driving mechanism is used for driving all the main nozzles to move and adjust in the radial direction of the annular base at the same time. The double-layer aerogel coating is adopted as the heat preservation layer, the heat conductivity coefficient and the density of aerogel are smaller than those of traditional heat preservation materials, under the same heat preservation effect, the thickness of the needed heat preservation layer can be reduced by 50%-70%, the overall diameter of the tube bundle is greatly reduced, the tube bundle is particularly suitable for space-limited places, the weight of the overall tube bundle is reduced by 30%-60%, and the heat preservation effect is good. And the support requirement and the transportation and installation cost are reduced.

Description

Technical Field

[0001] This invention relates to the field of pipeline insulation technology, specifically to a composite pipe bundle structure based on an aerogel insulation layer and a spraying device. Background Technology

[0002] Pipeline heat tracing and insulation technology is an active insulation method that maintains or increases the temperature of the medium inside the pipeline by adding heating measures. Its core is to lay heat tracing tape (such as electric heat tracing, steam heat tracing, etc.) on the outside or inside of the pipeline and cover it with an insulation layer to compensate for the heat loss of the pipeline, prevent the medium from solidifying, crystallizing or increasing in viscosity due to low temperature, and ensure normal fluid transportation.

[0003] Common pipe insulation often uses materials such as fiberglass wool, rock wool, and rubber and plastic for wrapping and filling. To achieve the ideal insulation effect, thicker wrapping materials are required, which leads to a significant increase in the overall pipe diameter and thus a large overall pipe space occupation. Traditional insulation materials have a high density, which increases the load on the pipe support structure and requires multiple layers of wrapping and binding, making the pipe bundle construction difficult and prone to insulation dead corners.

[0004] As a novel thermal insulation material, how to apply aerogel to pipeline insulation has become an urgent problem to be solved in the field of pipeline heat tracing and insulation. In addition, aerogel is often formed by on-site spraying in the form of slurry, but the aerogel spraying equipment on the market is mainly designed for flat or simple vertical surfaces. Pipes are circular three-dimensional curved surfaces, and the existing spraying equipment is not suitable, especially at the protruding structures formed by the heat tracing tape that is closely attached to the pipe wall. During spraying, excessive accumulation of aerogel material or insufficient coverage is likely to occur, which affects the forming quality of the aerogel layer. Summary of the Invention

[0005] The purpose of this invention is to provide a composite tube bundle structure and spraying device based on an aerogel insulation layer to solve the technical problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution.

[0007] A composite tube bundle structure based on an aerogel insulation layer includes a pipe body, an insulation layer, an electric heating tape, and a sheath layer. An aerogel is sprayed onto the outside of the pipe body using a spraying device to form a first insulation layer, and the insulation layer covers the outside of the first insulation layer. The electric heating tape is attached to the outside of the insulation layer and extends along the length of the pipe body. An aerogel is sprayed onto the outside of the insulation layer using a spraying device to form a second insulation layer, and the second insulation layer covers the electric heating tape. The sheath layer covers the outside of the second insulation layer.

[0008] Preferably, the aerogel is one or more composites of silica aerogel, ceramic aerogel, or polymer aerogel.

[0009] This invention also provides an aerogel spraying device, applied in the aerogel spraying process of the aforementioned composite tube bundle structure based on an aerogel insulation layer. The device includes an annular seat and several main nozzles. A driving mechanism is provided on the annular seat. The main nozzles are evenly distributed in a ring around the axis of the annular seat via the driving mechanism on one side of the annular seat. Each main nozzle extends radially along the annular seat. The driving mechanism is used to drive each main nozzle to move and adjust simultaneously radially along the annular seat. A paint dispensing unit is provided on the annular seat. The uppermost main nozzle is defined as the first nozzle. One of the annular seats... Two auxiliary nozzles are provided on the side, symmetrically distributed on both sides of the first nozzle and arranged in an inverted figure-eight shape. The first nozzle and the two auxiliary nozzles are connected to the feeding equipment through the paint distribution unit. When each main nozzle moves radially along the annular seat towards the axis of the annular seat to its limit position, the auxiliary nozzles are not connected to the feeding equipment and are used to spray to form the first insulation layer. When each main nozzle moves radially along the annular seat towards the side opposite to the axis of the annular seat to its limit position, the first nozzle and the two auxiliary nozzles are connected to the feeding equipment and are used to spray to form the second insulation layer.

[0010] Preferably, the top surface of the electric heat tracing cable is defined as the top surface of the heat tracing cable, and the side surface of the electric heat tracing cable is defined as the side surface of the heat tracing cable; the two side surfaces of the heat tracing cable and the outer wall of the insulation layer are respectively formed with angled gaps; when spraying the second insulation layer, the spraying range of the first nozzle covers the top surface of the heat tracing cable, the spraying range of the auxiliary nozzle covers the side surface of the heat tracing cable, and the spraying ranges of the first nozzle and the auxiliary nozzle overlap at the top corner of the electric heat tracing cable.

[0011] Preferably, the two main nozzles adjacent to each other on both sides of the first nozzle are defined as the second nozzles; when spraying the second insulation layer, the spraying range of the second nozzles covers the gap at the included angle on the same side, and the spraying range of the second nozzles overlaps with the spraying range of the auxiliary nozzles on the same side.

[0012] Preferably, the drive mechanism includes a traction disc, a drive unit, several connecting rods, and several sliding seats; several grooves are equidistantly formed on the annular seat around its axis, and each groove extends radially along the annular seat; a sliding seat is slidably installed in each groove, and a connecting rod is fixed to the side of each sliding seat; the connecting rod is parallel to the axis of the annular seat; the traction disc is rotatably installed on the side of the annular seat and is coaxial with the annular seat; several arc-shaped guide grooves are evenly distributed on the traction disc around its axis, one end of each arc-shaped guide groove is close to the inner edge of the traction disc, and the other end is close to the outer edge of the traction disc; each connecting rod passes through the arc-shaped guide groove one by one, and the connecting rod is movably connected to the inner wall of the arc-shaped guide groove; each main nozzle is fixed to the end of the corresponding connecting rod; the drive unit is located on one side of the annular seat and is used to drive the traction disc to rotate and adjust.

[0013] Preferably, the drive unit includes a drive motor and a gear; a gear ring is fixed to the side of the traction disc, and the gear ring is coaxial with the traction disc; the drive motor is fixed to the side of the ring seat by a mounting base, and the gear is fixed to the output shaft of the drive motor; the gear and the gear ring mesh accordingly.

[0014] Preferably, the paint dispensing unit includes a dispensing seat, a guide pipe, a supply pipe, and a pair of distribution pipes; the dispensing seat is fixed to the side of the annular seat by a connecting frame, and a vertically extending vertical hole is opened in the dispensing seat; a metal guide pipe is vertically fixed on the first spray head; the top end of the guide pipe is inserted into the vertical hole from the bottom of the dispensing seat and is slidably sealed to the inner wall of the vertical hole; the first spray head communicates with the vertical hole through the guide pipe; two flow holes are symmetrically opened on the guide pipe; one end of the supply pipe is connected to the top of the vertical hole and the other end is connected to the feeding device; one end of the distribution pipe is connected to the corresponding auxiliary spray head, and the other end extends through into the dispensing seat, and the port of the distribution pipe is slidably sealed to the outer wall of the guide pipe.

[0015] Preferably, when the first insulation layer is formed by spraying, the flow hole is located below the port of the material distribution pipe located in the distribution seat, and the flow hole is blocked by the inner wall of the vertical hole, and the port of the material distribution pipe located in the distribution seat is blocked by the outer wall of the guide pipe; when the second insulation layer is formed by spraying, the flow hole and the port of the material distribution pipe located in the distribution seat are aligned and connected respectively.

[0016] Preferably, an electric valve is installed on the feed pipe.

[0017] Compared with the prior art, the beneficial effects of the present invention are as follows.

[0018] This invention uses a double-layer aerogel coating as the insulation layer. Because the thermal conductivity and density of aerogel are lower than those of traditional insulation materials, the required insulation layer thickness can be reduced by 50%-70% under the same insulation effect, thereby significantly reducing the overall diameter of the tube bundle. This is particularly suitable for space-constrained locations, and the overall weight of the tube bundle is reduced by 30%-60%, lowering support requirements and transportation and installation costs. The insulation coating formed by silica aerogel spraying is a solid continuous layer, eliminating the need for glass fiber construction. The material itself is stable, releases no harmful substances, and has a long service life.

[0019] The spraying device used in this invention is equipped with multiple main nozzles and two auxiliary nozzles. The position of the nozzles is adjusted by the drive mechanism so that the nozzles adapt to the circular curved surface of the pipe body and the raised structure formed by the electric heating cable. When spraying the second insulation layer, the spraying range of the first nozzle and the auxiliary nozzles overlaps at the corner of the top surface of the heating cable, and the second nozzle covers the gap area at the corner. This ensures that the coating is evenly distributed on the uneven parts formed by the electric heating cable, avoids material accumulation or missed coating, and improves the overall molding quality and insulation consistency of the aerogel layer.

[0020] This invention achieves the switching of paint supply through a paint distribution unit. When spraying the first insulation layer, only the first nozzle dispenses paint, while when spraying the second insulation layer, the first nozzle and the auxiliary nozzle dispense paint simultaneously. There is no need to replace the nozzle or adjust the pipeline, and there is no need to equip different spraying fixtures, thus reducing investment costs.

[0021] This invention enables the main nozzle and the first nozzle to adjust their positions simultaneously via a drive mechanism, while also moving the guide tube synchronously to switch the material supply path of the paint distribution unit. This linkage design achieves synchronization between the radial position adjustment of the nozzle and the switching of the material supply state, eliminating the need for an additional independent supply path control actuator or sensor. This ensures that the paint supply mode matches the spraying contour during the spraying process, while simplifying the control system of the device and improving the overall reliability and response speed of the operation. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the overall composite tube bundle structure based on the aerogel insulation layer; Figure 2 A schematic diagram of the structure of the spraying device mounted on the spraying frame; Figure 3 This is a schematic diagram of the overall structure of the spraying device; Figure 4 for Figure 3 A partial structural diagram of the structure shown; Figure 5 This is one of the schematic diagrams of a partial structure of the drive mechanism of a spraying device; Figure 6 This is the second partial structural diagram of the drive mechanism of the spraying device; Figure 7 This is a schematic diagram of the paint dispensing mechanism of the spraying device; Figure 8 A schematic diagram of the structure for forming the first insulation layer by spraying with a spraying device; Figure 9 A schematic diagram showing the connection between the distribution pipe and the flow hole; Figure 10 A schematic diagram of the structure for spraying the second insulation layer using a spraying device.

[0023] In the diagram: 01. Pipe body; 02. First insulation layer; 03. Insulation layer; 04. Electric heating tape; 05. Second insulation layer; 06. Sheath layer; 07. Spraying frame; 071. Support base; 041. Top surface of heating tape; 042. Side surface of heating tape; 043. Angle gap; 1. Annular seat; 11. Through hole; 2. Drive mechanism; 201. Slide groove; 21. Traction disc; 211. Arc-shaped guide groove; 22. Drive unit; 221, drive motor; 222, gear; 223, gear ring; 23, connecting rod; 24, sliding seat; 3, main nozzle; 31, first nozzle; 32, second nozzle; 4, auxiliary nozzle; 41, connecting arm; 5, paint distribution unit; 501, connecting frame; 51, distribution seat; 511, vertical hole; 52, guide pipe; 521, flow hole; 53, distribution pipe; 54, supply pipe; 541, electric valve. Detailed Implementation

[0024] The present invention will be further described in detail below with reference to the embodiments: This invention is not limited to the specific embodiments listed below. Those skilled in the art can implement this invention using various other specific embodiments based on the content disclosed herein. Any modifications or alterations made to the design structure and concept of this invention fall within the protection scope of this invention. It should be noted that, unless otherwise specified, the embodiments and features described in this invention can be combined with each other.

[0025] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0026] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art will understand the specific meaning of the above terms in this invention based on the specific circumstances. Example 1

[0027] Please see Figures 1-10 This invention provides a composite tube bundle structure based on an aerogel insulation layer, comprising a pipe body 01, an insulation layer 03, an electric heating tape 04, and a sheath layer 06. An aerogel is sprayed onto the outside of the pipe body 01 to form a first insulation layer 02. The insulation layer 03 covers the outside of the first insulation layer 02. The electric heating tape 04 is attached to the outside of the insulation layer 03 and extends along the length of the pipe body 01. An aerogel is sprayed onto the outside of the insulation layer 03 to form a second insulation layer 05. The second insulation layer 05 covers the electric heating tape 04. The sheath layer 06 covers the outside of the second insulation layer 05.

[0028] The aerogel used is silica aerogel, which has a thermal conductivity of less than 0.02 W / (m·K), much lower than that of glass fiber cotton (0.04 W / (m·K)). Under the same insulation effect, the required insulation layer thickness can be reduced by 50%-70%, thereby significantly reducing the overall diameter of the tube bundle, making it particularly suitable for space-constrained locations (such as equipment compartments and dense pipe corridors). In addition, silica aerogel has a density of 0.2 g / cm³, and the coating structure replaces the traditional heavy filling and wrapping, reducing the overall weight of the tube bundle by 30%-60%, thus reducing support requirements and transportation and installation costs.

[0029] The insulating coating formed by silica aerogel spraying is a solid continuous layer that does not require the construction of glass fiber. The material itself is stable, releases no harmful substances, and has a long service life, reducing the need for replacement waste.

[0030] Aerogel spraying is performed using a spraying device to ensure a smooth and continuous coating appearance. At the same time, the spraying process can adapt to tube bundles with complex shapes, achieving full coverage without dead angles, and providing more uniform and reliable thermal insulation performance.

[0031] In addition, the insulation layer 03 is made of polyetheretherketone, which has both insulation and good radiation resistance, and is used to protect the pipeline heat tracing and insulation structure from external mechanical damage, chemical corrosion, ultraviolet rays and environmental radiation. The sheath layer 06 is a PVC covering layer, a thin metal foil covering layer or a composite film covering layer, which provides effective external protection for the pipeline heat tracing and insulation structure. Example 2

[0032] Please see Figures 2-10 This embodiment provides an aerogel spraying device, which is applied to the aerogel spraying process of the composite tube bundle structure based on the aerogel insulation layer in Embodiment 1. The spraying device can spray both the first insulation layer 02 and the second insulation layer 05. Specifically, it includes an annular seat 1 and six main nozzles 3. The middle of the annular seat 1 is a through hole 11 for the pipeline heat tracing and insulation structure to pass through. A drive mechanism 2 is provided on the annular seat 1. The six main nozzles 3 are evenly distributed in a ring around the axis of the annular seat 1 through the drive mechanism 2. Each main nozzle 3 extends radially along the annular seat 1. The drive mechanism 2 is used to drive each main nozzle 3 to move and adjust radially along the annular seat 1 at the same time.

[0033] Two connecting arms 41 are fixed to the side of the annular seat 1. Each of the two connecting arms 41 is fixed with an auxiliary nozzle 4. The annular seat 1 is provided with a paint distribution unit 5. The uppermost main nozzle 3 is defined as the first nozzle 31. The two auxiliary nozzles 4 are symmetrically distributed on both sides of the first nozzle 31 and arranged in an inverted figure-eight shape. The first nozzle 31 and the two auxiliary nozzles 4 are connected to the feeding device (not shown in the figure) through the paint distribution unit 5. Each main nozzle 3 other than the first nozzle 31 is connected to the feeding device through the remaining pipes. The feeding device is used to pump the aerogel paint to each main nozzle 3.

[0034] When each main nozzle 3 moves radially along the annular seat 1 towards the axis of the annular seat 1 to its limit position, the auxiliary nozzle 4 is not connected to the material supply equipment and is used to spray and form the first insulation layer 02. When each main nozzle 3 moves radially along the annular seat 1 towards the side opposite to the axis of the annular seat 1 to its limit position, the first nozzle 31 and the two auxiliary nozzles 4 are connected to the material supply equipment and are used to spray and form the second insulation layer 05.

[0035] The bottom of the ring seat 1 is fixed with a support seat 071, which is fixed on the spraying frame 07. The entire spraying device is fixed above the spraying frame 07. In addition, the spraying frame 07 is also equipped with a traction mechanism for traction of the pipeline heat tracing and insulation structure to facilitate continuous spraying.

[0036] The working principle of this embodiment is as follows: When spraying the first insulation layer 02, the pipe body 01 is passed through the through hole 11, and at the same time, the drive mechanism 2 drives each main nozzle 3 to move to its limit position along the axis of the annular seat 1, so that each nozzle reaches the first spraying position. At this time, the material supply device is only connected to the first nozzle 31 through the paint distribution unit 5. The material supply device supplies paint to the first nozzle 31 and the remaining main nozzles 3 and sprays it out. Figure 8As shown (the dashed lines in the figure indicate the spray range section of each nozzle), since the first nozzle 31 and the other main nozzles 3 are evenly distributed, the spray range formed can cover the entire circumference of the pipe body 01. At the same time, the traction mechanism pulls the pipe body 01 to continuously feed, so that the outside of the pipe body 01 can be continuously sprayed. After the spraying is completed and dried, the first insulation layer 02 is formed on the outside of the pipe body 01. Then, the insulation layer 03 is wrapped around the outside, and the electric heating tape 04 is attached to the outside of the insulation layer 03, completing the preparation before the second insulation layer 05 is sprayed.

[0037] When spraying the second insulation layer 05, the first nozzle 31 and each main nozzle 3 are first driven by the drive mechanism 2 to move to the extreme position on the side away from the axis of the annular seat 1, so that each nozzle reaches the second spraying position. At this time, the material supply device is connected to the first nozzle 31 and the two auxiliary nozzles 4 through the paint distribution unit 5. The material supply device supplies paint to the first nozzle 31, the auxiliary nozzles 4 and the remaining main nozzles 3 and sprays it onto the insulation layer 03. Among them, such as Figure 10 As shown (the dashed lines in the figure indicate the spray range cross-section of each nozzle), the top surface of the electric heating cable 04 is defined as the top surface 041, and the side surface of the electric heating cable 04 is defined as the side surface 042. Angle gaps 043 are formed between the two side surfaces 042 and the outer wall of the insulation layer 03. When spraying the second insulation layer 05, the spray range of the first nozzle 31 covers the top surface 041 of the heating cable, and the spray range of the auxiliary nozzle 4 covers the side surface 042 of the heating cable. The spray ranges of the first nozzle 31 and the auxiliary nozzle 4 overlap at the top corner of the electric heating cable 04. Two adjacent main nozzles on either side of the first nozzle 31 are defined. All three nozzles are second nozzles 32. When spraying the second insulation layer 05, the spraying range of the second nozzle 32 covers the same-side included angle gap 043, and the spraying range of the second nozzle 32 overlaps with the spraying range of the same-side auxiliary nozzle 4. Thus, the spraying range of the first nozzle 31, the two auxiliary nozzles 4, and the two second nozzles 32 is sufficient to cover the protruding and recessed structures formed by the electric heating tape 04. The remaining main nozzles 3 combined with the spraying range of the two second nozzles 32 are sufficient to cover the remaining positions outside the insulation layer 03. Even when the electric heating tape 04 is attached to the outside of the insulation layer 03, the coating can be sprayed evenly.

[0038] Since the insulation layer 03 is relatively thick and the electric heating tape 04 occupies a certain space, when spraying the second insulation layer 05, the first nozzle 31 and each main nozzle 3 are simultaneously adjusted to the side away from the axis of the annular seat 1. This can increase the distance between the corresponding nozzle and the outer wall of the insulation layer 03 (the cross-section of the nozzle spraying range is approximately triangular, and the larger the distance, the wider the coverage area will be), ensuring that the spraying range of each nozzle is compatible with the external structure formed by the electric heating tape 04 and the insulation layer 03.

[0039] This spraying device can meet the spraying requirements of both the first insulation layer 02 and the second insulation layer 05, without the need for different spraying fixtures, thus reducing investment costs.

[0040] In addition, multiple spraying devices can be installed on the spraying stand 07 (arranged at intervals along the axis of the annular seat 1). By operating the spraying devices at the corresponding positions, the coating thickness can be controlled accordingly, and the uniformity of the coating distribution can be further improved. Example 3

[0041] Please see Figure 3 , Figure 5 and Figure 6 Based on the foregoing embodiments, this embodiment provides a detailed description of the drive mechanism 2 in Embodiment 2, as follows: The drive mechanism 2 includes a traction disc 21, a drive unit 22, several connecting rods 23, and several sliding seats 24. A plurality of grooves 201 are equidistantly spaced around the axis of the annular seat 1, each groove 201 extending radially along the annular seat 1. A sliding seat 24 is slidably mounted within each groove 201, and a connecting rod 23 is fixed to the side of each sliding seat 24. The connecting rod 23 is parallel to the axis of the annular seat 1. The traction disc 21 is rotatably mounted on the side of the annular seat 1 and remains coaxial with the annular seat 1. Several arc-shaped guide grooves 211 are evenly distributed around the axis of the disc 21. One end of each arc-shaped guide groove 211 is close to the inner edge of the traction disc 21, and the other end is close to the outer edge of the traction disc 21. Each connecting rod 23 passes through the arc-shaped guide groove 211 in a corresponding manner, and the connecting rod 23 is movably connected to the inner wall of the arc-shaped guide groove 211. Each main nozzle 3 is fixed on the end of the corresponding connecting rod 23. The drive unit 22 is set on one side of the annular seat 1 and is used to drive the traction disc 21 to rotate and adjust.

[0042] like Figure 5 As shown, the drive unit 22 includes a drive motor 221 and a gear 222. A gear ring 223 is fixed on the side of the traction disc 21, and the gear ring 223 is coaxial with the traction disc 21. The drive motor 221 is fixed on the side of the ring seat 1 through a mounting base. The gear 222 is fixed on the output shaft of the drive motor 221, and the gear 222 meshes with the gear ring 223.

[0043] When the drive motor 221 is working, its output shaft drives the gear 222 to rotate. Under the meshing transmission of the gear 222 and the gear ring 223, the gear 222 can drive the traction disc 21 to rotate. When the traction disc 21 rotates forward, under the limiting and guiding effect of the arc-shaped guide groove 211 on the connecting rod 23, the connecting rod 23 and the sliding seat 24 are pulled as a whole towards the axis of the ring seat 1. When the traction disc 21 rotates in reverse, under the limiting and guiding effect of the arc-shaped guide groove 211 on the connecting rod 23, the connecting rod 23 and the sliding seat 24 are pulled as a whole away from the axis of the ring seat 1, thereby realizing the position adjustment of each nozzle. Each nozzle (except the auxiliary nozzle 4) shares the same set of adjustment drive structure, reducing the investment in drive cost. Example 4

[0044] Please see Figure 4 and Figure 7 Based on the foregoing embodiments, this embodiment provides a detailed description of the paint dispensing unit 5 in Embodiment 2, as follows: Specifically, the paint dispensing unit 5 includes a dispensing seat 51, a guide tube 52, a supply tube 54, and a pair of distributing tubes 53. The dispensing seat 51 is fixed to the side of the annular seat 1 by a connecting bracket 501. A vertically extending vertical hole 511 is opened inside the dispensing seat 51. A metal guide tube 52 is vertically fixed on the first nozzle 31. The guide tube 52 is a metal tube to prevent deformation. The top end of the guide tube 52 is inserted into the vertical hole 511 from the bottom of the dispensing seat 51 and is slidably sealed to the inner wall of the vertical hole 511 (the specific sealing connection method adopts existing technology). (Details omitted) The first nozzle 31 is connected to the vertical hole 511 through the guide pipe 52. Two flow holes 521 are symmetrically opened on the guide pipe 52. One end of the feed pipe 54 is connected to the top of the vertical hole 511, and the other end is connected to the feeding device. One end of the distribution pipe 53 is connected to the corresponding auxiliary nozzle 4, and the other end extends through to the distribution seat 51. The port of the distribution pipe 53 is in a sealed sliding fit with the outer wall of the guide pipe 52. The feeding device pumps the paint into the vertical hole 511 through the feed pipe 54, and then distributes the paint according to the actual working conditions.

[0045] When the first insulation layer 02 is formed by spraying, the first nozzle 31 and each main nozzle 3 move to their limit positions on one side of the axis of the annular seat 1. At this time, as Figure 7 As shown, the flow hole 521 is located below the port of the distribution pipe 53 located inside the distribution seat 51, and the flow hole 521 is blocked by the inner wall of the vertical hole 511. The port of the distribution pipe 53 located inside the distribution seat 51 is blocked by the outer wall of the guide pipe 52. The paint entering the guide pipe 52 through the vertical hole 511 is sprayed out only from the first nozzle 31, ensuring that the first nozzle 31 discharges the paint and the two auxiliary nozzles 4 do not discharge the paint.

[0046] When the second insulation layer 05 is formed by spraying, the first nozzle 31 and each main nozzle 3 move to their limit positions on the side opposite to the axis of the annular seat 1, such as... Figure 7 As shown, the guide tube 52 slides upward relative to the vertical hole 511. At this time, the flow hole 521 and the port of the distribution tube 53 located in the distribution seat 51 are aligned and connected. The paint part entering the guide tube 52 through the vertical hole 511 is sprayed out through the first nozzle 31, and the other part is diverted to the auxiliary nozzle 4 through the distribution tube 53 and sprayed out, ensuring that the first nozzle 31 discharges material and the two auxiliary nozzles 4 discharge material.

[0047] like Figure 4 As shown, an electric valve 541 is installed on the feed pipe 54. The electric valve 541 is a flow valve and is controlled by the controller. During spraying, it is convenient to adjust the feed flow rate according to actual needs.

[0048] The control method of this invention is automatic control through a controller. The control circuit of the controller can be implemented by simple programming by those skilled in the art. The power supply is also common knowledge in the art. Furthermore, since this invention is mainly used to protect mechanical devices, the control method and circuit connection will not be explained in detail here.

[0049] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the present invention.

Claims

1. A composite tube bundle structure based on an aerogel insulation layer, comprising a tube body (01), an insulation layer (03), an electric heating tape (04), and a sheath layer (06), characterized in that: The pipe body (01) is coated with aerogel by a spraying device to form a first insulation layer (02), and the insulation layer (03) is wrapped around the outside of the first insulation layer (02); The electric heating tape (04) is attached to the outside of the insulation layer (03) and extends along the length of the pipe body (01); The insulation layer (03) is coated with aerogel by a spraying device to form a second heat insulation layer (05), which covers the electric heat tracing tape (04). The sheath layer (06) covers the outside of the second insulation layer (05).

2. The composite tube bundle structure based on an aerogel insulation layer according to claim 1, characterized in that: Aerogels are one or more composites of silica aerogels, ceramic aerogels, or polymer aerogels.

3. An aerogel spraying apparatus, applied in the aerogel spraying process of a composite tube bundle structure based on an aerogel insulation layer as described in any one of claims 1 or 2, comprising an annular seat (1) and a plurality of main nozzles (3), characterized in that: A drive mechanism (2) is provided on the annular seat (1), and a plurality of main nozzles (3) are evenly distributed on one side of the annular seat (1) around the axis of the annular seat (1) through the drive mechanism (2). Each of the main nozzles (3) extends radially along the annular seat (1); The drive mechanism (2) is used to drive each main nozzle (3) to move and adjust radially along the annular seat (1); The annular seat (1) is provided with a paint distribution unit (5), and the uppermost main nozzle (3) is defined as the first nozzle (31). Two auxiliary nozzles (4) are provided on one side of the annular seat (1). The two auxiliary nozzles (4) are symmetrically distributed on both sides of the first nozzle (31) and arranged in an inverted figure-eight shape. The first nozzle (31) and the two auxiliary nozzles (4) are connected to the feeding equipment through the paint distribution unit (5); When each main nozzle (3) moves radially toward the axis of the annular seat (1) to its limit position, the auxiliary nozzle (4) is not connected to the feeding equipment and is used to spray to form the first insulation layer (02). When each main nozzle (3) moves radially along the annular seat (1) toward the side opposite to the axis of the annular seat (1) to the limit position, the first nozzle (31) and the two auxiliary nozzles (4) are connected to the feeding equipment for spraying to form the second insulation layer (05).

4. The aerogel spraying device according to claim 3, characterized in that: The top surface of the electric heat tracing cable (04) is defined as the top surface of the heat tracing cable (041), and the side surface of the electric heat tracing cable (04) is defined as the side surface of the heat tracing cable (042). An angled gap (043) is formed between the two sides of the heat tracing cable (042) and the outer wall of the insulation layer (03); When spraying the second insulation layer (05), the spraying range of the first nozzle (31) covers the top surface (041) of the heating cable, and the spraying range of the auxiliary nozzle (4) covers the side surface (042) of the heating cable. The spraying ranges of the first nozzle (31) and the auxiliary nozzle (4) overlap at the top corner of the electric heating cable (04).

5. An aerogel spraying device according to claim 4, characterized in that: The two main nozzles (3) adjacent to each other on both sides of the first nozzle (31) are defined as the second nozzle (32); When spraying the second insulation layer (05), the spraying range of the second nozzle (32) covers the same-side included angle gap (043), and the spraying range of the second nozzle (32) overlaps with the spraying range of the same-side auxiliary nozzle (4).

6. The aerogel spraying device according to claim 3, characterized in that: The drive mechanism (2) includes a traction disc (21), a drive unit (22), several connecting rods (23) and several sliding seats (24). The annular seat (1) is provided with a plurality of sliding grooves (201) at equal intervals around its axis, and each sliding groove (201) extends radially along the annular seat (1). Each of the slide grooves (201) is equipped with a sliding seat (24) which is limited to sliding installation, and each of the sliding seats (24) is fixed with a connecting rod (23) on its side. The connecting rod (23) is parallel to the axis of the annular seat (1); The traction disc (21) is rotatably mounted on the side of the annular seat (1) and remains coaxial with the annular seat (1); The traction disc (21) is provided with a plurality of arc-shaped guide grooves (211) evenly distributed around its axis. One end of each arc-shaped guide groove (211) is close to the inner edge of the traction disc (21), and the other end is close to the outer edge of the traction disc (21). Each of the connecting rods (23) passes through the arc-shaped guide groove (211) in a corresponding manner, and the connecting rods (23) are movably connected to the inner wall of the arc-shaped guide groove (211); Each of the main nozzles (3) is fixed to the end of the corresponding connecting rod (23); The drive unit (22) is located on one side of the annular seat (1) and is used to drive the traction disc (21) to rotate and adjust.

7. An aerogel spraying apparatus according to claim 6, characterized in that: The drive unit (22) includes a drive motor (221) and a gear (222). A toothed ring (223) is fixed to the side of the traction disc (21), and the toothed ring (223) is coaxial with the traction disc (21); The drive motor (221) is fixed to the side of the ring seat (1) by a mounting base, and the gear (222) is fixed to the output shaft of the drive motor (221); The gear (222) meshes with the gear ring (223).

8. An aerogel spraying device according to claim 3, characterized in that: The paint dispensing unit (5) includes a dispensing seat (51), a guide pipe (52), a supply pipe (54), and a pair of dispensing pipes (53). The distribution seat (51) is fixed to the side of the annular seat (1) by a connecting frame (501), and a vertically extending vertical hole (511) is provided in the distribution seat (51). A metal guide tube (52) is vertically fixed on the first nozzle (31). The top end of the feed tube (52) is inserted into the vertical hole (511) from the bottom of the distribution seat (51) and is slidably connected to the inner wall of the vertical hole (511). The first nozzle (31) is connected to the vertical hole (511) through the feed guide tube (52); Two flow holes (521) are symmetrically provided on the feed tube (52); One end of the feeding pipe (54) is connected to the top of the vertical hole (511), and the other end is connected to the feeding device; One end of the distribution pipe (53) is connected to the corresponding auxiliary nozzle (4), and the other end extends through into the distribution seat (51). The port of the distribution pipe (53) is in a sealed sliding fit with the outer wall of the guide pipe (52).

9. An aerogel spraying device according to claim 8, characterized in that: When the first insulation layer (02) is formed by spraying, the flow hole (521) is located below the port of the distribution pipe (53) inside the distribution seat (51), and the flow hole (521) is blocked by the inner wall of the vertical hole (511), and the port of the distribution pipe (53) inside the distribution seat (51) is blocked by the outer wall of the guide pipe (52). When the second insulation layer (05) is formed by spraying, the flow hole (521) and the port of the distribution pipe (53) located in the distribution seat (51) are aligned and connected respectively.

10. An aerogel spraying apparatus according to claim 8, characterized in that: An electric valve (541) is installed on the feed pipe (54).

Images