Axial compact power generation unit

Abstract

This invention provides an axially compact power generation device, comprising: a cylinder, including a cylinder body, with a support member and a limiting member on the inner peripheral wall of the cylinder body, and a compressor exhaust pipe and a turbine inlet pipe on the outer peripheral wall of the cylinder body; a centrifugal compressor, including an inlet guide cover plate disposed at a first port of the cylinder body; and a radial turbine, including a turbine volute, a volute inlet pipe, a volute exhaust pipe, and a baffle plate, with an overlapping member supported by the support member and a positioning member constrained by the limiting member on the outer peripheral wall of the turbine volute; the two ends of the volute inlet pipe are respectively connected to the turbine volute and the turbine inlet pipe; the volute exhaust pipe is connected to the turbine volute; and the baffle plate is disposed at a second port of the cylinder body and is airtightly penetrated by the volute exhaust pipe. This invention can greatly reduce the heat dissipation loss of the unit and the thickness of the unit's insulation layer, and improve the axial compactness of its overall structure.

Description

Technical Field

[0001] This invention relates to the field of micro-power generation technology, and in particular to an axially compact power generation device. Background Technology

[0002] Electricity is the most basic, cleanest, and most convenient energy source for human society.

[0003] New energy sources have been repeatedly mentioned in recent years, and the proportion of electricity generated by coal-fired power generation has been decreasing year by year. New energy sources in the power generation field mainly include solar thermal power generation (primarily solar energy), geothermal power generation, and tidal power generation, etc. Power generation based on natural gas is also a type of clean energy. This invention relates to micro gas turbines based on gas-fired power generation, CO2 turbines based on solar power generation, and micro Brayton cycle devices based on nuclear power.

[0004] Micro generator sets typically consist of a centrifugal compressor impeller and a radial turbine impeller. For higher power outputs, multi-stage compression and axial turbines may be used. There are generally two shaft system structures: one is a cantilever structure with the centrifugal compressor and radial turbine back-to-back. This cantilever structure is compact, has no bearings at the cold end, is easy to install, and has high reliability; however, its disadvantage is a relatively large dynamic-to-static clearance between either the compressor or the turbine. Another structure places the motor between the compressor and turbine impellers, forming a single cantilever structure at both ends of the motor (similar to this mechanism is a bearing placed between two impellers). This structure has the advantages of high transmission efficiency and good reliability; however, its disadvantages include high temperatures at the bearing location near the motor on the turbine impeller, requiring higher heat exchange capabilities for the bearings, and a complex unit sealing structure.

[0005] To further improve unit efficiency and operational stability, the future of micro generators still lies in the cantilever structure with the compressor and impeller back-to-back. This structure typically has only two bearings, resulting in a compact design. For small units of a few hundred kilowatts, it can even be made into a mobile generator, integrating the entire unit and heat source into a container truck for transport to where energy is needed. The compact structure presents challenges for the cylinders, requiring the arrangement of the centrifugal compressor's inlet and exhaust chambers, the radial turbine's inlet and exhaust chambers, and pipe interfaces within a very small axial space. Furthermore, the outer surface of the entire unit needs to be insulated. Simplifying structural manufacturing, facilitating installation and disassembly, and minimizing heat dissipation from the cylinders have become paramount in the development of cylinders for micro generators.

[0006] Some of the aforementioned challenges in improving the cost-effectiveness, simplifying the structure, and reducing cylinder heat dissipation of micro-power generation devices are currently under research. For example, the patent application "An Inlet Scroll and Gas Turbine" (Chinese Patent Application CN201711183831.7), which improves unit efficiency by optimizing the turbine inlet scroll, only focuses on the scroll design and does not involve the optimization of the overall cylinder structure dimensions. Another example is the "Micro Gas Turbine Power Generation Device" (Chinese Patent CN201220547118.2) with a double scroll structure. The compressor exhaust structure of this patent includes a turbine inlet scroll, but its overall structure is still not compact enough. Summary of the Invention

[0007] In view of the shortcomings of the prior art described above, the technical problem to be solved by the present invention is to provide an axially compact power generation device that can greatly reduce the heat loss of the unit and the thickness of the unit's insulation layer, improve the axial compactness of its overall structure, save power generation costs, and reduce manufacturing costs.

[0008] To address the aforementioned technical problems, the present invention provides an axially compact power generation device, comprising:

[0009] A cylinder includes an axially penetrating cylinder body with two ports, namely a first port and a second port. The inner peripheral wall of the cylinder body is provided with a support and a limiting component. The outer peripheral wall of the cylinder body is provided with a compressor exhaust pipe and a turbine intake pipe, both for connecting to a heat source. The compressor exhaust pipe is connected to the inner cavity of the cylinder body.

[0010] A centrifugal compressor, which includes an air inlet guide cover plate located at the first port of the cylinder body;

[0011] A radial turbine includes a turbine housing, a housing intake pipe, a housing exhaust pipe, and a baffle plate. The outer peripheral wall of the turbine housing is provided with an overlapping member supported by the support member and a positioning member constrained by the limiting member. The two ends of the housing intake pipe are respectively connected to the turbine housing and the turbine intake pipe. The housing exhaust pipe is connected to the turbine housing. The baffle plate is located at the second port of the cylinder body and is airtightly passed through by the housing exhaust pipe.

[0012] Preferably, the cylinder body includes a lower cylinder body and an upper cylinder body that are joined together vertically; the number of the supporting members is two and they are symmetrically arranged on the lower cylinder body near the cylinder split surface, and the limiting member is located at the bottom of the lower cylinder body.

[0013] Preferably, one opening of the turbine inlet pipe is integrally formed into the turbine volute, and the other opening is provided with a snap-fit ​​ring pipe; the opening of the turbine inlet pipe facing the turbine volute is provided with an annular groove, and the annular groove is inserted and engaged with the snap-fit ​​ring pipe.

[0014] Preferably, the snap-fit ​​ring tube is detachably connected to the volute intake pipe via a fastening ring tube.

[0015] Preferably, the fastening ring tube includes a threaded tube section and a clamping tube section, the threaded tube section being threadedly connected to the volute intake pipe; the clamping ring tube includes an abutting tube section and an inserting tube section, the abutting tube section being clamped between the port of the turbine intake pipe and the clamping tube section, and the inserting tube section being inserted into the annular groove.

[0016] Preferably, the axially compact power generation device further includes an axial exhaust device, which is connected to the volute exhaust pipe.

[0017] Preferably, the axially compact power generation device further includes a circumferential exhaust device, which is connected to the volute exhaust pipe.

[0018] Preferably, the circumferential exhaust device includes a circumferential shroud and a circumferential exhaust pipe. The circumferential shroud is located at the second port of the cylinder body, and the circumferential exhaust pipe is located on the outer peripheral wall of the circumferential shroud and communicates with the inner cavity of the circumferential shroud.

[0019] Preferably, the axially compact power generation device further includes a rotor that rotates through the air inlet guide cover and the turbine casing; the centrifugal compressor further includes a compressor impeller integrally formed with the rotor, and the radial turbine further includes a turbine impeller integrally formed with the rotor.

[0020] Preferably, the centrifugal compressor further includes a diffuser disposed inside the inlet guide cover; the cylinder further includes a sealing plate, which is located between the compressor impeller and the turbine impeller and is clamped between the diffuser and the turbine volute.

[0021] As described above, the axially compact power generation device of the present invention has the following beneficial effects: In the present invention, the inner peripheral wall of the cylinder body is provided with a support member and a limiting member. The support member is used to bear all or part of the weight of the turbine volute, and the limiting member is used to restrict the arrangement position of the turbine volute. At the same time, the outer peripheral wall of the turbine volute is provided with an overlapping member supported by the support member and a positioning member constrained by the limiting member, so that the turbine volute can be semi-suspended in the inner cavity of the cylinder body. In addition, the outer peripheral wall of the cylinder body is provided with a compressor exhaust pipe and a turbine intake pipe. The compressor exhaust pipe is connected to the inner cavity of the cylinder body, the two ends of the volute intake pipe are respectively connected to the turbine volute and the turbine intake pipe, and the volute exhaust pipe is connected to the turbine volute and airtightly passes through the baffle plate. In this configuration, firstly, a working fluid flows through the centrifugal compressor and enters the inner cavity of the cylinder, where its pressure increases. Next, the working fluid flows through the heat source to absorb heat. Then, the working fluid flows sequentially through the turbine inlet pipe and the volute inlet pipe into the turbine volute, where it is under high temperature and pressure. Finally, the working fluid converts thermal energy into mechanical energy within the turbine volute. Because the turbine volute is semi-suspended within the cylinder cavity, and there is a temperature difference between the working fluid inside the cylinder and the working fluid inside the turbine volute, the turbine volute is not directly exposed to the environment. This allows the working fluid inside the turbine volute to dissipate heat to the working fluid inside the cylinder, resulting in the external temperature difference being the temperature difference between the cylinder and the environment. This significantly reduces heat loss and the thickness of the insulation layer, saving on power generation costs. Furthermore, the centrifugal compressor and radial turbine are integrated into the cylinder, especially the turbine casing, which is arranged within the cylinder body. This allows the axially compact power generation device of the present invention to reduce its axial dimensions, resulting in a more compact overall structure. Finally, apart from the turbine casing, other components can be formed using simple stamping and welding processes, facilitating manufacturing and reducing production costs. Therefore, the axially compact power generation device of the present invention can significantly reduce heat loss and insulation layer thickness, improve the axial compactness of its overall structure, save on power generation costs, and reduce manufacturing costs. Attached Figure Description

[0022] Figure 1 Shown is a perspective view of the axially compact power generation device of the present invention;

[0023] Figure 2 Shown is a first axial sectional view of an axially compact power generation unit;

[0024] Figure 3 Shown is a second axial sectional view of an axially compact power generation unit;

[0025] Figure 4 Shown as a transverse sectional view of an axially compact power generation unit;

[0026] Figure 5 Displayed as Figure 4 Enlarged view of section A;

[0027] Figure 6 Shown as a 3D view of the air intake guide cover;

[0028] Figure 7 The diagram shows a 3D view of the upper cylinder block, compressor exhaust pipe, and turbine intake pipe.

[0029] Figure 8 The image shows a 3D view of the lower cylinder block, support components, and limiting components.

[0030] Figure 9 Displayed as a 3D view of the centripetal turbine;

[0031] Figure 10 The image shown is a 3D view of a circumferential exhaust system.

[0032] Component designation explanation

[0033] 1 cylinder

[0034] 11 Cylinder body

[0035] 111 Lower cylinder block

[0036] 112 Upper cylinder block

[0037] 12 Supporting components

[0038] 13 Limiting components

[0039] 14 Compressor exhaust pipe

[0040] 15 Turbine Inlet Pipe

[0041] 151 Circular slot

[0042] 16 Sealing Plate

[0043] 2 Centrifugal compressor

[0044] 21. Intake deflector cover

[0045] 22 Compressor impeller

[0046] 23 Diffuser

[0047] 3. Centripetal turbine

[0048] 31 Turbine volute

[0049] 32. Volute intake pipe

[0050] 33. Volute exhaust pipe

[0051] 34. Air baffle plate

[0052] 35. Overlapping parts

[0053] 36 positioning components

[0054] 37. Clip-on ring pipe

[0055] 371 Attachment Section

[0056] 372 Connecting pipe section

[0057] 38 Fastening ring tube

[0058] 381 threaded pipe section

[0059] 382 clamping pipe section

[0060] 39 Turbine Impeller

[0061] 4. Circumferential exhaust system

[0062] 41-week fairing

[0063] 42 Circumferential Exhaust Pipe

[0064] 5 rotors Detailed Implementation

[0065] The following specific embodiments illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification.

[0066] It should be understood that the structures, proportions, sizes, etc., depicted in the accompanying drawings of this specification are merely for illustrative purposes to aid those skilled in the art and are not intended to limit the scope of the invention. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in proportions, or adjustments to size, without affecting the effectiveness and purpose of the invention, should still fall within the scope of the technical content disclosed in this invention. Furthermore, the terms such as "upper," "lower," "left," "right," "middle," and "one" used in this specification are merely for clarity and are not intended to limit the scope of the invention. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered within the scope of the invention's implementation.

[0067] like Figures 1 to 9 As shown, the present invention provides an axially compact power generation device, comprising:

[0068] Cylinder 1 includes an axially penetrating cylinder body 11. The two ports of the cylinder body 11 are a first port and a second port, respectively. The inner peripheral wall of the cylinder body 11 is provided with a support member 12 and a limiting member 13. The outer peripheral wall of the cylinder body 11 is provided with a compressor exhaust pipe 14 and a turbine intake pipe 15, both of which are used to connect to a heat source (such as a nuclear island). The compressor exhaust pipe 14 is connected to the inner cavity of the cylinder body 11.

[0069] Centrifugal compressor 2, centrifugal compressor 2 includes an air inlet guide cover 21, the air inlet guide cover 21 is disposed at the first port of cylinder body 11;

[0070] The radial turbine 3 includes a turbine housing 31, a housing intake pipe 32, a housing exhaust pipe 33, and a baffle plate 34. The outer peripheral wall of the turbine housing 31 is provided with an overlapping member 35 supported by the aforementioned support member 12 and a positioning member 36 constrained by the aforementioned limiting member 13. The two ends of the housing intake pipe 32 are respectively connected to the turbine housing 31 and the turbine intake pipe 15. The housing exhaust pipe 33 is connected to the turbine housing 31. The baffle plate 34 is provided at the second port of the cylinder body 11 and is airtightly passed through by the housing exhaust pipe 33.

[0071] In this invention, the inner peripheral wall of the cylinder body 11 is provided with a support member 12 and a limiting member 13. The support member 12 is used to support all or part of the weight of the turbine housing 31, and the limiting member 13 is used to restrict the arrangement position of the turbine housing 31. For example, the limiting member 13 can prevent the turbine housing 31 from rotating around its own axis. At the same time, the outer peripheral wall of the turbine housing 31 is provided with an overlapping member 35 supported by the support member 12 and a positioning member 36 constrained by the limiting member 13, so that the turbine housing 31 can be semi-suspended in the inner cavity of the cylinder body 11. Furthermore, the outer peripheral wall of the cylinder body 11 is provided with a compressor exhaust pipe 14 and a turbine intake pipe 15. The compressor exhaust pipe 14 is connected to the inner cavity of the cylinder body 11. The two ends of the aforementioned volute intake pipe 32 are respectively connected to the turbine volute 31 and the turbine intake pipe 15. The volute exhaust pipe 33 is connected to the turbine volute 31 and is airtightly installed through the baffle plate 34. With this configuration, firstly, a working fluid (e.g., air) enters the inner cavity of the cylinder body 11 after flowing through the centrifugal compressor 2, at which point the pressure of the working fluid increases. Next, the working fluid flows through the aforementioned heat source to absorb heat. Then, the working fluid flows sequentially through the aforementioned turbine intake pipe 15 and volute intake pipe 32 into the turbine volute 31, at which point the working fluid is in a high temperature and high pressure state. Finally, the working fluid converts thermal energy into mechanical energy within the turbine volute 31. Because the turbine casing 31 is semi-suspended within the cylinder body 11 and there is a temperature difference between the working fluid inside the cylinder body 11 and the working fluid inside the turbine casing 31, the turbine casing 31 is not directly exposed to the environment. This allows the working fluid inside the turbine casing 31 to dissipate heat to the working fluid inside the cylinder body 11. Consequently, the temperature difference outside the unit is the same as the temperature difference between the cylinder 1 and the environment, significantly reducing heat loss and the thickness of the insulation layer, thus saving on power generation costs. Furthermore, the centrifugal compressor 2 and the radial turbine 3 are integrated into the cylinder 1, and especially the turbine casing 31 is arranged inside the cylinder body 11. This allows the axially compact power generation device of the present invention to reduce its axial dimensions, making its overall structure more compact. Finally, apart from the turbine casing 31, other components can be formed using simple stamping and welding processes, facilitating manufacturing and reducing manufacturing costs.

[0072] Therefore, the axially compact power generation device of the present invention can greatly reduce the heat loss of the unit and the thickness of the unit's insulation layer, improve the axial compactness of its overall structure, save power generation costs, and reduce manufacturing costs.

[0073] like Figure 7As shown, to facilitate the disassembly and assembly of the cylinder body 11 and the turbine housing 31, the cylinder body 11 includes a lower cylinder body 111 and an upper cylinder body 112 that are joined together vertically. Two support members 12 are symmetrically arranged on the lower cylinder body 111 near the cylinder's split surface, and a limiting member 13 is located at the bottom of the lower cylinder body 111. Specifically, the limiting member 13 has a groove structure that extends parallel to the axial direction of the cylinder body 11, thus restricting the circumferential rotation of the turbine housing 31. The support member 12 has a trunnion bracket structure, thus restricting the axial movement of the turbine housing 31 along the cylinder body 11 while also bearing the weight of the turbine housing 31.

[0074] To facilitate quick and easy assembly and disassembly of the turbine intake pipe 15 and the volute intake pipe 32, one end of the volute intake pipe 32 is integrally formed into the turbine volute 31, and the other end is provided with a snap-fit ​​ring tube 37. The end of the turbine intake pipe 15 facing the turbine volute 31 is provided with an annular groove 151, which is inserted into the snap-fit ​​ring tube 37. It is worth noting that under the influence of temperature difference, the differential expansion (the difference in relative expansion) of the cylinder body 11 (especially the upper cylinder body 112) and the turbine volute 31 is slightly different. The snap-fit ​​ring tube 37 can absorb some of the deformation and reduce local stress.

[0075] like Figure 4 , Figure 5 as well as Figure 8 As shown, in order to facilitate the installation of the snap-fit ​​ring tube 37 to the volute intake pipe 32, the snap-fit ​​ring tube 37 is detachably connected to the volute intake pipe 32 by means of a fastening ring tube 38.

[0076] Furthermore, the aforementioned fastening ring tube 38 includes a threaded tube section 381 and a clamping tube section 382, ​​with the threaded tube section 381 threadedly connected to the volute intake pipe 32; the aforementioned clamping ring tube 37 includes an abutting tube section 371 and an inserting tube section 372, with the abutting tube section 371 clamped between the port of the turbine intake pipe 15 and the clamping tube section 382, ​​and the inserting tube section 372 inserted into the annular groove 151.

[0077] Specifically, the aforementioned volute intake pipe 32 is machined with internal threads, and the aforementioned threaded pipe section 381 is machined with external threads. During installation, the threaded pipe section 381 of the aforementioned fastening ring pipe 38 is screwed into the pipe opening of the aforementioned volute intake pipe 32 until the pipe section 382 is locked and secured to the aforementioned abutment pipe section 371. See details. Figure 5 The radial cross section of the aforementioned fastening ring tube 38 is inverted L-shaped, and the radial cross section of the aforementioned snap-fit ​​ring tube 37 is also positive L-shaped. This arrangement facilitates assembly and ensures good airtightness.

[0078] The cylinder 1 of the axially compact power generation device of the present invention has strong versatility, capable of both axial and circumferential exhaust functions, thus saving design costs. To achieve the axial exhaust function, the aforementioned axially compact power generation device further includes an axial exhaust device (not shown), which is connected to the volute exhaust pipe 33. The aforementioned axial exhaust device can be an axial exhaust pipe.

[0079] To achieve circumferential exhaust function, the aforementioned axially compact power generation device also includes a circumferential exhaust device 4, which is connected to the volute exhaust pipe 33.

[0080] like Figure 10 As shown, the circumferential exhaust device 4 includes a circumferential shroud 41 and a circumferential exhaust pipe 42. The circumferential shroud 41 is located at the second port of the cylinder body 11, and the circumferential exhaust pipe 42 is located on the outer peripheral wall of the circumferential shroud 41 and communicates with the inner cavity of the circumferential shroud 41.

[0081] like Figure 2 and Figure 3 As shown, in order to further improve the compactness of the above-mentioned axially compact power generation device, the above-mentioned axially compact power generation device also includes a rotor 5, which is rotatably mounted through the air intake guide cover 21 and the turbine volute 31; the above-mentioned centrifugal compressor 2 also includes a compressor impeller 22 integrally formed on the rotor 5, and the above-mentioned radial turbine 3 also includes a turbine impeller 39 integrally formed on the rotor 5.

[0082] To ensure that the air pressure inside the cylinder body 11 and the air pressure inside the turbine casing 31 do not affect each other, the centrifugal compressor 2 also includes a diffuser 23 located inside the inlet guide cover 21; the cylinder 1 also includes a sealing plate 16, which is located between the compressor impeller 22 and the turbine impeller 39, and is sandwiched between the diffuser 23 and the turbine casing 31.

[0083] In summary, the axially compact power generation device of this invention can significantly reduce heat loss and insulation layer thickness, improve the overall axial compactness of the structure, save power generation costs, and reduce manufacturing costs. Therefore, this invention effectively overcomes the various shortcomings of the prior art and has high industrial application value.

[0084] The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in the present invention should still be covered by the claims of the present invention.

Claims

1. An axially compact power generation device, characterized in that, include: Cylinder (1), cylinder (1) includes a cylinder body (11) that runs through the cylinder in the axial direction. The two ports of the cylinder body (11) are the first port and the second port, respectively. The inner peripheral wall of the cylinder body (11) is provided with a support (12) and a limiting member (13). The outer peripheral wall of the cylinder body (11) is provided with a compressor exhaust pipe (14) and a turbine intake pipe (15) that are both used to access the heat source. The compressor exhaust pipe (14) is connected to the inner cavity of the cylinder body (11). Centrifugal compressor (2), the centrifugal compressor (2) includes an air inlet guide cover (21), the air inlet guide cover (21) is located at the first port of the cylinder body (11); The radial turbine (3) includes a turbine housing (31), a housing intake pipe (32), a housing exhaust pipe (33), and a baffle plate (34). The outer peripheral wall of the turbine housing (31) is provided with an overlapping member (35) supported by the support member (12) and a positioning member (36) constrained by the limiting member (13). The two ends of the housing intake pipe (32) are respectively connected to the turbine housing (31) and the turbine intake pipe (15). The housing exhaust pipe (33) is connected to the turbine housing (31). The baffle plate (34) is located at the second port of the cylinder body (11) and is airtightly passed through by the housing exhaust pipe (33).

2. The axially compact power generation device according to claim 1, characterized in that: The cylinder body (11) includes a lower cylinder body (111) and an upper cylinder body (112) that are connected vertically; the number of the support members (12) is two and they are symmetrically arranged on the lower cylinder body (111) near the cylinder split surface; the limiting member (13) is located at the bottom of the lower cylinder body (111).

3. The axially compact power generation device according to claim 1, characterized in that: One end of the volute intake pipe (32) is integrally formed on the turbine volute (31), and the other end is provided with a snap-fit ​​ring pipe (37); the turbine intake pipe (15) is provided with an annular groove (151) at the end facing the turbine volute (31), and the annular groove (151) is inserted into the snap-fit ​​ring pipe (37).

4. The axially compact power generation device according to claim 3, characterized in that: The snap-fit ​​ring tube (37) is detachably connected to the volute intake tube (32) via the fastening ring tube (38).

5. The axially compact power generation device according to claim 4, characterized in that: The fastening ring tube (38) includes a threaded tube section (381) and a clamping tube section (382). The threaded tube section (381) is threadedly connected to the volute intake pipe (32). The clamping ring tube (37) includes an abutting tube section (371) and a plugging tube section (372). The abutting tube section (371) is clamped between the port of the turbine intake pipe (15) and the clamping tube section (382). The plugging tube section (372) is inserted into the annular groove (151).

6. The axially compact power generation device according to claim 1, characterized in that: The axially compact power generation device also includes an axial exhaust device connected to the volute exhaust pipe (33).

7. The axially compact power generation device according to claim 1, characterized in that: The axially compact power generation device also includes a circumferential exhaust device (4), which is connected to the volute exhaust pipe (33).

8. The axially compact power generation device according to claim 7, characterized in that: The circumferential exhaust device (4) includes a circumferential shroud (41) and a circumferential exhaust pipe (42). The circumferential shroud (41) is located at the second port of the cylinder body (11), and the circumferential exhaust pipe (42) is located on the outer circumferential wall of the circumferential shroud (41) and communicates with the inner cavity of the circumferential shroud (41).

9. The axially compact power generation device according to claim 1, characterized in that: The axial compact power generation device also includes a rotor (5), which rotates through the air intake guide cover (21) and the turbine casing (31); the centrifugal compressor (2) also includes a compressor impeller (22) integrally formed on the rotor (5), and the radial turbine (3) also includes a turbine impeller (39) integrally formed on the rotor (5).

10. The axially compact power generation device according to claim 9, characterized in that: The centrifugal compressor (2) also includes a diffuser (23) located inside the air inlet guide cover (21); the cylinder (1) also includes a sealing plate (16), which is located between the compressor impeller (22) and the turbine impeller (39) and is sandwiched between the diffuser (23) and the turbine volute (31).

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