A helium turbine structure and a helium turbine power generation device

Abstract

The present application provides a helium turbine structure and a helium turbine power generation device. The helium turbine structure includes an outer shell, an inner ring support shell, and a turbine casing that are coaxially nested from the outside to the inside, and also includes a core engine installed in the turbine casing. The front end of the outer shell is connected to the front end of the turbine casing through a front baffle, and the rear end of the outer shell is connected to the rear end of the turbine casing through a rear baffle to form a gas circulation chamber. The inner ring support shell is located between the front baffle and the rear baffle, and is interconnected with the outside of the turbine casing through a plurality of spaced support baffles, dividing the gas circulation chamber into a plurality of gas chambers that are spaced from each other and distributed in sequence along the axial direction, and each gas chamber is connected to the turbine casing in sequence. The heat exchanger module is installed on the outer surface of the inner ring support shell and is connected to each gas chamber. The present application optimizes the traditional helium turbine structure to form an integrated structure to meet the requirements of miniaturization and mobility of micro nuclear reactors.

Description

Technical Field

[0001] The present application relates to the field of closed Brayton cycle power generation systems, and more specifically, to a helium turbine structure and a helium turbine power generation device. Background Art

[0002] The gas closed Brayton cycle is an efficient heat-to-work conversion system with the advantages of diversified heat sources and flexible working fluids. It is suitable for both traditional fossil energy and clean energy and renewable energy. Especially in the field of high-temperature nuclear energy, it can be combined with the core directly or indirectly, and can be widely used in a variety of fourth-generation high-temperature nuclear energy reactors such as gas-cooled fast reactors, thorium-based molten salt reactors, and ultra-high temperature gas-cooled reactors, as well as future high-temperature nuclear fission reactors. Among the many optional working fluids, helium (or an inert mixture mainly composed of helium) is known as the ideal working fluid for the gas closed Brayton cycle due to its advantages in thermophysical and chemical properties. Compared with traditional nuclear power generation devices, the helium closed Brayton cycle device (referred to as "helium turbine") has the characteristics of compact structure, high power generation efficiency, and high safety. When the core outlet temperature reaches 950°C, the theoretical power generation efficiency can reach 50%.

[0003] From the perspective of thermodynamic cycle, the Brayton cycle is generally composed of four thermodynamic processes: adiabatic compression, isobaric heating, adiabatic expansion, and isobaric cooling. In order to improve the cycle efficiency, heat recovery and intercooling are usually performed. The core equipment of the closed Brayton cycle power generation system mainly includes low-pressure compressor, high-pressure compressor, turbine, precooler, intercooler and regenerator, etc. Therefore, its power generation system is more complicated than the traditional open Brayton cycle based on air working fluid. Moreover, if helium working fluid is used, its compressibility is poor, and the compressor speed and number of stages need to be greatly increased to achieve the designed pressure ratio, which further increases the length and mass of the turbine body. In addition, the supporting precooler, intercooler and regenerator equipment make the system compactness unsatisfactory.

[0004] At present, the demand for miniaturization and mobility of nuclear energy is becoming more and more obvious. Traditional nuclear-based helium Brayton cycle devices are usually designed as vertical structures for easy burial underground (to enhance safety), which makes their center of gravity too high and not conducive to mobility. In addition, although some turbine parts adopt a horizontal structure, their turbine and heat exchange components adopt a split design, which is also not suitable for the requirement of convenient mobility. Summary of the invention

[0005] The purpose of the present application is to provide a helium turbine structure and a helium turbine power generation device, which can provide a compact helium turbine structure, optimize the traditional helium turbine structure to form an integrated structure, and meet the requirements of miniaturization and mobility of micro nuclear reactors.

[0006] In a first aspect, the present application provides a helium turbine structure, including an outer shell and an inner ring support shell disposed in the outer shell, a turbine casing, a core engine, a heat exchanger module, a front baffle, a rear baffle, and a support baffle;

[0007] The outer casing, the inner ring support shell and the engine casing are coaxially nested, and radially from the inside to the outside are the engine casing, the inner ring support shell and the outer casing; the core engine is installed in the engine casing;

[0008] The front end of the outer shell is connected to the front end of the engine casing through a front end partition, and the rear end of the outer shell is connected to the rear end of the engine casing through a rear end partition to form a gas flow cavity;

[0009] The inner ring support shell is located between the front baffle and the rear baffle, and the inner side of the inner ring support shell and the outer side of the turbine casing are connected to each other through a plurality of support baffles arranged at intervals, so as to divide the gas flow cavity into a plurality of gas chambers which are spaced from each other and distributed in sequence along the axial direction, and each gas chamber is connected to a corresponding casing of the turbine casing in sequence;

[0010] The heat exchanger module is mounted on the outer surface of the inner ring support shell and is connected to each gas chamber;

[0011] Among them, high-temperature helium enters from the inner ring of the front end of the engine casing, and the circulated gas is discharged into the space between the outer ring of the front end of the engine casing and the inner ring of the front end of the outer shell through the heat exchanger module, and then discharged.

[0012] In an practicable solution, the turbine casing includes a turbine casing, a first compressor casing, and a second compressor casing connected in sequence from the front end to the rear end;

[0013] The core engine includes a turbine installed in a turbine casing, a first compressor installed in a first compressor casing, and a second compressor installed in a second compressor casing;

[0014] From the front end to the rear end of the turbine casing, the gas chamber includes a turbine outlet cavity, a first compressor inlet cavity, a first compressor outlet cavity, a second compressor inlet cavity, and a second compressor outlet cavity in sequence;

[0015] The turbine outlet is connected to the turbine outlet cavity, the first compressor inlet cavity is connected to the first compressor casing inlet, the first compressor casing outlet is connected to the first compressor outlet cavity, the second compressor inlet cavity is connected to the second compressor casing inlet, and the second compressor casing outlet is connected to the second compressor outlet cavity;

[0016] The heat exchanger module includes a regenerator, a precooler and an intercooler. The hot side inlet of the regenerator is connected to the turbine outlet cavity, the hot side outlet of the regenerator is connected to the inlet of the precooler, the outlet of the precooler is connected to the first compressor inlet cavity, the inlet of the intercooler is connected to the first compressor outlet cavity, the outlet of the intercooler is connected to the second compressor inlet cavity, the second compressor outlet cavity is connected to the cold side inlet of the regenerator, and the cold side outlet of the regenerator is connected to the cavity between the front end outer ring of the turbine casing and the front end inner ring of the outer casing on the front side of the front end partition.

[0017] In an implementable solution, there are multiple heat exchanger modules, which are circumferentially arranged around the outer surface of the inner ring support shell.

[0018] In one feasible solution, the number of the heat exchanger modules is greater than or equal to three.

[0019] In an implementable solution, the outer shell is arranged horizontally when in use, with the vertical plane passing through the axis of the outer shell being the vertical center plane, and the plurality of heat exchanger modules are symmetrically distributed about the vertical center plane.

[0020] In one feasible solution, the compression ratio of the second compressor is greater than the compression ratio of the first compressor.

[0021] In an implementable solution, the helium turbine structure includes a double-layer casing, which includes an inner tube and an outer tube. The inner tube is connected to the front end opening of the turbine casing, and the outer tube is connected to the front end opening of the outer shell.

[0022] In an implementable solution, the precooler and the intercooler are integrated into a whole, and the hot side outlet of the regenerator is connected to the precooler inlet through a bellows.

[0023] In an operative solution, the helium turbine structure comprises a mobile platform, a base is provided on the outer bottom side of the outer shell, and the helium turbine structure is installed on the mobile platform via the base.

[0024] In a second aspect, the present application provides a helium turbine power generation device, characterized in that it includes a generator and the aforementioned helium turbine structure, the generator is arranged in a cavity between the rear end of the outer shell of the helium turbine structure and the rear end partition, and the generator is connected to the rear end of the core engine.

[0025] Compared with the prior art, the beneficial effects of the present application include at least the following:

[0026] In the helium turbine structure of the present application, the turbine casing outside the core engine is connected to the inner ring support shell through a support partition, and cooperates with the outer shell and the front and rear partitions to divide the space between the inner ring support shell and the turbine casing into multiple gas chambers, which are used for exhaust and air intake of various parts of the core engine respectively. This structural design realizes the connection of various devices by relying on the cavity, reduces the connecting pipes between various devices in the helium turbine structure, simplifies the helium turbine structure, improves the integration of the internal pipelines of the helium turbine structure, and helps to achieve the purpose of miniaturization.

[0027] At the same time, the outer shell not only wraps the core engine, turbine casing, inner ring support shell, etc., but also integrates the heat exchanger module inside the outer shell. Moreover, because the inner ring support shell is added, the heat exchanger module can be directly installed on the inner ring support shell. The multiple gas chambers formed between the inner ring support shell and the turbine casing can also play a stable supporting role, so that the stability of the overall integrated structure in a high-pressure and high-temperature gas environment is guaranteed. Moreover, because the outer shell wraps all equipment components and structures inside, forming an integrated helium turbine structure, it is conducive to achieving the purpose of convenient movement. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0029] Figure 1 This is a schematic diagram of the internal structure of a helium turbine structure shown in an embodiment of the present application.

[0030] Figure 2 For along Figure 1 AA cross-sectional view of the helium turbine structure.

[0031] Figure 3 This is a working fluid flow diagram inside the helium turbine structure shown in an embodiment of the present application.

[0032] In the figure: 1. outer shell; 11. base; 2. inner ring support shell; 3. turbine casing; 31. turbine casing; 32. first compressor casing; 33. second compressor casing; 4. core engine; 41. turbine; 42. first compressor; 43. second compressor; 5. generator; 6. heat exchanger module; 61. regenerator; 62. precooler; 63. intercooler; 64. bellows; 7. front baffle; 8. rear baffle; 9. support baffle; 10. double-layer casing; 101. turbine outlet cavity; 102. first compressor inlet cavity; 103. first compressor outlet cavity; 104. second compressor inlet cavity; 105. second compressor outlet cavity. DETAILED DESCRIPTION

[0033] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the drawings here can be arranged and designed in various different configurations.

[0034] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the present application for which protection is sought, but merely represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present application.

[0035] The present application embodiment provides a helium turbine structure, such as Figure 2 As shown, the helium turbine structure includes an outer shell 1 and an inner ring support shell 2 arranged in the outer shell 1, a turbine casing 3, a core machine 4, a heat exchanger module 6, a front partition 7, a rear partition 8, and a support partition 9.

[0036] Among them, the outer shell 1, the inner ring support shell 2 and the engine casing 3 are coaxially nested, and radially from the inside to the outside are the engine casing 3, the inner ring support shell 2, and the outer shell 1. The core engine 4 is installed in the engine casing 3, and the core engine 4 at the center of the outer shell 1 is installed horizontally. The end of the core engine 4 can be connected to the generator 5 to drive it to generate electricity.

[0037] The front end of the outer shell 1 is connected to the front end of the turbine casing 3 through the front end partition 7, and the rear end of the outer shell 1 is connected to the rear end of the turbine casing 3 through the rear end partition 8 to form a gas circulation cavity. The inner ring support shell 2 is located between the front end partition 7 and the rear end partition 8, and the inner side of the inner ring support shell 2 and the outer side of the turbine casing 3 are connected to each other through a plurality of spaced support partitions 9 to divide the gas circulation cavity into a plurality of gas chambers spaced from each other and distributed in sequence along the axial direction, and each gas chamber is sequentially connected to each corresponding casing of the turbine casing 3. The heat exchanger module 6 is installed on the outer surface of the inner ring support shell 2 and is connected to each gas chamber.

[0038] Among them, high-temperature helium (from the core) enters from the inner ring of the front end of the turbine casing 3, and the circulated gas is discharged between the outer ring of the front end of the turbine casing 3 and the inner ring of the front end of the outer shell 1 through the heat exchanger module 6, and then discharged (to the core).

[0039] In summary, in the helium turbine structure of this embodiment, the turbine casing 3 outside the core engine 4 is connected to the inner ring support shell 2 through the support partition 9, and cooperates with the outer shell 1 and the front partition 7 and the rear partition 8, so as to divide the space between the inner ring support shell 2 and the turbine casing 3 into multiple gas chambers, which are used for exhaust and air intake of various parts of the core engine 4 respectively. This structural design realizes the connection of various devices by relying on the cavity, reduces the connecting pipes between various devices in the helium turbine structure, simplifies the helium turbine structure, improves the integration of the internal pipelines of the helium turbine structure, and helps to achieve the purpose of miniaturization.

[0040] At the same time, the outer shell 1 not only wraps the core engine 4, the turbine casing 3, the inner ring support shell 2, etc., but also integrates the heat exchanger module 6 inside the outer shell 1. Moreover, because the inner ring support shell 2 is added, the heat exchanger module 6 can be directly installed on the inner ring support shell 2, and the multiple gas chambers formed between the inner ring support shell 2 and the turbine casing 3 can also play a stable supporting role, so that the stability of the integrated structure in the high-pressure and high-temperature gas environment can be guaranteed. Moreover, because the outer shell 1 wraps all equipment components and structures inside, forming an integrated helium turbine structure, it is conducive to achieving the purpose of convenient movement.

[0041] In this embodiment, if Figure 3 As shown, the turbine casing 3 includes a turbine casing 31, a first compressor casing 32, and a second compressor casing 33 connected in sequence from the front end to the rear end. The core engine 4 includes a turbine 41 installed in the turbine casing 31, a first compressor 42 installed in the first compressor casing 32, and a second compressor 43 installed in the second compressor casing 33.

[0042] From the front end to the rear end of the turbine casing 3, the gas chambers sequentially include a turbine outlet cavity 101, a first compressor inlet cavity 102, a first compressor outlet cavity 103, a second compressor inlet cavity 104, and a second compressor outlet cavity 105. The outlet of the turbine 41 is connected to the turbine outlet cavity 101, the first compressor inlet cavity 102 is connected to the inlet of the first compressor casing 32, the outlet of the first compressor casing 32 is connected to the first compressor outlet cavity 103, the second compressor inlet cavity 104 is connected to the inlet of the second compressor casing 33, and the outlet of the second compressor casing 33 is connected to the second compressor outlet cavity 105.

[0043] The heat exchanger module 6 includes a regenerator 61, a precooler 62 and an intercooler 63. The hot side inlet of the regenerator 61 is connected to the turbine outlet cavity 101, the hot side outlet of the regenerator 61 is connected to the inlet of the precooler 62, the outlet of the precooler 62 is connected to the first compressor inlet cavity 102, the inlet of the intercooler 63 is connected to the first compressor outlet cavity 103, the outlet of the intercooler 63 is connected to the second compressor inlet cavity 104, the second compressor outlet cavity 105 is connected to the cold side inlet of the regenerator 61, and the cold side outlet of the regenerator 61 is connected to the cavity between the front end outer ring of the turbine casing 3 and the front end inner ring of the outer casing 1 on the front side of the front end partition 7.

[0044] Combination Figure 3 As can be seen from the foregoing content, the turbine casing 3 is connected to the inner ring support shell 2 through the support partition 9, and cooperates with the outer shell 1 and the front partition 7 and the rear partition 8, thereby forming a turbine outlet cavity 101, a first compressor inlet cavity 102, a first compressor outlet cavity 103, a second compressor inlet cavity 104, and a second compressor outlet cavity 105, which are respectively used for the exhaust of the turbine 41, the intake of the first compressor 42, the exhaust of the first compressor 42, the intake of the second compressor 43, and the exhaust of the second compressor 43, thereby basically completely simplifying the connecting pipes and realizing a high degree of integration of the airflow path.

[0045] In one embodiment, if Figure 1 As shown, there are multiple heat exchanger modules 6, which are circumferentially arranged on the outer surface of the inner ring support shell 2, which not only fully utilizes the installation space and improves the degree of integration, but also facilitates the relatively uniform flow of the working fluid through each heat exchanger module 6, thereby helping to optimize the flow path of the internal working fluid.

[0046] In one embodiment, if Figure 1 As shown, the number of heat exchanger modules 6 is greater than or equal to three, for example, 4, 5, 6, etc. can be set.

[0047] In one embodiment, the outer shell 1 is arranged horizontally when in use. Figure 1As shown, the vertical plane passing through the axis of the outer shell 1 is the vertical center plane, and multiple heat exchanger modules 6 are symmetrically distributed about the vertical center plane. To a certain extent, the symmetrical structure is conducive to improving the stability of the working fluid flow, balancing the impact of the working fluid on the internal structure, and maintaining the operating stability of the internal structure.

[0048] In one embodiment, the compression ratio of the second compressor 43 is greater than that of the first compressor 42 , that is, the second compressor 43 is a high-pressure compressor and the first compressor 42 is a low-pressure compressor.

[0049] In one embodiment, if Figure 2 As shown, the helium turbine structure includes a double-layer casing 10, which includes an inner tube and an outer tube, the inner tube is butted with the front opening of the turbine casing 3, and the outer tube is butted with the front opening of the outer cladding 1. It can be seen that the turbine 41 intake and the cold side exhaust of the regenerator 61 are both axial and are double-layer casings 10, which are convenient for connection with the core pipeline.

[0050] In one embodiment, if Figure 2 and Figure 3 As shown, the precooler 62 and the intercooler 63 are integrated into a whole, and the hot side outlet of the regenerator 61 is connected to the inlet of the precooler 62 through a bellows 64.

[0051] Because the precooler 62, intercooler 63 and regenerator 61 undertake different heat exchange tasks. The precooler 62 is responsible for reducing the temperature of the helium working fluid discharged from the turbine 41, and the intercooler 63 further reduces the temperature of the helium after the first compressor 42 (also known as the low-pressure compressor), while the function of the regenerator 61 is to recover heat, increase the temperature of the helium, and heat the discharged helium. In view of the functions of each module, the precooler 62 and the intercooler 63 are both used to reduce the temperature of the helium, and at the same time, in order to improve the integration, they are integrated into a whole. The regenerator 61 has different functions from the precooler 62 and the intercooler 63, so they are connected by a bellows 64 to achieve spacing from each other.

[0052] In this embodiment, the working medium flow in the helium turbine structure is as follows: the high-temperature helium at the reactor outlet first enters the turbine 41 through the horizontal turbine inlet pipe, then enters the circumferentially arranged regenerators 61 through the turbine outlet cavity 101, and then directly enters the precooler 62 part for precooling, and then passes through the first compressor inlet cavity 102 to the first compressor 42 (low-pressure compressor), and then enters the intercooler 63 part from the outlet of the first compressor 42 through the first compressor outlet cavity 103, and then passes through the second compressor inlet cavity 104 to the second compressor 43 (high-pressure compressor), and then enters the window of the regenerator from the outlet of the second compressor 43 through the second compressor outlet cavity 105 to enter the cold side inlet of the regenerator 61, and then enters the cavity between the front end outer ring of the turbine casing 3 and the front end inner ring of the outer cladding 1 from the cold side outlet of the regenerator 61, and then goes to the reactor.

[0053] In one embodiment, the helium turbine structure may further include a mobile platform (not shown in the figure), see Figure 1 A base 11 is provided on the outer bottom side of the outer shell 1, and the helium turbine structure is installed on the mobile platform through the base 11 to facilitate the movement and transportation of the helium turbine structure.

[0054] like Figure 2 As shown, the present application provides a helium turbine power generation device, including a generator 5 and the aforementioned helium turbine structure, the generator 5 is arranged in a cavity between the rear end of the outer shell 1 of the helium turbine structure and the rear end partition 8, and the generator 5 is connected to the rear end of the core engine 4.

[0055] In addition, the helium turbine structure of this embodiment can be used as a power source to drive the operation of other equipment in addition to driving the generator 5 to generate electricity.

[0056] The above description is only a partial embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A helium turbine structure, characterized in that: It comprises an outer shell (1), an inner ring support shell (2) arranged in the outer shell (1), a turbine casing (3), a core engine (4), a heat exchanger module (6), a front baffle (7), a rear baffle (8), and a support baffle (9); The outer casing (1), the inner ring support casing (2) and the engine casing (3) are coaxially nested and radially from inside to outside are the engine casing (3), the inner ring support casing (2) and the outer casing (1); the core engine (4) is installed in the engine casing (3); The front end of the outer shell (1) is connected to the front end of the turbine casing (3) via the front end baffle (7), and the rear end of the outer shell (1) is connected to the rear end of the turbine casing (3) via the rear end baffle (8), so as to form a gas flow cavity; The inner ring support shell (2) is located between the front baffle (7) and the rear baffle (8), and the inner side of the inner ring support shell (2) and the outer side of the turbine casing (3) are connected to each other via a plurality of support baffles (9) arranged at intervals, so as to divide the gas flow cavity into a plurality of gas chambers which are spaced from each other and distributed in sequence along the axial direction, and each of the gas chambers is connected in sequence to a corresponding casing of the turbine casing (3); The heat exchanger module (6) is mounted on the outer surface of the inner ring support shell (2) and is in communication with each of the gas chambers; The high-temperature helium enters from the front inner ring of the turbine casing (3), and the circulated gas is discharged through the heat exchanger module (6) into the space between the front outer ring of the turbine casing (3) and the front inner ring of the outer shell (1), and then discharged.

2. The helium turbine structure according to claim 1, characterized in that: The turbine casing (3) comprises a turbine casing (31), a first compressor casing (32) and a second compressor casing (33) which are sequentially connected from the front end to the rear end; The core engine (4) comprises a turbine (41) installed in the turbine casing (31), a first compressor (42) installed in the first compressor casing (32), and a second compressor (43) installed in the second compressor casing (33); From the front end to the rear end of the turbine casing (3), the gas chamber includes, in sequence, a turbine air outlet chamber (101), a first compressor air inlet chamber (102), a first compressor air outlet chamber (103), a second compressor air inlet chamber (104), and a second compressor air outlet chamber (105); The turbine (41) outlet is connected to the turbine air outlet cavity (101), the first compressor air inlet cavity (102) is connected to the first compressor casing (32) inlet, the first compressor casing (32) outlet is connected to the first compressor air outlet cavity (103), the second compressor air inlet cavity (104) is connected to the second compressor casing (33) inlet, and the second compressor casing (33) outlet is connected to the second compressor air outlet cavity (105); The heat exchanger module (6) comprises a regenerator (61), a precooler (62) and an intercooler (63); the hot side inlet of the regenerator (61) is connected to the turbine outlet cavity (101); the hot side outlet of the regenerator (61) is connected to the inlet of the precooler (62); the outlet of the precooler (62) is connected to the first compressor inlet cavity (102); the inlet of the intercooler (63) is connected to the first compressor outlet cavity (103); the outlet of the intercooler (63) is connected to the second compressor inlet cavity (104); the second compressor outlet cavity (105) is connected to the cold side inlet of the regenerator (61); and the cold side outlet of the regenerator (61) is connected to a cavity between the front end outer ring of the turbine casing (3) and the front end inner ring of the outer casing (1) at the front side of the front baffle (7).

3. The helium turbine structure according to claim 1 or 2, characterized in that: The heat exchanger modules (6) are multiple in number and are arranged circumferentially around the outer surface of the inner ring support shell (2).

4. The helium turbine structure according to claim 3, characterized in that: The number of the heat exchanger modules (6) is greater than or equal to three.

5. The helium turbine structure according to claim 3, characterized in that: The outer shell (1) is arranged horizontally when in use, with a vertical plane passing through the axis of the outer shell (1) as a vertical center plane, and a plurality of the heat exchanger modules (6) are symmetrically distributed about the vertical center plane.

6. The helium turbine structure according to claim 2, characterized in that: The compression ratio of the second compressor (43) is greater than the compression ratio of the first compressor (42).

7. The helium turbine structure according to claim 1, characterized in that: The helium turbine structure comprises a double-layer casing (10), the double-layer casing (10) comprising an inner tube and an outer tube, the inner tube butting against a front end opening of the turbine casing (3), and the outer tube butting against a front end opening of the outer casing (1).

8. The helium turbine structure according to claim 2, characterized in that: The precooler (62) and the intercooler (63) are integrated into a whole, and the hot side outlet of the regenerator (61) is connected to the inlet of the precooler (62) via a bellows (64).

9. The helium turbine structure according to claim 1, characterized in that: The helium turbine structure comprises a mobile platform, a base (11) is provided on the outer bottom side of the outer shell (1), and the helium turbine structure is installed on the mobile platform via the base (11).

10. A helium turbine power generation device, characterized in that: It comprises a generator (5) and a helium turbine structure as claimed in any one of claims 1 to 9, wherein the generator (5) is arranged in a cavity between the rear end of an outer envelope (1) of the helium turbine structure and a rear end partition (8), and the generator (5) is connected to the rear end of a core engine (4).

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