Structure for effectively reducing cold loss of oil bearing turbo expander

Abstract

The utility model discloses a structure for effectively reducing cold loss of an oil bearing turbo expander, which comprises a machine body, the front end of the machine body is connected with an expander inlet pipe and an expander outlet pipe, and the rear end of the machine body is connected with a supercharger inlet pipe and a second supercharger inlet pipe. An adjustable nozzle, a positioning disc, a heat insulation plate, a heat insulation pad, a front bearing, a front sealing cover, a front sealing sleeve, an epoxy glass cloth plate pressing disc and a front partition plate are positioned in the middle of the machine body, and the adjustable nozzle comprises a positioning screw, a positioning pressing disc, a disc body and a cover plate pin. According to the structure for effectively reducing cold loss of the oil bearing turbo expander, heat conduction of a low-temperature part and a normal-temperature part of the expander can be basically isolated by improving the structure of the adjustable nozzle and improving the performance of a heat insulation material-epoxy glass cloth plate, cold transfer can be reduced to the maximum extent, and the service life of the expander is prolonged. The surface of the expansion machine body and the surface of the cold insulation box are not frozen.

Description

Technical Field

[0001] The utility model relates to the field of deep-cold air separation equipment, in particular to a structure that effectively reduces the cooling of an oil bearing turbine expander. Background Art

[0002] The structure for reducing the cooling of the oil-bearing turbine expander is a supporting structure for deep-cold air separation. The performance of the turbine expander, as a key supporting core unit in the air separation equipment, directly determines the technical level of the entire product. With the continuous development of science and technology, people have higher and higher requirements on the manufacturing process of the structure for reducing the cooling of the oil-bearing turbine expander.

[0003] The existing turbine expanders have certain drawbacks when in use. Due to the structure and materials, the existing oil bearing expanders have frost and ice on the fuselage and cold storage box during operation, which seriously affects the appearance of the equipment and easily causes users to worry about the safety of the expander operation. It even causes users to refuse to accept the performance of the equipment. The existing expanders, due to the increasing inlet flow, the appearance of the equipment is also getting larger and larger. The weight of the adjustable nozzle assembly usually exceeds 100 kilograms, which exceeds the maintenance weight of a worker to install and disassemble. Since the expander is a long-term working equipment and because of the environment (industry) in which it is used, it needs to be regularly inspected, that is, the expander needs to be disassembled. The components that need to be inspected are mainly adjustable nozzles, rotors, bearings, sealing sleeves and other components. Except for the adjustable nozzle, the weight of the remaining components is within 50 kilograms, which is within the maintenance weight that a worker can carry, so it is very necessary to reduce the maintenance weight of the adjustable nozzle. At present, due to the large overall maintenance weight of the adjustable nozzle assembly, it is obviously unrealistic to assemble it manually during maintenance. It is necessary to hire an air crane to disassemble and assemble the adjustable nozzle assembly of the expander. The total time for a single disassembly, maintenance and assembly is usually 1-2 days, and the cost of hiring an air crane for 2 days is usually about 10,000 yuan. The equipment is maintained regularly. If the expander nozzle is damaged due to user operating errors, it is also a common occurrence. In the long run, the cost is unbearable for the equipment user unit or the equipment production and after-sales unit. For this reason, we propose a structure that effectively reduces the cooling of the oil bearing turbine expander. Summary of the invention

[0004] Technical problem solved: In view of the deficiencies in the prior art, the utility model provides a structure that effectively reduces the cooling of the oil bearing turbine expander. By improving the structure of the adjustable nozzle and improving the performance of the insulating material - epoxy glass cloth board, the heat conduction between the low-temperature part and the normal-temperature part of the expander can be basically isolated, and the transfer of cold can be reduced to the greatest extent, so as to prevent the expander body and the surface of the cold-keeping box from ice, which can effectively solve the problems in the background technology.

[0005] Technical solution: To achieve the above-mentioned purpose, the technical solution adopted by the utility model is: a structure that effectively reduces the cooling of the oil bearing turbine expander, including a fuselage, the front end of the fuselage is connected with an expander inlet pipe and an expander outlet pipe, the rear end of the fuselage is connected with a first supercharger inlet pipe and a second supercharger inlet pipe, and the middle part of the fuselage is positioned with an adjustable nozzle, a positioning plate, an insulation plate, an insulation pad, a front bearing, a front sealing cover, a front sealing sleeve, an epoxy glass cloth plate pressure plate and a front partition.

[0006] Preferably, the adjustable nozzle includes a positioning screw, a positioning pressure plate, a disk body, a cover plate, a pin, a positioning sleeve, a clamping screw, a first nut, a sliding disk, a second nut, a rotating blade, a spring, a screw assembly and a gasket, the positioning screw is located on the disk body, the pin is located on the first nut, and the clamping screw and the second nut are located on the sliding disk.

[0007] Preferably, the expander inlet pipe, the expander outlet pipe, the first supercharger inlet pipe and the second supercharger inlet pipe are all provided with temperature monitoring sensors, and the inner wall surfaces of the expander inlet pipe, the expander outlet pipe, the first supercharger inlet pipe and the second supercharger inlet pipe are all integrally formed with sealing insulation sheets.

[0008] Preferably, an end cover, a turbine volute and a diffusion chamber are installed at the bottom of the expander outlet pipe.

[0009] Preferably, the rear end of the fuselage is positioned with a boost end sealing air inlet, a supercharger volute, a rear sealing cover, a rear sealing sleeve, a rotor, a rear partition and a rear bearing. The rear bearing is positioned on the rear partition, and the supercharger volute is fixed to the rear sealing cover.

[0010] Preferably, nitrogen is produced between the expander inlet pipe, the expander outlet pipe and the fuselage, and multiple groups of epoxy glass cloth plate pressure plates are arranged on the outside for sealing and heat preservation.

[0011] Beneficial effects: Compared with the prior art, the utility model provides a structure that effectively reduces the cooling of the oil bearing turbine expander, and has the following beneficial effects: This structure that effectively reduces the cooling of the oil bearing turbine expander can basically isolate the heat conduction between the low temperature part and the normal temperature part of the expander by improving the structure of the adjustable nozzle and improving the performance of the insulation material-epoxy glass cloth board, and can minimize the transfer of cold to achieve the expansion machine body and the surface of the cold preservation box without ice. Through this new structure that effectively reduces the cooling of the oil bearing turbine expander, the weight of the entire adjustable nozzle of the large expander can be controlled within the maintenance weight that can be carried by a worker. This expander is more convenient to assemble and disassemble, reduces the assembly strength, saves assembly and disassembly time and cost, and improves the economy of the equipment; by eliminating the icing phenomenon, the efficiency and economic benefits of the expander are improved, while satisfying the user's satisfaction with the operation of the expander, and the equipment can be quickly accepted. This new structure also improves the brand reputation of Suyang Company's expanders, enhances the competitiveness of complete sets of air separation products, and improves the overall level of my country's expanders;

[0012] By dividing the heaviest part of the nozzle assembly, the positioning plate, into two parts, the main weight of the positioning plate is concentrated on the positioning pressure plate, and its material is changed to epoxy glass cloth board, which greatly reduces the heat transfer and reduces the weight by 77%. The effective weight of the nozzle during installation is effectively controlled within a controllable range for workers, ensuring the assembly quality and reducing the assembly time;

[0013] The front partition between the expansion wheel and the bearing uses epoxy glass cloth to reduce heat conduction;

[0014] The insulation board between the turbine volute and the bracket vertical plate adopts epoxy glass cloth board to reduce heat conduction;

[0015] Add epoxy glass cloth gaskets to the screw ends connecting the fuselage and the positioning platen to reduce heat conduction;

[0016] Epoxy glass cloth gaskets are also added to the screw end faces connecting the turbine volute and the base frame vertical plate to reduce heat conduction. The entire structure for reducing the cooling of the oil bearing turbine expander is simple in structure, easy to operate, and has better effect than traditional methods. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 The utility model is a schematic diagram of the overall structure of a structure that effectively reduces the cooling of the oil bearing turbine expander.

[0018] Figure 2 The utility model is a schematic diagram of the structure of an adjustable nozzle in a structure for effectively reducing the cooling of an oil bearing turbine expander.

[0019] Figure 3This is a structural schematic diagram of the front view of an adjustable nozzle in a structure for effectively reducing the cooling of an oil bearing turbine expander of the utility model.

[0020] Figure 4 This is a schematic structural diagram of an enlarged view of point A in a structure for effectively reducing the cooling of an oil bearing turbine expander of the utility model.

[0021] Figure 5 The utility model is a schematic diagram of the structure of the positioning pressure plate in a structure that effectively reduces the cooling of the oil bearing turbine expander.

[0022] In the figure: 1, fuselage; 2, boost end sealing gas inlet; 3, first supercharger inlet pipe; 4, rear sealing sleeve; 5, supercharger volute; 6, rear sealing cover; 7, rotor; 8, second supercharger inlet pipe; 9, rear partition; 10, rear bearing; 11, front bearing; 12, insulation pad; 13, insulation board; 14, adjustable nozzle; 15, positioning plate; 16, end cover; 17, turbine volute; 18, expansion chamber; 19, expander outlet pipe; 20, expander inlet Tube; 21. Front sealing cover; 22. Front sealing sleeve; 23. Epoxy glass cloth plate pressure plate; 24. Front partition; 25. Positioning screw; 26. Positioning pressure plate; 27. Plate body; 28. Cover plate; 29. ​​Pin; 30. Positioning sleeve; 31. Pressing screw; 32. First nut; 33. Sliding plate; 34. Second nut; 35. Rotating blade; 36. Screw assembly; 37. Spring; 38. Gasket; 39. Sealing insulation sheet; 40. Temperature monitoring sensor. DETAILED DESCRIPTION

[0023] The technical solution of the utility model will be clearly and completely described below in conjunction with the accompanying drawings and specific embodiments, but those skilled in the art will understand that the embodiments described below are part of the embodiments of the utility model, rather than all of the embodiments, and are only used to illustrate the utility model, and should not be considered as limiting the scope of the utility model. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in the field without making creative work are within the scope of protection of the utility model. If the specific conditions are not specified in the embodiments, they are carried out according to conventional conditions or conditions recommended by the manufacturer. If the manufacturer is not specified for the reagents or instruments used, they are all conventional products that can be purchased commercially.

[0024] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0025] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0026] like Figure 1-5 As shown, a structure for effectively reducing the cooling of the oil bearing turbine expander includes a fuselage 1, the front end of the fuselage 1 is connected with an expander inlet pipe 20 and an expander outlet pipe 19, the rear end of the fuselage 1 is connected with a first supercharger inlet pipe 3 and a second supercharger inlet pipe 8, and the middle part of the fuselage 1 is positioned with an adjustable nozzle 14, a positioning plate 15, an insulation plate 13, an insulation pad 12, a front bearing 11, a front sealing cover 21, a front sealing sleeve 22, an epoxy glass cloth plate pressure plate 23 and a front partition plate 24. By improving the structure of the adjustable nozzle and improving the performance of the insulation material-epoxy glass cloth plate, the heat conduction between the low-temperature part and the normal-temperature part of the expander can be basically isolated, and the transfer of cold can be reduced to the greatest extent, so as to prevent the expansion machine fuselage and the cold-keeping box from icing.

[0027] Furthermore, the adjustable nozzle 14 includes a positioning screw 25, a positioning pressure plate 26, a disk body 27, a cover plate 28, a pin 29, a positioning sleeve 30, a clamping screw 31, a first nut 32, a sliding disk 33, a second nut 34, a rotating blade 35, a screw assembly 36, a spring 37 and a gasket 38. The positioning screw 25 is located on the disk body 27, the pin 29 is located on the first nut 32, and the clamping screw 31 and the second nut 34 are located on the sliding disk 33.

[0028] Furthermore, temperature monitoring sensors 40 are provided inside the expander inlet pipe 20, the expander outlet pipe 19, the first supercharger inlet pipe 3 and the second supercharger inlet pipe 8, and the inner wall surfaces of the expander inlet pipe 20, the expander outlet pipe 19, the first supercharger inlet pipe 3 and the second supercharger inlet pipe 8 are integrally formed with sealing insulation sheets 39.

[0029] Furthermore, an end cover 16 , a turbine volute 17 and a diffusion chamber 18 are installed at the bottom of the expander outlet pipe 19 .

[0030] Furthermore, the rear end of the fuselage 1 is positioned with a boost end sealing air inlet 2, a supercharger volute 5, a rear sealing cover 6, a rotor 7, a rear sealing sleeve 4, a rear partition 9 and a rear bearing 10. The rear bearing 10 is positioned on the rear partition 9 and fixed between the supercharger volute 5 and the rear sealing cover 6.

[0031] Furthermore, nitrogen is produced between the expander inlet pipe 20, the expander outlet pipe 19 and the fuselage 1, and multiple groups of epoxy glass cloth plate pressure plates 23 are arranged on the outside for sealing and heat preservation.

[0032] Working principle: The utility model includes a fuselage 1, a boost end sealing gas inlet 2, a first supercharger inlet pipe 3, a rear sealing sleeve 4, a supercharger volute 5, a rear sealing cover 6, a rotor 7, a second supercharger inlet pipe 8, a rear partition 9, a rear bearing 10, a front bearing 11, an insulation pad 12, a heat insulation board 13, an adjustable nozzle 14, a positioning plate 15, an end cover 16, a turbine volute 17, a diffusion chamber 18, an expander outlet pipe 19, an expander inlet pipe 20, a front sealing cover 21, a front sealing sleeve 22, an epoxy glass cloth plate pressure plate 23, a front partition 24, a positioning screw 25, a positioning pressure plate 26, a plate body 27, a cover plate 28, a pin 29, a positioning sleeve 30, a clamping screw 31, a first nut 32, a sliding plate 33, a second nut 34, a rotating blade 35, a screw assembly 36, a spring 37, a gasket 38, a sealing and heat-insulating sheet 39 and a temperature monitoring sensor 40;

[0033] Turbine expanders are widely used in chemical, steel, glass and metallurgical industries. They are the key parts necessary for obtaining cold energy in air separation equipment, natural gas liquefaction separation equipment and low-temperature crushing equipment, and are the heart that ensures the stable operation of the entire equipment. It provides almost all the cold energy in the separation equipment, and its performance directly determines the energy consumption and reliability of the separation equipment. At present, in the separation equipment, most of the supporting turbine expanders are lubricated with oil bearings. This type of expander has the advantages of easy operation, stable operation, large load capacity, and applicable to various working conditions.

[0034] Oil bearing turbine expanders need long-term stable operation, and the maintenance cycle is generally about one year. In order to ensure the normal operation of the expander, many alarm interlock measurement points are set, among which the most important measurement points are oil supply pressure, sealing gas pressure, speed and bearing temperature measurement points. Bearing temperature will affect the change of bearing clearance and the viscosity of lubricating oil, thereby affecting the stability and load-bearing capacity of the bearing. Expanders are generally equipped with turbine end bearing temperature and brake end temperature measurement points, which are measured with platinum thermal resistors. The expander is a low-temperature machine. When working, the working medium temperature at the turbine end is generally below -120℃, so the turbine end volute needs to be placed in a cold storage box filled with insulation material-pearl sand to isolate the cold storage box from the atmospheric heat conduction in the surrounding environment. The low-temperature material in the expander requires good plasticity, a tough-brittle transition temperature lower than the use temperature, strength that meets the design requirements, good processing formability, and low cold shrinkage. At present, the low-temperature part of the expander is mainly made of stainless steel, aluminum and copper alloy. The parts connecting the low-temperature turbine volute and the normal-temperature fuselage of the expander must have very low thermal conductivity, good machinability and certain strength. In the past, non-metallic materials were not dense and strong enough, and were easily brittle. Gases also easily seeped out of the materials, and the surface finish after processing did not meet the design requirements, so stainless steel materials were generally used. Since the operating speed of the expander is very high, in order to improve the rigidity and critical speed of the expander rotor, the extension end of the bearing is very short, which shortens the distance for the low-temperature gas at the turbine end to conduct heat through the body of the machine, strengthens the heat exchange with the atmosphere, and causes frost and ice on the surface of the fuselage. At the same time, due to the platinum thermal resistor as a measuring point, it is inserted into the inner hole of the bearing through a slender stainless steel measuring rod, and the head of the measuring rod is as close to the inner hole of the bearing as possible, so that the measured temperature is as accurate as possible. However, since the tail of the platinum resistance thermometer is a relatively large terminal, the turbine end of the fuselage cannot be completely loaded into the cold-keeping box. When the expander is working, the cold energy of the low-temperature gas is transferred to the fuselage due to heat conduction, causing cold loss of the equipment. More importantly, after the atmosphere contacts the low-temperature fuselage, frost and ice will form, which seriously affects the appearance of the equipment and easily causes users to worry about the safety of the expander operation, and even causes users to refuse to accept the performance of the equipment.

[0035] To solve this problem, the best way is to improve and optimize the structure, improve the material of parts, and reduce the transfer of cold as much as possible. The positioning plate of the conventional adjustable nozzle adopts an integrated structure and is made of stainless steel. It is first connected to the low-temperature turbine volute by screws, and then connected to the fuselage at normal temperature by screws. Its inner hole and end face are in contact with the outer circle and end face of the fuselage respectively, which causes the cold to be directly transferred to the fuselage, causing the fuselage to freeze quickly. At the same time, the front partition is generally made of stainless steel. Its left end face is in direct contact with the low-temperature gas behind the nozzle, and its right end face is in contact with the fuselage. This also causes a large amount of cold to be transferred to the fuselage, causing frost and ice on the outer surface of the fuselage.

[0036] After structural optimization and cooperation with material manufacturers, the strength, density and processing accuracy of the insulating material - epoxy glass cloth board have been improved, and heat conduction can be reduced through three channels. First, the positioning plate of the adjustable nozzle can be divided into two parts. The part in contact with the nozzle blade is the positioning plate, which is still made of stainless steel. The part in contact with the fuselage is called the positioning pressure plate, and its material is changed to epoxy glass cloth board. When the adjustable nozzle is working, there is a high-speed low-temperature (<-120℃) airflow in the nozzle blade. Considering that stainless steel can withstand -196℃~+800℃, and considering that the strength of stainless steel is about 2 times higher than that of epoxy glass cloth board, and the wear resistance and surface processing finish are higher, the left part of the positioning plate in contact with the blade is still made of stainless steel. Since the right part of the positioning plate is not in direct contact with the low-temperature gas, its working temperature is higher than -120℃. The epoxy glass cloth board can withstand -120℃~+170℃, so the right part of the positioning plate - the positioning pressure plate can be made of epoxy glass cloth board material. The color of the usual epoxy glass cloth board is yellow. By adding glass fiber to the epoxy glass cloth board, the color becomes aqua green, and the strength and hardness are improved. As a structural part, the epoxy glass cloth board is a very good insulation material. Through the structural improvement of the positioning plate, not only the installation weight of the adjustable nozzle is reduced, but also the heat transfer is greatly reduced. The positioning plate and the positioning pressure plate are connected by screws. The front partition between the expansion wheel and the bearing is also made of epoxy glass cloth board, and the insulation board between the turbine volute and the bracket vertical plate is also made of epoxy glass cloth board; secondly, the gasket of epoxy glass cloth board is added to the screw end face connecting the fuselage and the positioning pressure plate; finally, the gasket of epoxy glass cloth board is also added to the screw end face connecting the turbine volute and the bottom frame vertical plate; after the above three-pronged structural improvement, the materials of the low temperature of the expander and the connection part of the fuselage are all isolated by epoxy glass cloth board with very low thermal conductivity, which can minimize the transfer of cold and basically achieve the purpose of not freezing the cold end of the expander fuselage. When the positioning plate of the adjustable nozzle is made of stainless steel, its density is 7900kg / m3, while when the epoxy glass cloth plate is used, its density is 1800kg / m3, which is 77% less than the original weight. At present, the maximum weight of the adjustable nozzle parts of our company does not exceed 100 kg, which exceeds the maintenance weight of one worker. By changing the structure of the nozzle positioning plate, the weight of the entire adjustable nozzle part can be controlled within 55 kg, which is within the maintenance weight that one worker can carry, which facilitates installation and disassembly and improves the economy of assembly.

[0037] The characteristics of the new structure after the positioning plate structure is improved are that the stainless steel material has high strength, low thermal conductivity, the specific value is ~20W / (m.℃), and good low temperature performance. The thermal conductivity of the epoxy glass cloth board is small, the specific value is ~1W / (m.℃), only about 5% of that of stainless steel, which reduces the heat transfer. The original disadvantage of the epoxy glass cloth board is that the material has poor density, the surface finish after processing and the connection accuracy of the thread are not high. At the same time, because it is made of epoxy glass cloth paper bonded layer by layer with glue, and then pressed and dried by a press, the density of its surface is not too high, and the low-temperature cold air may leak out from the inner hole of the epoxy glass cloth board through the material. In order to prevent the above phenomenon from happening, it is necessary to purchase high-quality epoxy glass cloth boards according to the size of the positioning platen for manufacturing. Generally, a certain amount of glass fiber is added to the conventional epoxy glass cloth board to improve its strength and wear resistance. The manufactured positioning platen is first tested for air tightness at room temperature with a pressure not exceeding 1.6MPa for one hour in the company, with no leakage and no deformation as the qualified standard, and then tested for air tightness at low temperature with a pressure not exceeding 1.0MPa for one hour, with no leakage and no deformation as the qualified standard. Through communication with the supplier of epoxy glass cloth board, the higher the tonnage of the hydraulic press of epoxy glass cloth board, the greater the density and the better the density, so a large-tonnage hydraulic press must be used to manufacture the epoxy glass cloth board at the turbine end. Through joint efforts with the supplier of epoxy glass cloth board materials, the positioning platen with epoxy glass cloth board as the material required for the design was successfully obtained. The epoxy glass cloth board pressed by the super-large-tonnage hydraulic press has a surface accuracy and strength that fully meets the design requirements after processing. After a long period of air pressure test, no leakage occurs, which can fully meet the density requirements.

[0038] Through the improvement of the design structure of the oil bearing turbine expander mentioned above, not only the problem of cold end of the expander running out of heat is solved, but also the phenomenon of frost and ice formation in the cold storage box of the expander is eliminated, which can meet the user's satisfaction with the operation of the expander and can quickly pass the acceptance of the equipment; at the same time, the loss of running out of heat is reduced, and the efficiency of the expander is at least improved by more than 1%, which is equivalent to saving more than 0.5kW of power, and at least 4,400 degrees of electricity can be saved in a year, which improves the economic benefits. The maintenance weight of the adjustable nozzle components of the conventional structure exceeds the tolerance of a worker. Each time the maintenance and replacement is carried out, an air crane must be hired. The cost of each air crane is about 10,000 yuan, and it takes time to wait for the crane to enter the maintenance site, which increases the maintenance cost. By changing the material of the nozzle positioning plate from stainless steel to epoxy glass cloth board, the installation weight of the adjustable nozzle component can be optimized from a work that one worker cannot assemble alone to one worker can assemble and disassemble the adjustable nozzle alone, saving maintenance costs and time. In summary, the optimization and improvement of the expander structure has improved the brand reputation of Suyang Company's expanders, enhanced the competitiveness of complete sets of air separation products, and also improved the overall level of my country's expanders.

[0039] It should be noted that, in this article, relational terms such as first and second (number one, number two), etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "including one..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0040] The above shows and describes the basic principle and main features of the utility model and the advantages of the utility model. The technicians in this industry should understand that the utility model is not limited by the above embodiments, and the above embodiments and descriptions are only for explaining the principle of the utility model. Without departing from the spirit and scope of the utility model, the utility model will have various changes and improvements, and these changes and improvements fall within the scope of the utility model to be protected.

Claims

1. A structure for effectively reducing the cooling of oil bearings of a turbine expander, comprising a body (1), characterized in that: The front end of the fuselage (1) is connected to an expander inlet pipe (20) and an expander outlet pipe (19), the rear end of the fuselage (1) is connected to a first supercharger inlet pipe (3) and a second supercharger inlet pipe (8), and the middle of the fuselage (1) is provided with an adjustable nozzle (14), a positioning plate (15), a heat insulation plate (13), a heat insulation pad (12), a front bearing (11), a front sealing cover (21), a front sealing sleeve (22), an epoxy glass cloth plate pressure plate (23) and a front partition plate (24).

2. The structure for effectively reducing the cooling of oil bearing turbine expander according to claim 1, characterized in that: The adjustable nozzle (14) comprises a positioning screw (25), a positioning pressure plate (26), a plate body (27), a cover plate (28), a pin (29), a positioning sleeve (30), a clamping screw (31), a first nut (32), a sliding plate (33), a second nut (34), a rotating blade (35), a screw assembly (36), a spring (37) and a gasket (38), wherein the positioning screw (25) is located on the plate body (27), the pin (29) is located on the first nut (32), and the clamping screw (31) and the second nut (34) are located on the sliding plate (33).

3. The structure for effectively reducing the cooling of oil bearing turbine expander according to claim 1, characterized in that: The expander inlet pipe (20), the expander outlet pipe (19), the first supercharger inlet pipe (3) and the second supercharger inlet pipe (8) are all provided with temperature monitoring sensors (40) inside, and the inner wall surfaces of the expander inlet pipe (20), the expander outlet pipe (19), the first supercharger inlet pipe (3) and the second supercharger inlet pipe (8) are all integrally formed with sealing insulation sheets (39).

4. The structure for effectively reducing the cooling of oil bearings in a turbine expander according to claim 1, characterized in that: An end cover (16), a turbine volute (17) and a diffusion chamber (18) are installed at the bottom of the expander outlet pipe (19).

5. The structure for effectively reducing the cooling of oil bearings in a turbine expander according to claim 1, characterized in that: The rear end of the fuselage (1) is provided with a boost end sealing air inlet (2), a booster volute (5), a rear sealing cover (6), a rotor (7), a rear sealing sleeve (4), a rear partition (9) and a rear bearing (10); the rear bearing (10) is positioned on the rear partition (9) and is fixed between the booster volute (5) and the rear sealing cover (6).

6. The structure for effectively reducing the cooling of oil bearings in a turbine expander according to claim 1, characterized in that: Nitrogen is produced between the expander inlet pipe (20), the expander outlet pipe (19) and the fuselage (1), and multiple groups of epoxy glass cloth plate pressure plates (23) are arranged on the outside for sealing and heat preservation.

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