A working medium self-cooling structure for an organic Rankine cycle totally-enclosed turbo-generator set and a totally-enclosed turbo-generator

Abstract

This invention discloses a self-cooling structure for an organic Rankine cycle fully enclosed turbine generator set and a fully enclosed turbine generator, including a casing, a stator, and a cooling cylinder with an interference fit between the stator and the casing. The outer wall of the cooling cylinder has an inlet groove, and a working fluid pump is connected to the working fluid inlet in the casing to allow the working fluid to enter the inlet groove. The inner wall of the cooling cylinder has multiple circumferential cooling grooves. The working fluid enters the circumferential cooling grooves through the inlet groove and inlet hole, and the working fluid gas generated after absorbing heat and vaporizing is collected in the gas collection groove of the cooling cylinder. One end of the gas pipeline is connected to the gas collection groove, and the other end is connected between the bearing and the stator, using the working fluid gas to cool the bearing and rotor. After operation, the working fluid and working fluid gas enter the condenser through the working fluid outlet and exhaust port of the casing, respectively, and the connecting pipelines to the working fluid outlet and exhaust port. This invention has the advantages of zero external leakage, effectively improving heat dissipation, and ensuring that the unit can operate stably for a long time within the allowable temperature range.

Description

Technical Field

[0001] This invention belongs to the field of generator technology, specifically a working fluid self-cooling structure for an organic Rankine cycle fully enclosed turbine generator set and a fully enclosed turbine generator. Background Technology

[0002] Organic Rankine Cycle (ORC) power generation technology, as a key core technology for the utilization of low- and medium-grade energy sources, is particularly suitable for applications such as geothermal power generation, low- and medium-temperature waste heat power generation, and LNG cold energy power generation. This power generation technology not only completely eliminates the consumption of fossil fuels but also effectively reduces energy waste in various industrial processes. Therefore, vigorously developing ORC power generation technology will help reduce carbon emissions and promote the creation of a resource-saving and environmentally friendly harmonious society.

[0003] Because it uses refrigerants and low-boiling-point, highly volatile organic working media such as alkanes, leakage control is one of the core aspects of Organic Rankine Cycle (ORC) power generation technology and a key indicator for evaluating the success or failure of a project. In the entire ORC power generation system, the shaft end seals of moving equipment such as the turbine expander and generator represent the greatest challenge in leakage control.

[0004] Conventional Organic Rankine Cycle (ORC) power generation systems employ a "sliding bearing + mechanical seal" configuration to achieve bearing-rotor lubrication and shaft end sealing. This includes a lubrication oil system and a sealing oil system, which control the leakage of the working fluid within a certain range.

[0005] The novel Organic Rankine Cycle (ORC) power generation system employs a fully enclosed integrated turbine generator set, using electromagnetic bearings instead of sliding bearings. Furthermore, due to the turbine generator set's "capsule-type" fully enclosed integrated structure, there are no shaft end seals (such as mechanical seals), lubrication systems, or sealing oil systems. The generator also utilizes organic working fluid for "self-cooling," eliminating the need for external cooling (such as air cooling or water cooling), truly achieving zero leakage of the organic working fluid. Figure 1 As shown, its main working process is as follows: the working fluid pump P transports the liquid organic working fluid in the condenser C to the evaporator V, where it is heated and evaporated into a gaseous working fluid. The gaseous working fluid then flows into the turbine expander T to do work, driving the generator G to rotate and generate electricity for the grid. After that, the gaseous working fluid returns to the condenser C and condenses into a liquid state, completing the entire power generation cycle.

[0006] The biggest technical challenge of fully enclosed integrated turbine generator sets is that the power generation system does not have a low-temperature, gaseous organic working fluid that can be directly used for the generator's "self-cooling". In actual use, due to the lack of external cooling (such as air cooling, water cooling, etc.), problems such as overheating and unstable operation will occur. Therefore, it is necessary to further improve the existing fully enclosed integrated turbine generator sets.

[0007] To address the aforementioned problems, this invention introduces liquid working fluid (working fluid liquid) into generator G via pipeline i of working fluid pump P. This liquid absorbs heat from the stator and partially vaporizes within the generator casing for rotor and bearing cooling. Subsequently, the gaseous working fluid (working fluid gas) and liquid working fluid (working fluid liquid) are discharged to condenser C via pipelines k and j, respectively. This invention achieves zero external leakage and effectively improves heat dissipation, ensuring long-term stable operation of the unit within the permissible temperature range. Summary of the Invention

[0008] The purpose of this invention is to address the shortcomings of existing technologies by providing a self-cooling structure for the working fluid and a fully enclosed turbine generator for an organic Rankine cycle fully enclosed turbine generator set that achieves zero external leakage, effectively improves heat dissipation, and ensures long-term stable operation of the unit within the allowable temperature range.

[0009] The technical objective of this invention is achieved through the following technical solution:

[0010] A self-cooling structure for an organic Rankine cycle fully enclosed turbine generator set includes a casing, a stator, and a cooling cylinder disposed between the stator and the casing. The inner and outer walls of the cooling cylinder are interference-fitted with the outer wall of the stator and the inner wall of the casing, respectively. An inlet groove is provided on the upper side of the outer wall of the cooling cylinder, and the casing has a working fluid inlet corresponding to the inlet groove to guide external working fluid into the inlet groove. The working fluid inlet is connected to a working fluid pump via a pipeline. The inner wall of the cooling cylinder has multiple axially spaced circumferential cooling grooves. An inlet hole is provided in each circumferential cooling groove corresponding to the inlet groove to guide the working fluid into the circumferential cooling groove. The bottom side of the inner wall of the cooling cylinder has an axially oriented collection groove that connects to all the circumferential cooling grooves. The collection groove is used to collect the working fluid that has already undergone cooling. The collection groove has a drain hole to discharge the working fluid. Corresponding to the drain hole, the casing has a working fluid pump... The cooling cylinder has a liquid outlet; the cooling cylinder has an axially oriented gas collection groove on its inner wall that connects to all circumferential cooling grooves; the outer wall of the cooling cylinder also includes a working gas outlet for discharging working gas, a working gas inlet for introducing working gas, and a gas pipeline connecting the working gas outlet and the working gas inlet; the housing has a housing working gas outlet and a housing working gas inlet corresponding to the working gas outlet and the working gas inlet, respectively, for the two ends of the gas pipeline to pass through; the working gas outlet is connected to the gas collection groove, and the working gas generated by the working liquid absorbing heat and vaporizing when cooling the stator is discharged through the working gas outlet; the working gas inlet is located between the bearing and the stator, and is used to introduce the working liquid vapor into the axial gap between the bearing and the stator; the housing has exhaust ports at both axial ends for discharging gas, and the exhaust ports and the working liquid outlet are respectively connected to the condenser through pipelines.

[0011] Preferably, the gas collecting tank and the liquid inlet tank are arranged vertically correspondingly, and the width of the gas collecting tank is greater than the width of the liquid inlet tank.

[0012] Preferably, the gas collecting tank and the liquid collecting tank divide the circumferential cooling tank into two symmetrically arranged arc-shaped cooling tanks; corresponding to the arc-shaped cooling tanks, the liquid inlet tank is provided with two sets of liquid inlet holes.

[0013] Preferably, the axial length of the cooling cylinder is greater than the axial length of the stator, and the circumferential cooling grooves on the inner wall of the cooling cylinder are evenly distributed along the axial direction on the outer surface of the stator.

[0014] Preferably, the working fluid is an organic working fluid that is the same as the turbine working medium.

[0015] Preferably, the housing is further provided with an air inlet for introducing air into the turbine expander.

[0016] A fully enclosed turbine generator includes the working fluid self-cooling structure for an organic Rankine cycle fully enclosed turbine generator set as described in any one of the above.

[0017] Compared with the prior art, the beneficial effects of the present invention are:

[0018] 1. The organic Rankine cycle fully enclosed turbine generator set of the present invention features a self-cooling structure for the working fluid, allowing the working fluid liquid and working fluid gas to circulate within the casing, cooling cylinder, gas pipelines, condenser, and working fluid pump, preventing leakage to the external environment. This design not only avoids environmental pollution from the organic working fluid but also prevents external impurities from entering the system, improving system reliability and safety. The fully enclosed circulation system reduces working fluid loss, ensures efficient recycling of the working fluid, and lowers operating costs. Simultaneously, the internal pressure and flow rate are more stable, preventing system performance fluctuations caused by working fluid leakage. The multi-stage cooling method effectively absorbs the heat generated by the stator, ensuring the stator temperature remains within a reasonable range and preventing insulation aging and performance degradation due to high temperatures. The fluidity of the gaseous working fluid is used to cool the rotor and bearings. This cooling method effectively reduces the temperature of the rotor and bearings, slows lubricant degradation, and extends bearing life. This technology offers the advantages of zero external leakage, effectively improving heat dissipation, and ensuring long-term stable operation of the unit within the permissible temperature range.

[0019] 2. The fully enclosed turbine generator of the present invention significantly improves cooling efficiency, system stability and reliability by integrating a self-cooling structure for the working fluid of the organic Rankine cycle fully enclosed turbine generator set, while simplifying the structure and reducing operating costs. At the same time, it can significantly improve the performance and service life of the turbine generator. Attached Figure Description

[0020] Figure 1 Flowchart of an Organic Rankine Cycle (ORC) power generation system;

[0021] Figure 2 This is a schematic diagram of the structure of the fully enclosed turbine generator of the present invention;

[0022] Figure 3 yes Figure 2 Schematic diagram of the intermediate cooling cylinder;

[0023] Figure 4 yes Figure 3 A cross-sectional view of the intermediate cooling cylinder (AA section);

[0024] Figure 5 yes Figure 3 BB cross-sectional view of the intermediate cooling cylinder;

[0025] Figure label:

[0026] 1—Casing; 11—Middle section of casing; 12—Bearing section; 13—Turbine impeller section; 14—Closed end cover;

[0027] 111—Working fluid inlet; 112—Working fluid outlet; 113—Working fluid gas outlet of the casing; 114—Working fluid gas inlet of the casing; 115—Exhaust port; 116—Air inlet;

[0028] 2—Cooling cylinder; 21—Liquid inlet tank; 22—Liquid inlet hole; 23—Circular cooling tank; 231—First arc-shaped cooling tank; 232—Second arc-shaped cooling tank;

[0029] 24—Liquid collecting tank; 241—Drain hole; 25—Gas collecting tank; 26—Working gas outlet; 27—Working gas inlet; 28—Bearing positioning groove;

[0030] 3—Stator;

[0031] 4—Gas piping;

[0032] 51—Left bearing; 52—Right bearing;

[0033] 6—Rotor body; 61—Left shaft; 62—Right shaft;

[0034] 71—Left turbine impeller; 72—Right turbine impeller. Detailed Implementation

[0035] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0036] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0037] It should be noted that similar reference numerals and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures. Furthermore, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0038] Example 1

[0039] like Figures 1-5 As shown, a self-cooling structure for working fluid in an organic Rankine cycle fully enclosed turbine generator set includes a housing 1, a stator 3, and a cooling cylinder 2 disposed between the stator 3 and the housing 1. The inner and outer walls of the cooling cylinder 2 are respectively interference-fitted to the outer wall of the stator 3 and the inner wall of the housing 1. A liquid inlet 21 is provided on the upper side of the outer wall of the cooling cylinder 2, and the housing 1 is provided with a working fluid inlet 111 corresponding to the liquid inlet 21 to introduce external working fluid liquid into the liquid inlet 21. The working fluid inlet 111 is connected to the working fluid via a pipe i. Pump P; the inner wall of the cooling cylinder 2 has multiple axially spaced circumferential cooling grooves 23; the liquid inlet groove 21 is provided with a liquid inlet hole 22 corresponding to the circumferential cooling grooves 23 to guide the working fluid into the circumferential cooling grooves 23; the bottom side of the inner wall of the cooling cylinder 2 has a liquid collection groove 24 that is axially opened and connects all the circumferential cooling grooves 23, the liquid collection groove 24 is used to collect the working fluid that has participated in the cooling operation; the liquid collection groove 24 is provided with a drain hole 241 to discharge the working fluid, and corresponding to the drain hole 241, the casing 1 is provided with a working fluid pump. The liquid outlet 112; the cooling cylinder 2 has a gas collecting groove 25 on its inner wall that is axially opened and connects all the circumferential cooling grooves 23; the outer wall of the cooling cylinder 2 also includes a working gas outlet 26 for discharging working gas, a working gas inlet 27 for introducing working gas, and a gas pipeline 4 connecting the working gas outlet 26 and the working gas inlet 27; the housing 1 has a housing working gas outlet corresponding to the working gas outlet 26 and the working gas inlet 27, into which the two ends of the gas pipeline 4 pass. 113 and the housing working gas inlet 114; the working gas outlet 26 is connected to the gas collecting groove 25, and the working gas generated by the working liquid absorbing heat and vaporizing when cooling the stator 3 is discharged through the working gas outlet 26; the working gas inlet 27 is set between the bearing and the stator 3, and is used to introduce the working gas into the gap between the bearing and the stator 3; the housing 1 has exhaust ports 115 at both axial ends for discharging gas; the exhaust ports 115 and the working liquid outlet 112 are respectively connected to the condenser C through pipelines.

[0040] In practical use, the working fluid pump P is connected to the working fluid inlet 111 of the generator housing 1 via pipeline i, introducing liquid working fluid (working fluid liquid) into the housing 1. The working fluid liquid sequentially passes through the inlet tank 21 and inlet hole 22 on the cooling cylinder 2 and is introduced into the circumferential cooling tank 23. The working fluid liquid absorbs heat from the stator 3 and forms a small amount of working fluid vapor (working fluid gas) in the cooling cylinder 2 due to heat absorption and vaporization. The working fluid gas is introduced through the gas pipeline 4 into the axial gap between the stator 3 and the bearing. The working fluid gas flows along the gap between the bearing and the stator 3, and between the bearing and the rotor, toward the exhaust port 115 of the housing 1, achieving the effect of cooling the rotor and the bearings on the left and right sides. The working fluid then collects in the collection tank 24 and is discharged into the condenser C via the drain hole 241, the working fluid outlet 112, and pipeline j. After cooling the rotor and bearings, the working gas is discharged into the condenser C via the exhaust port 115 on the casing 1 and pipeline k. The condenser C is connected to the working fluid pump P via pipeline. Due to the fully enclosed structure, the working fluid and working gas circulate within the casing 1, cooling cylinder 2, gas pipeline 4, condenser C, and working fluid pump P, preventing leakage to the external environment. This design not only avoids environmental pollution from organic working fluids but also prevents external impurities from entering the system, improving system reliability and safety. The fully enclosed circulation system reduces working fluid loss, ensures efficient recycling of the working fluid, and lowers operating costs. Simultaneously, the internal pressure and flow rate are more stable, avoiding system performance fluctuations caused by working fluid leakage. Multi-stage cooling effectively absorbs the heat generated by stator 3, ensuring its temperature remains within a reasonable range and preventing insulation aging and performance degradation caused by high temperatures. The flowability of the gaseous working fluid is utilized to cool the rotor and bearings. This cooling method effectively reduces the temperature of the rotor and bearings, slows lubricant degradation, and extends bearing life. This technology offers the advantages of zero external leakage, significantly improved heat dissipation, and ensures long-term stable operation of the unit within the permissible temperature range.

[0041] like Figure 2 As shown, the inner and outer walls of the cooling cylinder 2 are interference-fitted with the outer wall of the stator 3 and the inner wall of the housing 1, respectively. This interference fit effectively reduces the gap between the cooling cylinder 2 and the stator 3 and housing 1, thereby improving sealing performance. It prevents the working fluid and working gas from leaking into the external environment during cooling, and also avoids external impurities entering the cooling system, ensuring reliable system operation. The interference fit also reduces the contact thermal resistance between the cooling cylinder 2 and the stator 3 and housing 1. This close contact allows heat to be transferred more efficiently from the stator 3 to the working fluid inside the cooling cylinder 2, thus improving the heat transfer efficiency of the cooling system and further enhancing the cooling effect on the stator 3.

[0042] like Figures 2-5As shown, the gas collecting groove 25 of the cooling cylinder 2 is arranged vertically opposite to the liquid inlet groove 21, and the width of the gas collecting groove 25 is greater than the width of the liquid inlet groove 21. This wider design provides more space for the vaporization of the working fluid. After absorbing heat, the working fluid partially vaporizes, and the resulting working fluid vapor can be smoothly discharged through the gas collecting groove 25. The larger width of the gas collecting groove 25 helps reduce the resistance of the working fluid vapor, allowing it to be discharged more smoothly and further improving cooling efficiency.

[0043] like Figure 3 , Figure 5 As shown, the gas collecting tank 25 and the liquid collecting tank 24 divide the circumferential cooling tank 23 into two symmetrically arranged arc-shaped cooling tanks; corresponding to the arc-shaped cooling tanks, the liquid inlet tank 21 is provided with two sets of liquid inlet holes 22. In this embodiment, the gas collecting tank 25 and the liquid collecting tank 24 divide the circumferential cooling tank 23 into a first arc-shaped cooling tank 231 and a second arc-shaped cooling tank 232, which are symmetrically arranged. By providing two sets of liquid inlet holes 22 in the liquid inlet tank 21, the working fluid can be more evenly distributed into the two sets of arc-shaped cooling tanks. This design can prevent the coolant from concentrating in a certain area, thereby ensuring a more uniform distribution of coolant around the entire stator 3 and improving cooling efficiency.

[0044] like Figure 2 As shown, the housing 1 is a sealed shell structure formed by the housing middle section 11, the bearing section 12, the turbine impeller section 13, and the closed end cover 14. The housing 1 has a symmetrical structure. The cooling cylinder 2 is interference-fitted to the inner wall of the housing middle section 11. The left bearing section and the right bearing section are symmetrically connected to the left and right sides of the housing middle section 11. The left turbine impeller section is connected to the left side of the left bearing section, and the left closed end cover with a closed left opening is connected to the left side of the left turbine impeller section. The right turbine impeller section is connected to the right side of the right bearing section, and the right closed end cover with a closed right opening is connected to the right side of the right turbine impeller section. Exhaust ports 115 are respectively provided on the left and right closed end covers.

[0045] like Figure 2 As shown, the stator 3, turbine impeller, rotor, and bearings are sealed within the housing 1. The bearings include a symmetrically arranged left bearing 51 and a right bearing 52, which are respectively interference-fitted into bearing positioning grooves 28 at both axial ends of the cooling cylinder 2. In actual use, electronic bearings can be used. The axial ends of the stator 3 are spaced apart from the right side of the left bearing 51 and the left side of the right bearing 52, respectively. The rotor includes a rotor body 6 and symmetrically arranged left and right rotating shafts 61 and 62 at both axial ends of the rotor body 6. A left turbine impeller 71 and a right turbine impeller 72 are respectively mounted on the left and right rotating shafts 61 and 62. The right side of the left turbine impeller 71 is spaced apart from the left side of the left bearing 51, and the left side of the right turbine impeller 72 is spaced apart from the right side of the right bearing 52.

[0046] like Figure 2As shown, the casing 1 is also provided with an air inlet 116 for introducing the turbine expander's intake air. In a specific implementation, the turbine expander T is connected to the air inlet 116 via a pipe, and the air inlet 116 is used to introduce the turbine expander's intake air. The left turbine impeller section and the right turbine impeller section of the casing 1 are respectively provided with air inlets 116 for introducing the turbine expander's intake air. The turbine expander's intake air introduced through the air inlet 116 is collected with the working fluid gas and discharged to the condenser C through the exhaust port 115. This technology, which collects the turbine expander's intake air and the working fluid vapor and discharges them together, makes the flow of the working fluid vapor more stable. The pressure fluctuations generated by the working fluid vapor during the cooling process can be balanced by collecting and discharging, reducing system instability caused by changes in the working fluid vapor pressure. Since the working fluid vapor is directly discharged to the condenser C through the exhaust port 115, the residence time and flow path of the working fluid vapor in the system are reduced, lowering the risk of leakage due to loose or damaged pipe connections. This fully enclosed design ensures the safe and efficient flow of the working fluid vapor within the system, improving system reliability.

[0047] like Figure 2 As shown, the axial length of the cooling cylinder 2 is greater than the axial length of the stator 3, and the circumferential cooling grooves 23 on the inner wall of the cooling cylinder 2 are evenly distributed axially on the outer surface of the stator 3. The greater axial length of the cooling cylinder 2 allows it to completely cover the outer surface of the stator 3. This ensures that heat is effectively absorbed and dissipated throughout the entire axial length of the stator 3, avoiding overheating due to insufficient local cooling. Simultaneously, it results in a larger contact area between the cooling cylinder 2 and the stator 3. A larger contact area means that the working fluid can more fully absorb the heat generated by the stator 3, thereby improving cooling efficiency.

[0048] The circumferential cooling tanks 23 are uniformly distributed along the axial direction, allowing the working fluid to flow evenly through all parts of the stator 3, absorbing heat and vaporizing. This cooling method effectively avoids thermal stress caused by localized overheating of the stator 3, extending its service life; it also reduces thermal stress caused by uneven temperature gradients. Thermal stress is one of the important factors leading to material fatigue and damage in the stator 3, and this design effectively reduces thermal stress, extending the service life of the stator 3. The uniform cooling effect and optimized working fluid flow path make the entire cooling system more stable during operation, reducing vibration and noise caused by uneven coolant flow or localized overheating, and improving the system's operational stability.

[0049] The working fluid is the same organic working medium as the turbine. In practice, using the same working fluid avoids introducing foreign matter into the ORC circulation system, ensuring the purity of the working fluid and circulation efficiency. The heat absorbed during the cooling process can be returned to the ORC system for reuse along with the working fluid, improving overall thermal efficiency. No separate cooling medium storage and transportation system is needed, reducing equipment complexity and maintenance costs.

[0050] Working principle of the invention:

[0051] Generator stator 3 cooling:

[0052] The working fluid is a low-temperature liquid organic working fluid. This low-temperature liquid organic working fluid is pumped by the working fluid pump P through pipe i and the working fluid inlet 111 of the housing 1 into the inlet tank 21 on the upper side of the outer wall of the cooling cylinder 2. After collecting in the inlet tank 21, it enters each of the circumferential cooling tanks 23 through numerous inlet holes 22. The working fluid flows from top to bottom along the outer surface of the generator stator 3 within each circumferential cooling tank 23, thereby cooling the generator stator 3. After cooling the stator 3 of the generator G, most of the working fluid collects in the collection tank 24 on the bottom side of the inner wall of the cooling cylinder 2, and is discharged into the condenser C sequentially through the drain hole 241 of the cooling cylinder 2, the working fluid outlet 112 of the housing 1, and the pipe j connected to the working fluid outlet 112.

[0053] Generator rotor and bearing cooling:

[0054] After the working fluid cools the stator 3 of the generator, most of it collects in the liquid collection tank 24 of the cooling cylinder 2. A small portion of the working fluid absorbs heat and vaporizes to form working fluid gas (working fluid vapor). The working fluid gas rises along the circumferential cooling tank 23 to the gas collection tank 25 on the upper side of the inner wall of the cooling cylinder 2. The working fluid gas then flows sequentially through the working fluid gas outlet 26, gas pipeline 4, and working fluid gas inlet 27, which are connected to the gas collection tank 25, into the axial gap between the bearing and the stator 3. The working fluid gas further flows along the gap between the bearing and the rotor to the exhaust port 115 of the housing 1, achieving the effect of cooling the rotor and the bearings on both sides. After operation, the working fluid gas mixes with the intake air of the turbine expander and is discharged to the condenser C through the exhaust port 115 on the housing 1 and the pipeline k connected to the exhaust port 115.

[0055] Example 2

[0056] The other contents of this embodiment are the same as those of embodiment 1, except that this embodiment is a fully enclosed turbine generator, including the working fluid self-cooling structure of the organic Rankine cycle fully enclosed turbine generator set in embodiment 1.

[0057] The fully enclosed turbine generator, combined with the self-cooling structure of the working fluid in Example 1, forms a completely enclosed structure, preventing leakage of the working fluid liquid and vapor to the external environment and effectively cooling the motor. This design not only avoids environmental pollution from organic working fluids but also prevents external impurities from entering the motor, improving system reliability and safety. The cooling cylinder 2 is connected to the stator 3 and housing 1 via an interference fit, fully utilizing the internal space of the generator set. This integrates the entire cooling system with the generator set, resulting in a compact structure, reduced external piping and connecting components, and lower system complexity and failure rate. The optimized working fluid flow path and fully enclosed circulation system reduce the loss of working fluid liquid and vapor, decreasing the frequency of working fluid replenishment and reducing operating costs. The cooling system can automatically adjust the flow rate and vaporization of the working fluid liquid according to the generator set's operating status, ensuring that the temperature of components such as the stator 3, rotor, and bearings remains within a reasonable range, improving system operational stability.

[0058] In summary, this fully enclosed turbine generator, by integrating an organic Rankine cycle fully enclosed turbine generator set with a self-cooling structure for the working fluid, significantly improves cooling efficiency, system stability, and reliability, while simplifying the structure, reducing operating costs, and significantly improving the performance and service life of the turbine generator.

[0059] The technical solutions provided by the embodiments of the present invention have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of the embodiments of the present invention. The descriptions of the embodiments above are only for helping to understand the principles of the embodiments of the present invention. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the embodiments of the present invention. Therefore, the content of this specification should not be construed as a limitation of the present invention.

Claims

1. A self-cooling structure for working fluid in an organic Rankine cycle fully enclosed turbine generator set, characterized in that, It includes a housing, a stator, and a cooling cylinder disposed between the stator and the housing; the inner wall and outer wall of the cooling cylinder are respectively interference-fitted with the outer wall of the stator and the inner wall of the housing; The upper side of the outer wall of the cooling cylinder is provided with a liquid inlet groove, and the housing is provided with a working liquid inlet corresponding to the liquid inlet groove to introduce the external working liquid into the liquid inlet groove; the working liquid inlet is connected to a working liquid pump through a pipeline. The inner wall of the cooling cylinder has multiple circumferential cooling grooves spaced apart along the axial direction; The inlet tank is provided with an inlet hole corresponding to the circumferential cooling tank to guide the working fluid into the circumferential cooling tank; The bottom side of the inner wall of the cooling cylinder has a liquid collection tank that is axially opened and connects all the circumferential cooling tanks. The liquid collection tank is used to collect the working liquid that has participated in the cooling process. The liquid collection tank is provided with a drain hole to discharge the working liquid. Corresponding to the drain hole, the casing is provided with a working liquid outlet. The cooling cylinder has an axially opening gas collection groove on its inner wall upper side that connects all circumferential cooling grooves; The outer wall of the cooling cylinder also includes a working gas outlet for discharging working gas, a working gas inlet for introducing working gas, and a gas pipeline connecting the working gas outlet and the working gas inlet. The casing is provided with a working gas outlet and a working gas inlet, respectively, for the gas pipeline to pass through at both ends. The working gas outlet is connected to the gas collection tank, and the working gas generated by the working liquid absorbing heat and vaporizing when cooling the stator is discharged through the working gas outlet. The working gas inlet is located between the bearing and the stator, and is used to introduce working gas into the axial gap between the bearing and the stator; The housing is provided with exhaust ports at both axial ends for discharging gas; The exhaust port and the working liquid outlet are respectively connected to the condenser through pipelines.

2. The self-cooling structure for working fluid in an organic Rankine cycle fully enclosed turbine generator set according to claim 1, characterized in that, The gas collecting tank and the liquid inlet tank are arranged vertically and vertically, and the width of the gas collecting tank is greater than the width of the liquid inlet tank.

3. The self-cooling structure for working fluid in an organic Rankine cycle fully enclosed turbine generator set according to claim 1 or 2, characterized in that, The gas collection tank and liquid collection tank divide the circumferential cooling tank into two symmetrically arranged arc-shaped cooling tanks; corresponding to the arc-shaped cooling tanks, the liquid inlet tank is provided with two sets of liquid inlet holes.

4. The self-cooling structure for working fluid in an organic Rankine cycle fully enclosed turbine generator set according to claim 1, characterized in that, The axial length of the cooling cylinder is greater than the axial length of the stator, and the circumferential cooling grooves on the inner wall of the cooling cylinder are evenly distributed along the axial direction on the outer surface of the stator.

5. The self-cooling structure for working fluid in an organic Rankine cycle fully enclosed turbine generator set according to claim 1, characterized in that, The working fluid is the same organic working fluid as the turbine working medium.

6. The self-cooling structure for working fluid in an organic Rankine cycle fully enclosed turbine generator set according to claim 1, characterized in that, The housing is also provided with an air inlet for introducing air into the turbine expander.

7. A fully enclosed turbine generator, characterized in that, The organic Rankine cycle fully enclosed turbine generator set working fluid self-cooling structure includes any one of claims 1 to 6.

Images