A steam turbine heat insulation jacket based on a multi-layer composite structure

Abstract

This invention relates to the field of thermal insulation sleeve technology and discloses a steam turbine thermal insulation sleeve based on a multi-layer composite structure, including an inner support layer, an outer support layer, a first retaining ring, and a second retaining ring. Both the inner and outer support layers are cylindrical structures, with the inner support layer located inside the outer support layer, and a gap provided between the inner and outer support layers. This invention solves the technical problem of existing thermal insulation sleeves having uniform thermal insulation performance due to fixed materials, making them unsuitable for adapting to the differentiated temperature requirements of different parts of the steam turbine. By selecting thermal insulation particles with corresponding high-temperature resistance characteristics according to different temperature zones of the steam turbine, the thermal insulation sleeve achieves precise adaptation to various heat-generating parts of the steam turbine, thereby improving overall thermal insulation efficiency and avoiding insufficient thermal insulation in high-temperature zones and material waste in low-temperature zones.

Description

Technical Field

[0001] This invention relates to the field of heat insulation sleeve technology, specifically a steam turbine heat insulation sleeve based on a multi-layer composite structure. Background Technology

[0002] A steam turbine is a rotary power machine that converts the thermal energy of steam into mechanical energy. It is widely used in power generation, shipbuilding, and other fields. Steam expands between the blades, driving a rotor to rotate, which in turn drives generators or other equipment. A thermal insulation jacket is a protective device with heat insulation functions. It is typically wrapped around the outer surface of high-temperature equipment such as steam turbines to reduce heat loss, lower the ambient temperature, protect operators from burns, and improve the safety and energy efficiency of equipment operation.

[0003] Chinese patent CN102200213B discloses a detachable and reusable flexible sound and heat insulation sleeve, comprising an inner layer and an outer layer. Its key feature is that it further includes at least one sound-absorbing layer, at least one heat radiation reflective layer, and at least one damping sound insulation layer located between the inner and outer layers. The inner layer, outer layer, sound-absorbing layer, heat radiation reflective layer, and damping sound insulation layer are all made of flexible materials and are connected to each other. The inner layer is made of high-temperature resistant fabric and is adjacent to the sound-absorbing layer. The innermost heat radiation reflective layer is adjacent to the sound-absorbing layer on its inner side, and the innermost damping sound insulation layer is located on the outer side of the heat radiation reflective layer. The inner surface of the heat radiation reflective layer is a heat-reflecting surface. A connecting device is provided on at least one side of the outer layer. This invention simultaneously provides sound and heat insulation, and occupies little space, is thin, has a wide range of applications, 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 structure design, with each layer made of a fixed material. This directly results in a uniform thermal insulation performance, making it impossible to adjust them specifically according to actual usage needs. Steam turbines, as complex power equipment, exhibit significant differences in the heating temperatures of different parts. For example, the temperature range of the piping section varies considerably due to different steam flow conditions. The main steam pipes are subjected to high-temperature, high-pressure steam of 400–566°C for extended periods, the reheat steam pipes are around 300–538°C, while the low-pressure steam pipes can reach temperatures as low as 120–200°C. Around rotating components such as bearing housings, the temperature fluctuates between 80–150°C due to frictional heat and residual steam heat. This multi-regional, differentiated temperature distribution places refined demands on the performance of the thermal insulation sleeve. However, existing thermal insulation sleeves, due to their fixed materials and uniform performance, cannot achieve targeted thermal insulation for different parts. They either suffer from insufficient insulation in high-temperature areas or material waste in low-temperature areas, failing to balance adaptability and economy.

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

[0006] The purpose of this invention is to provide a turbine heat insulation sleeve based on a multi-layer composite structure, which solves the technical problem that the existing multi-layer integrated heat insulation sleeves have uniform heat insulation performance due to fixed materials and cannot adapt to the different temperature requirements of different parts of the turbine.

[0007] The above-mentioned technical objective of the present invention is achieved through the following technical solution: a steam turbine heat insulation sleeve based on a multi-layer composite structure, comprising an inner support layer, an outer support layer, a first retaining ring, and a second retaining ring. Both the inner support layer and the outer support layer are cylindrical structures, and the inner support layer is disposed inside the outer support layer. A gap is provided between the inner support layer and the outer support layer. The first retaining ring and the second retaining ring are disposed between the inner support layer and the outer support layer and close both ends of the gap. A filling cavity is formed between the support layer, the outer support layer, the first retaining ring, and the second retaining ring, and the filling cavity is filled with heat insulation particles.

[0008] A further provision of the present invention is that a plurality of partitions are equidistantly arranged between the outer support layer and the inner support layer, and the partitions divide the filling cavity formed between the inner support layer, the outer support layer, the first retaining ring and the second retaining ring into a plurality of non-communicating chambers.

[0009] A further feature of the present invention is that: a plurality of external slots are equidistantly distributed on the inner side of the outer support layer, a plurality of internal slots are equidistantly distributed on the outer side of the inner support layer, and the partition is inserted between the internal slots and the external slots.

[0010] A further feature of the present invention is that the turbine heat insulation sleeve based on the multi-layer composite structure also includes multiple connecting rings, and multiple inner support layers and outer support layers are connected by the connecting rings.

[0011] A further feature of the present invention is that: both sides of the connecting ring are provided with an inner annular groove and an outer annular groove, the two ends of the inner support layer are inserted into the inner annular groove, and the two ends of the outer support layer are inserted into the outer annular groove.

[0012] A further configuration of the present invention is as follows: the connecting ring includes an outer support ring, an inner support ring, an annular fixing bladder, and a connecting cylinder. The annular fixing bladder is fixedly disposed between the outer support ring and the inner support ring. Multiple connecting cylinders are provided. One end of the connecting cylinder is fixedly connected to the outer support ring, and the other end of the connecting cylinder is fixedly connected to the inner support ring. The connecting cylinder passes through the annular fixing bladder. An outer annular groove is disposed between the annular fixing bladder and the outer support ring, and an inner annular groove is disposed between the annular fixing bladder and the inner support ring.

[0013] A further feature of the present invention is that the connecting ring is provided with a plurality of fixing components, which are used to fix the connecting ring to the turbine pipeline, and the plurality of fixing components are arranged in a ring array with the axis of the connecting ring as the array center.

[0014] A further configuration of the present invention is as follows: the fixing assembly includes a screw, a mounting base, and a rubber pad; the screw passes through the connecting cylinder and is threadedly connected to the connecting cylinder; a knob is fixedly installed at the end of the screw away from the inner support ring; a mounting base is rotatably installed at the end of the screw away from the knob; a rubber pad is fixedly installed on the side of the mounting base away from the screw; a guide post is fixedly installed on the mounting base; the guide post passes through the inner support ring and is slidably engaged with the inner support ring.

[0015] A further feature of the present invention is that the rubber pad has a hollow structure, the guide post has an infusion channel inside, the end of the guide post away from the mounting base extends into the interior of the annular fixation bladder, the two ends of the infusion channel are respectively connected to the rubber pad and the annular fixation bladder, the infusion channel, the rubber pad and the annular fixation bladder are all filled with oil, the end of the guide post extending into the annular fixation bladder is fixedly installed with an mounting ring, a corrugated tube is sleeved on the guide post, one end of the corrugated tube is fixedly connected to the mounting ring, and the other end of the corrugated tube is fixedly connected to the inner peripheral wall of the annular fixation bladder, and the guide post and the annular fixation bladder are movably fitted together.

[0016] A further feature of the present invention is that the retaining ring is provided with a plurality of feed holes, and during installation, the particles are injected into the filling cavity through the feed holes.

[0017] In summary, the present invention has the following beneficial effects: By setting up an inner support layer, an outer support layer, and a filling cavity that can be filled with heat-insulating particles, and by using baffle rings one and two to seal both ends of the filling cavity, the present invention solves the technical problem that existing heat insulation sleeves, due to their fixed material, result in uniform heat insulation performance and cannot adapt to the differentiated temperature requirements of different parts of the steam turbine. By selecting heat-insulating particles with corresponding high-temperature resistance characteristics according to different temperature zones of the steam turbine, the present invention achieves precise adaptation of the heat insulation sleeve to various heat-generating parts of the steam turbine, thereby improving overall heat insulation efficiency and avoiding insufficient heat insulation in high-temperature zones and material waste in low-temperature zones. Furthermore, by using partitions in conjunction with inner and outer slots, the filling cavity is divided into multiple non-interconnected chambers, solving the technical problem that uneven distribution of heat-insulating particles caused by their flow within the filling cavity affects the heat insulation effect.

[0018] Furthermore, through the linkage design of the connecting ring and the fixing components, the transfer of oil to the annular fixing bladder when the rubber pad is compressed achieves the clamping and fixing of the inner support layer, the outer support layer and the connecting ring. This solves the technical problems of cumbersome splicing and installation of the heat insulation sleeve and insufficient fixing stability. It enables flexible adjustment of the length of the heat insulation sleeve and rapid and stable installation, thereby reducing transportation costs, improving installation convenience and structural stability. At the same time, the replaceability of the heat insulation particles reduces local maintenance costs and labor time. Attached Figure Description

[0019] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0020] Figure 2 This is a three-dimensional structural diagram of the present invention when multiple heat insulation sleeves are connected together;

[0021] Figure 3 This is a schematic diagram of the connecting ring of the present invention;

[0022] Figure 4 This is a side cross-sectional view of the present invention.

[0023] Figure 5 for Figure 4 A magnified structural diagram at point A;

[0024] Figure 6 This is a schematic diagram of the structure of the inner support layer, outer support layer, retaining ring one, and retaining ring two of the present invention;

[0025] Figure 7 This is a schematic diagram of the structure of the inner support layer of the present invention when it is deployed;

[0026] Figure 8 This is a cross-sectional view of the connecting ring of the present invention;

[0027] Figure 9 for Figure 8 A magnified structural diagram at point B;

[0028] Figure 10 This is a schematic diagram of the fixing component of the present invention.

[0029] In the diagram: 1. Inner support layer; 101. Inner slot; 2. Outer support layer; 201. Outer slot; 3. Insulation particles; 4. Partition plate; 5. First retaining ring; 501. Feed hole; 6. Second retaining ring; 7. Connecting ring; 701. Outer support ring; 702. Inner support ring; 703. Annular fixing bladder; 704. Outer annular groove; 705. Inner annular groove; 706. Connecting cylinder; 8. Screw; 9. Knob; 10. Mounting base; 11. Rubber pad; 12. Guide post; 13. Mounting ring; 14. Corrugated pipe. Detailed Implementation

[0030] The present invention will be further described below with reference to the accompanying drawings in the embodiments of the present invention.

[0031] Please see Figures 1 to 7In this embodiment of the invention, a turbine heat insulation sleeve based on a multi-layer composite structure includes an inner support layer 1, an outer support layer 2, a first baffle ring 5, and a second baffle ring 6. Both the inner support layer 1 and the outer support layer 2 are cylindrical structures, and the inner support layer 1 is disposed inside the outer support layer 2. A gap is provided between the inner support layer 1 and the outer support layer 2. The first baffle ring 5 and the second baffle ring 6 are both disposed 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 baffle ring 5, and the second baffle ring 6, and the filling cavity is filled with heat insulation particles 3.

[0032] It should be noted that retaining ring 5 and retaining ring 6 are made of rigid heat insulation material. Cordierite-mullite ceramic can be selected, which has excellent high-temperature resistance, a long-term operating temperature ≤1200℃, a low coefficient of thermal expansion, and strong thermal shock resistance. It can withstand temperature fluctuations in high-temperature areas such as the main steam pipeline and high-pressure cylinder of the steam turbine, and has high hardness and is not easily deformed, effectively sealing both ends of the filling cavity to prevent leakage of the heat insulation particles 3. Alternatively, silicon carbide ceramic can be selected, with a long-term operating temperature ≤1600℃, and excellent corrosion resistance, suitable for the area surrounding reheat steam pipelines in steam turbines where they come into contact with steam and may contain trace amounts of corrosive media. To maintain long-term structural stability, high-temperature resistant resin-based composite ceramics can also be selected. This material is made of phenolic resin as the matrix and mixed with ceramic micro powder and pressed. The long-term service temperature is ≤600℃. It also has a certain degree of toughness and better impact resistance than pure ceramics, making it suitable for medium and low temperature areas such as low-pressure cylinders and bearing housings of steam turbines. It is not easily broken due to vibration or collision during installation. The heat insulation particles 3 are made of heat insulation material. The heat insulation particles 3 are elastic to reduce the gaps between the heat insulation particles 3 during filling. Elastic ceramic fiber particles can be selected. They are made of alumina-silica ceramic fibers cut into short particles of 3-5mm, which have a certain degree of elasticity and a compression rebound rate ≥ 80% of the material can fill gaps through its own deformation during filling. Its thermal conductivity is as low as 0.03–0.05 W / (m·K), and its long-term operating temperature is ≤1000℃. It is suitable for high-temperature areas such as main steam pipes of steam turbines (400–566℃) and high-pressure cylinders (350–500℃). Alternatively, expanded vermiculite modified particles can be selected. These particles are made by coating natural expanded vermiculite with an organosilicon coating, retaining its high-temperature resistance of ≤800℃ while increasing elasticity. The bulk density is 120–150 kg / m³, and it can rebound after compression. Its thermal conductivity is 0.04–0.06 W / (m·K). Suitable for medium-temperature areas such as reheat steam pipelines (300~538℃) and medium-pressure cylinders (250~400℃), with improved moisture resistance, it can avoid the insulation effect being affected by steam condensation; glass microsphere-elastic resin composite particles can also be selected, which are hollow glass microspheres with a thermal conductivity of 0.02~0.04W / (m・K) as the core and covered with a silicone rubber elastic layer. They have excellent elasticity and a tensile rebound rate of ≥90%, and can withstand high temperatures of ≤300℃. They are suitable for low-temperature areas such as low-pressure steam pipelines (120~200℃) and bearing boxes (80~150℃). They can be tightly fitted during filling to reduce the gaps between particles;

[0033] This invention utilizes a three-layer structure: an inner support layer 1, an outer support layer 2, and insulation particles 3. The outer support layer 2 and the inner support layer 1 provide support and are made of a flexible insulation material. These, along with baffle rings 5 ​​and 6, form a filling cavity. Different insulation particles 3 can be selected within the cavity according to insulation requirements. (For example, the selection of insulation particles 3 must be precisely tailored to different temperature zones of the steam turbine: for ultra-high temperature zones (400–566℃, such as main steam pipes and high-pressure cylinders), elastic ceramic fiber particles (temperature resistance ≤1000℃) or high-purity alumina ceramic particles (thermal conductivity 0.03–0.07 W / (m·K), temperature resistance ≤1200℃) are preferred to ensure no softening or deformation under long-term high temperatures; for medium temperature zones (200–400℃, such as reheat steam pipes and intermediate-pressure cylinders), expanded vermiculite modified particles (temperature resistance ≤800℃) or ceramic-glass composite particles (thermal conductivity 0.02 W / (m·K)) are selected.) With a thermal conductivity of 0.5-0.04 W / (m·K) and a high temperature resistance of ≤800℃, it can balance thermal insulation and cost. In low-temperature areas (50-200℃, such as low-pressure cylinders and bearing boxes), glass microsphere-elastic resin composite particles or expanded perlite coated with an anti-hygroscopic coating (thermal conductivity 0.025-0.045 W / (m·K)) can be selected, which can balance lightweight and elastic buffering. The thermal insulation particles 3 form an elastic buffer layer through the gaps between the particles. When the thermal insulation sleeve is subjected to vibration or impact, the thermal insulation particles 3 can absorb energy through relative displacement, reducing the stress transmission to the inner layer, outer layer and the insulated object. At the same time, the free space between the particles can alleviate the thermal expansion and contraction stress caused by temperature changes, reducing the risk of the thermal insulation sleeve cracking due to deformation. Because the thermal insulation particles 3 are replaceable, if the particles in some areas age due to high temperature, corrosion, etc., it is only necessary to supplement or replace the thermal insulation particles 3 in the damaged areas, without replacing the inner support layer 1 and the outer support layer 2 structure, which greatly reduces maintenance costs and labor time.

[0034] In this embodiment, preferably, multiple partitions 4 are equidistantly arranged between the outer support layer 2 and the inner support layer 1. The partitions 4 divide the filling cavity formed between the inner support layer 1, the outer support layer 2, the first retaining ring 5, and the second retaining ring 6 into multiple non-communicating chambers. Multiple outer slots 201 are equidistantly distributed on the inner side of the outer support layer 2, and multiple inner slots 101 are equidistantly distributed on the outer side of the inner support layer 1. The partitions 4 are inserted between the inner slots 101 and the outer slots 201. The partitions 4 are made of rigid heat-insulating material (the material selection of the partitions 4 prioritizes compatibility with the material of the retaining rings. If the partitions 4 are used in high-temperature areas such as the filling cavity of the main steam pipe section, cordierite-mullite ceramic or silicon carbide ceramic, the same as that of the retaining rings, can be selected to reduce the difference in thermal expansion coefficients and avoid particle leakage due to temperature changes). If the partition 4 is used in low-pressure cylinder sections or other medium-low temperature areas, high-temperature resistant calcium silicate boards can be selected. During installation, 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 positioned opposite each other. 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 first retaining ring 5, and the second retaining ring 6 into multiple non-communicating chambers, so that the heat insulation particles 3 will not flow between the chambers, thereby making the heat insulation particles 3 evenly distributed in each chamber to ensure the heat insulation effect. In addition, the partition 4, together with the inner slot 101 and the outer slot 201, prevents the outer support layer 2 from rotating relative to the inner support layer 1, thereby ensuring the stability of the structure.

[0035] In this embodiment, preferably, both the outer support layer 2 and the inner support layer 1 are made by winding a strip structure into a cylindrical shape. The two ends of the outer support layer 2 and the inner support layer 1 are bonded together with adhesive. The adhesive can be a silicone high-temperature resistant adhesive (such as Dow Corning 734), with a bonding strength ≥2MPa, high temperature resistance ≤300℃, and a certain degree of elasticity, suitable for bonding the support layer to the retaining ring and connecting ring 7 in low-pressure cylinders, bearing housing sections, and other medium-low temperature areas, and is resistant to steam corrosion. Alternatively, a ceramic-based high-temperature adhesive (such as Beijing Tianshan TS806) can be used. This adhesive uses ceramic powder as filler, has a high temperature resistance ≤1200℃, a bonding strength ≥3MPa, and is suitable for high-temperature areas such as main steam pipes and high-pressure cylinder sections. After curing, it is impact-resistant and thermally shock resistant. The outer support layer 2 and the inner support layer 1 need to have flexibility and flexible thermal insulation properties, and can be made of silicone rubber fiberglass cloth, with a base material of fiberglass resistant to temperatures ≤550℃. Vibratory cloth, coated with silicone rubber with a temperature resistance of ≤300℃, has a thickness of 0.3~0.5mm and a bending radius of ≤50mm. It combines thermal insulation with wear resistance and a thermal conductivity of 0.035~0.05W / (m・K), making it suitable for medium and low temperature areas. Alternatively, flexible ceramic fiber cloth can be used. It is woven from alumina-silica ceramic fibers, has a temperature resistance of ≤1200℃, a bending radius of ≤30mm, a thickness of 0.5~1mm, and a thermal conductivity of 0.03~0.05W / (m・K). It is suitable for high-temperature areas such as main steam pipes and high-pressure cylinder sections, and is resistant to aging and steam erosion. Through the configuration of this embodiment, the outer support layer 2 and the inner support layer 1 can be cut and manufactured on-site. 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, which improves the convenience of transportation.

[0036] In this embodiment, preferably, the first baffle ring 5 is provided with multiple feed holes 501. When the first baffle ring 5 and the second baffle ring 6 are installed, the first baffle ring 5 and the second baffle ring 6 are bonded to the outer support layer 2 and the inner support layer 1. 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 filling, the feed holes 501 are sealed.

[0037] Please see Figure 3 and Figures 8-10 In this embodiment of the invention, the turbine heat insulation sleeve based on the multi-layer composite structure further includes multiple connecting rings 7. Multiple inner support layers 1 and outer support layers 2 are connected by connecting rings 7, so that the heat insulation sleeve can be spliced ​​into different lengths according to usage requirements to adapt to turbine pipes of different lengths. Both sides of the connecting ring 7 are provided with inner annular grooves 705 and outer annular grooves 704. The two ends of the inner support layer 1 are inserted into the inner annular grooves 705, and the two ends of the outer support layer 2 are inserted into the outer annular grooves 704, so that the outer support layer 2 and the inner support layer 1 are inserted into the connecting ring 7.

[0038] In this embodiment, preferably, the connecting ring 7 includes an outer support ring 701, an inner support ring 702, an annular fixing bladder 703, and a connecting cylinder 706. The annular fixing bladder 703 is fixedly disposed between the outer support ring 701 and the inner support ring 702. Multiple connecting cylinders 706 are provided, with one end of each connecting cylinder 706 fixedly connected to the outer support ring 701 and the other end fixedly connected to the inner support ring 702. The connecting cylinder 706 passes through the annular fixing bladder 703. An outer annular groove 704 is disposed between the annular fixing bladder 703 and the outer support ring 701, and an inner annular groove 705 is disposed between the annular fixing bladder 703 and the outer support ring 701. Between the annular fixing bladder 703 and the inner support ring 702; the two ends of the connecting cylinder 706 are respectively fixedly connected to the inner and outer peripheral walls of the annular fixing bladder 703. The annular fixing bladder 703 is a hollow structure and has elasticity. When oil is introduced into the annular fixing bladder 703, the annular fixing bladder 703 expands, which reduces 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, so as to connect the connecting ring 7 to the outer support layer 2 and the inner support layer 1.

[0039] In this embodiment, preferably, the connecting ring 7 is provided with multiple fixing components. These fixing components are used to fix the connecting ring 7 to the turbine pipeline. The multiple fixing components are arranged 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 connecting cylinders 706. Each fixing component includes a screw 8, a mounting base 10, and a rubber pad 11. The screw 8 passes through the connecting cylinder 706 and is threadedly connected to it. A knob 9 is fixedly installed at the end of the screw 8 away from the inner support ring 702, and the mounting base 10 is rotatably installed at the end of the screw 8 away from the knob 9. A rubber pad 11 is fixedly installed on the side of the mounting base 10 away from the screw 8. A guide post 12 is fixedly installed on the mounting base 10. The guide post 12 penetrates the inner support ring 702, and the guide post 12 and the inner support ring 702 are slidably engaged. The rubber pad 11 has a hollow structure. An infusion channel is opened inside the guide post 12. The end of the guide post 12 away from the mounting base 10 extends into the interior of the annular fixation bladder 703. The two ends of the infusion channel are respectively connected to the rubber pad 11 and the annular fixation bladder 703. The infusion channel, the rubber pad 11, and the annular fixation bladder 703 are all filled with oil. An installation ring 13 is fixedly installed on the end of the guide post 12 that extends into the annular fixation bladder 703. A corrugated tube 14 is sleeved on the guide post 12. One end of the corrugated tube 14 is fixed to the installation ring 13. The bellows 14 is fixedly connected to the inner circumferential wall of the annular fixing bladder 703, and the guide post 12 is movably fitted with the annular fixing bladder 703. When fixing the connecting ring 7 to the turbine pipeline using the fixing assembly, first, the connecting ring 7 is placed on the turbine pipeline, and then the screw 8 is rotated by the knob 9, causing the mounting seat 10 to move the rubber pad 11 toward the turbine pipeline. When the rubber pad 11 presses against the turbine pipeline, the connecting ring 7 can be initially fixed to the turbine pipeline. Then, the inner support layer 1, the outer support layer 2, the retaining ring 5 and the retaining ring 6 are installed, and the heat insulation particles 3 are filled. Then, the knob 9 is tightened further to compress the rubber pad 11 to improve the fixation firmness. When the rubber pad 11 is compressed, the oil inside the rubber pad 11 enters the annular fixing bladder 703 through the oil delivery channel opened inside the guide post 12, causing the annular fixing bladder 703 to expand. The expansion of the annular fixing bladder 703 reduces 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, thus fixing the two ends of the inner support layer 1 and the outer support layer 2, so as to connect the connecting ring 7 to the outer support layer 2 and the inner support layer 1. While fixing the connecting ring 7 to the turbine pipeline, the transfer of oil can be used to fix the outer support layer 2 and the inner support layer 1, 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 fixing bladder 703 to prevent oil leakage. It should be noted that after the heat insulation sleeve is installed, heat insulation material needs to be used to seal the gaps at both ends of the heat insulation sleeve. The specific sealing method is existing technology and will not be described in detail here.

[0040] The above description is only a preferred embodiment of the present invention. Therefore, all equivalent changes or modifications made to the structure, features and principles described in the claims of this patent application are included in the scope of this patent application.

Claims

1. A steam turbine heat 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: Both the inner support layer (1) and the outer support layer (2) are cylindrical structures, and the inner support layer (1) is located inside the outer support layer (2). There is a gap between the inner support layer (1) and the outer support layer (2). The first baffle ring (5) and the second baffle ring (6) are located between the inner support layer (1) and the outer support layer (2) and close the two ends of the gap. A filling cavity is formed between the support layer, the outer support layer (2), the first baffle ring (5) and the second baffle ring (6), and the filling cavity is filled with heat insulation particles (3). The turbine heat insulation sleeve based on the multi-layer composite structure also includes multiple connecting rings (7), and multiple inner support layers (1) and outer support layers (2) are connected by the connecting rings (7); The connecting ring (7) has an inner annular groove (705) and an outer annular groove (704) on both sides. The two ends of the inner support layer (1) are inserted into the inner annular groove (705), and the two ends of the outer support layer (2) are inserted into the outer annular groove (704). The connecting ring (7) includes an outer support ring (701), an inner support ring (702), an annular fixing bladder (703), and a connecting cylinder (706). The annular fixing bladder (703) is fixedly disposed between the outer support ring (701) and the inner support ring (702). Multiple connecting cylinders (706) are provided. One end of the connecting cylinder (706) is fixedly connected to the outer support ring (701), and the other end of the connecting cylinder (706) is fixedly connected to the inner support ring (702). The connecting cylinder (706) passes through the annular fixing bladder (703). An outer annular groove (704) is disposed between the annular fixing bladder (703) and the outer support ring (701), and an inner annular groove (705) is disposed between the annular fixing bladder (703) and the inner support ring (702). The connecting ring (7) is provided with multiple fixing components. The fixing components are used to fix the connecting ring (7) on the steam turbine pipeline. The multiple fixing components are arranged in a ring array with the axis of the connecting ring (7) as the array center. The fixing assembly includes a screw (8), a mounting base (10), and a rubber pad (11). The screw (8) passes through the connecting cylinder (706) and is threadedly connected to the connecting cylinder (706). A knob (9) is fixedly installed at one end of the screw (8) away from the inner support ring (702). The mounting base (10) is rotatably installed at the other end of the screw (8) away from the knob (9). A rubber pad (11) is fixedly installed on one side of the mounting base (10) away from the screw (8). A guide post (12) is fixedly installed on the mounting base (10). The guide post (12) passes through the inner support ring (702) and is slidably engaged with the inner support ring (702). The rubber pad (11) has a hollow structure. The guide post (12) has an infusion channel inside. The end of the guide post (12) away from the mounting base (10) extends into the interior of the annular fixation bladder (703). The two ends of the infusion channel are connected to the rubber pad (11) and the annular fixation bladder (703) respectively. The infusion channel, the rubber pad (11) and the annular fixation bladder (703) are all filled with oil. The end of the guide post (12) that extends into the annular fixation bladder (703) is fixedly installed with an mounting ring (13). A corrugated tube (14) is sleeved on the guide post (12). One end of the corrugated tube (14) is fixedly connected to the mounting ring (13), and the other end of the corrugated tube (14) is fixedly connected to the inner peripheral wall of the annular fixation bladder (703). The guide post (12) and the annular fixation bladder (703) are movably connected.

2. The turbine heat insulation sleeve based on a multi-layer composite structure according to claim 1, characterized in that: Multiple partitions (4) are equidistantly arranged between the outer support layer (2) and the inner support layer (1). The partitions (4) divide the filling cavity formed between the inner support layer (1), the outer support layer (2), the first retaining ring (5) and the second retaining ring (6) into multiple non-communicating chambers.

3. A turbine heat insulation sleeve based on a multi-layer composite structure according to claim 2, characterized in that: The outer support layer (2) has multiple outer slots (201) evenly distributed on its inner side, and the inner support layer (1) has multiple inner slots (101) evenly distributed on its outer side. The partition (4) is inserted between the inner slots (101) and the outer slots (201).

4. A turbine heat insulation sleeve based on a multi-layer composite structure according to claim 1, characterized in that: The retaining ring (5) is provided with multiple feed holes (501). During installation, the particles are injected into the filling cavity through the feed holes (501).

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