A heat-insulating steel pipe elbow structure

Abstract

The application discloses a heat-preservation steel pipe elbow structure and relates to the technical field of heat-preservation steel pipe elbows, which comprises a steel pipe elbow body, wherein the steel pipe elbow body comprises an inner working pipe elbow, a heat-preservation layer and an outer protective pipe elbow which are distributed from inside to outside; three positioning support assembly are arranged on the inner working pipe elbow; three pouring holes are formed in the outer protective pipe elbow; the positioning support assembly comprises a hoop mounted on the inner working pipe elbow and a fixed support unit and a movable support unit arranged on the hoop. The advantages are as follows: during pipe penetrating operation, the movable support unit is avoided, and the inner working pipe elbow and the outer protective pipe elbow are facilitated to penetrate the pipe; during pouring operation, the concentricity of the inner working pipe elbow and the outer protective pipe elbow is adjusted by the movable support frame and the fixed support frame; the wavy state of the fixed support frame and the movable support frame reduces the contact area with the outer protective pipe elbow, increases the path length of heat conduction, is favorable for reducing the heat conduction amount and reducing the heat loss.

Description

Technical Field

[0001] This invention relates to the field of insulated steel pipe elbow technology, and in particular to an insulated steel pipe elbow structure. Background Technology

[0002] Insulated steel pipe elbows are prefabricated three-dimensional composite components. Common insulated steel elbows consist of three layers: an inner working pipe elbow, a middle insulation layer, and an outer protective layer elbow. The insulation layer is formed by injecting two liquid raw materials (combined polyether and isocyanate) mixed under high pressure between the assembled and positioned working pipe elbow and the outer protective layer elbow. The mixture is then foamed on-site through a chemical reaction. The insulation layer connects the working pipe elbow and the outer protective layer elbow into a complete and sturdy whole.

[0003] Before pipe insertion, circumferentially distributed positioning brackets are fixedly installed on the outer wall of the working pipe elbow. The working pipe elbow with the positioning brackets is then assembled with the outer sheath elbow through pipe insertion. However, in order to ensure the concentricity of the working pipe elbow and the outer sheath elbow and to make the thickness of the surrounding insulation layer uniform, the size of the area enclosed by the positioning brackets is usually equal to the inner diameter of the outer sheath elbow. Therefore, the positioning brackets will interfere with the working pipe elbow and the outer sheath elbow during pipe insertion, making pipe insertion difficult and even causing problems such as scratches on the inner wall of the outer sheath elbow and damage to the positioning bracket components. Secondly, the part of the positioning bracket that connects the working pipe elbow and the outer sheath elbow is usually made of nylon with a higher thermal conductivity than the insulation layer, and is designed in a block shape to ensure support strength. This provides a very low thermal resistance path for heat transfer, allowing heat to pass through the insulation layer efficiently, resulting in a "thermal bridge" effect, increasing overall heat loss and affecting the insulation effect.

[0004] Therefore, in order to facilitate smooth and rapid pipe installation and reduce heat loss, this invention provides an insulated steel pipe elbow structure. Summary of the Invention

[0005] The purpose of this invention is to solve the problems existing in the prior art and to propose a thermal insulation steel pipe elbow structure.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: a heat-insulated steel pipe elbow structure, comprising a steel pipe elbow body, wherein the steel pipe elbow body includes an inner working pipe elbow, a heat-insulating layer and an outer protective pipe elbow distributed from the inside out, the inner working pipe elbow is provided with three positioning bracket assemblies, and the outer protective pipe elbow is provided with three casting holes.

[0007] The positioning bracket assembly includes a clamp installed on the inner working pipe elbow and a fixed support unit and a movable support unit set on the clamp. The fixed support unit is provided with a wave-shaped fixed support frame, and the movable support unit is provided with a movable support frame. The fixed support frame and the movable support frame are used to extend the heat conduction path.

[0008] During pipe threading, the positioning bracket assembly is in threading mode, the fixed support frame provides two-point support, and the movable support unit retracts to avoid interference, allowing for seamless threading of the inner working pipe elbow and the outer protective pipe elbow. During pouring, the positioning bracket assembly is adjusted to pouring mode and operated from outside the pouring hole. The movable support unit extends and, together with the fixed support frame, forms three-point circumferential support, adjusting the concentricity of the inner working pipe elbow and the outer protective pipe elbow. After pouring, an insulation layer is formed, and the positioning bracket assembly is anchored in the insulation layer, ensuring that the inner working pipe elbow, the positioning bracket assembly, the insulation layer, and the outer protective pipe elbow are tightly integrated into a three-dimensional composite structure.

[0009] In the above-mentioned insulated steel pipe elbow structure, both the inner working pipe elbow and the outer protective pipe elbow are 90-degree elbows. The inner arc of the inner working pipe elbow and the outer protective pipe elbow has a starting point, a midpoint and a ending point distributed from left to right. The three casting holes are respectively opened at the starting point, midpoint and ending point of the outer protective pipe elbow.

[0010] In the above-mentioned insulated steel pipe elbow structure, three clamps are detachably installed on the elbow of the inner working pipe elbow. The three clamps are respectively installed at the starting point, midpoint and ending point of the inner working pipe elbow.

[0011] In the above-mentioned insulated steel pipe elbow structure, the clamp is provided with two fixed support units and one movable support unit. The two fixed support units and one movable support unit are distributed along the circumferential direction on the outer ring wall of the clamp, and the movable support unit corresponds to the pouring hole.

[0012] In the above-mentioned insulated steel pipe elbow structure, the fixed support unit consists of two fixed support frames and one fixed strip, and both the fixed strip and the fixed support frames are fixedly connected to the outer ring wall of the clamp.

[0013] In the above-mentioned insulated steel pipe elbow structure, the two fixed support frames are centrally symmetrically distributed with the fixed strip as the center.

[0014] In the above-mentioned insulated steel pipe elbow structure, the movable support unit includes a fixed seat that is fixedly connected to the outer ring wall of the clamp, and multiple through holes are opened through the side wall of the fixed seat.

[0015] In the above-mentioned insulated steel pipe elbow structure, a movable support frame is slidably connected inside the fixed seat, and multiple slide rails are provided on the inner wall of the fixed seat for the movable support frame to slide.

[0016] In the above-mentioned insulated steel pipe elbow structure, the outer ring wall of the clamp is rotatably connected to a screw rod, which is threadedly connected to the movable support frame.

[0017] In the above-mentioned insulated steel pipe elbow structure, a mating seat is fixedly connected to the top wall of the screw rod, and a mating groove is provided on the side of the mating seat away from the screw rod.

[0018] Compared with existing technologies, the advantages of this invention are as follows: 1. During pipe threading, the positioning bracket assembly is in pipe threading mode, the movable support unit avoids interference, the arc-shaped outer walls of the movable support frame and the fixed support frame are not on the same annular curved surface, and there is a gap between the inner ring wall of the outer protective pipe elbow and the movable support frame, reducing pipe threading interference. The outer protective pipe elbow can be easily fitted onto the outside of the inner working pipe elbow, fundamentally avoiding the risks of scratching the inner wall of the outer protective pipe elbow and damaging the positioning bracket assembly during pipe threading.

[0019] 2. During the pouring operation, the positioning bracket assembly is adjusted to the pouring mode. The movable support frame and the fixed support frame are adjusted to provide circumferential support between the inner ring wall of the outer protective pipe bend and the outer ring wall of the inner working pipe bend. The concentricity of the inner working pipe bend and the outer protective pipe bend is adjusted to facilitate the formation of a uniform annular space between the inner working pipe bend and the outer protective pipe bend, so as to ensure the uniform thickness of the subsequent insulation layer.

[0020] 3. After pouring, an insulation layer is formed. The positioning bracket assembly is anchored in the insulation layer. The inner working pipe elbow, positioning bracket assembly, insulation layer and outer protective pipe elbow are tightly combined into a three-dimensional composite structure. The wavy shape of the fixed support frame and movable support frame reduces the contact area with the outer protective pipe elbow, increases the heat conduction path length, and helps to reduce heat conduction and heat loss. Attached Figure Description

[0021] The specific embodiments of the present invention will be further described in detail below with reference to the accompanying drawings, wherein:

[0022] Figure 1 This is a schematic diagram of the overall structure.

[0023] Figure 2 This is a schematic diagram of the cross-sectional structure of the inner working pipe elbow and the outer protective pipe elbow.

[0024] Figure 3 This is a structural schematic diagram of the positioning bracket assembly.

[0025] Figure 4 This is a structural schematic diagram of a fixed support unit.

[0026] Figure 5 This is a schematic diagram of the structure before the movable support frame is moved upwards.

[0027] Figure 6 This is a schematic diagram of the structure after the movable support frame has been moved upwards.

[0028] Figure 7This is a schematic diagram of the structure of the inner working pipe elbow and the outer protective pipe elbow before concentric adjustment.

[0029] Figure 8 This is a schematic diagram of the structure of the inner working pipe elbow, insulation layer, and outer protective pipe elbow after the casting is completed.

[0030] In the diagram: 1. Main body of steel pipe elbow; 11. Inner working pipe elbow; 12. Insulation layer; 13. Outer protective pipe elbow; 2. Positioning bracket assembly; 21. Clamp; 22. Fixed support unit; 221. Fixing strip; 222. Fixed support frame; 23. Movable support unit; 231. Fixed seat; 232. Through hole; 233. Slide rail; 234. Movable support frame; 235. Screw rod; 236. Connecting seat; 3. Pouring hole. Detailed Implementation

[0031] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0032] Reference Figures 1 to 2 A thermally insulated steel pipe elbow structure includes a steel pipe elbow body 1. The steel pipe elbow body 1 includes an inner working pipe elbow 11, a thermal insulation layer 12, and an outer protective pipe elbow 13 distributed from the inside to the outside. The cross-sections of the inner working pipe elbow 11, the thermal insulation layer 12, and the outer protective pipe elbow 13 are all annular, and their diameters are arranged from small to large from the inside to the outside. Both the inner working pipe elbow 11 and the outer protective pipe elbow 13 are 90-degree elbows. Three positioning bracket assemblies 2 are provided on the inner working pipe elbow 11, and three casting holes 3 are opened on the outer protective pipe elbow 13. The inner arc of the inner working pipe elbow 11 and the outer protective pipe elbow 13 has a starting point, a midpoint, and a ending point distributed from left to right. The three casting holes 3 are respectively opened at the starting point, midpoint, and ending point of the outer protective pipe elbow 13.

[0033] For large insulated steel pipe elbows, the inner working pipe elbow 11 is used to withstand pressure and transport media, and is usually made of carbon steel using hot pushing and other processes; the outer protective pipe elbow 13 is used for waterproofing, moisture-proofing, and protection against mechanical damage, and is usually made of high-density polyethylene using molding processes; the annular space formed after the inner working pipe elbow 11 and the outer protective pipe elbow 13 pass through the pipe is used to pour the insulation layer 12. The insulation layer 12 is used for heat insulation and heat preservation and to reduce heat loss. It is usually made by mixing two liquid raw materials, polyether and isocyanate, under high pressure and then foaming them on-site through a chemical reaction. The inner working pipe elbow 11, the insulation layer 12, and the outer protective pipe elbow 13 form a whole.

[0034] The overall installation includes two steps: pipe threading and pouring. During pipe threading, the positioning bracket assembly 2 is first installed on the outer wall of the inner working pipe elbow 11. With the positioning bracket assembly 2 in threading mode, the outer protective pipe elbow 13 can be easily fitted onto the outside of the inner working pipe elbow 11. Then, a crane (not shown in the figure) and lifting cables (not shown in the figure) are used to lift the outer protective pipe elbow 13 and the inner working pipe elbow 11. During the pouring operation, the positioning bracket assembly 2 is adjusted to pouring mode, and the inner working pipe elbow 11 and the outer protective pipe elbow 13 are aligned concentrically, forming a uniform annular space between them. The ends of the inner working pipe elbow 11 and the outer protective pipe elbow 13 are sealed, and the insulation layer 12 is poured into the annular space through the pouring hole 3.

[0035] Reference Figures 2 to 3 The positioning bracket assembly 2 includes a clamp 21 installed on the inner working pipe elbow 11 and a fixed support unit 22 and a movable support unit 23 set on the clamp 21. The fixed support unit 22 and the movable support unit 23 cooperate to adjust the support range and extend the heat conduction path.

[0036] Reference Figures 2 to 3 Three clamps 21 are detachably installed on the elbow of the inner working pipe elbow 11. The three clamps 21 are respectively installed at the starting point, midpoint and ending point of the inner working pipe elbow 11. The clamp 21 includes a band set on the outer wall of the inner working pipe elbow 11 and connecting ears set at both ends of the band. The two connecting ears are fixedly connected by bolts and nuts. Two fixed support units 22 and one movable support unit 23 are provided on the clamp 21. The two fixed support units 22 and one movable support unit 23 are distributed along the circumferential direction on the outer ring wall of the clamp 21. The movable support unit 23 corresponds to the pouring hole 3.

[0037] Reference Figures 3 to 4 The fixed support unit 22 consists of two fixed support frames 222 and a fixed strip 221. The fixed strip 221 and the fixed support frames 222 are both fixedly connected to the outer ring wall of the clamp 21. The fixed support frames 222 are wavy, and the two fixed support frames 222 are centrally symmetrically distributed with the fixed strip 221 as the center. The two fixed support frames 222 are fixedly connected on the side that is close to each other by the corresponding fixed strip 221. The fixed strip 221 and the two fixed support frames 222 form an outward-opening U-shaped structure on the outer ring wall of the clamp 21. The outer wall of the end of the two fixed support frames 222 away from the clamp 21 is arc-shaped to match the inner wall of the outer protective pipe elbow 13.

[0038] Reference Figure 2 , Figure 3 , Figure 5 and Figure 6The movable support unit 23 includes a fixed seat 231 fixedly connected to the outer ring wall of the clamp 21. The fixed seat 231 is frame-shaped, and multiple through holes 232 are opened through the side wall of the fixed seat 231. A movable support frame 234 is slidably connected inside the fixed seat 231. Multiple slide rails 233 for sliding the movable support frame 234 are opened on the inner wall of the fixed seat 231. The movable support frame 234 consists of two brackets and one support. The brackets are wave-shaped, and the two brackets are centrally symmetrically distributed with the support as the center. The sides of the two brackets that are close to each other are fixedly connected through the corresponding supports. The support forms a U-shaped structure with an outward opening. The outer wall of the support away from the clamp 21 is arc-shaped to match the inner wall of the outer protective tube elbow 13. The distance between the two supports is greater than the diameter of the pouring hole 3. The outer ring wall of the clamp 21 is rotatably connected to a screw rod 235. The screw rod 235 is located at the center of the fixed seat 231 and is threaded to the middle of the support of the movable support frame 234. The top wall of the screw rod 235 is fixedly connected to a mating seat 236. The mating seat 236 has a mating groove on the side away from the screw rod 235. The diameter of the mating seat 236 is smaller than the diameter of the pouring hole 3.

[0039] During pipe threading operations, multiple positioning bracket assemblies 2 are first installed sequentially on the outer wall of the inner working pipe elbow 11. The specific operation is as follows: the clamp 21 is wrapped around the inner working pipe elbow 11, and bolts and nuts are used to fix the two connecting ears of the clamp 21. At this time, multiple movable support units 23 face directly upwards and correspond to the starting point, midpoint, and ending point of the inner arc of the inner working pipe elbow 11. Furthermore, the positioning bracket assembly 2 is in pipe threading mode (e.g., ...). Figure 5 , Figure 7 As shown), the support of the movable support frame 234 is close to the outer ring wall of the clamp 21, the movable support frame 234 is retracted into the interior of the fixed seat 231, and the top of the docking seat 236 is at the same height as the top of the movable support frame 234; the arc-shaped outer walls of the movable support frame 234 and the fixed support frame 222 are not on the same annular curved surface.

[0040] There is a gap between the inner ring wall of the outer protective pipe elbow 13 and the movable support frame 234. During pipe threading, the inner ring wall of the outer protective pipe elbow 13 will not be simultaneously restricted circumferentially by the two fixed support frames 222 and one movable support frame 234 on the same set of positioning bracket assembly 2, reducing pipe threading interference. The outer protective pipe elbow 13 can be easily fitted onto the outside of the inner working pipe elbow 11, fundamentally avoiding the risks of scratching the inner wall of the outer protective pipe elbow 13 and damaging the positioning bracket assembly 2 during pipe threading.

[0041] After the conduit is inserted, the lifting cable passes through the inside of the inner working pipe elbow 11 from left to right. The crane lifts the lifting cable vertically, raising the inner working pipe elbow 11. The inner working pipe elbow 11 then gently lifts the outer protective pipe elbow 13, which is connected to it. After being lifted, the inner working pipe elbow 11 and the outer protective pipe elbow 13 are at an angle. Figure 7 The outer protective pipe elbow 13 and the inner working pipe elbow 11 are not concentric. The arc point, midpoint, and terminal arc point on the inner arc of the inner working pipe elbow 11 correspond to the arc point, midpoint, and terminal arc point on the inner arc of the outer protective pipe elbow 13. The pouring hole 3 corresponds to the fixing seat 231. It should be noted that the part of the fixing seat 231 that contacts the inner wall of the outer protective pipe elbow 13 is chamfered to avoid scratching the inner wall of the outer protective pipe elbow 13.

[0042] During the pouring operation, the positioning bracket assembly 2 is adjusted to the pouring mode, and the inner working pipe elbow 11 and the outer protective pipe elbow 13 are aligned concentrically. The specific operation is as follows: Insert a screwdriver or electric screwdriver into the pouring hole 3 and align it with the mating groove on the mating seat 236. The mating groove is cross-shaped or slotted. Rotating the screwdriver causes the mating seat 236 to rotate, and the screw rod 235 rotates on the clamp 21. The movable support frame 234 then slides upward within the fixed seat 231. The support of the movable support frame 234 moves away from the outer ring wall of the clamp 21, and the movable support frame 234 extends beyond the interior of the fixed seat 231. The top height of the movable support frame 234 is higher than the height of the mating seat 236. The arc-shaped outer walls of the movable support frame 234 and the fixed support frame 222 are adjusted to the same annular curved surface. At this point, the positioning bracket assembly 2 has completed the adjustment of the pouring mode (e.g., Figure 6 (As shown).

[0043] During the adjustment process, the movable support frame 234 gradually lifts the outer protective pipe elbow 13 from the inner arc of the elbow. After the adjustment is completed (e.g. Figure 8 As shown, the movable support frame 234 and the fixed support frame 222 provide circumferential support between the inner ring wall of the outer protective pipe elbow 13 and the outer ring wall of the inner working pipe elbow 11. The inner working pipe elbow 11 and the outer protective pipe elbow 13 are adjusted to a concentric state, so as to form a uniform annular space between the inner working pipe elbow 11 and the outer protective pipe elbow 13, so as to ensure the uniform thickness of the subsequent insulation layer 12.

[0044] like Figure 1 and Figure 2 As shown, the two ends of the inner working pipe elbow 11 and the outer protective pipe elbow 13 are sealed. The inner working pipe elbow 11 and the outer protective pipe elbow 13 are sealed with a ring-shaped sealing plate and positioned by a clamp, so that the insulation layer 12 can form a ring with flat ends during subsequent pouring.

[0045] Then, two liquid raw materials, polyether and isocyanate, are poured into the annular space through the pouring hole 3, so that they are foamed and formed on site to fit the curved surface of the outer wall of the inner working pipe elbow 11 and the inner wall of the outer protective pipe elbow 13.

[0046] During the chemical foaming process, the foaming liquid material is injected into the annular space through three pouring holes 3, and enters the fixing seat 231 through the through hole 232, ensuring that the entire curved annular space and gaps are fully filled. The foaming liquid material can tightly wrap the positioning bracket assembly 2 to form a whole, which greatly enhances the structural rigidity and stability of the steel pipe elbow body 1. After the insulation layer 12 is formed, the clamps are removed and the sealing plate is taken off.

[0047] The fixing strip 221 and the two fixed support frames 222 form an outward-opening U-shaped structure on the outer ring wall of the clamp 21, providing two support zones in one direction to ensure the strength of the support. While ensuring structural strength, the wavy shape of the fixed support frame 222 and the movable support frame 234 reduces the contact area with the outer protective pipe bend 13, which helps reduce heat conduction. Furthermore, by increasing the length of the heat conduction path and utilizing the increased thermal resistance through the tortuous path, the "thermal bridge effect" can be significantly weakened, reducing heat loss.

[0048] In this invention, during pipe threading, the movable support unit 23 avoids obstruction, and the arc-shaped outer walls of the movable support frame 234 and the fixed support frame 222 are not on the same annular curved surface. There is a gap between the inner ring wall of the outer protective pipe elbow 13 and the movable support frame 234, and the inner working pipe elbow 11 and the outer protective pipe elbow 13 are threaded through. During the pouring operation, the movable support frame 234 and the fixed support frame 222 are adjusted to provide circumferential support between the inner ring wall of the outer protective pipe elbow 13 and the outer ring wall of the inner working pipe elbow 11, and the inner working pipe elbow 11 and the outer protective pipe elbow 13 are concentric. After pouring, an insulation layer 12 is formed, and the positioning bracket assembly 2 is anchored in the insulation layer 12. The wavy state of the fixed support frame 222 and the movable support frame 234 reduces the contact area with the outer protective pipe elbow 13, increases the path length of heat conduction, and helps to reduce heat conduction and heat loss.

[0049] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0050] Furthermore, the terms "first," "second," "number one," and "number two" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first," "second," "number one," or "number two" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0051] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0052] The embodiments described herein are preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Therefore, all equivalent changes made in accordance with the structure, shape, and principle of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A thermally insulated steel pipe elbow structure, comprising a steel pipe elbow body, characterized in that, The main body of the steel pipe elbow includes an inner working pipe elbow, an insulation layer and an outer protective pipe elbow distributed from the inside to the outside. The inner working pipe elbow is provided with three positioning bracket assemblies and the outer protective pipe elbow is provided with three casting holes. The positioning bracket assembly includes a clamp installed on the inner working pipe elbow and a fixed support unit and a movable support unit set on the clamp. The fixed support unit is provided with a wave-shaped fixed support frame, and the movable support unit is provided with a movable support frame. The fixed support frame and the movable support frame are used to extend the heat conduction path. During pipe threading, the positioning bracket assembly is in pipe threading mode, the fixed support frame provides two-point support, and the movable support unit retracts to avoid interference, allowing for non-interference pipe threading of the inner working pipe elbow and the outer protective pipe elbow; during pouring, the positioning bracket assembly is adjusted to pouring mode, operated from outside the pouring hole, adjusting the movable support unit to extend, forming a three-point circumferential support together with the fixed support frame, and adjusting the concentricity of the inner working pipe elbow and the outer protective pipe elbow; After pouring, an insulation layer is formed, and the positioning bracket assembly is anchored in the insulation layer, so that the inner working pipe elbow, the positioning bracket assembly, the insulation layer and the outer protective pipe elbow are tightly combined into a three-dimensional composite structure. The fixed support unit consists of two fixed support frames and one fixed bar; the two fixed support frames are centrally symmetrically distributed with the fixed bar as the center. The movable support unit includes a fixed seat fixedly connected to the outer ring wall of the clamp, and a movable support frame is slidably connected inside the fixed seat. The movable support frame consists of two brackets and one support, and the two brackets are centrally symmetrically distributed with the support as the center. Insert a screwdriver into the pouring hole and rotate it to rotate the screw rod on the clamp. The movable support frame then slides upward and extends out of the fixed seat. The top height of the movable support frame is higher than the height of the docking seat. The arc-shaped outer walls of the movable support frame and the fixed support frame are adjusted to the same annular curved surface. The movable support frame and the fixed support frame provide circumferential support between the inner annular wall of the outer protective pipe elbow and the outer annular wall of the inner working pipe elbow, adjusting the inner working pipe elbow and the outer protective pipe elbow to be concentrically distributed.

2. The insulated steel pipe elbow structure according to claim 1, characterized in that, Both the inner working pipe elbow and the outer protective pipe elbow are 90-degree elbows. The inner arc of the inner working pipe elbow and the outer protective pipe elbow has a starting point, a midpoint and a ending point distributed from left to right. The three casting holes are respectively opened at the starting point, midpoint and ending point of the outer protective pipe elbow.

3. The insulated steel pipe elbow structure according to claim 1, characterized in that, The inner working pipe elbow is detachably equipped with three clamps, which are respectively installed at the starting point, midpoint and ending point of the inner working pipe elbow.

4. The insulated steel pipe elbow structure according to claim 1, characterized in that, The clamp is provided with two fixed support units and one movable support unit. The two fixed support units and one movable support unit are distributed along the circumferential direction on the outer ring wall of the clamp, and the movable support unit corresponds to the pouring hole.

5. The insulated steel pipe elbow structure according to claim 1, characterized in that, Both the fixing strip and the fixing support frame are fixedly connected to the outer ring wall of the clamp.

6. The insulated steel pipe elbow structure according to claim 1, characterized in that, The side wall of the fixed base has multiple through holes.

7. The insulated steel pipe elbow structure according to claim 6, characterized in that, The inner wall of the fixed base is provided with multiple slide rails for the movable support frame to slide.

8. The insulated steel pipe elbow structure according to claim 1, characterized in that, The outer ring wall of the clamp is rotatably connected to a lead screw, which is threadedly connected to the movable support frame.

9. The insulated steel pipe elbow structure according to claim 8, characterized in that, The top wall of the lead screw is fixedly connected to a mating seat, and a mating groove is provided on the side of the mating seat away from the lead screw.

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