Elbow heat preservation structure

Abstract

The invention relates to an elbow heat preservation structure which comprises a heat preservation pipe shell used for being arranged at an elbow pipeline in a sleeving mode, the heat preservation pipe shell is of a two-half structure and comprises a first half elbow pipe shell and a second half elbow pipe shell, and each of the first half elbow pipe shell and the second half elbow pipe shell comprises an elbow shell with the section of a semicircular structure; a plurality of shell partition plates are arranged on the inner wall of the elbow shell at intervals in the circumferential direction, each shell partition plate comprises a semi-cylinder base body fixedly attached to the inner wall of the elbow shell, a semi-annular plate is fixed to the inner wall of each semi-cylinder base body, an inner hole of each semi-annular plate is matched with the elbow pipeline, and a shell partition cavity with the large outer portion and the small inner portion is formed between every two adjacent shell partition plates. The shell separation cavity is filled with a heat preservation layer, and the heat preservation layer is provided with an arc-shaped groove used for containing the elbow pipeline. According to the elbow heat preservation structure, the structural strength and the heat preservation effect can be improved, so that the elbow heat preservation structure is suitable for an elbow pipeline with the large circumferential length.

Description

Technical Field

[0001] The invention relates to the technical field of pipeline insulation, and in particular to an elbow insulation structure. Background Art

[0002] In order to reduce the heat loss caused by the medium in the pipeline transferring heat to the outside, high-temperature pipelines are usually insulated. Straight pipe sections are easy to insulate, but elbows are labor-intensive and time-consuming due to the bends in the pipes. In addition, pipe elbows are often repaired and replaced, and it is extremely inconvenient to dismantle and replace traditional insulation structures.

[0003] Chinese patent CN216280103 U discloses "an insulation structure for an elbow", which includes an insulation pipe shell mounted on the elbow pipe, the insulation pipe shell is a two-half structure, namely a first half elbow shell and a second half elbow shell, the first half elbow shell and the second half elbow shell both include an elbow shell with a semicircular cross-section and an insulation layer arranged on the inner side of the shell, and an arc groove adapted to the elbow pipe is arranged in the insulation layer.

[0004] When in use, the first half elbow shell and the second half elbow shell are directly buckled onto the periphery of the elbow pipe, the elbow pipe is located in the arc groove, and then the first half elbow shell and the second half elbow shell are fixed. The existing elbow insulation structure has the following problems: the existing elbow insulation structure has limited strength and can only be applied to elbow pipes with small radius. The applicant encountered a long elbow pipe with a circumferential length of more than 1.5 meters, which is very easy to collapse and deform when applied to the current elbow insulation structure. In addition, the elbow insulation structure in the prior art is not easy to disassemble, which is not convenient for the inspection and maintenance of the elbow pipe. Summary of the invention

[0005] The object of the present invention is to provide an elbow insulation structure which can increase the structural strength and the thermal insulation effect and is suitable for an elbow pipe with a longer circumferential length.

[0006] In order to solve the above technical problems, a technical solution of an elbow insulation structure in the present invention is as follows: An elbow insulation structure comprises an insulation pipe shell for being sleeved on the elbow pipe, the insulation pipe shell is a two-half structure, namely a first half elbow pipe shell and a second half elbow pipe shell, the first half elbow pipe shell and the second half elbow pipe shell both comprise an elbow shell body with a semicircular cross-section, a plurality of shell partitions are arranged at intervals along the circumferential direction on the inner wall of the elbow shell, the shell partition comprises a semi-cylindrical base fixedly attached to the inner wall of the elbow shell, a semi-annular plate is fixed on the inner wall of the semi-cylindrical base, the inner hole of the semi-annular plate is adapted to the elbow pipe, a shell cavity with a larger outer portion and a smaller inner portion is formed between two adjacent shell partitions, the shell cavity is filled with an insulation layer, and the insulation layer has an arc groove for accommodating the elbow pipe.

[0007] Furthermore, the elbow shell is made of glass fiber reinforced plastic material.

[0008] Furthermore, the cross-sectional shape of the shell partition is T-shaped.

[0009] Furthermore, an upper connecting edge is provided at the bottom of the elbow shell of the first half-bend tube shell, and a lower connecting edge is provided at the top of the elbow shell of the second half-bend tube shell for use in conjunction with the upper connecting edge. A plurality of upper magnets arranged at circumferential intervals are provided on the upper connecting edge, and a plurality of lower magnets arranged at circumferential intervals are provided on the lower connecting edge. The positions of the lower magnets correspond to those of the upper magnets, and the upper magnets are used to be adsorbed and connected with the corresponding lower magnets.

[0010] Furthermore, the first half curved tube shell and the second half curved tube shell are fixed together by a plurality of stainless steel cable ties arranged at intervals along the circumferential direction.

[0011] Furthermore, the insulation layer in the corresponding shell compartment of the first half-bend shell is called the upper insulation layer, and the insulation layer in the corresponding shell compartment of the second half-bend tube body is called the lower insulation layer. The upper insulation layer has a bottom end surface for contacting and cooperating with the upper end of the lower insulation layer when in use, and the bottom end surface is divided into an outer bottom end surface located on the outside of the elbow pipe and an inner bottom end surface located on the inside of the elbow pipe.

[0012] Furthermore, a first protective film is provided at the bottom of the outer bottom end surface, and the first protective film is composed of a first left protective film and a first right protective film connected by a first tearing structure. The first tearing structure is provided along the radial extension of the elbow pipe, and the outer edges of the first left protective film and the first right protective film are connected to the elbow shell of the first half-bend shell through a second tearing structure.

[0013] Furthermore, the shell partition on the left side of the upper insulation layer is defined as the left shell partition, and the shell partition on the right side of the upper insulation layer is defined as the right shell partition. A left guide hole extending radially along the elbow pipe is provided on the left shell partition. A first outer control rod is provided in the left guide hole for guiding movement. The outer end of the first outer control rod has a first control rod guide matching section. The inner end of the left guide hole has a first guide hole matching section adapted to the first outer control rod guide matching section. The inner end of the first outer control rod extends into the inner hole of the corresponding semi-annular plate. The outer end of the first outer control rod A first outer control rod reset spring is connected, a left storage cavity is provided in the left shell partition, a left storage reel is provided in the left storage cavity, a left reel reset spring is connected to the left storage reel, the left end of the first left protective film passes through the first control rod guide matching section and the first guide hole matching section and is connected to the left storage reel, the first outer control rod is provided with a first control rod side groove on the outer side of the first control rod guide matching section, and the left guide hole is provided with a left guide hole matching groove used in conjunction with the first control rod side groove on the inner side of the first guide hole matching section.

[0014] Furthermore, a right-side guide hole extending radially along the elbow pipe is provided on the right-side shell partition, and a second outer control rod is assembled in the right-side guide hole for guiding movement, the outer end of the second outer control rod has a second control rod guide matching section, the inner end of the right-side guide hole has a second guide hole matching section adapted to the second outer control rod guide matching section, the inner end of the second outer control rod extends into the inner hole of the corresponding semi-annular plate, the outer end of the second outer control rod is connected to the second outer control rod reset spring, a right-side storage cavity is provided in the right-side shell partition, a right-side storage reel is provided in the right-side storage cavity, a right-side reel reset spring is connected to the right-side storage reel, the right end of the first right-side protective film passes through the second control rod guide matching section and the second guide hole matching section and is connected to the right-side storage reel, the second outer control rod has a second control rod side groove on the outside of the second control rod guide matching section, and the right-side guide hole has a right-side guide hole matching groove used in conjunction with the second control rod side groove on the inner side of the second guide hole matching section.

[0015] The beneficial effects of the present invention are as follows: in the present invention, the inner cavity of the elbow shell is divided into a plurality of shell compartments arranged in sequence along the circumference of the elbow shell by the shell partition, and the thermal insulation layer is arranged in the corresponding shell compartment. The arrangement of the shell partition can increase the structural strength of the elbow shell itself, avoid collapse and deformation of the elbow shell, ensure that the thermal insulation layer will not be deformed under pressure, ensure the thermal insulation effect, and improve the service life of the thermal insulation layer; at the same time, the shell partition can also weaken the flow of hot air between adjacent thermal insulation layers and reduce heat dissipation losses. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] By reading the following detailed description with reference to the accompanying drawings, the above and other objects, features and advantages of the exemplary embodiments of the present disclosure will become readily understood. In the accompanying drawings, several embodiments of the present disclosure are shown in an exemplary and non-limiting manner, and the same or corresponding reference numerals represent the same or corresponding parts, wherein: Figure 1 It is a structural schematic diagram of the first half-bend shell in Example 1 of an elbow insulation structure in the present invention; Figure 2 yes Figure 1 Usage status diagram; Figure 3 yes Figure 1 AA section view in the figure; Figure 4 It is a schematic structural diagram of the first half-bend shell in Example 2 of an elbow insulation structure in the present invention; Figure 5 yes Figure 4 The enlarged view of point B in the figure; 1. First half curved shell; 2. Insulation layer; 3. Upper magnet; 4. Upper connecting edge; 5. Shell partition; 5-1. Left shell partition; 5-2. Right shell partition; 6. Semi-cylinder base; 7. Semi-circular plate; 8. Inner hole of semi-circular plate; 9. Stainless steel tie; 10. Elbow pipe; 11. Elbow shell; 12. Second half curved shell; 13. Lower magnet; 14. First tear structure; 15. Second tear structure; 16. First left protective film; 1 7. First right side protective film; 18. Second left side protective film; 19. Second right side protective film; 20. First outer side control rod; 21. Second outer side control rod; 22. First inner side control rod; 23. Second inner side control rod; 24. Left side storage reel; 25. First outer side control rod return spring; 26. Left side guide hole; 27. Left side guide hole matching groove; 28. First control rod side groove; 29. ​​First outer side control rod guide matching section; 30. Arc groove. DETAILED DESCRIPTION

[0017] In order to facilitate the understanding of the present invention, the present invention is described in more detail below in conjunction with the accompanying drawings and specific embodiments. Preferred embodiments of the present invention are provided in the accompanying drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described in this specification. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosure of the present invention more thorough and comprehensive.

[0018] It should be noted that, unless otherwise defined, all technical and scientific terms used in this specification have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0019] Embodiment 1 of an elbow insulation structure of the present invention is as follows Figures 1 to 3 As shown: it includes an insulating pipe shell for being installed on the elbow pipe. The insulating pipe shell is a two-half structure, namely a first half-bend pipe shell 1 and a second half-bend pipe shell. The first half-bend pipe shell and the second half-bend pipe shell are symmetrically arranged up and down. Therefore, in this embodiment, only one of the half-bend pipe shells can be specifically introduced for the structure.

[0020] The first half-bend tube shell and the second half-bend tube shell both include an elbow shell 11 with a semicircular cross-section. A plurality of shell partitions 5 are circumferentially spaced apart on the inner wall of the elbow shell. The shell partitions include a semi-cylindrical base 6 fixedly attached to the inner wall of the elbow shell. The semi-cylindrical base is adhesively fixed to the inner wall of the elbow shell. A semi-annular plate 7 is fixed on the inner wall of the semi-cylindrical base. The inner hole of the semi-annular plate 7 is adapted to the elbow pipe 10. A shell compartment with a larger outer portion and a smaller inner portion is formed between two adjacent shell partitions. The shell compartment is filled with a thermal insulation layer 2, and the thermal insulation layer has an arc groove 30 for accommodating the elbow pipe.

[0021] In this embodiment, the elbow tube body is an elbow shell made of glass fiber reinforced plastic. The semi-annular plate is located in the middle of the semi-cylindrical base, so the cross-sectional shape of the shell partition is T-shaped, and the radius of the inner hole 8 of the semi-annular plate is consistent with the radius of the arc groove 30.

[0022] An upper connecting edge 4 is arranged at the bottom of the elbow shell of the first half elbow shell, and the upper connecting edge 4 is distributed on the inner and outer sides of the elbow pipe. A lower connecting edge used in conjunction with the upper connecting edge is arranged at the top of the elbow shell of the second half elbow shell, and a plurality of upper magnets 3 arranged at intervals along the circumferential direction are arranged on the upper connecting edge, and the upper magnets are distributed on the inner and outer sides of the elbow pipe. A plurality of lower magnets 13 arranged at intervals along the circumferential direction are arranged on the lower connecting edge, and the position of the lower magnet corresponds to the position of the upper magnet, and the upper magnet is used to be adsorbed and connected with the corresponding lower magnet.

[0023] The first half curved tube shell and the second half curved tube shell are fixed together by a plurality of stainless steel tie bands 9 arranged at intervals along the circumferential direction.

[0024] The "half" in this embodiment means that the circumferential angle of the cross-sectional direction of the corresponding component is 180°. The circumferential length of the first half curved tube shell in this embodiment is relatively long, not less than 1.5 meters, so it requires greater supporting strength.

[0025] When in use, the first half-bend tube shell and the second half-bend tube shell are directly aligned with the upper and lower sides of the elbow pipe 10, and the upper magnet is adsorbed and connected with the corresponding lower magnet to play a pre-fixing role, and then the first half-bend tube shell and the second half-bend tube shell are fixed together with a stainless steel tie.

[0026] The elbow shell made of fiberglass has good supporting strength. It is also corrosion-resistant, flame-retardant, not easy to deform, and beautiful in appearance. It can be disassembled and reused many times. The insulation layer is a soft aluminum silicate insulation layer. The shell partition not only supports the weight of the elbow shell, but also effectively prevents the insulation layer from being deformed by downward pressure, and the service life of the protective layer is longer. The setting of the shell partition can also weaken the flow of air between adjacent insulation layers and reduce heat dissipation losses. The cooperation of the upper magnet and the lower magnet can realize the accurate alignment of the first half of the elbow shell and the second half of the elbow shell, and then use stainless steel cable ties to tie them securely, so as to achieve rapid replacement and installation on site.

[0027] Embodiment 2 of an elbow insulation structure Figures 4 and 5 As shown: Example 2 is different from Example 1 in that in order to prevent the leakage position of the insulation layer from being worn during transportation, a corresponding protective film and a protective film storage structure are provided in the present invention. If the leakage position of the insulation layer is worn, after the first half-bend shell and the second half-bend tube body are buckled onto the periphery of the elbow pipe, the joint surfaces of the insulation layers of the first half-bend shell and the second half-bend tube body will be uneven, and gaps or pits will appear, which will affect the insulation effect.

[0028] In this embodiment, the insulation layer in the corresponding shell compartment of the first half-bend shell is called the upper insulation layer, and the insulation layer in the corresponding shell compartment of the second half-bend tube body is called the lower insulation layer. The upper insulation layer has a bottom end face for contacting and matching with the upper end of the lower insulation layer when in use, and the bottom end face is divided into an outer bottom end face located on the outside of the elbow pipe and an inner bottom end face located on the inside of the elbow pipe. The lower insulation layer has a top end face for contacting and matching with the bottom end face of the upper insulation layer. Since the first half-bend shell and the second half-bend tube body are upper and lower symmetrical structures, in this embodiment, the specific structure of the second half-bend tube body is not described in detail.

[0029] A first protective film is provided at the bottom of the outer bottom end surface, and the first protective film is composed of a first left protective film 16 and a first right protective film 17 connected by a first tearing structure 14. The first tearing structure 14 is provided to extend radially along the elbow pipe, and the outer edges of the first left protective film 16 and the first right protective film 17 are connected to the elbow shell of the first half-bend shell 1 through the second tearing structure 15. The first tearing structure is composed of a row of holes arranged at intervals along the radial direction of the elbow pipe, and the second tearing structure is composed of a row of holes arranged at intervals along the circumferential direction of the first half-bend shell. Due to the arrangement of the holes, the first tearing structure and the second tearing structure are relatively weak and easily torn.

[0030] Similarly, a second protective film is arranged on the inner bottom end face. The structure of the second protective film is similar to that of the first protective film and will not be described in detail here. The second protective film is composed of a second left protective film 18 and a second right protective film 19 arranged on the left and right. The second left protective film is connected to the second right protective film by a tearing structure, and the second protective film is connected to the elbow shell of the first half-bent shell by a tearing structure.

[0031] The shell partition corresponding to the left side of an upper insulation layer is defined as the left shell partition 5-1, and the shell partition corresponding to the right side of the upper insulation layer is defined as the right shell partition 5-2. A left guide hole 26 extending radially along the elbow pipe is provided on the left shell partition 5-1. A first outer control rod 20 is installed in the left guide hole 26 for guiding movement. The outer end of the first outer control rod 20 has a first outer control rod guide fitting section 29, and the inner end of the left guide hole 26 has a first guide hole fitting section adapted to the first outer control rod guide fitting section. The inner end of the first outer control rod extends into the inner hole of the corresponding semi-circular plate, and the outer end of the first outer control rod is connected to the first outer control rod reset spring 25. A left storage cavity is provided in the left shell partition, and a left storage reel 24 is provided in the left storage cavity. A left reel reset spring is connected to the left storage reel, and the left reel reset spring is a torsion spring (not shown in the figure). The left end of the first left protective film 16 passes through the first control rod guide matching section and the first guide hole matching section and is connected to the left storage reel 24. The side surface of the first outer control rod guide matching section has a friction surface for contacting the first left protective film. The first outer control rod has a first control rod side groove 28 on the outside of the first control rod guide matching section, and the left guide hole has a left guide hole matching groove 27 on the inside of the first guide hole matching section for use with the first control rod side groove. When the first control rod side groove 28 corresponds to the left guide hole matching groove 27, there is a gap between the first control rod side groove 28 and the left guide hole matching groove 27 for the first left protective film to pass through.

[0032] The right side shell partition is provided with a right guide hole extending radially along the elbow pipe, and the right side guide hole is provided with a second outer control rod for guiding and moving. The outer end of the second outer control rod has a second control rod guide matching section, and the inner end of the right guide hole has a second guide hole matching section adapted for the second outer control rod guide matching section, and the inner end of the second outer control rod extends into the inner hole of the corresponding semi-annular plate, and the outer end of the second outer control rod is connected with the second outer control rod reset spring, a right side storage cavity is provided in the right shell partition, a right side storage reel is provided in the right side storage cavity, and a right side reel reset spring is connected to the right side storage reel, the right end of the first right protective film passes through the second control rod guide matching section and the second guide hole matching section and is connected to the right side storage reel, the second outer control rod has a second control rod side groove on the outside of the second control rod guide matching section, and the right side guide hole has a right side guide hole matching groove used in conjunction with the second control rod side groove on the inner side of the second guide hole matching section. The cooperation between the right shell partition and the second outer control rod and the cooperation between the left shell partition and the first outer control rod are bilaterally symmetrical structures. Item 22 in the figure represents a first inner control rod for cooperating with the second left protective film, and item 23 represents a second inner control rod for cooperating with the second right protective film. The control mechanism thereof is similar to that of the first outer control rod and the first left protective film, and the second outer control rod 21 and the second left protective film, and will not be described in detail here.

[0033] During transportation, the first protective film covers the bottom of the corresponding upper insulation layer, the second protective film covers the top of the corresponding lower insulation layer, the left end of the first left protective film is fixed between the first outer control rod and the hole wall of the left guide hole; the right end of the first right protective film is fixed between the second outer control rod and the hole wall of the right guide hole, so as to avoid the wear and bump problems caused by leakage of the insulation layer during transportation. When it is used at the construction site, the first half elbow shell is buckled onto the outer periphery of the elbow pipe. During the buckling process, the elbow pipe squeezes the outer control rods and the inner control rods, and the control rods move toward the corresponding guide holes. Initially, the control rods are frictionally matched with the corresponding protective film, so the control rods can move the protective film toward the corresponding guide hole to pull the protective film, thereby tearing the corresponding tearing structure. When the control rod is retracted into the corresponding guide hole, the side groove of the control rod corresponds to the side groove of the guide hole. At this time, there is a large gap between the control rod and the guide hole, and the protective film can pass through the gap and be rolled up by the corresponding storage reel. If the tearing structure of the protective film is not torn smoothly, the staff can manually assist in the tearing, and no additional garbage will be generated after the protective film is successfully rolled up.

[0034] In the above description of this specification, unless otherwise clearly specified and limited, the terms "fixed", "installed", "connected" or "connected" should be understood in a broad sense. For example, with regard to the term "connection", it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be the internal connection of two elements or the interaction relationship between two elements. Therefore, unless otherwise clearly defined in this specification, those skilled in the art can understand the specific meanings of the above terms in the present invention according to the specific circumstances.

[0035] According to the above description of this specification, those skilled in the art may also understand that the terms used below, such as "up", "down", "front", "back", "left", "right", "length", "width", "thickness", "vertical", "horizontal", "top", "bottom", "inside", "outside", "axial", "radial", "circumferential", "center", "longitudinal", "lateral", "clockwise" or "counterclockwise", etc., which indicate the orientation or position relationship, are based on the orientation or position relationship shown in the drawings of this specification, and are only for the purpose of facilitating the explanation of the scheme of the present invention and simplifying the description, rather than explicitly or implicitly indicating that the device or element involved must have the specific orientation, be constructed and operate in a specific orientation. Therefore, the above-mentioned orientation or position relationship terms cannot be understood or interpreted as limitations on the scheme of the present invention.

[0036] In addition, the terms "first" or "second" used in this specification to refer to numbers or ordinals are only used for descriptive purposes and cannot be understood as explicitly or implicitly indicating relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of this specification, the meaning of "plurality" is at least two, such as two, three or more, etc., unless otherwise clearly and specifically defined.

[0037] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. An elbow insulation structure, comprising an insulation pipe shell for sleeved on an elbow pipe, the insulation pipe shell is a two-half structure, namely a first half elbow shell and a second half elbow shell, the first half elbow shell and the second half elbow shell both comprising an elbow shell with a semicircular cross-section, characterized in that: A plurality of shell partitions are arranged at intervals along the circumferential direction on the inner wall of the elbow shell, and the shell partitions include a semi-cylindrical base fixedly attached to the inner wall of the elbow shell, a semi-annular plate is fixed on the inner wall of the semi-cylindrical base, and the inner hole of the semi-annular plate is adapted to the elbow pipe. A shell cavity with a larger outer portion and a smaller inner portion is formed between two adjacent shell partitions, and the shell cavity is filled with a thermal insulation layer, and the thermal insulation layer has an arc-shaped groove for accommodating the elbow pipe.

2. The elbow insulation structure according to claim 1, characterized in that: The elbow shell is made of glass fiber reinforced plastic material.

3. The elbow insulation structure according to claim 1, characterized in that: The cross-sectional shape of the shell partition is T-shaped.

4. The elbow insulation structure according to claim 1, characterized in that: An upper connecting edge is arranged at the bottom of the elbow shell of the first half-bend tube shell, and a lower connecting edge used in conjunction with the upper connecting edge is arranged at the top of the elbow shell of the second half-bend tube shell. A plurality of upper magnets arranged at intervals along the circumferential direction are arranged on the upper connecting edge, and a plurality of lower magnets arranged at intervals along the circumferential direction are arranged on the lower connecting edge. The positions of the lower magnets correspond to the positions of the upper magnets, and the upper magnets are used to be adsorbed and connected with the corresponding lower magnets.

5. The elbow insulation structure according to claim 1, characterized in that: The first half curved tube shell and the second half curved tube shell are fixed together by a plurality of stainless steel cable ties arranged at intervals along the circumferential direction.

6. The elbow insulation structure according to any one of claims 1 to 5, characterized in that: The insulation layer in the corresponding shell compartment of the first half-bend shell is called the upper insulation layer, and the insulation layer in the corresponding shell compartment of the second half-bend tube body is called the lower insulation layer. The upper insulation layer has a bottom end surface for contacting and cooperating with the upper end of the lower insulation layer when in use. The bottom end surface is divided into an outer bottom end surface located on the outside of the elbow pipe and an inner bottom end surface located on the inside of the elbow pipe.

7. The elbow insulation structure according to claim 6, characterized in that: A first protective film is provided at the bottom of the outer bottom end surface, and the first protective film is composed of a first left protective film and a first right protective film connected by a first tearing structure. The first tearing structure is provided along the radial extension of the elbow pipe, and the outer edges of the first left protective film and the first right protective film are connected to the elbow shell of the first half-bend shell through a second tearing structure.

8. The elbow insulation structure according to claim 7, characterized in that: The shell partition on the left side of the upper insulation layer is defined as the left shell partition, and the shell partition on the right side of the upper insulation layer is defined as the right shell partition. A left guide hole extending radially along the elbow pipe is provided on the left shell partition. A first outer control rod is provided in the left guide hole for guiding movement. The outer end of the first outer control rod has a first control rod guide matching section. The inner end of the left guide hole has a first guide hole matching section adapted to the first outer control rod guide matching section. The inner end of the first outer control rod extends into the inner hole of the corresponding semi-circular plate. The outer end of the first outer control rod is connected to The first outer control rod reset spring, a left storage chamber is provided in the left shell partition, a left storage reel is provided in the left storage chamber, a left reel reset spring is connected to the left storage reel, the left end of the first left protective film passes through the first control rod guide matching section and the first guide hole matching section and is connected to the left storage reel, the first outer control rod is provided with a first control rod side groove on the outside of the first control rod guide matching section, and the left guide hole is provided with a left guide hole matching groove used in conjunction with the first control rod side groove on the inner side of the first guide hole matching section.

9. The elbow insulation structure according to claim 8, characterized in that: The right side shell partition is provided with a right guide hole extending radially along the elbow pipe, and the right side guide hole is provided with a second outer control rod for guiding and moving. The outer end of the second outer control rod has a second control rod guide matching section, and the inner end of the right guide hole has a second guide hole matching section adapted for the second outer control rod guide matching section, and the inner end of the second outer control rod extends into the inner hole of the corresponding semi-annular plate, and the outer end of the second outer control rod is connected with the second outer control rod reset spring, a right side storage cavity is provided in the right shell partition, a right side storage reel is provided in the right side storage cavity, and a right side reel reset spring is connected to the right side storage reel, the right end of the first right protective film passes through the second control rod guide matching section and the second guide hole matching section and is connected to the right side storage reel, the second outer control rod has a second control rod side groove on the outside of the second control rod guide matching section, and the right side guide hole has a right side guide hole matching groove used in conjunction with the second control rod side groove on the inner side of the second guide hole matching section.

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