Heat insulation structure and working machine comprising same

Abstract

The utility model relates to a heat insulation structure and an operation machine comprising the heat insulation structure. The heat insulation structure comprises a flexible heat insulation body, the heat insulation body comprises a heat source side metal layer, a first protection layer, a heat insulation layer, a second protection layer and a non-heat-source side metal layer which are sequentially distributed in a stacked mode from the side close to a heat source to the side away from the heat source, and the heat source side metal layer and the non-heat-source side metal layer are composed of stainless steel wire cloth. The first protection layer located between the heat source side metal layer and the heat insulation layer is composed of vermiculite coating glass fiber cloth. According to the heat insulation structure, the high-density stainless steel cloth is used as the outermost layer protection material of the heat insulation structure, the material layer on the inner side can be protected against abrasion, the strength of the whole structure is improved, the washing pressure of high-pressure water can be resisted, and the heat insulation structure has high corrosion resistance; the heat insulation protection requirement is better met, and good toughness is achieved.

Description

Technical Field

[0001] This utility model relates to the field of engine technology, and more specifically to a heat insulation structure, particularly for use in engines of construction machinery. Background Technology

[0002] In construction machinery, engines, especially engine exhaust pipes, are a major heat source due to their long-term operation in high-temperature environments. To prevent the aging or damage of components around the engine due to high temperatures, or to meet the aftertreatment insulation requirements in some high-emission applications, it is usually necessary to install suitable heat insulation structures (such as heat shields) for these heat-generating components to effectively block heat release.

[0003] Because the operating environment of machinery is often harsh, with high levels of dust pollution, high-pressure washing is frequently required. Existing heat insulation structures for engines typically cannot withstand the pressure of high-pressure water and the corrosiveness of detergents. Furthermore, known heat insulation structures often lose their insulation and protective properties prematurely due to the premature failure of internal insulation or protective layers. Therefore, there is a need to propose a heat insulation structure with improved insulation and protective performance. Utility Model Content

[0004] This invention is proposed against this background, and its purpose is to provide an improved thermal insulation structure that can overcome one or more of the problems mentioned above in the prior art.

[0005] According to a first aspect of the present invention, a heat insulation structure is provided, the heat insulation structure comprising a flexible heat insulation body, the heat insulation body comprising a heat source side metal layer, a first protective layer, a heat insulation layer, a second protective layer, and a non-heat source side metal layer, which are sequentially stacked from the side near the heat source toward the side away from the heat source, wherein the heat source side metal layer and the non-heat source side metal layer are made of stainless steel wire cloth; the first protective layer located between the heat source side metal layer and the heat insulation layer is made of vermiculite-coated glass fiber cloth.

[0006] In one embodiment, the stainless steel wire cloth is woven from stainless steel wires with a diameter of no more than 0.2 mm.

[0007] In one embodiment, the stainless steel wire cloth has a mesh count greater than 50.

[0008] In one embodiment, the insulation layer includes any one of the following: an aerosol layer, a ceramic fiber layer, a high-silica foam layer, and a glass fiber layer.

[0009] In one embodiment, the second protective layer located between the insulation layer and the non-heat source side metal layer includes any one of the following: silicone-coated fiberglass cloth and Teflon-coated fiberglass cloth.

[0010] In one embodiment, the heat source side metal layer, the first protective layer, the heat insulation layer, the second protective layer, and the non-heat source side metal layer, which are sequentially stacked in the heat insulation body, are sealed and fixed by sewing stainless steel wire around their perimeter.

[0011] In one embodiment, the heat insulation body is formed into a cuboid structure, with a hook provided at the first longitudinal end of the cuboid structure and a spring provided at the opposite second longitudinal end, so that the flexible heat insulation body can be enclosed on the heat-generating component that serves as a heat source by the hook-and-loop engagement of the hook and the spring.

[0012] According to a second aspect of the present invention, a working machine is provided, the working machine comprising an engine and a heat insulation structure as described above disposed on at least one heat-generating component of the engine.

[0013] The heat insulation structure according to this utility model has at least one of the following technical effects compared to the prior art: using high-density stainless steel wire cloth as the outermost protective material of the heat insulation structure not only protects the inner material layer from wear and increases the strength of the overall structure, but also meets the flushing pressure during high-pressure water washing and has high corrosion resistance; the first protective layer between the heat source side metal layer and the heat insulation layer in the heat insulation structure is composed of vermiculite-coated glass fiber cloth (temperature limit up to 800℃), which can well meet the heat insulation protection requirements and also provide better flexibility for the entire heat insulation structure. Attached Figure Description

[0014] The above and other features and advantages of this utility model will become more readily understood from the following description with reference to the accompanying drawings, in which:

[0015] Figure 1 A perspective view of a heat insulation structure according to an embodiment of the present invention is shown.

[0016] The accompanying drawings are merely illustrative and not necessarily drawn to scale. Furthermore, they only show those parts necessary to illustrate the present invention; other parts are omitted or merely mentioned. That is, the present invention may include other parts besides those shown in the drawings. Detailed Implementation

[0017] In the following description, numerous specific details are set forth to enable those skilled in the art to gain a more complete understanding of the present invention. However, it will be apparent to those skilled in the art that implementations of the present invention may not include some of these specific details. The various aspects, features, embodiments, and advantages described below are for illustrative purposes only and should not be construed as elements or limitations of the claims, unless expressly set forth in the claims. Terms such as "first," "second," etc., are used hereinafter to describe elements of this application; these terms are used only to distinguish individual elements and are not intended to limit the nature, sequence, order, or number of these elements. Furthermore, it should be noted that in this specification, identical and / or functionally identical technical features are represented by the same or similar reference numerals.

[0018] This invention proposes a heat insulation structure comprising a flexible heat insulation body. The heat insulation body includes a heat source-side metal layer 1, a first protective layer 2, a heat insulation layer 3, a second protective layer 4, and a non-heat source-side metal layer 5, sequentially stacked from the side closest to the heat source towards the side furthest from the heat source. Unlike known heat insulation structures in the prior art, the heat source-side metal layer 1 and the non-heat source-side metal layer 5 in this invention are composed of high-density stainless steel wire cloth.

[0019] The "stainless steel wire cloth" mentioned in this article preferably refers to commercially available high-density stainless steel wire cloth, which is a mesh woven from stainless steel wire. Due to its high strength and resistance to acids and alkalis, stainless steel wire cloth is widely used in industries such as chemical, pharmaceutical, hygiene, light industry, telecommunications, and petroleum. In the design of the thermal insulation structure for engine exhaust pipes, the applicant is the first to use high-density stainless steel wire cloth as the outermost protective material of the thermal insulation structure. This not only protects the inner material layer from wear and increases the overall structural strength, but also meets the requirements of resisting the rinsing pressure of high-pressure water washing in specific application scenarios and has high corrosion resistance.

[0020] Furthermore, the term "high density" mentioned herein refers to stainless steel mesh with larger apertures known in the prior art. Stainless steel mesh typically has visible openings, which reduce the protective effect on other material layers arranged inside the mesh. Since thermal insulation structures are often used on the heat-generating components of machinery engines, external dust can penetrate these visible openings and reach the inner material layers, causing wear and corrosion. Therefore, the high-density stainless steel wire cloth of this invention, with its higher weave density (e.g., a mesh count greater than 50), provides better and more effective protection for the inner material layers. To some extent, the use of this stainless steel wire cloth not only retains the low-cost characteristics of soft thermal insulation covers but also significantly extends the product's lifespan.

[0021] To ensure good flexibility of the insulation structure, the stainless steel wire cloth constituting the heat source side metal layer and the non-heat source side metal layer in the insulation structure is preferably woven from stainless steel wire with a wire diameter of no more than 0.2 mm.

[0022] exist Figure 1 In the heat insulation structure shown, the first protective layer 2 located between the heat source-side metal layer 1 and the heat insulation layer 3 is preferably composed of vermiculite-coated fiberglass cloth. This differs from the silicone-coated fiberglass cloth and high-silica fiberglass cloth used in the prior art. It should be understood that the temperature limit of the silicone coating in the silicone-coated fiberglass cloth in the prior art is usually around 260°C, while high-silica fiberglass cloth has lower toughness (high brittleness and prone to premature failure). These factors make them unsuitable as heat source-side protective layers to provide effective heat insulation protection.

[0023] In this embodiment of the invention, the applicant proposes for the first time the application of vermiculite-coated fiberglass cloth in a multi-layer thermal insulation structure, particularly as a protective layer on the heat source side of the insulation layer. Since the first protective layer 2 is located between the heat source-side metal layer 1 and the insulation layer 3, and is closer to the heat source side than the second protective layer 4, the use of vermiculite-coated fiberglass cloth is highly advantageous. This is because vermiculite-coated fiberglass cloth has a higher heat resistance temperature (up to 800℃), thus effectively meeting the thermal insulation protection requirements, while also possessing good toughness. Of course, depending on the customer's specific operating conditions and cost requirements, uncoated fiberglass cloth (i.e., conventional fiberglass cloth) can also be considered as the protective layer on the heat source side of the insulation layer. This uncoated fiberglass cloth is more cost-effective than vermiculite-coated fiberglass cloth, and its heat resistance temperature is typically 500-600℃.

[0024] During the manufacturing process of the thermal insulation structure, after the heat source side metal layer 1, the first protective layer 2, the thermal insulation layer 3, the second protective layer 4, and the non-heat source side metal layer 5 are sequentially stacked, stainless steel wire cloth can be sewn around the perimeter of these stacked layers to seal and fix them, for example, forming a cuboid structure. To apply this thermal insulation structure to a heating element, a hook can be provided at the first longitudinal end of the cuboid structure, and a spring can be provided at the opposite second longitudinal end, so that the flexible thermal insulation body can be enclosed on the heating element through the hook-and-loop engagement of the hook and the spring. Of course, other fixing structures known in the art are also feasible, as long as they can achieve the functions described above.

[0025] In a specific embodiment, the thermal insulation layer 3 comprises any one of the following: an aerosol layer, a ceramic fiber layer, a high-silica foam layer, and a fiberglass layer (which may be commercially available), to provide reliable thermal insulation performance. The second protective layer 4, located between the thermal insulation layer 3 and the non-heat source side metal layer 5, is selected from any one of the following: silicone-coated fiberglass cloth and Teflon-coated fiberglass cloth (which may be commercially available). Both silicone-coated fiberglass cloth and Teflon-coated fiberglass cloth can provide excellent waterproofing, dustproofing, and protection against fiber penetration of the thermal insulation material, while Teflon-coated fiberglass cloth offers better resistance to chemical corrosion compared to silicone-coated fiberglass cloth. It should be understood that the specific material selection and arrangement of these thermal insulation layers and the second protective layer can be determined according to actual application requirements, as long as the intended thermal insulation and protective performance is provided.

[0026] Industrial applicability

[0027] While the heat insulation structure of this invention, as mentioned above, is applicable to heat-generating components of an engine (such as an exhaust pipe), this is not intended to limit its use in other fields or structures. For example, the heat insulation structure can be applied to any other heat-generating component requiring heat insulation protection.

[0028] When heat insulation structures are applied to the engines of mining machinery, the machinery often requires high-pressure water jets to wash away dust near the engine, and detergents are also used, especially in harsh mining environments. Existing heat insulation structures cannot meet these requirements for high pressure resistance and corrosion resistance. The heat insulation structure proposed in this invention, with its outer surface covered in high-density stainless steel wire cloth, exhibits higher wear resistance, better overall structural strength, and, importantly, superior corrosion resistance.

[0029] In addition, for example, when this heat insulation structure is used on the exhaust pipe of an engine, the heat generation temperature of the exhaust pipe is usually between 450-600°C. Since the first protective layer located between the metal layer on the heat source side and the heat insulation layer is made of vermiculite-coated fiberglass cloth, its heat resistance temperature can reach 800°C, thus it can well meet the heat insulation protection requirements and also has good toughness.

[0030] It should be noted that the embodiments described above should be considered exemplary only, and the present invention is not limited to these embodiments. By considering the contents of this specification, those skilled in the art can make various changes and modifications without departing from the scope or spirit of the present invention. The true scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A heat insulation structure comprising a flexible heat insulation body, the heat insulation body comprising a heat source-side metal layer (1), a first protective layer (2), a heat insulation layer (3), a second protective layer (4), and a non-heat source-side metal layer (5), sequentially stacked from the side closest to the heat source toward the side furthest from the heat source, characterized in that, The heat source side metal layer (1) and the non-heat source side metal layer (5) are made of stainless steel wire cloth; the first protective layer (2) located between the heat source side metal layer (1) and the heat insulation layer (3) is made of vermiculite coated glass fiber cloth; the stainless steel wire cloth is woven from stainless steel wire with a diameter of no more than 0.2 mm; the mesh count of the stainless steel wire cloth is greater than 50.

2. The heat insulation structure according to claim 1, characterized in that, The insulation layer includes any one of the following: aerosol layer, ceramic fiber layer, high silica cotton layer and glass fiber layer.

3. The heat insulation structure according to claim 1, characterized in that, The second protective layer (4) located between the heat insulation layer (3) and the non-heat source side metal layer (5) includes any one of the following: silicone coated fiberglass cloth and Teflon coated fiberglass cloth.

4. The heat insulation structure according to claim 1, characterized in that, The heat source side metal layer (1), first protective layer (2), heat insulation layer (3), second protective layer (4) and non-heat source side metal layer (5) that are stacked sequentially in the heat insulation body are sealed and fixed by sewing stainless steel wire cloth around their perimeter.

5. The heat insulation structure according to claim 1, characterized in that, The heat insulation body is formed into a cuboid structure. A hook is provided at the first longitudinal end of the cuboid structure and a spring is provided at the opposite second longitudinal end, so that the flexible heat insulation body can be enclosed on the heat-generating component, which is a heat source, by the hook and spring engaging.

6. A type of operating machinery, characterized in that, The operating machinery includes an engine and a heat insulation structure according to any one of claims 1 to 5 disposed on at least one heat-generating component of the engine.

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