Steam turbine heat insulation sleeve based on multi-layer composite structure

Abstract

The invention relates to the technical field of heat insulation sleeves, and discloses a steam turbine heat insulation sleeve based on a multi-layer composite structure, the steam turbine heat insulation sleeve comprises an inner supporting layer, an outer supporting layer, a first baffle ring and a second baffle ring, the inner supporting layer and the outer supporting layer are each of a cylindrical structure, the inner supporting layer is arranged on the inner side of the outer supporting layer, and a gap is formed between the inner supporting layer and the outer supporting layer; through the arrangement of the inner supporting layer, the outer supporting layer and the filling cavity capable of being filled with heat insulation particles, the two ends of the filling cavity are sealed through the first baffle ring and the second baffle ring, and the technical problems that an existing heat insulation sleeve is uniform in heat insulation performance due to the fact that materials are fixed, and differential temperature requirements of different parts of a steam turbine cannot be met are solved; the heat insulation particles with the corresponding high-temperature-resistant characteristics are selected according to different temperature areas of the steam turbine, accurate adaptation of the heat insulation sleeve to all heating parts of the steam turbine is achieved, and the effects that the overall heat insulation efficiency is improved, and insufficient heat insulation of the high-temperature area and material waste of the low-temperature area are avoided are achieved.

Description

Technical Field

[0001] The invention relates to the technical field of thermal insulation sleeves, in particular to a steam turbine thermal insulation sleeve based on a multi-layer composite structure. Background Art

[0002] A steam turbine is a rotary power machine that converts steam's thermal energy into mechanical energy. It is widely used in fields such as electricity and marine engineering. Steam expands between blades, driving the rotor to rotate, thereby driving generators or other equipment. A thermal insulation sleeve is a protective device that provides thermal insulation and is often applied to the exterior of high-temperature equipment such as steam turbines. It reduces heat loss, lowers the ambient temperature, protects operators from burns, and improves equipment safety and energy efficiency.

[0003] Chinese patent CN102200213B discloses a removable, reusable, flexible sound and heat insulation sleeve comprising an inner layer and an outer layer. The sleeve is characterized by comprising at least one sound-absorbing layer, at least one heat-reflecting layer, and at least one damping sound-insulating layer located between the inner and outer layers. The inner, outer, sound-absorbing, heat-reflecting, and damping sound-insulating layers are all made of flexible materials and are connected. The inner layer is a high-temperature-resistant fabric and is adjacent to the sound-absorbing layer. The innermost heat-reflecting layer has its inner side adjacent to the sound-absorbing layer, while the innermost damping sound-insulating layer is located outside the heat-reflecting layer, with its inner side being a heat-reflecting surface. A connecting device is provided on at least one side of the outer layer. This invention provides both sound and heat insulation, occupies a small space, is thin, has a wide range of uses, is easy to assemble and disassemble, and has a long service life.

[0004] As shown in the aforementioned patent, existing thermal insulation sleeves generally adopt a multi-layer, integrated structural design with fixed materials for each layer. This directly results in uniform thermal insulation performance, making it impossible to tailor the insulation performance to actual usage requirements. Steam turbines are complex power equipment with significant temperature variations in different parts. For example, the piping system experiences a wide range of temperatures due to varying steam flow conditions. The main steam pipe is subjected to high-temperature, high-pressure steam at 400-566°C for long periods of time, while the reheat steam pipe experiences temperatures of approximately 300-538°C, and the low-pressure steam pipe can reach temperatures as low as 120-200°C. Around rotating components such as the bearing housing, temperatures fluctuate between 80-150°C due to frictional heat and residual steam heat. This multi-region, differentiated temperature distribution demands precise adaptation of the thermal insulation sleeve's performance. However, existing thermal insulation sleeves, due to their fixed materials and uniform performance, struggle to achieve targeted insulation in different areas. This results in either insufficient insulation in high-temperature areas or material waste in low-temperature areas, failing to balance adaptability and cost-effectiveness.

[0005] Therefore, it is necessary to provide a steam turbine thermal insulation sleeve based on a multi-layer composite structure to solve the above technical problems. Summary of the Invention

[0006] The purpose of the present invention is to provide a steam turbine thermal insulation sleeve based on a multi-layer composite structure, which solves the technical problem that the existing multi-layer integrated thermal insulation sleeve has uniform thermal insulation performance due to fixed material and cannot adapt to the differentiated temperature requirements of different parts of the steam turbine.

[0007] The above technical purpose of the present invention is achieved through the following technical solutions: a steam turbine thermal insulation sleeve based on a multi-layer composite structure, including an inner support layer, an outer support layer, a retaining ring one and a retaining ring two, the inner support layer and the outer support layer are both cylindrical structures, and the inner support layer is arranged on the inner side of the outer support layer, a gap is arranged between the inner support layer and the outer support layer, retaining ring one and retaining ring two are both arranged between the inner support layer and the outer support layer and close the two ends of the gap, a filling cavity is formed between the support layer, the outer support layer, retaining ring one and retaining ring two, and the filling cavity is filled with thermal insulation particles.

[0008] The present invention is further configured as follows: a plurality of partitions are equidistantly arranged between the outer supporting layer and the inner supporting layer, and the partitions divide the filling cavity formed between the inner supporting layer, the outer supporting layer, the first retaining ring and the second retaining ring into a plurality of mutually unconnected chambers.

[0009] The present invention is further configured as follows: a plurality of outer slots are evenly distributed on the inner side of the outer supporting layer; a plurality of inner slots are evenly distributed on the outer side of the inner supporting layer; and the partition is inserted between the inner slots and the outer slots.

[0010] The present invention is further configured as follows: the steam turbine thermal insulation sleeve based on the multi-layer composite structure further includes a plurality of connecting rings, and the plurality of inner supporting layers and outer supporting layers are connected by the connecting rings.

[0011] The present invention is further configured as follows: an inner annular groove and an outer annular groove are provided on both sides of the connecting ring, the two ends of the inner supporting layer are inserted into the inner annular groove, and the two ends of the outer supporting layer are inserted into the outer annular groove.

[0012] The present invention is further configured as follows: the connecting ring includes an outer support ring, an inner support ring, an annular fixing bag and a connecting tube, the annular fixing bag is fixedly arranged between the outer support ring and the inner support ring, and multiple connecting tubes are provided, one end of the connecting tube is fixedly connected to the outer support ring, and the other end of the connecting tube is fixedly connected to the inner support ring, the connecting tube passes through the annular fixing bag, the outer annular groove is arranged between the annular fixing bag and the outer support ring, and the inner annular groove is arranged between the annular fixing bag and the inner support ring.

[0013] The present invention is further configured as follows: a plurality of fixing components are provided on the connecting ring, the fixing components are used to fix the connecting ring on the turbine pipeline, and the plurality of fixing components are distributed in a circular array with the axis of the connecting ring as the array center.

[0014] The present invention is further configured as follows: the fixing assembly includes a screw, a mounting seat and a rubber pad, the screw passes through the connecting tube, and the screw is threadedly connected to the connecting tube, a knob is fixedly installed on the end of the screw away from the inner support ring, a mounting seat is rotatably installed on the end of the screw away from the knob, a rubber pad is fixedly installed on the side of the mounting seat away from the screw, a guide column is fixedly installed on the mounting seat, the guide column passes through the inner support ring, and the guide column and the inner support ring are slidably fitted.

[0015] The present invention is further configured as follows: the rubber pad is a hollow structure, an infusion channel is opened inside the guide column, one end of the guide column away from the mounting seat extends into the interior of the annular fixing bag, two ends of the infusion channel are respectively connected to the rubber pad and the annular fixing bag, the infusion channel, the rubber pad and the annular fixing bag are all filled with oil, one end of the guide column extending into the annular fixing bag is fixedly installed with a mounting ring, a bellows is sleeved on the guide column, one end of the bellows is fixedly connected to the mounting ring, the other end of the bellows is fixedly connected to the inner circumferential wall of the annular fixing bag, and the guide column and the annular fixing bag are movably coordinated.

[0016] The present invention is further configured as follows: a plurality of feed holes are provided on the retaining ring; when installed, particles are injected into the filling cavity through the feed holes.

[0017] In summary, the present invention has the following beneficial effects: the present invention solves the technical problem that the existing thermal insulation sleeve has uniform thermal insulation performance and cannot adapt to the differentiated temperature requirements of different parts of the steam turbine due to the fixed material, by setting the inner supporting layer, the outer supporting layer and the filling cavity that can be filled with thermal insulation particles, and cooperating with the blocking rings 1 and 2 to seal the two ends of the filling cavity. By selecting thermal insulation particles with corresponding high-temperature resistant characteristics according to different temperature zones of the steam turbine, the thermal insulation sleeve is accurately adapted to the various heating parts of the steam turbine, thereby achieving the effect of improving the overall thermal insulation efficiency, avoiding insufficient thermal insulation in high-temperature areas and waste of materials in low-temperature areas; by cooperating with the partition plate and the inner and outer slots, the filling cavity is divided into a plurality of mutually unconnected chambers, thereby solving the technical problem that the thermal insulation particles flow in the filling cavity, resulting in uneven distribution and affecting the thermal insulation effect; In addition, through the linkage design of the connecting ring and the fixing component, the inner support layer, the outer support layer and the connecting ring are clamped and fixed by utilizing the transfer of oil to the annular fixing bag when the rubber pad is compressed, thereby solving the technical problems of cumbersome splicing and installation of the insulation sleeve and insufficient fixing stability, and realizing flexible adjustment of the length of the insulation sleeve and rapid and stable installation, thereby achieving the effect of reducing transportation costs, improving installation convenience and structural stability, and at the same time achieving the effect of reducing local maintenance costs and working hours through the replaceability of the insulation particles. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention; Figure 2It is a schematic diagram of the three-dimensional structure when multiple thermal insulation sleeves of the present invention are connected; Figure 3 It is a structural schematic diagram of the connecting ring of the present invention; Figure 4 It is a schematic diagram of the side cross-sectional structure of the present invention; Figure 5 for Figure 4 A schematic diagram of the enlarged structure at point A; Figure 6 Schematic diagram of the structure of the inner support layer, outer support layer, retaining ring 1 and retaining ring 2 of the present invention; Figure 7 This is a schematic structural diagram of the inner support layer of the present invention when it is unfolded; Figure 8 Schematic diagram of the cross-sectional structure of the connecting ring of the present invention; Figure 9 for Figure 8 A schematic diagram of the enlarged structure at point B; Figure 10 It is a structural schematic diagram of the fixing assembly of the present invention.

[0019] In the figure: 1. Inner support layer; 101. Inner slot; 2. Outer support layer; 201. Outer slot; 3. Insulating particles; 4. Partition; 5. Baffle ring 1; 501. Feed hole; 6. Baffle ring 2; 7. Connecting ring; 701. Outer support ring; 702. Inner support ring; 703. Annular fixing bag; 704. Outer annular groove; 705. Inner annular groove; 706. Connecting tube; 8. Screw; 9. Knob; 10. Mounting seat; 11. Rubber pad; 12. Guide column; 13. Mounting ring; 14. Bellows. DETAILED DESCRIPTION

[0020] The present invention will be further described below with reference to the accompanying drawings in the embodiments of the present invention.

[0021] See also Figures 1 to 7 In an embodiment of the present invention, a steam turbine thermal insulation sleeve based on a multi-layer composite structure includes an inner support layer 1, an outer support layer 2, a first retaining ring 5, and a second retaining ring 6. The inner support layer 1 and the outer support layer 2 are both cylindrical structures, and the inner support layer 1 is arranged on the inner side of the outer support layer 2. A gap is provided between the inner support layer 1 and the outer support layer 2. The first retaining ring 5 and the second retaining ring 6 are both arranged between the inner support layer 1 and the outer support layer 2 and close both ends of the gap. A filling cavity is formed between the support layer, the outer support layer 2, the first retaining ring 5, and the second retaining ring 6. The filling cavity is filled with thermal insulation particles 3. It should be noted that the retaining ring 1 5 and the retaining ring 2 6 are made of hard insulation material, and cordierite-mullite ceramics can be selected, which has excellent high temperature resistance, long-term use temperature ≤1200℃, low thermal expansion coefficient, strong thermal shock resistance, and can withstand temperature fluctuations in high-temperature areas such as the main steam pipe and high-pressure cylinder of the steam turbine. It has high hardness and is not easy to deform, and can effectively seal both ends of the filling cavity to prevent leakage of the insulation particles 3; silicon carbide ceramics can also be selected, with a long-term use temperature ≤1600℃ and excellent corrosion resistance. It is suitable for the areas around the reheat steam pipe in the steam turbine that are in contact with steam and may have trace corrosive media. Maintain structural stability for a long time; high-temperature resistant resin-based composite ceramics can also be used. This material is made of phenolic resin as the matrix and mixed ceramic powder. The long-term use temperature is ≤600℃. It has certain toughness and better impact resistance than pure ceramics. It is suitable for medium and low temperature areas such as low-pressure cylinders and bearing boxes of steam turbines. It is not easy to break due to vibration or collision during installation; the thermal insulation particles 3 are made of thermal insulation materials. The thermal insulation particles 3 have elasticity to reduce the gap between the thermal insulation particles 3 when filling. Elastic ceramic fiber particles can be selected. They are cut into 3-5mm short particles by alumina-silica ceramic fibers. They have certain elasticity and compression rebound rate ≥ 80%, can fill the gap by its own deformation during filling, thermal conductivity is as low as 0.03 ~ 0.05W / (m・K), long-term use temperature ≤1000℃, suitable for high temperature areas such as main steam pipeline of steam turbine (400 ~ 566℃), high pressure cylinder (350 ~ 500℃); expanded vermiculite modified particles can also be used. The particles are treated with organic silicon coating on natural expanded vermiculite, retaining the high temperature resistance of long-term use temperature ≤800℃, while increasing elasticity, with a bulk density of 120 ~ 150kg / m³ and can rebound after compression, with a thermal conductivity of 0.04 ~ 0.06W / (m・K ), suitable for medium-temperature areas such as reheat steam pipelines (300-538°C) and medium-pressure cylinders (250-400°C), and its improved resistance to moisture absorption can prevent the thermal insulation effect from being affected by steam condensation; glass microsphere-elastic resin composite particles can also be used. It uses hollow glass microspheres with a thermal conductivity of 0.02-0.04W / (m・K) as the core and is covered with a silicone rubber elastic layer. It has excellent elasticity and a tensile rebound rate of ≥90%. It is resistant to high temperatures of ≤300°C and is suitable for low-temperature areas such as low-pressure steam pipelines (120-200°C) and bearing boxes (80-150°C). It can be tightly fitted during filling to reduce the gap between particles; The present invention divides the thermal insulation sleeve into an inner support layer 1, an outer support layer 2 and thermal insulation particles 3 to form a three-layer structure. The outer support layer 2 and the inner support layer 1 play a supporting role and are made of a flexible thermal insulation material. The setting of the retaining ring 1 5 and the retaining ring 2 6 forms a filling cavity. In the filling cavity, thermal insulation particles 3 of different materials can be selected according to the thermal insulation requirements (for example, for different temperature zones of the steam turbine, the selection of thermal insulation particles 3 needs to be precisely adapted: for ultra-high temperature zones (400-566°C, such as main steam pipes and high-pressure cylinders), elastic ceramic fiber particles (high temperature resistance ≤1000°C) or high-purity alumina ceramic particles (thermal conductivity 0.03-0.07W / (m·K), high temperature resistance ≤1200°C) are preferably selected to ensure that they will not soften or deform under long-term high temperature; for medium temperature zones (200-400°C, such as reheat steam pipes and medium-pressure cylinders), expanded vermiculite modified particles (high temperature resistance ≤800°C) or ceramic-glass composite particles (thermal conductivity 0.02 5-0.04W / (m·K), high temperature resistance ≤800°C), balancing thermal insulation and cost. For low-temperature areas (50-200°C, such as low-pressure cylinders and bearing housings), glass microsphere-elastic resin composite particles or expanded perlite coated with an anti-hygroscopic coating (thermal conductivity 0.025-0.045W / (m·K)) are selected to achieve both lightweight and elastic cushioning. The gaps between the thermal insulation particles 3 form an elastic buffer layer. When the insulation sleeve is subjected to vibration or impact, the thermal insulation particles 3 absorb energy through relative displacement, reducing stress transfer to the inner and outer layers and the insulated object. At the same time, the free space between the particles can alleviate the thermal expansion and contraction stresses caused by temperature changes, reducing the risk of deformation and cracking of the insulation sleeve. Because the thermal insulation particles 3 are replaceable, if local particles age due to high temperature, corrosion, or other factors, only the thermal insulation particles 3 in the damaged area need to be replenished or replaced, without replacing the inner and outer support layers 1 and 2, significantly reducing maintenance costs and labor.

[0022] In this embodiment, preferably, a plurality of partitions 4 are equidistantly arranged between the outer supporting layer 2 and the inner supporting layer 1, and the partitions 4 divide the filling cavity formed between the inner supporting layer 1, the outer supporting layer 2, the baffle ring 1 5 and the baffle ring 2 6 into a plurality of mutually unconnected cavities; a plurality of outer slots 201 are equidistantly distributed on the inner side of the outer supporting layer 2, and a plurality of inner slots 101 are equidistantly distributed on the outer side of the inner supporting layer 1, and the partitions 4 are inserted between the inner slots 101 and the outer slots 201; the partitions 4 are made of hard heat-insulating material (the material selection of the partitions 4 is based on the principle of compatibility with the baffle ring material. If the partitions 4 are used in high-temperature areas such as the filling cavity of the main steam pipe section, the same cordierite-mullite ceramics or silicon carbide ceramics as the baffle rings can be used to reduce the difference in thermal expansion coefficients and avoid particle leakage in the gap due to temperature changes). ; If the partition 4 is used in medium and low temperature areas such as low-pressure cylinder sections, high-temperature resistant calcium silicate board can be selected). During installation, after the cylindrical outer support layer 2 is placed on the outside of the inner support layer 1, the outer support layer 2 is rotated to adjust the angle so that the inner slot 101 and the outer slot 201 are set relative to each other, and then the partition 4 is inserted between the inner slot 101 and the outer slot 201, so that the partition 4 divides the filling cavity formed between the inner support layer 1, the outer support layer 2, the retaining ring 1 5 and the retaining ring 2 6 into multiple unconnected chambers, so that the insulation particles 3 will not flow between the chambers, and the insulation particles 3 are evenly distributed in the chambers to ensure the insulation effect. In addition, the partition 4 cooperates with the setting of the inner slot 101 and the outer slot 201, so that the outer support layer 2 cannot rotate relative to the inner support layer 1, thereby ensuring the stability of the structure.

[0023] In this embodiment, preferably, the outer supporting layer 2 and the inner supporting layer 1 are both made of a strip structure wound into a cylindrical shape, and the two ends of the outer supporting layer 2 and the inner supporting layer 1 are bonded together by glue. The glue can be organic silicone high-temperature resistant glue (such as DowCorning734), which has a bonding strength of ≥2MPa, high temperature resistance ≤300℃, and a certain elasticity. It is suitable for bonding the support layer with the retaining ring and the connecting ring 7 in medium and low temperature areas such as low-pressure cylinders and bearing box sections, and is resistant to steam corrosion; ceramic-based high-temperature glue (such as Beijing Tianshan TS806) can also be used. The glue uses ceramic powder as filler, has high temperature resistance ≤1200℃, and bonding strength ≥3MPa. It is suitable for high-temperature areas such as main steam pipes and high-pressure cylinder sections. After curing, it is resistant to impact and thermal shock. The outer supporting layer 2 and the inner supporting layer 1 need to have bendability and flexible thermal insulation. Silicone rubber glass fiber cloth can be used, and its base material is glass fiber with a temperature resistance of ≤550℃. The fiber cloth is coated with silicone rubber with a temperature resistance of ≤300°C, has a thickness of 0.3-0.5mm, a bending radius of ≤50mm, and has both thermal insulation and wear resistance with a thermal conductivity of 0.035-0.05W / (m·K), making it suitable for medium and low temperature areas. Alternatively, a flexible ceramic fiber cloth can be used. It is woven from alumina-silicon dioxide ceramic fibers, has a temperature resistance of ≤1200°C, a bending radius of ≤30mm, a thickness of 0.5-1mm, and a thermal conductivity of 0.03-0.05W / (m·K), making it suitable for high-temperature areas such as main steam pipelines and high-pressure cylinder sections, and is resistant to aging and steam erosion). Through the arrangement of this embodiment, the outer support layer 2 and the inner support layer 1 can be cut and produced at the installation site, and the raw materials of the strip-shaped outer support layer 2 and the inner support layer 1 can be wound together, occupying less space. Therefore, there is no need to transport the cylindrical inner support layer 1 and the outer support layer 2, thereby improving the convenience of transportation.

[0024] In this embodiment, preferably, a plurality of feed holes 501 are provided on the baffle ring 1 5. When the baffle ring 1 5 and the baffle ring 2 6 are installed, the baffle ring 1 5 and the baffle ring 2 6 are bonded to the outer support layer 2 and the inner support layer 1, and the heat insulation particles 3 are injected into the filling cavity through the feed holes 501. After the heat insulation particles 3 are filled, an inert gas with good heat insulation properties is filled into the heat insulation cavity to further improve the heat insulation effect. After the filling is completed, the feed holes 501 are closed.

[0025] See also Figure 3 and Figures 8 to 10 In an embodiment of the present invention, the steam turbine thermal insulation sleeve based on the multi-layer composite structure further includes a plurality of connecting rings 7, and a plurality of inner supporting layers 1 and outer supporting layers 2 are connected by the connecting rings 7, so that the thermal insulation sleeve can be spliced ​​into different lengths according to usage requirements to adapt to steam turbine pipes of different lengths; an inner annular groove 705 and an outer annular groove 704 are provided on both sides of the connecting ring 7, and the two ends of the inner supporting layer 1 are inserted into the inner annular groove 705, and the two ends of the outer supporting layer 2 are inserted into the outer annular groove 704, so that the outer supporting layer 2 and the inner supporting layer 1 are plugged into the connecting ring 7.

[0026] In this embodiment, preferably, the connecting ring 7 includes an outer support ring 701, an inner support ring 702, an annular fixing capsule 703 and a connecting tube 706, the annular fixing capsule 703 is fixedly arranged between the outer support ring 701 and the inner support ring 702, and the connecting tube 706 is provided with multiple, one end of the connecting tube 706 is fixedly connected to the outer support ring 701, and the other end of the connecting tube 706 is fixedly connected to the inner support ring 702, the connecting tube 706 passes through the annular fixing capsule 703, the outer annular groove 704 is arranged between the annular fixing capsule 703 and the outer support ring 701, and the inner annular groove 705 is arranged Between the annular fixing bag 703 and the inner support ring 702; the two ends of the connecting tube 706 are fixedly connected to the inner circumferential wall and the outer circumferential wall of the annular fixing bag 703 respectively. The annular fixing bag 703 is a hollow structure and has elasticity. When oil is input into the annular fixing bag 703, the annular fixing bag 703 expands to reduce the thickness of the inner annular groove 705 and the outer annular groove 704, thereby clamping the inner support layer 1 and the outer support layer 2 inserted into the inner annular groove 705 and the outer annular groove 704, thereby fixing the two ends of the inner support layer 1 and the outer support layer 2 to connect the connecting ring 7 with the outer support layer 2 and the inner support layer 1.

[0027] In this embodiment, preferably, a plurality of fixing components are provided on the connecting ring 7, and the fixing components are used to fix the connecting ring 7 on the turbine pipeline. The plurality of fixing components are distributed in a circular array with the axis of the connecting ring 7 as the array center; the number of fixing components is the same as the number of the connecting cylinder 706, and the fixing component includes a screw 8, a mounting seat 10 and a rubber pad 11. The screw 8 passes through the connecting cylinder 706, and the screw 8 is threadedly connected to the connecting cylinder 706. The end of the screw 8 away from the inner support ring 702 is fixedly installed with a knob 9, and the end of the screw 8 away from the knob 9 is rotatably installed with a mounting seat 10, and the side of the mounting seat 10 away from the screw 8 is fixedly installed with a rubber pad 11. A guide post 12 is fixedly mounted on the mounting seat 10, and the guide post 12 passes through the inner support ring 702, and the guide post 12 and the inner support ring 702 are slidably matched; the rubber pad 11 is a hollow structure, and an infusion channel is opened inside the guide post 12. The end of the guide post 12 away from the mounting seat 10 extends into the interior of the annular fixing bag 703, and the two ends of the infusion channel are respectively connected to the rubber pad 11 and the annular fixing bag 703. The infusion channel, the rubber pad 11 and the annular fixing bag 703 are all filled with oil. The end of the guide post 12 extending into the annular fixing bag 703 is fixedly mounted with a mounting ring 13, and a bellows 14 is sleeved on the guide post 12, and one end of the bellows 14 is fixed to the mounting ring 13 The other end of the bellows 14 is fixedly connected to the inner circumferential wall of the annular fixing bag 703, and the guide column 12 is movably matched with the annular fixing bag 703; when fixing the connecting ring 7 on the turbine pipe through the fixing assembly, first put the connecting ring 7 on the turbine pipe, and then rotate the screw 8 through the knob 9 to make the mounting seat 10 drive the rubber pad 11 to move toward the turbine pipe. When the rubber pad 11 is pressed on the turbine pipe, the connecting ring 7 can be initially fixed on the turbine pipe, and then the inner support layer 1, the outer support layer 2, the retaining ring 1 5 and the retaining ring 2 6 are installed and filled with thermal insulation particles 3, and then the knob 9 is continued to be tightened to make the rubber pad 11 continue to be compressed to improve the firmness of the fixation. At the same time, When the rubber pad 11 is compressed, the oil in the rubber pad 11 enters the annular fixing bag 703 through the oil delivery channel opened in the guide column 12, causing the annular fixing bag 703 to expand. The expansion of the annular fixing bag 703 reduces the thickness of the inner annular groove 705 and the outer annular groove 704, thereby clamping the inner supporting layer 1 and the outer supporting layer 2 inserted into the inner annular groove 705 and the outer annular groove 704, thereby fixing the two ends of the inner supporting layer 1 and the outer supporting layer 2, so as to connect the connecting ring 7 with the outer supporting layer 2 and the inner supporting layer 1. While fixing the connecting ring 7 to the turbine pipeline, the outer supporting layer 2 and the inner supporting layer 1 can be fixed by utilizing the transfer of oil, thereby improving the convenience of installation;The guide post 12 not only guides the movement of the mounting base 10 but also provides a channel for oil delivery. The bellows 14 seals the gap between the guide post 12 and the annular retaining bladder 703 to prevent oil leakage. It should be noted that after the thermal insulation sleeve is installed, the gaps at both ends of the thermal insulation sleeve need to be sealed with thermal insulation material. The specific sealing method is conventional and will not be described in detail here.

[0028] The above description is only a preferred embodiment of the present invention. Therefore, any equivalent changes or modifications made according to the structure, characteristics and principles described in the scope of the patent application of the present invention are included in the scope of the patent application of the present invention.

Claims

1. A steam turbine thermal insulation sleeve based on a multi-layer composite structure, comprising an inner support layer (1), an outer support layer (2), a first retaining ring (5) and a second retaining ring (6), characterized in that: The inner supporting layer (1) and the outer supporting layer (2) are both cylindrical structures, and the inner supporting layer (1) is arranged on the inner side of the outer supporting layer (2), a gap is provided between the inner supporting layer (1) and the outer supporting layer (2), a retaining ring (5) and a retaining ring (6) are both arranged between the inner supporting layer (1) and the outer supporting layer (2) and close both ends of the gap, and a filling cavity is formed between the supporting layer, the outer supporting layer (2), the retaining ring (5) and the retaining ring (6), and the filling cavity is filled with heat insulating particles (3).

2. The steam turbine thermal insulation sleeve based on a multi-layer composite structure according to claim 1, characterized in that: A plurality of partitions (4) are arranged at equal intervals between the outer supporting layer (2) and the inner supporting layer (1), and the partitions (4) divide the filling cavity formed between the inner supporting layer (1), the outer supporting layer (2), the first retaining ring (5) and the second retaining ring (6) into a plurality of mutually disconnected chambers.

3. The steam turbine thermal insulation sleeve based on a multi-layer composite structure according to claim 2, characterized in that: The inner side of the outer supporting layer (2) has a plurality of outer slots (201) distributed at equal intervals, the outer side of the inner supporting layer (1) has a plurality of inner slots (101) distributed at equal intervals, and the partition (4) is inserted between the inner slots (101) and the outer slots (201).

4. The steam turbine thermal insulation sleeve based on a multi-layer composite structure according to claim 1, characterized in that: The steam turbine thermal insulation sleeve based on the multi-layer composite structure further comprises a plurality of connecting rings (7), and the plurality of inner supporting layers (1) and the outer supporting layers (2) are connected via the connecting rings (7).

5. The steam turbine thermal insulation sleeve based on the multi-layer composite structure according to claim 4, characterized in that: An inner annular groove (705) and an outer annular groove (704) are provided on both sides of the connecting ring (7); the two ends of the inner supporting layer (1) are inserted into the inner annular groove (705), and the two ends of the outer supporting layer (2) are inserted into the outer annular groove (704).

6. The steam turbine thermal insulation sleeve based on a multi-layer composite structure according to claim 5, characterized in that: The connecting ring (7) comprises an outer supporting ring (701), an inner supporting ring (702), an annular fixing capsule (703) and a connecting tube (706); the annular fixing capsule (703) is fixedly arranged between the outer supporting ring (701) and the inner supporting ring (702); a plurality of connecting tubes (706) are provided; one end of the connecting tube (706) is fixedly connected to the outer supporting ring (701); the other end of the connecting tube (706) is fixedly connected to the inner supporting ring (702); the connecting tube (706) passes through the annular fixing capsule (703); an outer annular groove (704) is arranged between the annular fixing capsule (703) and the outer supporting ring (701); and an inner annular groove (705) is arranged between the annular fixing capsule (703) and the inner supporting ring (702).

7. The steam turbine thermal insulation sleeve based on a multi-layer composite structure according to claim 6, characterized in that: The connecting ring (7) is provided with a plurality of fixing components, which are used to fix the connecting ring (7) on the turbine pipeline. The plurality of fixing components are distributed in a ring array with the axis of the connecting ring (7) as the array center.

8. The steam turbine thermal insulation sleeve based on a multi-layer composite structure according to claim 7, characterized in that: The fixing assembly includes a screw (8), a mounting seat (10) and a rubber pad (11), wherein the screw (8) passes through the connecting tube (706) and is threadedly connected to the connecting tube (706), a knob (9) is fixedly mounted on one end of the screw (8) away from the inner support ring (702), a mounting seat (10) is rotatably mounted on one end of the screw (8) away from the knob (9), a rubber pad (11) is fixedly mounted on one side of the mounting seat (10) away from the screw (8), a guide column (12) is fixedly mounted on the mounting seat (10), the guide column (12) passes through the inner support ring (702), and the guide column (12) is slidably fitted with the inner support ring (702).

9. The steam turbine thermal insulation sleeve based on the multi-layer composite structure according to claim 8, characterized in that: The rubber pad (11) is a hollow structure. An infusion channel is provided inside the guide column (12). One end of the guide column (12) away from the mounting seat (10) extends into the interior of the annular fixing bag (703). Both ends of the infusion channel are respectively connected to the rubber pad (11) and the annular fixing bag (703). The infusion channel, the rubber pad (11) and the annular fixing bag (703) are all filled with oil. One end of the guide column (12) extending into the annular fixing bag (703) is fixedly mounted with a mounting ring (13). A bellows (14) is sleeved on the guide column (12). One end of the bellows (14) is fixedly connected to the mounting ring (13), and the other end of the bellows (14) is fixedly connected to the inner peripheral wall of the annular fixing bag (703). The guide column (12) and the annular fixing bag (703) are movably matched.

10. The steam turbine thermal insulation sleeve based on a multi-layer composite structure according to claim 1, characterized in that: The retaining ring (5) is provided with a plurality of feed holes (501). When installed, particles are injected into the filling cavity through the feed holes (501).

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