A high-temperature multilayer thermal insulation device for a solenoid valve and a manufacturing method thereof

Abstract

The application discloses a high-temperature multilayer heat insulation device for an electromagnetic valve and a manufacturing method. The device comprises a multilayer heat insulation core and an edge sealing structure. The multilayer heat insulation core is formed by alternately stacking a plurality of heat reflection layers and a plurality of interval layers along the thickness direction, and the heat reflection layer is used as the outermost layer on both sides. A metal foil edge sealing member is continuously arranged along the periphery of the core and covers the exposed edges of each layer. During manufacturing, the heat reflection layer material and the interval layer material are pre-cut and alternately stacked to form a core blank. The cutting contour is determined according to the shape of the heat insulation area of the electromagnetic valve, and the multilayer heat insulation core is cut to form. The edge sealing is completed by continuously winding the metal foil edge sealing member. After the edge sealing, stainless steel wire clamping and reflection screen shell assembly can also be performed. The application can improve the special-shaped fitting capability, edge sealing property, anti-vibration stability and high-temperature washing protection capability of the heat insulation core.

Description

Technical Field

[0001] This invention relates to the field of high-temperature thermal insulation and protection, and in particular to a high-temperature multilayer thermal insulation device for solenoid valves and its manufacturing method. Background Technology

[0002] In the fields of aerospace, shipbuilding, and high-end power equipment, solenoid valves in power units are typically used as actuators in control systems to control the on / off, reversal, or flow of the working medium. Due to the overall layout and operating conditions of the power unit, solenoid valves may be exposed to high-temperature, high-frequency vibration, and airflow scouring environments for extended periods. The internal components of the solenoid valve, such as the electromagnetic coil, sealing gaskets, and iron core, have relatively limited high-temperature resistance. After prolonged exposure to high-temperature radiation and heat conduction, problems such as aging and cracking of the coil insulation layer, seal failure, and valve body jamming can easily occur, thus affecting the reliability of the solenoid valve's operation and the operational safety of the power unit.

[0003] Existing technologies typically employ multi-layered insulation structures for thermal protection of high-temperature components. These structures generally consist of alternating layers of reflective metal materials and low-thermal-conductivity spacer materials. The metal layers reflect heat radiation, while the spacer materials reduce direct heat conduction between adjacent metal layers. However, the space surrounding solenoid valves in power units is usually confined and irregularly shaped, making it difficult for existing general-purpose insulation structures to simultaneously meet the requirements of irregular fit, vibration-resistant fixation, edge sealing, and lightweight design.

[0004] For example, patent CN112177798A, "Heat Insulation Structure Applicable to Spacecraft Engines," discloses an engine heat insulation structure including an engine bracket, heat insulation pad assembly, adapter plate, and multi-layer heat insulation components. This structure improves the engine's heat insulation capability under hot back-immersion conditions through the heat insulation pad assembly and the multi-layer heat insulation components mounted on the manifold. This solution mainly targets hot back-immersion isolation between the engine injector and the manifold, without addressing the conformal stacking, continuous edge encapsulation, and vibration-resistant clamping design for the narrow, irregularly shaped mounting area of ​​the solenoid valve. Patent CN110001160A, "A High-Temperature Resistant Multi-Layer Composite Heat Insulation Component and Its Preparation Method," discloses a heat insulation component formed by stacking a reflective layer and a thermal resistance layer. The reflective layer uses a metal foil coated with a high-reflectivity material, and the thermal resistance layer uses a heat insulation material with a low thermal conductivity. This solution mainly targets multi-layer heat insulation for the hot-end parts of aerospace applications, lacking specific design for local material configuration, continuous edge encapsulation, and vibration-resistant fixing in the irregularly shaped area of ​​the solenoid valve.

[0005] Therefore, existing multi-layer thermal insulation devices still have problems such as insufficient compatibility with irregularly shaped installation areas of solenoid valves in power units, weak vibration resistance, easy loosening of edges, easy separation between layers, insufficient sealing protection, and high assembly costs. Summary of the Invention

[0006] The purpose of this invention is to provide a high-temperature multilayer thermal insulation device and manufacturing method for solenoid valves, so as to solve the problems that existing thermal insulation structures are difficult to adapt to the narrow and irregular installation space of solenoid valves, are prone to interlayer loosening or fiber shedding under high-frequency vibration conditions, have insufficient sealing at the edge of the thermal insulation core, and have low overall protection and assembly reliability.

[0007] To achieve the above objectives, the present invention provides the following technical solution: The present invention provides a high-temperature multilayer heat insulation device for a solenoid valve, comprising a multilayer heat insulation core and an edge sealing structure. The multilayer heat insulation core includes multiple heat-reflective layers and multiple spacer layers alternately stacked along the thickness direction, with a spacer layer disposed between two adjacent heat-reflective layers. Both sides of the multilayer heat insulation core along the thickness direction have heat-reflective layers as their outermost layers. The edge sealing structure includes a metal foil edge sealing member, which is continuously disposed along the periphery of the multilayer heat insulation core, spanning the edge of the multilayer heat insulation core and extending to cover the surface areas near the periphery on both sides of the multilayer heat insulation core along the thickness direction, so as to continuously cover the exposed edges of each heat-reflective layer and each spacer layer.

[0008] In one embodiment, the high-temperature multilayer thermal insulation device for the solenoid valve further includes a plurality of clamping members, which are spaced apart circumferentially along the multilayer thermal insulation core. Each clamping member has a first end and a second end, the first end passing through the metal foil sealing member and the multilayer thermal insulation core, and connected to the second end, so that the clamping member forms a clamping constraint on the multilayer thermal insulation core and the metal foil sealing member located on its surface.

[0009] In one embodiment, the metal foil sealing element includes a nickel foil strip with a width of 1.5 mm to 2.5 mm. The nickel foil strip is continuously wound around the periphery of the multi-layer heat insulation core, and the overlap width between adjacent wound sections is 40% to 60% of the width of the nickel foil strip. The clamping element includes a stainless steel wire, one end of which passes through the nickel foil strip and the multi-layer heat insulation core and is connected to the other end. The diameter of the stainless steel wire is 0.15 mm to 0.25 mm.

[0010] In one embodiment, the heat-reflective layer comprises at least one of stainless steel foil and nickel foil, and the spacer layer comprises high-silica fiberglass cloth. The thickness of the stainless steel foil is 0.04 mm to 0.06 mm, the thickness of the nickel foil is 0.012 mm to 0.020 mm, and the thickness of the high-silica fiberglass cloth is 0.06 mm to 0.10 mm. The multilayer heat-insulating core includes material configuration areas corresponding to each heat-insulating area of ​​the solenoid valve. Each material configuration area adopts any one of a high-temperature straight-face structure, a universal bonding structure, and a high-strength support structure. In the high-temperature straight-face structure, the outermost heat-reflective layer on the side facing the heat source is stainless steel foil, and each heat-reflective layer inside the outermost heat-reflective layer is nickel foil; in the universal bonding structure, each heat-reflective layer is nickel foil; and in the high-strength support structure, each heat-reflective layer is stainless steel foil.

[0011] In one embodiment, the high-temperature multilayer thermal insulation device for the solenoid valve further includes a reflector housing, which comprises multiple housing segments and two annular sealing rings. The multiple housing segments are welded together to form a hollow housing, and the multilayer thermal insulation core is nested within the hollow housing. The two annular sealing rings are respectively welded to both ends of the hollow housing to form an end sealing structure. Each housing segment comprises a stainless steel plate with a thickness of 0.15 mm to 0.25 mm.

[0012] This invention also provides a method for manufacturing a high-temperature multilayer heat insulation device for a solenoid valve, comprising: determining the core type corresponding to each heat-insulating region based on the high-temperature erosion conditions, curved surface fitting conditions, and support strength requirements of different heat-insulating regions of the solenoid valve; pre-cutting the heat-reflective layer material and the spacer layer material according to the design dimensions of the multilayer heat insulation core; and alternately stacking the pre-cut heat-reflective layer material and the spacer layer material along the thickness direction according to the core type corresponding to each heat-insulating region to form a heat insulation core blank, wherein a spacer layer material is disposed between two adjacent heat-reflective layer materials. The heat-reflective layer material is used as the outermost layer on both sides of the heat-insulating core blank along the thickness direction. According to the shape of the area to be insulated of the solenoid valve, the cutting outline is determined on the heat-insulating core blank. The heat-insulating core blank is cut along the cutting outline to obtain a multi-layer heat-insulating core including multiple heat-reflective layers and multiple spacer layers. The metal foil sealing piece is continuously wound along the periphery of the multi-layer heat-insulating core, so that the metal foil sealing piece crosses the edge of the multi-layer heat-insulating core and extends to both sides of the thickness direction of the multi-layer heat-insulating core, so as to continuously cover the exposed edges of each heat-reflective layer and each spacer layer, thereby obtaining a high-temperature multi-layer heat-insulating device for the solenoid valve.

[0013] In one embodiment, the heat-reflective layer material includes at least one of stainless steel foil and nickel foil, and the spacer layer material includes high-silica glass fiber cloth. Before pre-cutting the heat-reflective layer material and the spacer layer material, at least two stainless steel foils are roll-welded together when the size of a single stainless steel foil is smaller than the pre-cut size determined according to the design dimensions of the multilayer insulation core.

[0014] In one embodiment, the core type includes at least one of high-temperature flat type, universal bonding type, and high-strength support type. For the high-temperature flat type heat-insulating area, stainless steel foil is selected as the outermost heat-reflective layer material corresponding to the heat-insulating area and located on the heat source side, and nickel foil is selected as the remaining heat-reflective layer materials corresponding to the heat-insulating area; for the universal bonding type heat-insulating area, nickel foil is selected as each heat-reflective layer material corresponding to the heat-insulating area; for the high-strength support type heat-insulating area, stainless steel foil is selected as each heat-reflective layer material corresponding to the heat-insulating area; according to the core type corresponding to each heat-insulating area, the heat-reflective layer material and the spacer layer material are alternately stacked along the thickness direction to form a material configuration area corresponding to the working conditions of each heat-insulating area.

[0015] In one embodiment, when determining the cutting contour on the insulation core blank, a shaped template corresponding to the shape of the area to be insulated of the solenoid valve is attached to the insulation core blank; a contour line is drawn on the insulation core blank along the shaped template, and the contour line is used as the cutting contour; the insulation core blank is cut along the contour line to obtain a multi-layer insulation core. Nickel foil strips are continuously wound around the periphery of the multi-layer insulation core, so that adjacent winding sections overlap each other; after the nickel foil strips are continuously wound, multiple clamping positions are set at intervals along the circumference of the multi-layer insulation core, and a section of stainless steel wire is set at each clamping position. One end of each section of stainless steel wire is passed through the nickel foil strip and the multi-layer insulation core, and the passed end is connected to the other end to clamp the multi-layer insulation core and the nickel foil strip.

[0016] In one embodiment, after the metal foil edge-sealing component is continuously wound around the periphery of the multi-layer heat-insulating core, the reflector shell is prepared and the core is assembled. The reflector shell preparation includes: cutting a stainless steel plate into rectangular plates; stretching the rectangular plates to obtain multiple shell segments; welding the multiple shell segments together to form a hollow shell; welding two annular sealing rings to both ends of the hollow shell; and polishing the hollow shell with the annular sealing rings to obtain the reflector shell. The core assembly includes: nesting the edge-sealed multi-layer heat-insulating core into the reflector shell; adjusting the assembly gap between the multi-layer heat-insulating core and the reflector shell to ensure the multi-layer heat-insulating core remains stable within the reflector shell without significant shaking, thus obtaining the finished high-temperature multi-layer heat-insulating device for a solenoid valve.

[0017] Compared with the prior art, the present invention combines the radiation reflection effect of metal materials with the conduction barrier effect of fiber materials by alternately stacking heat reflective layers and spacer layers, forming a composite heat insulation path in a smaller installation space, which helps to reduce the heat transferred from the high temperature area of ​​the power unit to the solenoid valve.

[0018] This invention can configure a high-temperature straight-face structure, a universal fitting structure, or a high-strength support structure according to the high-temperature scouring conditions, curved surface fitting conditions, and support strength requirements of different heat-insulating areas of the solenoid valve, so that different positions of the same device can obtain heat resistance, flexibility, and support strength that match the local working conditions.

[0019] The metal foil sealing element extends across the edge of the multi-layer insulation core and continuously covers the surface areas near the periphery on both sides of the core, so that the exposed edges of the stacked layers form a continuous constraint, which helps to reduce the risk of loose edges, interlayer misalignment, and high-temperature airflow entering the interlayer space from the edges.

[0020] In the embodiment of setting the reflector shell, the reflector shell and its end annular sealing ring can form external mechanical protection and end sealing for the multi-layer heat insulation core; through the preparation of the reflector shell and the assembly of the core, the multi-layer heat insulation core can be kept stable inside the reflector shell, which is conducive to improving the assembly reliability of the finished product. Attached Figure Description

[0021] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. Wherein: Figure 1 This is a schematic diagram of the layered structure of a multilayer thermal insulation core in one embodiment of the present invention.

[0022] Figure 2 This is a schematic diagram of the layered structure of another multilayer thermal insulation core in one embodiment of the present invention.

[0023] Figure 3 This is a partial schematic diagram of the edge sealing and hooping structure of the multi-layer heat insulation core in one embodiment of the present invention.

[0024] Figure 4 This is a schematic diagram of the structure of a reflective screen housing according to an embodiment of the present invention.

[0025] Reference numerals: 1. Stainless steel foil; 2. High silica fiberglass cloth; 3. Nickel foil; 4. Multi-layer thermal insulation core; 5. Hollow shell; 6. Annular sealing ring; 7. Nickel foil strip; 8. Stainless steel wire. Detailed Implementation

[0026] The present invention will now be described in detail with reference to the accompanying drawings and embodiments. Various examples are provided by way of explanation and not by way of limitation. Indeed, those skilled in the art will recognize that modifications and variations can be made to the invention without departing from its scope or spirit. For example, a feature shown or described as part of one embodiment may be used in another embodiment to produce yet another embodiment. Therefore, it is desirable that the invention encompass such modifications and variations falling within the scope of the appended claims and their equivalents.

[0027] The solenoid valve for power units referred to in this invention is a valve-type actuator installed in aerospace power units, marine power units, or other high-end power equipment, which controls the on / off, reversal, or flow of the working medium through electromagnetic drive. Such solenoid valves may be surrounded by conditions such as high-temperature radiation, high-temperature airflow scouring, high-frequency mechanical vibration, and confined, irregularly shaped installation spaces. The areas requiring heat insulation may include areas directly facing high-temperature heat sources or high-temperature airflows, areas in contact with the curved surfaces of the valve body, and areas such as valve body corners, connection points, or areas providing assembly support.

[0028] The term "roll welding" in this invention refers to a connection process in which pressure and welding current are continuously applied along the overlapping area of ​​adjacent metal foils using roller electrodes, resulting in continuous or densely intermittent weld points between the adjacent metal foils. The term "stretch forming" refers to applying forming force to a sheet metal using a forming die, causing the planar sheet metal to form a shell part with a predetermined curvature. The aforementioned roll welding, cutting, stretching, welding, and polishing can all be performed using conventional processing equipment in the art, and specific equipment models do not constitute a limitation on this invention.

[0029] like Figures 1 to 4 As shown, the high-temperature multilayer heat insulation device for a solenoid valve provided in this embodiment includes a multilayer heat insulation core 4 and a sealing structure. The multilayer heat insulation core 4 includes multiple heat-reflective layers and multiple spacer layers alternately stacked along the thickness direction, with a spacer layer disposed between two adjacent heat-reflective layers. Both sides of the multilayer heat insulation core 4 have heat-reflective layers as the outermost layers along the thickness direction, thereby forming metal reflective surfaces on both outer surfaces and covering and constraining the spacer layers located inside.

[0030] Furthermore, the heat-reflective layers in the multi-layered insulation core 4 are spaced apart from each other in the thickness direction. Spacers separate adjacent heat-reflective layers, allowing heat to pass sequentially from the heat source side to the coolant side, passing through the radiation reflection interface of the heat-reflective layers and the low thermal conductivity region of the spacers. Because the heat-reflective layers and spacers are alternately arranged, a multi-level composite insulation structure can be formed with a relatively thin overall thickness.

[0031] The heat-reflective layer comprises at least one of stainless steel foil 1 and nickel foil 3, and the spacer layer comprises high-silica glass fiber cloth 2. Within an feasible size range, the thickness of stainless steel foil 1 is 0.04 mm to 0.06 mm, the thickness of nickel foil 3 is 0.012 mm to 0.020 mm, and the thickness of high-silica glass fiber cloth 2 is 0.06 mm to 0.10 mm. Preferably, the stainless steel foil 1 is a 0.05 mm thick 1Cr18Ni9Ti stainless steel foil, the nickel foil 3 is a 0.016 mm thick nickel foil, and the high-silica glass fiber cloth 2 is a 0.08 mm thick BWT100-B2 type high-silica glass fiber cloth.

[0032] Among them, stainless steel foil 1 can be used on surfaces that need to be directly subjected to high-temperature heat flow or airflow, and can provide a certain shape retention capability at the corners or stress points of the core; nickel foil 3 can be used in positions that require high flexibility and conformal bonding capability. High silica fiber cloth 2 is placed between two adjacent layers of metal foil, maintaining a gap between the metal foils, and can bend together with the metal foils, so that the multi-layer heat insulation core 4 can adapt to the irregular shape of the solenoid valve.

[0033] Depending on the operating conditions of different heat-insulating areas of the solenoid valve, the multi-layer heat-insulating core 4 includes material configuration areas corresponding to each heat-insulating area. Each material configuration area adopts any one of the following: high-temperature straight-face structure, general-purpose bonding structure, and high-strength support structure. The main difference between the three structures lies in the type of metal foil used in the heat reflective layer and the erosion resistance, flexible bonding, or support functions required at the corresponding positions.

[0034] For a high-temperature direct-face structure, the outermost heat-reflective layer facing the heat source is a stainless steel foil 1, and the heat-reflective layers inside this outermost layer are nickel foils 3. High-silica fiberglass cloth 2 is placed between adjacent heat-reflective layers. The stainless steel foil 1 on the heat source side first withstands radiation and airflow from the high-temperature heat source. The multiple layers of nickel foil 3 inside and the high-silica fiberglass cloth 2 further form a multi-level radiation reflection and conduction blocking structure. Therefore, this structure is suitable for areas directly facing high-temperature erosion.

[0035] For the universal bonding structure, each heat-reflective layer is a nickel foil 3, and a high-silica glass fiber cloth 2 is placed between each adjacent nickel foil 3. Since the nickel foil 3 is relatively thin and easy to bend, the universal bonding structure has good flexibility while maintaining a multi-layer reflective interface. It can bend with the curved surface or transition surface of the solenoid valve, and is suitable for installation on the curved surface of the valve body and in areas with small installation gaps.

[0036] For high-strength support structures, each heat-reflective layer is a stainless steel foil 1, and a high-silica glass fiber cloth 2 is placed between each adjacent stainless steel foil 1. The multi-layer stainless steel foil 1 can improve the overall rigidity and shape retention of the corresponding position, so this structure can be arranged at the corners of the valve body, the assembly support position, or the position that is easily subjected to local clamping force.

[0037] Within the same multi-layered insulation core 4, different layered structures can be combined according to different regions of the solenoid valve. For example, a high-temperature straight-face structure can be set on the side closest to the high-temperature airflow, a universal fitting structure can be set on the area extending around the curved surface of the valve body, and a high-strength support structure can be set at the corners or assembly stress points. Different types of regions can be continuously stacked, partially replaced with materials, or stably overlapped to form a whole, and after subsequent unified shaping, cutting, and sealing, they remain as a single multi-layered insulation core 4.

[0038] In one embodiment, a thermal insulation unit consists of a heat-reflective layer and an adjacent spacer layer. A multi-layer thermal insulation core 4 can have N thermal insulation units stacked according to thermal insulation requirements, with an additional heat-reflective layer on the top, thus including N spacer layers and N+1 heat-reflective layers. For example, a preferred structure is a five-unit core, which is formed by alternating stacking of six heat-reflective layers and five spacer layers.

[0039] In one implementation, the number of insulation units can be determined during the actual design based on the allowable installation thickness around the solenoid valve, the high-temperature heat flux intensity, the target insulation effect, and the required flexibility of the core. Increasing the number of insulation units can increase the number of heat-reflecting interfaces and spacer layers, but it will also increase the total thickness of the core; therefore, it can be determined in conjunction with the specific installation space.

[0040] The edge sealing structure includes a metal foil edge seal. The metal foil edge seal is continuously disposed along the periphery of the multilayer heat insulation core 4 and extends across the edge of the multilayer heat insulation core 4, covering the surface areas near the periphery on both sides of the core thickness direction, thereby continuously covering the exposed edges of each heat reflective layer and each spacer layer. In one embodiment, the metal foil edge seal includes a nickel foil strip 7, which has good flexibility and can be continuously bent according to the shape of the multilayer heat insulation core 4, thereby forming a continuous covering of the laminated edges.

[0041] The width of the nickel foil strip 7 can be 1.5 mm to 2.5 mm, preferably 2 mm. The nickel foil strip 7 is continuously wound around the periphery of the multilayer heat insulation core 4, and the overlap width of adjacent winding sections can be 40% to 60% of the width of the nickel foil strip 7, preferably 50% of the width of the nickel foil strip 7. After adjacent winding sections overlap, it can avoid the formation of through-holes on the sealing path and can continuously constrain the edges of each heat reflective layer and each spacer layer.

[0042] The high-temperature multilayer thermal insulation device for the solenoid valve also includes multiple clamping members. These clamping members are spaced apart circumferentially along the multilayer thermal insulation core 4. Each clamping member has a first end and a second end. The first end passes through the metal foil sealing member on the surface of the multilayer thermal insulation core 4 and the multilayer thermal insulation core 4, and connects to the second end to form a clamping constraint on the multilayer thermal insulation core 4 and the metal foil sealing member. In this embodiment, the clamping member includes a stainless steel wire 8, the diameter of which can be 0.15mm to 0.25mm, preferably 0.2mm.

[0043] Each stainless steel wire 8 is independent of the others, and multiple clamping positions can be arranged circumferentially at intervals according to the circumferential length, local curvature, and stacking stability requirements. For each stainless steel wire 8, after its first end is passed through the nickel foil strip 7 located on the surface of the multilayer heat insulation core 4 and the multilayer heat insulation core 4, the first end and the second end are connected and tightened at the corresponding clamping position, thereby forming a local clamping constraint.

[0044] In embodiments requiring external protection, the high-temperature multilayer thermal insulation device for the solenoid valve further includes a reflector housing. The reflector housing comprises multiple housing segments and two annular sealing rings 6. The multiple housing segments are welded together to form a hollow housing 5, and the multilayer thermal insulation core 4 is nested inside the hollow housing 5; the two annular sealing rings 6 are respectively welded to both ends of the hollow housing 5 to form an end sealing structure.

[0045] The shell segment includes a stainless steel plate, the thickness of which can be 0.15mm to 0.25mm, preferably 0.2mm, and the material is preferably 1Cr18Ni9Ti stainless steel. The reflective screen shell is located outside the multi-layer heat insulation core 4, which can provide mechanical protection for the multi-layer heat insulation core 4 and ensure that the external high-temperature airflow acts on the reflective screen shell first rather than directly scouring the multi-layer heat insulation core 4.

[0046] Two annular sealing rings 6 are respectively disposed at both ends of the hollow shell 5 and welded to the hollow shell 5. The annular sealing rings 6 are used to reduce the open gap at the ends of the hollow shell 5, so that the ends form a relatively continuous sealing boundary, and together with the edge sealing of the multi-layer heat insulation core 4, they form a multi-level protection.

[0047] In the assembled state, the shape of the multi-layer heat insulation core 4 matches the internal contour of the reflector shell, and the multi-layer heat insulation core 4 is nested inside the reflector shell. An assembly gap is maintained between the two to meet the requirements of insertion and fixation, so that the multi-layer heat insulation core 4 will not lose its separating function due to excessive compression during the assembly process, and at the same time, it can limit the core from significant shaking under vibration conditions after assembly.

[0048] The aforementioned multi-layered insulating core 4, edge sealing structure, clamping components, and reflector shell together constitute a high-temperature insulation structure suitable for solenoid valves in power units. The multi-layered insulating core 4 primarily serves to reflect radiation and block conduction; the edge sealing structure covers and constrains the edges of the layers; the clamping components enhance the vibration resistance after edge sealing; and the reflector shell provides external mechanical protection and end sealing. The multi-layered insulating core 4 and edge sealing structure constitute the basic insulation and edge constraint structure; the clamping components and reflector shell can be further configured according to vibration reinforcement and external protection requirements.

[0049] This invention also provides a method for manufacturing the above-mentioned high-temperature multilayer heat insulation device for solenoid valves, comprising the following steps: S101, based on the high-temperature scouring conditions, curved surface fitting conditions, and support strength requirements of different heat-insulating areas of the solenoid valve, determine the corresponding core type for each heat-insulating area.

[0050] S102, according to the design dimensions of the multi-layer heat insulation core, the heat reflective layer material and the spacer layer material are pre-cut.

[0051] S103, according to the core type corresponding to each heat-insulating area, the pre-cut heat-reflective layer material and spacer layer material are alternately stacked along the thickness direction to form a heat-insulating core blank; a spacer layer material is set between two adjacent heat-reflective layer materials, and the heat-reflective layer material is used as the outermost layer on both sides of the heat-insulating core blank along the thickness direction.

[0052] S104. Based on the shape of the area to be insulated by the solenoid valve, determine the cutting outline on the insulation core blank.

[0053] S105, the heat insulation core blank is cut along the cutting contour to obtain a multi-layer heat insulation core including multiple heat reflective layers and multiple spacer layers.

[0054] S106, the metal foil sealing element is continuously wound around the periphery of the multi-layer heat insulation core, so that the metal foil sealing element covers the exposed edges of each heat reflection layer and each spacer layer, thus obtaining a high-temperature multi-layer heat insulation device for solenoid valves with completed sealing.

[0055] In step S101, the area to be insulated can be established based on the actual structure of the solenoid valve. The determination of the area to be insulated can take into account the location of the heat source, the direction of the high-temperature airflow, the shape of the valve body surface, the installation connection structure, and the surrounding usable space. For the same solenoid valve, different locations can be respectively determined as the high-temperature scouring area, the curved surface fitting area, and the assembly support area, and the corresponding core type can be determined accordingly.

[0056] In step S101, based on the high-temperature scouring conditions, curved surface bonding conditions, and support strength requirements of different heat-insulating areas of the solenoid valve, the core type corresponding to each heat-insulating area is determined. The core type includes at least one of high-temperature flat surface type, universal bonding type, and high-strength support type. After determining the core type, the heat-reflective layer material required for each core type is laid up, so that the stacked heat-insulating core blank forms a material configuration area corresponding to the working conditions of each heat-insulating area.

[0057] For the heat-reflecting area with a high-temperature, straight-surface core, stainless steel foil 1 is selected as the outermost heat-reflecting layer material corresponding to the heat-reflecting area and located on the heat source side, and nickel foil 3 is selected as the remaining heat-reflecting layer materials corresponding to the heat-reflecting area. In this structure, the stainless steel foil 1 on the heat source side is used to improve the high-temperature erosion resistance of the directly heated surface, while the nickel foils 3 on its inner side form the subsequent radiation reflection interface and maintain a certain degree of flexibility in the core.

[0058] For the heat-reflective layer area to be insulated with a universal bonding core type, nickel foil 3 is selected as the material for each heat-reflective layer corresponding to the heat-reflective layer area, and high-silica glass fiber cloth 2 is placed between adjacent nickel foils 3. This material combination maintains the multi-layer heat insulation function while being easy to bend, making it suitable for bonding with the curved surface of the solenoid valve.

[0059] For heat-reflective layers in areas requiring insulation, with a high-strength support core, stainless steel foil 1 is selected as the corresponding heat-reflective layer material, and high-silica fiberglass cloth 2 is placed between adjacent stainless steel foils 1. This material combination improves the shape retention capability of the corresponding area and is suitable for valve body corners, assembly supports, or locations that may be subject to localized clamping forces.

[0060] In step S102, the design dimensions of the multi-layer insulation core 4 are determined based on the boundary of the area to be insulated and the installation space. The design dimensions include at least the outer contour dimensions of the core in its unfolded state, and may also include the dimensions of the central hole or clearance hole, the dimensions of local notches, the clearance positions corresponding to the installation connection structure, and the boundary positions of different material configuration areas. For parts that require bending and fitting, the contour compensation required after bending can be considered during the unfolding design, so that the finally cut multi-layer insulation core 4 can fit the surface of the solenoid valve without producing obvious wrinkles.

[0061] Prepare the heat-reflective layer material and spacer layer material according to the above design dimensions. The heat-reflective layer material includes at least one of stainless steel foil 1 and nickel foil 3, and the spacer layer material includes high-silica glass fiber cloth 2. The stainless steel foil 1 is a 0.05 mm thick 1Cr18Ni9Ti stainless steel foil, the nickel foil 3 is 0.016 mm thick, and the high-silica glass fiber cloth 2 is a 0.08 mm thick BWT100-B2 type high-silica glass fiber cloth. The stainless steel plate used for the subsequent reflective screen housing is preferably a 0.2 mm thick 1Cr18Ni9Ti stainless steel plate.

[0062] Before the materials enter the cutting process, a visual inspection can be performed on the metal foil and the high-silica fiberglass cloth 2. The metal foil should be kept as flat as possible, avoiding obvious wrinkles, cracks, and local warping that could affect the heat reflective surface; the high-silica fiberglass cloth 2 should maintain an intact fiber weave structure, avoiding obvious holes, breaks, or large areas of loose edges that could affect subsequent lamination. Pre-inspection can reduce the amount of defective materials entering the subsequent lamination process.

[0063] Before pre-cutting the heat-reflective layer material and the spacer layer material, if the size of a single stainless steel foil 1 is smaller than the pre-cut size determined according to the design size of the multi-layer heat insulation core 4, at least two stainless steel foils 1 are spliced ​​by roll welding. During splicing, the edges of adjacent stainless steel foils 1 are made to form an overlapping area, and then the roller electrode is continuously moved along the overlapping area to make the two stainless steel foils 1 form a stable connection under the action of pressure and welding current.

[0064] The width of the roll weld should be controlled between 8mm and 10mm. This width is used to reduce the impact of the splicing area on the reflective surface while ensuring a stable connection. After the roll weld is completed, the splicing area can be flattened and visually inspected to ensure that the surface of the spliced ​​reflective foil is free of obvious wrinkles and loosening, and that the weld joint is continuous.

[0065] Subsequently, stainless steel foil 1, nickel foil 3, and high-silica fiberglass cloth 2 were pre-cut. The purpose of pre-cutting is to obtain initial dimensions for each layer of material that facilitate subsequent stacking and uniform shaping and cutting. The pre-cut contour can retain an appropriate processing allowance compared to the final finished contour, so that different materials can be uniformly cut using the same shaping template after being stacked to form the insulation core blank, thereby improving the consistency of the edges of each layer.

[0066] During the pre-cutting process, the stainless steel foil 1, nickel foil 3, and high-silica glass fiber cloth 2 required for different core types can be classified and placed separately, and labeled according to the stacking order to avoid material sequence errors during subsequent stacking. For areas with different material configurations within the same core, the corresponding areas can be marked according to the design drawings or process cards, so that materials can be selected according to the regional conditions during subsequent layup.

[0067] In step S103, the heat-reflective layer material, which serves as the bottom layer, can be laid flat on the clean workbench. Then, a layer of high-silica fiberglass cloth 2 is evenly laid on the surface of the heat-reflective layer material. Subsequently, the next layer of heat-reflective layer material is laid on the high-silica fiberglass cloth 2, and the layers are stacked cyclically in the order of "heat-reflective layer material - spacer layer material - heat-reflective layer material" until the designed number of unit layers is reached.

[0068] When different regions of the multi-layer thermal insulation core 4 correspond to different core types, the corresponding heat-reflective layer materials can be configured according to the pre-divided regions during the layup process. The boundaries of different material regions should maintain positional correspondence, and adjacent regions should still form an integral blank after being stacked. Subsequent uniform cutting and continuous edge sealing can further limit the relative displacement of different regions at the boundary positions.

[0069] After laying the designed number of spacer layers, a heat-reflective layer is laid on top, so that both sides of the insulation core blank along the thickness direction are covered with heat-reflective layer material as the outermost layer. Thus, there is at least one spacer layer between each two adjacent heat-reflective layer materials, and the spacer layer material does not directly serve as the outer surface of the core.

[0070] During the layup process, each layer of material should be kept as flat as possible to avoid obvious wrinkles, folds, and misalignments. For the high-silica fiberglass cloth 2, it should be spread evenly between adjacent heat-reflective layers; for metal foil, local folding should be avoided to prevent large-area direct contact between adjacent metal foils. If necessary, each layer can be lightly pressed and leveled without damaging the material to maintain a relatively uniform thickness of the insulation core blank.

[0071] In one embodiment, a heat insulation unit consists of a heat-reflective layer material and a layer of high-silica fiberglass cloth 2. When five heat insulation units are formed, the heat insulation core blank includes six layers of heat-reflective layer material and five layers of high-silica fiberglass cloth 2. The total thickness of the five-unit heat insulation core blank is determined according to the selection of each heat-reflective layer material and the actual thickness of each layer. In actual implementation, N heat insulation units can be stacked according to the heat insulation requirements.

[0072] After lamination, a preliminary inspection is conducted on the insulation core blank to confirm that the top and bottom layers are both heat-reflective materials, that each spacer layer is located between adjacent heat-reflective materials, and to check for any obvious interlayer gaps, misalignments, or local bulges. After confirmation, the blank proceeds to the shaping and cutting process.

[0073] In step S104, a shaped template corresponding to the shape of the area to be insulated of the solenoid valve is attached to the surface of the insulation core blank. The shaped template can be made according to the actual shape of the solenoid valve, design drawings, or a three-dimensional model, and the connection parts, holes, local notches, and installation direction information that need to be avoided are reflected in the outline of the template.

[0074] In this embodiment, after the shaping template is attached to the heat insulation core blank, the template is temporarily positioned to prevent it from moving relative to the blank during the drawing process. Subsequently, continuous contour lines are drawn on the surface of the heat insulation core blank along the outer contour of the shaping template, and these contour lines are used as the subsequent cutting contours.

[0075] When the area to be insulated includes a central hole, clearance hole, groove, or local recess, the corresponding internal cutting lines can be drawn simultaneously with the outer contour lines. By using the same template to uniformly position the outer contour and local clearance structures, the cut multi-layer insulation core 4 can be aligned with the solenoid valve mounting structure.

[0076] After drawing the outline, the closure, corner positions, and relative positions with the material partitions of the outline can be checked. Only after confirming that the outline has not deviated from the predetermined design position can the cutting process be carried out to avoid multiple layers being scrapped at the same time due to template offset.

[0077] In step S105, the thermal insulation core blank in its stacked state is cut as a whole along the contour line determined in step S104, so that different heat reflective layer materials and spacer layer materials form corresponding edge contours under the same cutting reference. Overall cutting can reduce the cumulative error caused by re-aligning each layer after cutting them separately.

[0078] During the cutting process, the insulation core blank can be appropriately pressed or limited near the cutting area to reduce the relative slippage of the materials in each layer under the cutting force. When cutting metal foil, excessive burrs should be avoided. When cutting high-silica glass fiber cloth 2, edge fraying and tearing should be minimized to provide a neater edge for subsequent sealing.

[0079] After cutting along the outer contour line and the required internal cutting line, a multi-layer heat-insulating core 4 matching the solenoid valve mounting structure is obtained. In this embodiment, the core obtained at this stage can be referred to as a heat-insulating core semi-finished product. The heat-insulating core semi-finished product still maintains the relationship of alternating stacking of the heat-reflective layer and the spacer layer along the thickness direction.

[0080] The semi-finished insulation core is inspected for its shape to confirm that its outer contour, center hole, or avoidance structure corresponds to the shaping template, and the edges of each layer are checked for obvious misalignment. For small local burrs or loose fibers, they can be trimmed without changing the overall cutting contour and layering sequence.

[0081] The multi-layer thermal insulation core 4, after being cut, can form a corresponding annular, arc-shaped or other conformal structure according to the irregular contour of the solenoid valve, so that the multi-layer thermal insulation structure can be arranged in a small installation space and provide a uniform edge for subsequent continuous perimeter sealing.

[0082] In step S106, nickel foil strips 7 are continuously wound around the periphery of the multilayer heat insulation core 4 as metal foil sealing elements. During winding, the nickel foil strips 7 cross the edge of the multilayer heat insulation core 4 and extend to both sides of the core thickness direction, covering the surface area near the periphery, so that the exposed edges of each heat reflective layer and each spacer layer are continuously covered by the nickel foil strips 7.

[0083] Within an feasible range, the width of the nickel foil strip 7 is 1.5 mm to 2.5 mm; preferably 2 mm. Adjacent winding sections overlap each other, and the overlap width can be 40% to 60% of the width of the nickel foil strip 7, preferably 50% of the width of the nickel foil strip 7. Through continuous winding and overlapping, a continuous coverage is formed around the entire periphery of the core.

[0084] When winding the nickel foil strip 7, you can start from a position where the outline of the multi-layer heat insulation core 4 is relatively flat, and advance segment by segment in the same direction. For corners or arc-shaped positions with large curvature changes, you can reduce the advancing distance between adjacent winding segments, so that the nickel foil strip 7 gradually bends along the edge of the core, and does not form obvious curling at the corner position.

[0085] During the winding process, the tension of the nickel foil strip 7 is controlled so that it can adhere to the edges of each layer, but without cutting into the high-silica fiberglass cloth 2 due to excessive tension or causing excessive compression of the local spacer layer. After the nickel foil strip 7 covers the edges of the layers, it can limit the heat reflective layer and spacer layer from spreading outward from the edges and reduce the channels through which high-temperature airflow directly enters the interlayer.

[0086] After the nickel foil strip 7 is continuously wound around the periphery of the multi-layer heat insulation core 4, multiple clamping positions are selected at intervals along the circumference of the multi-layer heat insulation core 4. At each clamping position, a section of stainless steel wire 8 is set to form an independent local clamping unit, instead of continuously winding a single stainless steel wire 8 along the circumference.

[0087] Specifically, for each clamping position, one end of the corresponding stainless steel wire 8 is passed through the nickel foil strip 7 and the multi-layer heat insulation core 4, and then the passed end is connected to the other end of the stainless steel wire 8 and tightened, so that the stainless steel wire 8 forms a clamping constraint on the nickel foil strip 7 and the multi-layer heat insulation core 4.

[0088] Within an feasible range, the diameter of the stainless steel wire 8 is 0.15 mm to 0.25 mm; preferably 0.2 mm. During clamping, the tightening degree is controlled according to the local thickness of the multilayer insulation core 4, so that the stainless steel wire 8 can press the nickel foil strip 7 tightly and limit the relative slippage of each layer, while avoiding excessive local clamping force that would cause the high silica fiber cloth 2 to be significantly compacted.

[0089] After the binding is completed, the multi-layer insulation core 4 is cleaned to remove high-silica glass fiber debris, metal shavings and other excess materials generated during the cutting, sealing and binding process. Then check whether the nickel foil strip 7 is continuously covered along the perimeter, whether adjacent winding sections are overlapped, whether the stainless steel wire 8 is reliably tightened, whether there is obvious displacement of each layer, and whether the core surface is clean.

[0090] After the above processing, a high-temperature multilayer heat insulation device with edge sealing and reinforcement can be obtained. For applications where no reflector shell is required, the device in this state can be assembled according to the installation structure; for implementations requiring external protection and end sealing, the reflector shell preparation and core assembly continue.

[0091] In embodiments requiring a reflective screen housing, step S107 is included after step S106: preparing the reflective screen housing and assembling the core to obtain the finished high-temperature multilayer heat insulation device. The preparation of the reflective screen housing includes steps S1071 to S1075, and the core assembly includes steps S1076 to S1077. S1071: Cut stainless steel sheet into rectangular plates.

[0092] S1072: The rectangular plate is stretched to form multiple shell segments.

[0093] S1073: Weld multiple shell segments together to form a hollow shell 5.

[0094] S1074: Weld the two annular sealing rings to both ends of the hollow shell 5 respectively.

[0095] S1075: Polish the hollow shell 5 with the welded annular sealing ring to obtain the reflective screen shell.

[0096] S1076: The multi-layer heat insulation core with sealed edges is nested into the reflector shell.

[0097] S1077: Adjust the assembly gap between the multi-layer heat insulation core and the reflector shell to ensure that the multi-layer heat insulation core remains stable within the reflector shell without significant shaking. In step S1071, the unfolded dimensions of the stainless steel plate are determined according to the design dimensions of the reflector shell, and the stainless steel plate is cut into rectangular plates. Preferably, the stainless steel plate is a 0.2mm thick 1Cr18Ni9Ti stainless steel plate. The cut rectangular plates are used for subsequent stretching to form shell segments, therefore the edges of the plates should meet the forming and welding requirements.

[0098] After the rectangular sheet material is cut, check its length, width, and edge condition, and remove any obvious burrs that may affect the fit of the stretching die or subsequent welding. Oil stains or metal shavings on the sheet surface can be cleaned before stretching to reduce indentations during the forming process.

[0099] In step S1072, a rectangular plate is placed in a stretching mold corresponding to the curvature of the reflector shell, and the rectangular plate is stretched to form shell segments with a predetermined arc and axial length. After stretching, the shell segments have curved contours that facilitate splicing together to form a hollow shell 5.

[0100] After stretch forming is completed, the shell segments can be inspected for obvious cracks, excessive thinning in certain areas, edge warping, or springback that affects assembly. Local edges that affect the fit of adjacent parts can be trimmed to ensure a more stable joint edge when multiple shell segments are assembled.

[0101] In step S1073, multiple shell segments are sequentially assembled according to the circumferential structure of the reflector shell, and the joints between adjacent shell segments are welded to form a hollow shell 5. In one embodiment, eight sets of shell segments are combined and welded.

[0102] The number of shell segments can be determined based on the circumferential dimensions of the reflector shell, the method of segmentation of the curved surface, and the actual processing conditions. Assembling multiple segmented parts reduces the difficulty of forming complex curved surfaces in a single step and facilitates adjustment of local curvature according to the external contour of the solenoid valve. After welding, the internal space of the hollow shell 5 should be able to accommodate the multi-layered heat-insulating core 4 with its edges sealed.

[0103] In step S1074, two annular sealing rings 6 are positioned at the two ends of the hollow shell 5, and welded along the joint between the annular sealing rings 6 and the hollow shell 5, so that the two ends form end sealing structures. During welding, it should be ensured that the position of the annular sealing rings 6 corresponds to the ends of the hollow shell 5, and the impact of welding deformation on the internal assembly space should be minimized.

[0104] After the annular sealing ring 6 is welded, the welding position can be continuously inspected to confirm that there are no obvious unwelded areas or defects affecting the seal at the end. After the end is sealed by two annular sealing rings 6, the reflector shell can form a more complete protective boundary outside the multi-layer heat insulation core 4.

[0105] In step S1075, the hollow shell 5 with two annular sealing rings 6 welded together is polished. The polishing process is preferably completed by an automatic polishing machine to remove burrs, welding defects, and surface protrusions that affect assembly at the welding positions and edges of the sheet metal, so that the outer surface and inner assembly surface of the reflector shell remain relatively flat and smooth.

[0106] During polishing, avoid prolonged and excessive grinding in the same area to prevent significant localized thinning of the thin-walled stainless steel plate. After polishing, remove any residual metal shavings and polishing residue from inside the reflector housing to prevent these residues from entering the multi-layer heat insulation core 4 or coming into contact with the solenoid valve after assembly. The reflector housing is obtained after polishing and cleaning.

[0107] In step S1076, the multi-layer heat insulation core 4, which has been sealed with nickel foil strips 7 and bound with stainless steel wires 8, is nested into the reflector shell. Before installation, the installation direction of the multi-layer heat insulation core 4 is confirmed so that the high-temperature straight-face structure, the universal bonding structure, and the high-strength support structure are respectively facing the pre-designed corresponding areas.

[0108] During the installation process, the multi-layer heat insulation core 4 is gradually inserted into the interior of the reflector shell through the predetermined installation inlet, while avoiding strong scraping between the connecting part of the stainless steel wire 8 and the inner wall of the shell.

[0109] In step S1077, the assembly gap between the multi-layer heat insulation core 4 and the reflective screen housing is adjusted to ensure the multi-layer heat insulation core 4 remains stable inside the reflective screen housing. The assembly gap should allow the multi-layer heat insulation core 4 to be smoothly inserted while limiting its significant shaking under vibration conditions.

[0110] When the local assembly gap is too small, the local contour of the multilayer heat insulation core 4 can be adjusted to conform to its shape, or the local contour of the reflective screen shell can be corrected. When the local gap is too large, the relative position of the core in the shell can be adjusted to make it uniformly match the shell contour. The above adjustments should avoid excessive compaction of the high-silica glass fiber cloth 2 to maintain the spacing between adjacent heat reflective layers.

[0111] After the reflector shell is prepared and the core is assembled, the finished high-temperature multilayer heat insulation device used for the solenoid valve is subjected to final inspection. The final inspection items include at least the product dimensional accuracy, welding sealing, edge sealing firmness and appearance flatness. It can also check whether the multilayer heat insulation core 4 remains stable inside the reflector shell without obvious shaking, and whether the stainless steel wire 8 is loose.

[0112] In one specific embodiment, a universal, laminated, multi-layered heat-insulating core 4 is fabricated for the curved surface area of ​​the solenoid valve. Each heat-reflective layer is made of 0.016mm thick nickel foil 3, and the spacer layer is made of 0.08mm thick BWT100-B2 type high-silica glass fiber cloth 2. A five-unit heat-insulating core blank is formed by alternately stacking six layers of nickel foil 3 and five layers of high-silica glass fiber cloth 2, with nickel foil 3 as the outermost layer on both sides of the blank in the thickness direction.

[0113] The template is attached to the aforementioned insulation core blank, and the outline is drawn along the template and cut as a whole to obtain the semi-finished insulation core. Then, a 2mm wide nickel foil strip 7 is continuously wound around the perimeter of the core, with adjacent winding sections overlapping each other by approximately half the width of the nickel foil strip. Next, 0.2mm diameter stainless steel wires 8 are placed at multiple locations around the perimeter of the core for localized binding. One end of each stainless steel wire 8 passes through the nickel foil strip 7 and the multiple layers of insulation core 4, and is then connected to and tightened at the other end. The resulting universally conformable core has good surface conformability.

[0114] In another specific embodiment, a high-temperature direct-facing multilayer heat insulation core 4 is fabricated for areas directly exposed to high-temperature heat sources or high-temperature airflows. The outermost layer facing the heat source is a 0.05mm thick 1Cr18Ni9Ti stainless steel foil 1, and the remaining heat-reflective layers are 0.016mm thick nickel foil 3. A 0.08mm thick BWT100-B2 type high-silica fiberglass cloth 2 is placed between adjacent heat-reflective layers. This configuration allows the outer stainless steel foil 1 to bear the direct heat and erosion, while the inner nickel foil 3 and high-silica fiberglass cloth 2 continue to form a multilayer heat insulation structure.

[0115] In another specific embodiment, a high-strength, multi-layered heat-insulating core 4 is fabricated for the corners, fixing parts, or assembly support areas of the solenoid valve. Each heat-reflective layer is made of 0.05mm thick 1Cr18Ni9Ti stainless steel foil 1, and a 0.08mm thick BWT100-B2 type high-silica glass fiber cloth 2 is placed between adjacent stainless steel foils 1. The multi-layered stainless steel foil 1 improves the shape retention capability of the corresponding areas, enabling the core to maintain its predetermined contour well after edge sealing, clamping, and assembly with the reflective screen housing.

[0116] In one combined embodiment, a high-temperature direct-face area, a universal bonding area, and a high-strength support area can be simultaneously set in the same multi-layer thermal insulation core 4. During manufacturing, the material configuration areas are first divided according to the working conditions of different positions around the solenoid valve, and then in step S103, the materials of each area are stacked synchronously. Subsequently, the overall thermal insulation core blank is shaped and cut using the same shaping template, and the different configuration areas are formed into an integral core by continuous nickel foil edge sealing and multiple stainless steel wire local binding.

[0117] The high-temperature multilayer thermal insulation device for solenoid valves prepared in this embodiment can withstand temperatures ranging from 700°C to 1800°C, with an optimal operating temperature of 1100°C to 1300°C and a maximum allowable long-term operating temperature exceeding 1200°C. The overall thermal conductivity is less than 0.03 W / (m·K).

[0118] The multi-layered thermal insulation structure formed by metal foil and high-silica fiberglass cloth can reduce the weight per unit area while maintaining thermal insulation capacity; it has a significant weight reduction effect compared to traditional thermal insulation pads. When heat is transferred from the external high-temperature environment to the solenoid valve, it is first reflected by the radiation of the reflector shell and the outer heat-reflecting layer. The remaining heat after entering the multi-layered thermal insulation core 4 continues to pass through an alternating layered path composed of multiple heat-reflecting layers and high-silica fiberglass cloth 2. Nickel foil strips 7 form a continuous cover on the edge of the core, and the local clamping positions of multiple stainless steel wires 8 are distributed along the perimeter, thereby maintaining the stability of the sealing edge and the stacking position under vibration.

[0119] The above embodiments provide a detailed description of the multi-layer heat insulation core, edge sealing structure, clamping components, reflective screen shell, and corresponding manufacturing steps as described in the claims. Those skilled in the art can adapt or adjust the number of layers, outline dimensions, number of shell segments, and conventional processing equipment according to the specific thermal environment and installation conditions of the power unit without departing from the inventive concept.

Claims

1. A high-temperature multilayer heat insulation device for a solenoid valve, characterized in that, Includes a multi-layered insulation core and edge sealing structure; The multi-layer heat insulation core includes multiple heat-reflective layers and multiple spacer layers that are alternately stacked along the thickness direction. A spacer layer is provided between two adjacent heat-reflective layers. The heat-reflective layers are the outermost layers on both sides of the multi-layer heat insulation core along the thickness direction. The edge sealing structure includes a metal foil edge sealing member, which is continuously arranged along the periphery of the multi-layer heat insulation core, spans the edge of the multi-layer heat insulation core and extends to cover the surface areas near the periphery on both sides of the thickness direction of the multi-layer heat insulation core, so as to continuously cover the exposed edges of each heat reflective layer and each spacer layer.

2. The high-temperature multilayer heat insulation device for a solenoid valve according to claim 1, characterized in that, It also includes a plurality of clamping members, which are spaced apart circumferentially along the multilayer heat insulation core; each clamping member has a first end and a second end, the first end passing through the metal foil edge seal and the multilayer heat insulation core, and connected to the second end, so that the clamping member forms a clamping constraint on the multilayer heat insulation core and the metal foil edge seal located on its surface.

3. The high-temperature multilayer heat insulation device for a solenoid valve according to claim 2, characterized in that, The metal foil sealing component includes a nickel foil strip with a width of 1.5mm to 2.5mm. The nickel foil strip is continuously wound around the periphery of the multilayer heat insulation core, and the overlap width of adjacent winding sections is 40% to 60% of the width of the nickel foil strip. The clamping component includes a stainless steel wire, one end of which passes through the nickel foil strip and the multi-layer heat insulation core and is connected to the other end. The diameter of the stainless steel wire is 0.15mm to 0.25mm.

4. The high-temperature multilayer heat insulation device for a solenoid valve according to claim 1, characterized in that, The heat-reflective layer comprises at least one of stainless steel foil and nickel foil, and the spacer layer comprises high-silica glass fiber cloth; The stainless steel foil has a thickness of 0.04 mm to 0.06 mm, the nickel foil has a thickness of 0.012 mm to 0.020 mm, and the high-silica glass fiber cloth has a thickness of 0.06 mm to 0.10 mm. The multi-layer heat insulation core includes material configuration areas corresponding to each heat-insulating area of ​​the solenoid valve, and each material configuration area adopts any one of the following: high-temperature straight-face structure, general-purpose bonding structure, and high-strength support structure. In the high-temperature straight-face structure, the outermost heat-reflective layer on the side facing the heat source is a stainless steel foil, and each heat-reflective layer inside the outermost heat-reflective layer is a nickel foil. Each heat-reflective layer in the general-purpose bonding structure is the nickel foil; Each heat-reflective layer in the high-strength support structure is made of the stainless steel foil.

5. The high-temperature multilayer heat insulation device for a solenoid valve according to claim 1, characterized in that, It also includes a reflective screen housing, which comprises multiple housing segments and two annular sealing rings; Multiple shell segments are welded together to form a hollow shell, and the multi-layer heat-insulating core is nested inside the hollow shell; The two annular sealing rings are respectively welded to both ends of the hollow shell to form an end sealing structure; The shell segment includes a stainless steel plate with a thickness of 0.15mm to 0.25mm.

6. A method for manufacturing a high-temperature multilayer heat insulation device for a solenoid valve, characterized in that, Includes the following steps: Based on the high-temperature scouring conditions, curved surface fitting conditions, and support strength requirements of different heat-insulating areas of the solenoid valve, the core type corresponding to each heat-insulating area is determined respectively; According to the design dimensions of the multi-layer heat insulation core, the heat reflective layer material and the spacer layer material are pre-cut. According to the core type corresponding to each heat-insulating area, the pre-cut heat-reflective layer material and the spacer layer material are alternately stacked along the thickness direction to form a heat-insulating core blank. A spacer layer material is provided between two adjacent heat-reflective layer materials, and the heat-reflective layer material is used as the outermost layer on both sides of the heat-insulating core blank along the thickness direction. Based on the shape of the area to be insulated by the solenoid valve, the cutting outline is determined on the insulation core blank; The heat insulation core blank is cut along the cutting contour to obtain a multi-layer heat insulation core including multiple heat reflective layers and multiple spacer layers. The metal foil sealing element is continuously wound around the periphery of the multilayer heat insulation core, so that the metal foil sealing element crosses the edge of the multilayer heat insulation core and extends to both sides of the thickness direction of the multilayer heat insulation core, so as to continuously cover the exposed edges of each heat reflective layer and each spacer layer, thereby obtaining the high-temperature multilayer heat insulation device for the solenoid valve.

7. The method for manufacturing a high-temperature multilayer heat insulation device for a solenoid valve according to claim 6, characterized in that, The heat reflective layer material includes at least one of stainless steel foil and nickel foil, and the spacer layer material includes high silica glass fiber cloth. Before pre-cutting the heat reflective layer material and the spacer layer material, if the size of a single piece of stainless steel foil is smaller than the pre-cut size determined according to the design size of the multilayer heat insulation core, at least two pieces of stainless steel foil are roll-welded together.

8. The method for manufacturing a high-temperature multilayer heat insulation device for a solenoid valve according to claim 6, characterized in that, The core type includes at least one of high-temperature flat type, universal bonding type and high-strength support type; For the heat-reflecting area with a high-temperature straight-face core, stainless steel foil is selected as the outermost heat-reflecting layer material corresponding to the heat-reflecting area and located on the heat source side, and nickel foil is selected as the remaining heat-reflecting layer materials corresponding to the heat-reflecting area. For the heat-reflective layer area with a general-purpose bonding core, nickel foil is selected as the material for each heat-reflective layer corresponding to the heat-reflective layer area. For the heat-reflective layer area with a high-strength support core, stainless steel foil is selected as the material for each heat-reflective layer corresponding to the heat-reflective layer area. According to the core type corresponding to each of the heat-insulating areas, the heat-reflective layer material and the spacer layer material are alternately stacked along the thickness direction to form a material configuration area corresponding to the working conditions of each of the heat-insulating areas.

9. The method for manufacturing a high-temperature multilayer heat insulation device for a solenoid valve according to claim 6, characterized in that, When determining the cutting contour on the heat insulation core blank according to the shape of the area to be insulated of the solenoid valve, a shaping template corresponding to the shape of the area to be insulated of the solenoid valve is attached to the heat insulation core blank. A contour line is drawn on the heat insulation core blank along the shaping template, and the contour line is used as the cutting contour. When cutting the insulation core blank along the cutting contour, the insulation core blank is cut along the contour line to obtain the multi-layer insulation core. When the metal foil sealing piece is continuously wound around the periphery of the multilayer heat insulation core, the nickel foil strip is continuously wound around the periphery of the multilayer heat insulation core, so that adjacent winding segments overlap each other. After the nickel foil strip is continuously wound around the periphery of the multi-layer heat insulation core, multiple clamping positions are set at intervals along the circumference of the multi-layer heat insulation core, and a section of stainless steel wire is set at each clamping position. One end of each section of stainless steel wire is passed through the nickel foil strip and the multi-layer heat insulation core, and one end of the passed stainless steel wire is connected to the other end to clamp the multi-layer heat insulation core and the nickel foil strip.

10. The method for manufacturing a high-temperature multilayer heat insulation device for a solenoid valve according to claim 6, characterized in that, After continuously winding the metal foil sealing piece along the periphery of the multilayer heat insulation core, the reflective screen shell is prepared and the core is assembled. The preparation of the reflective screen housing includes: Cut the stainless steel sheet into rectangular pieces; The rectangular plate is stretched to form multiple shell segments; Multiple shell segments are welded together to form a hollow shell; Two annular sealing rings are welded to both ends of the hollow shell, respectively; The hollow shell with the welded annular sealing ring is polished to obtain the reflective screen shell; The core assembly includes: nesting the sealed multi-layer heat insulation core into the reflective screen shell; Adjust the assembly gap between the multi-layer heat insulation core and the reflective screen housing to keep the multi-layer heat insulation core stable and without significant shaking within the reflective screen housing.

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