Elbow heat preservation sleeve and heat preservation elbow assembly

Abstract

The elbow heat preservation sleeve at least comprises a plurality of first hard heat preservation units which are distributed along an arc line of a central axis, and each first hard heat preservation unit comprises at least two first hard heat preservation layers which are distributed in the radial direction perpendicular to the central axis. The first hard heat preservation layers of the adjacent hard heat preservation units are correspondingly spliced to form longitudinal splicing seams, soft buffering pieces are arranged in the longitudinal splicing seams, and adhesives are adopted in the longitudinal splicing seams to fill gaps outside the soft buffering pieces and adhere to the adjacent first hard heat preservation layers. According to the scheme, the anti-pressure capacity and the overall mechanical strength of the elbow heat preservation sleeve are enhanced, the soft buffering pieces are arranged at the splicing positions of the adjacent first hard heat preservation units, the adhesive can fill gaps outside the soft buffering pieces in the longitudinal splicing gaps, and therefore the sealing performance of the elbow heat preservation sleeve is improved, and the service life of the elbow heat preservation sleeve is prolonged. The problem that the heat preservation performance of the elbow heat preservation sleeve is seriously degraded due to water leakage is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of thermal pipe insulation, in particular to an elbow insulation sleeve and an insulation elbow component. Background Art

[0002] For overhead steam pipelines, in order to reduce heat loss in the pipeline, it is usually necessary to cover the pipeline with insulation material (insulation sleeve).

[0003] Traditional insulation structures use soft insulation materials, which have the following defects: the soft insulation structure has low pressure resistance and overall mechanical strength, and is prone to sagging after long-term use, resulting in reduced insulation performance. In actual use, the soft insulation structure is also easily damaged by external forces and deformed, resulting in reduced pipe insulation performance. In addition, the sealing of the insulation structure is difficult to achieve the expected value. During long-term operation, the insulation sleeve is prone to deformation or even falling off, and the insulation performance is seriously attenuated. The overall waterproof performance of the insulation pipe is insufficient, resulting in the insulation material being in a water-containing state for a long time, which further deteriorates the overall performance of the insulation pipe. Especially for elbow pipe fittings, due to their non-long straight cross-section structure, the quality of the insulation sleeve construction and the insulation performance are more difficult to guarantee. Utility Model Content

[0004] The utility model provides an elbow insulation sleeve and an insulation elbow assembly, so as to solve the problems in the prior art that the insulation structure has low pressure resistance and overall mechanical strength, and insufficient waterproof performance.

[0005] In order to solve the above technical problems, the technical solution provided by the utility model is:

[0006] In a first aspect, an elbow insulation sleeve is provided, wherein the elbow insulation sleeve is defined with a central axis, the elbow insulation sleeve extends along the central axis, and at least a portion of the central axis is an arc; the elbow insulation sleeve comprises at least a plurality of first hard insulation units distributed along the arc of the central axis, each of the first hard insulation units comprises at least two first hard insulation layers distributed along a radial direction perpendicular to the central axis, the first hard insulation layers of adjacent hard insulation units are correspondingly spliced ​​to form a longitudinal seam, a soft buffer is arranged in the longitudinal seam, and an adhesive is used in the longitudinal seam to fill the gap outside the soft buffer and bond the adjacent first hard insulation layers.

[0007] Optionally, the longitudinal seams of each layer are staggered along the central axis to form one of a male seam or a female seam at any one end of the first rigid thermal insulation unit along the central axis, and used to achieve male-female splicing with the female seam or male seam at the end of the adjacent first rigid thermal insulation unit.

[0008] Optionally, the soft buffer is made of aerogel.

[0009] Optionally, the elbow insulation cover also includes a soft insulation unit and a second hard insulation unit, the soft insulation unit includes a soft insulation layer, the second hard insulation unit includes a second hard insulation layer, the soft insulation layer is located on the inner side of the at least two first hard insulation layers in the radial direction, and the second hard insulation layer is located on the outer side of the at least two first hard insulation layers in the radial direction.

[0010] Optionally, the first hard thermal insulation unit and the second hard thermal insulation unit form a hard thermal insulation structure; the hard thermal insulation structure includes three hard splicing units distributed along the arc of the central axis, and the soft thermal insulation unit covers the three hard splicing units along the central axis, and the three hard splicing units are respectively a first section, a tail section, and a middle section connected between the first section and the tail section; the first section and the tail section both include a first hard thermal insulation unit and a second hard thermal insulation unit distributed in sequence from inside to outside along the radial direction; the middle section includes a second hard thermal insulation unit and at least two first hard thermal insulation units distributed in sequence from outside to inside along the radial direction, and the second hard thermal insulation unit in the middle section covers the at least two first hard thermal insulation units.

[0011] Optionally, the soft thermal insulation layer includes an aerogel thermal insulation layer; and / or, the first hard thermal insulation layer includes a calcium silicate thermal insulation layer; and / or, the second hard thermal insulation layer includes a polyurethane foam layer.

[0012] Optionally, the elbow insulation sleeve further comprises a heat reflecting layer, and the heat reflecting layer is located between the at least two first hard insulation layers and the second hard insulation layer in the radial direction.

[0013] Optionally, the elbow insulation sleeve also includes an outer protective layer, which is located outside the second hard insulation layer in the radial direction; the outer protective layer includes a plurality of protective layer units distributed along the arc of the central axis, and two adjacent protective layer units are connected at the opposite ends in the direction of the central axis using male and female joints.

[0014] In a second aspect, an insulated elbow assembly is provided, characterized in that it comprises an elbow core tube and the above-mentioned elbow insulation sleeve, wherein the elbow insulation sleeve wraps the elbow core tube.

[0015] Optionally, the insulation elbow assembly also includes a fixing plate, which is fixed to the outer wall of the elbow core tube and attached to the end surface of the elbow insulation sleeve to limit the sliding of the elbow insulation sleeve relative to the elbow core tube along the central axis direction.

[0016] The beneficial effects of the utility model are:

[0017] The utility model provides an elbow insulation sleeve and an insulation elbow assembly, wherein the elbow insulation sleeve is formed by splicing a plurality of first hard insulation units, thereby enhancing the pressure resistance and the overall mechanical strength of the elbow insulation sleeve, and a soft buffer is arranged at the splicing position of adjacent first hard insulation units, the soft buffer is used to separate the corresponding spliced ​​first hard insulation layers of adjacent first hard insulation units, and avoid rigid contact between adjacent first hard insulation layers, and an adhesive is used to fill the gap outside the soft buffer in the longitudinal seam and bond the adjacent first hard insulation layers, the adhesive can fill the gap outside the soft buffer in the longitudinal seam to improve the sealing of the elbow insulation sleeve, avoid the problem of serious attenuation of the insulation performance of the elbow insulation sleeve due to water leakage, thereby extending the service life of the elbow insulation sleeve. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative work, among which:

[0019] Figure 1 It is a structural schematic diagram of an embodiment of a thermal insulation elbow assembly provided by the utility model;

[0020] Figure 2 It is a structural schematic diagram of an embodiment of an elbow insulation cover provided by the utility model;

[0021] Figure 3 yes Figure 2 Schematic diagram of the disassembled structure of the elbow insulation cover;

[0022] Figure 4 yes Figure 2 An enlarged view of the longitudinal seam inside the elbow insulation sleeve;

[0023] Figure 5 It is a structural schematic diagram of another embodiment of the elbow insulation cover provided by the utility model;

[0024] Figure 6 yes Figure 5 Schematic diagram of the installation process of the thermal insulation elbow assembly;

[0025] Figure 7 It is a structural schematic diagram of another embodiment of the thermal insulation elbow assembly provided by the utility model.

[0026] Description of reference numerals:

[0027] Elbow insulation sleeve 100, first hard insulation unit 110, first hard insulation layer 111, soft insulation layer 121, second hard insulation layer 131, longitudinal joint 101, soft buffer 102, adhesive 103, soft insulation unit 100a, hard insulation structure 100b, first section 110b, middle section 120b, tail section 130b, elbow core tube 200, fixing plate 300, center axis R. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0029] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present invention. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0030] The terms "first", "second" and "third" in the present utility model are only used for descriptive purposes and cannot be understood as indicating the number of indicated technical features. Thus, the features defined as "first", "second" and "third" may explicitly or implicitly include at least one of the features. All directional indications (such as up, down, left, right, front, back...) in the embodiments of the present utility model are only used to explain the relative position relationship, movement, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication also changes accordingly. In addition, the terms "include" and "have" and any of their variations are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not limited to the listed steps or units, but optionally includes steps or units that are not listed, or optionally includes other steps or units inherent to these processes, methods, products or devices.

[0031] The utility model provides a thermal insulation elbow assembly, please refer to Figure 1 , Figure 1The structure diagram of an embodiment of the thermal insulation elbow assembly provided by the utility model includes an elbow core tube 200 and an elbow thermal insulation sleeve 100. The elbow core tube 200 is used to transport a medium that needs thermal insulation, such as high-temperature steam, etc. The elbow thermal insulation sleeve 100 wraps the elbow core tube 200 to achieve thermal insulation for the elbow core tube 200. The specific structure of the elbow thermal insulation sleeve 100 refers to the following embodiment.

[0032] See also Figure 2 , Figure 2 It is a structural schematic diagram of an embodiment of an elbow insulation sleeve provided by the utility model, the elbow insulation sleeve 100 is defined with a central axis R, the elbow insulation sleeve 100 extends along the central axis R, at least a portion of the central axis R is an arc, illustratively, the entire central axis R is an arc, and the central angle corresponding to the central axis R is a value greater than 0° and less than 360°, such as 60°, 90°, 120°, etc.; or, a portion of the central axis R is an arc, a straight line is connected to one end or both ends of the arc, and the central angle corresponding to the arc portion is a value greater than 0° and less than 360°, such as 60°, 90°, 120°, etc. Figure 1 The illustrated embodiment shows a situation where the central axis R is entirely an arc, and the central angle corresponding to the central axis R is 90°.

[0033] The elbow insulation sleeve 100 includes at least a plurality of first hard insulation units 110 distributed along the arc of the central axis R. For example, the plurality of first hard insulation units 110 may be three, four, five, etc. Figure 2 The elbow insulation sleeve 100 includes five first hard insulation units 110. Figure 3 , Figure 3 yes Figure 2 Schematic diagram of the disassembled structure of the elbow insulation cover 100, the five first rigid insulation units 110 are respectively first rigid insulation units 110a, 110b, 110c, 110d and 110d.

[0034] Each first hard insulation unit 110 includes at least two first hard insulation layers 111 distributed in a radial direction perpendicular to the central axis R. Exemplarily, the number of first hard insulation layers 111 of each first hard insulation unit 110 is two, three or more layers. Figure 2 and Figure 3 The first hard heat-insulating layer 111 of the first hard heat-insulating unit 110 is shown as having two layers.

[0035] The first hard insulation layers 111 of adjacent hard insulation units 110 are correspondingly spliced ​​to form a longitudinal seam 101. The corresponding splicing of the first hard insulation layers 111 means that the first layers of the first hard insulation layers 111 of adjacent hard insulation units 110 are spliced, and the second layers of the first hard insulation layers 111 of adjacent hard insulation units 110 are spliced.

[0036] See also Figure 4 , Figure 4 yes Figure 2 The enlarged view of the longitudinal seam 101 in the elbow insulation cover 100 is shown in FIG. A soft buffer 102 is provided in the longitudinal seam 101. The soft buffer 102 is used to separate the corresponding first hard insulation layers 111 of the adjacent hard insulation units 110 to avoid rigid contact between the adjacent first hard insulation layers 111. An adhesive 103 is used to fill the gap outside the soft buffer 102 in the longitudinal seam 101 and bond the adjacent first hard insulation layers 111. The adhesive 103 can fill the gap outside the soft buffer 102 in the longitudinal seam 101 to avoid the problem of serious attenuation of the insulation performance of the elbow insulation cover 100 due to water leakage, thereby extending the service life of the elbow insulation cover 100. The thickness of the soft buffer 102 can be 10 mm or other values, and the thickness of the adhesive 103 filling the seam should not be greater than 3 mm.

[0037] It can be seen that the elbow insulation cover 100 of the utility model is formed by splicing a plurality of first hard insulation units 110, which enhances the pressure resistance and overall mechanical strength of the elbow insulation cover 100, and a soft buffer 102 is provided at the joints of adjacent first hard insulation units 110. The soft buffer 102 is used to separate the correspondingly spliced ​​first hard insulation layers 111 of adjacent first hard insulation units 110 to avoid rigid contact between adjacent first hard insulation layers 111, and an adhesive 103 is used in the longitudinal seam 101 to fill the gap outside the soft buffer 102 and bond the adjacent first hard insulation layers 111. The adhesive 103 can fill the gap outside the soft buffer 102 in the longitudinal seam 101 to improve the sealing of the elbow insulation cover 100, avoid the problem of serious attenuation of the insulation performance of the elbow insulation cover 100 due to water leakage, and thus extend the service life of the elbow insulation cover 100.

[0038] See again Figure 2 and Figure 3In this embodiment, the longitudinal seams 101 of each layer are staggered to form one of the male seams or female seams at any end of the first rigid heat-insulating unit 110 along the central axis R, and are used to achieve male-female splicing with the female seam or male seam at the end of the adjacent first rigid heat-insulating unit 110. The staggered arrangement of the longitudinal seams 101 of each layer means that the longitudinal seams 101 of each layer do not overlap. The meaning of forming one of the male seams or female seams at any end of the first rigid heat-insulating unit 110 along the central axis R means that both ends of the first rigid heat-insulating unit 110 along the central axis R can be male seams, both ends can be female seams, or one end of the two ends can be male seams and the other end can be female seams. The meaning of male seams and female seams means that on the end surface of the first rigid heat-insulating unit 110 along the central axis R, the one with a protruding part is a male seam, and the one with a concave part is a female seam, and the protruding part and the concave part cooperate with each other to achieve male-female splicing.

[0039] In some embodiments, the soft buffer 102 is made of aerogel, and the aerogel is preferably nano-scale aerogel.

[0040] In order to facilitate wrapping of each first rigid heat-insulating unit 110 to the outside of the elbow core tube 200, each first rigid heat-insulating unit 110 has at least two petals along the annular direction of the elbow core tube 200, and each petal is spliced ​​into a whole ring. For example, each first rigid heat-insulating unit 110 has two petals along the annular direction of the elbow core tube 200, and each petal is a semi-annular shell structure. The two petals of each first rigid heat-insulating unit 110 are spliced ​​to form an annular seam, and each first rigid heat-insulating unit 110 is also spliced ​​with staggered seams along the annular direction of the elbow core tube 200. A soft buffer can also be provided in the annular seam, and the soft buffer is made of aerogel, and an adhesive can also be used in the annular seam to fill the gap outside the soft buffer and bond the two petals of the first rigid heat-insulating unit 110.

[0041] In some embodiments, see Figure 5 , Figure 5 It is a structural schematic diagram of another embodiment of the elbow insulation cover 100 provided by the utility model, wherein the elbow insulation cover 100 further comprises a soft insulation layer 121 and a second hard insulation layer 131, wherein the soft insulation layer 121 is radially located inside at least two first hard insulation layers 111, and the second hard insulation layer 131 is radially located outside at least two first hard insulation layers 111. The soft insulation layer 121 can effectively fill the gap between the first hard insulation layer 111 and the elbow core tube 200, so that the soft insulation layer 121 absorbs the deformation caused by the expansion of the elbow core tube 200, and reduces the collision between the elbow core tube 200 and the first hard insulation layer 111. The second hard insulation layer 131 can further increase the strength of the elbow insulation cover 100.

[0042] In some embodiments, the soft insulation layer 121 includes an aerogel insulation layer; and / or, the first hard insulation layer 111 includes a calcium silicate insulation layer; and / or, the second hard insulation layer 131 includes a polyurethane foam layer. Aerogel is an extremely excellent insulation material with a room temperature thermal conductivity of less than 0.022W / m·K and a low density, so the thickness of the insulation material can be greatly reduced to ensure the insulation performance. Aerogel preferably uses nano-scale aerogel. Calcium silicate is a white, hard insulation material with the characteristics of light bulk density, high strength, low thermal conductivity, high temperature resistance, corrosion resistance, and the ability to cut and saw. Polyurethane is a new type of synthetic material with waterproof and heat-insulating functions. It has a low thermal conductivity and good insulation effect. The polyurethane hard foam has good integrity and high compressive strength.

[0043] In some embodiments, refer again to Figure 5 , and combined with Figure 6 , Figure 6 yes Figure 1 Schematic diagram of the installation process of the insulation elbow assembly, the elbow insulation sleeve 100 includes a soft insulation unit 100a and a hard insulation structure 100b formed by a first hard insulation unit and a second hard insulation unit; the soft insulation unit 100a includes a soft insulation layer 121; the hard insulation structure 100b includes three hard splicing units distributed along the arc of the central axis R, the soft insulation unit 100a covers the three hard splicing units along the central axis R, and the three hard splicing units are a first section 110b, a tail section 130b and a middle section 120b connected between the first section 110b and the tail section 130b. The first section 110b and the tail section 130b both include a first hard insulation unit 110 and a second hard insulation unit distributed in sequence from the inside to the outside along the radial direction; the middle section 120b includes a second hard insulation unit and multiple first hard insulation units 110 distributed in sequence from the outside to the inside along the radial direction, and the second hard insulation unit of the middle section 120b covers multiple first hard insulation units 110. Exemplarily, the number of first hard insulation units 110 in the middle section 120b is three, but of course it can also be other numbers; wherein the first hard insulation unit 110 includes two layers of first hard insulation layer 111, and the second hard insulation unit includes a layer of second hard insulation layer 131.

[0044] The installation process of the elbow insulation cover of this embodiment is as follows Figure 6 As shown, it includes the following installation steps:

[0045] S10: Prefabrication in the factory, Figure 6 The upper middle part shows the prefabricated part, that is, the prefabricated part includes the elbow core tube 200, the soft insulation unit 100a and the middle section 120b of the hard insulation structure 100b.

[0046] S20: Lift the prefabricated components to the site.

[0047] S30: Install the first section 110b and the tail section 130b of the rigid thermal insulation structure 100b on site. Specifically, first install the first section 110b and the tail section 130b of the rigid thermal insulation unit 110, and then install the second rigid thermal insulation unit. Figure 6 The finished product is shown in the lower middle part.

[0048] In this embodiment, the rigid insulation structure 100b is formed by splicing three rigid splicing units. The middle section 120b of the three splicing units can be prefabricated in the factory together with the elbow core tube 200. The first section 110b and the tail section 130b are installed on site to the elbow core tube 200. The reason for adopting such an installation method is due to the need for on-site welding construction at both ends of the elbow core tube 200. In order to avoid the first section 110b and the tail section 130b affecting the on-site welding at both ends of the elbow core tube 200, the first section 110b and the tail section 130b are installed on site.

[0049] In some embodiments, the elbow insulation sleeve 100 further includes a heat reflecting layer, which is radially located between at least two first hard insulation layers 111 and a second hard insulation layer 131. The heat reflecting layer is used to reflect the heat of the first hard insulation layer 111, reduce heat radiation, and increase the insulation effect. At the same time, when the first hard insulation layer 111 is made of calcium silicate and the second hard insulation layer 131 is made of polyurethane, the heat reflecting layer can also prevent the polyurethane from entering the gap of the calcium silicate when the polyurethane is foamed. The heat reflecting layer can be made of aluminum foil.

[0050] In some embodiments, the elbow insulation sleeve 100 further includes an outer protective layer, which is radially located outside the second hard insulation layer 131. The outer protective layer includes a plurality of protective layer units distributed along the arc of the central axis R, and the male and female joints are used to connect the two adjacent protective layer units at the ends opposite to each other in the direction of the central axis R. Each protective layer unit can be formed by slicing the color steel plate. In order to ensure the firmness of the connection after the adjacent protective layer units are spliced, a mechanical bite can be used to achieve the connection.

[0051] In some embodiments, see Figure 7 , Figure 7 It is a structural schematic diagram of another embodiment of the thermal insulation elbow assembly provided by the utility model. The aforementioned thermal insulation elbow assembly also includes a fixing plate 300, which is fixed to the outer wall of the elbow core tube 200 and attached to the end face of the elbow thermal insulation sleeve 100 to limit the sliding of the elbow thermal insulation sleeve 100 relative to the elbow core tube 200 along the central axis R direction. The fixing plate 300 can prevent the elbow thermal insulation sleeve 100 from sliding relative to the elbow core tube 200, and can increase the safety of the thermal insulation elbow assembly during hoisting. The fixing plate 300 can be vertically welded to the outer wall of the elbow core tube 200.

[0052] The above are only embodiments of the present invention, and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the specification and drawings of the present invention, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. An elbow insulation cover, characterized in that: The elbow insulation sleeve is defined with a central axis, the elbow insulation sleeve extends along the central axis, and at least a portion of the central axis is an arc; The elbow insulation sleeve includes at least a plurality of first hard insulation units distributed along the arc of the central axis, each of the first hard insulation units includes at least two first hard insulation layers distributed along the radial direction perpendicular to the central axis, the first hard insulation layers of adjacent hard insulation units are correspondingly spliced ​​to form a longitudinal seam, and a soft buffer is arranged in the longitudinal seam, and an adhesive is used to fill the gap outside the soft buffer in the longitudinal seam and bond the adjacent first hard insulation layers.

2. The elbow insulation cover according to claim 1, characterized in that: The longitudinal seams of each layer are staggered along the central axis to form one of a male seam or a female seam at any one end of the first rigid thermal insulation unit along the central axis, and are used to realize male-female splicing with the female seam or male seam at the end of the adjacent first rigid thermal insulation unit.

3. The elbow insulation cover according to claim 1, characterized in that: The soft buffer is made of aerogel.

4. The elbow insulation cover according to claim 1, characterized in that: The elbow insulation sleeve also includes a soft insulation unit and a second hard insulation unit, the soft insulation unit includes a soft insulation layer, the second hard insulation unit includes a second hard insulation layer, the soft insulation layer is located on the inner side of the at least two first hard insulation layers in the radial direction, and the second hard insulation layer is located on the outer side of the at least two first hard insulation layers in the radial direction.

5. The elbow insulation cover according to claim 4, characterized in that: The first hard thermal insulation unit and the second hard thermal insulation unit form a hard thermal insulation structure; The rigid heat-insulating structure comprises three rigid splicing units distributed along the arc of the central axis, the soft heat-insulating unit covers the three rigid splicing units along the central axis, and the three rigid splicing units are respectively a first section, a tail section, and a middle section connected between the first section and the tail section; The first section and the tail section both include a first hard heat-insulating unit and a second hard heat-insulating unit sequentially distributed from inside to outside along the radial direction; The middle section includes a second hard heat-insulating unit and a plurality of the first hard heat-insulating units distributed in sequence from outside to inside along the radial direction, and the second hard heat-insulating unit in the middle section covers at least a plurality of the first hard heat-insulating units.

6. The elbow insulation cover according to claim 4 or 5, characterized in that: The soft thermal insulation layer comprises an aerogel thermal insulation layer; And / or, the first hard thermal insulation layer comprises a calcium silicate thermal insulation layer; And / or, the second hard thermal insulation layer includes a polyurethane foam layer.

7. The elbow insulation cover according to claim 4 or 5, characterized in that: The elbow insulation sleeve also includes a heat reflecting layer, and the heat reflecting layer is located between the at least two first hard insulation layers and the second hard insulation layer in the radial direction.

8. The elbow insulation cover according to claim 4 or 5, characterized in that: The elbow insulation sleeve also includes an outer protective layer, and the outer protective layer is located outside the second hard insulation layer in the radial direction; The outer protective layer includes a plurality of protective layer units distributed along the arc of the central axis, and two adjacent protective layer units are butt-jointed at opposite ends in the direction of the central axis using male and female joints.

9. A thermal insulation elbow assembly, characterized in that: It comprises an elbow core tube and an elbow insulation cover as described in any one of claims 1 to 5, wherein the elbow insulation cover wraps the elbow core tube.

10. The thermal insulation elbow assembly according to claim 9, characterized in that: The thermal insulation elbow assembly also includes a fixing plate, which is fixed to the outer wall of the elbow core tube and attached to the end surface of the elbow thermal insulation sleeve to limit the sliding of the elbow thermal insulation sleeve relative to the elbow core tube along the central axis direction.

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