Fluid energy conversion device and construction machine

Abstract

This application relates to the field of fluid energy conversion equipment technology, and discloses a fluid energy conversion device and engineering machinery, including a rotating body, at least one blade component, and at least one connecting assembly. The rotating body is used to output rotational mechanical energy. The blade component has a first axis and a first surface and a second surface arranged opposite to each other. The first axis is axially spaced from the rotating body, and at least one first limiting groove is provided on the second surface. One end of the connecting assembly is rotatably connected to the blade component about the first axis, and the other end of the connecting assembly is connected to the rotating body. The connecting assembly is engaged with the lower limit of the first limiting groove so that the first surface is in the flow-facing state, thereby improving the conversion and utilization rate of fluid energy.

Description

Technical Field

[0001] This application relates to the field of fluid energy conversion equipment technology, specifically to fluid energy conversion devices and engineering machinery. Background Technology

[0002] In related technologies, fluid energy converts mechanical energy into electrical energy through kinetic energy conversion devices. For example, wind energy uses wind turbines to capture airflow to drive blades to rotate and generate electricity. Water flow energy (such as hydropower and tidal energy) converts the kinetic energy of water flow into mechanical energy through water turbines, which then drive generators to generate electricity. Both technologies rely on fluid motion to drive rotors, and the core lies in energy transfer efficiency and equipment design optimization.

[0003] However, the components used for fluid energy conversion have low conversion efficiency, making it impossible to further improve the utilization rate of fluid energy. Utility Model Content

[0004] This application provides a fluid energy conversion device and engineering machinery to improve the conversion and utilization rate of fluid energy.

[0005] On the one hand, this application provides a fluid energy conversion device, including a rotating body, at least one blade component and at least one connecting assembly, the specific scheme of which is as follows.

[0006] The rotating body is used to output rotational mechanical energy; the blade component has a first axis and a first surface and a second surface arranged opposite to each other, the first axis is axially spaced from the rotating body, and at least one first limiting groove is provided on the second surface; one end of the connecting component is rotatably connected to the blade component about the first axis, and the other end of the connecting component is connected to the rotating body; wherein, the connecting component is lowerly limited to cooperate with the first limiting groove, so that the first surface is in the upstream state.

[0007] Beneficial effects: By setting a first limiting groove on the blade component, the blade component and the connecting assembly are rotatably connected around the first axis. The connecting assembly is connected to the rotating body. Through the cooperation between the connecting assembly and the first limiting groove, the first surface of the blade component is in the flow-facing state, thereby providing driving force for the rotating body. As the blade component revolves around the axis of the rotating body, the second surface of the blade component is in the flow-facing state. The fluid acts on the second surface, and the blade component quickly rotates 180° around the first axis. At this time, under the action of the fluid, the first and second surfaces of the blade component are always in a state that is close to parallel with the direction of the fluid, thereby reducing the force of the fluid on the blade component, thereby reducing the resistance of the blade component to the rotating body, thereby improving the conversion efficiency of fluid energy and further improving the utilization rate of fluid energy.

[0008] Meanwhile, the first limiting groove can cooperate with the connecting component, thereby increasing the contact area between the blade component and the connecting component when the blade component is in the upstream state, improving the stability of the blade component relative to the connecting component, reducing the swaying amplitude or deformation of the blade component relative to the connection, and thus improving the conversion and utilization rate of fluid energy.

[0009] In one optional embodiment, the portions of the first surface located on both sides of the first axis are the first part and the second part, the area of ​​the first part is larger than the area of ​​the second part, and the orthographic projection of the first limiting groove on the first surface is located on the first part along the direction perpendicular to the first surface.

[0010] In one optional embodiment, a second limiting groove is further provided on the second surface, and the orthographic projection of the second limiting groove on the first surface is located on the second part along a direction perpendicular to the first surface; wherein, the connecting component can be limited and engaged with the second limiting groove so that the first surface is parallel to the fluid flow direction.

[0011] In one alternative embodiment, the edge of the second part is provided with an extension, and the second limiting groove extends to the extension and penetrates the extension.

[0012] In one alternative embodiment, the extension is tapered in a direction away from the blade component.

[0013] In one optional embodiment, a reinforcing layer is embedded in both the first limiting groove and the inner wall surface of the first limiting groove.

[0014] In one optional embodiment, at least one buffer sheet is provided on the inner wall surface of the first limiting groove and the second limiting groove; and / or, at least one buffer ring is provided on the connecting assembly.

[0015] In one optional embodiment, there are multiple blade components and multiple connecting assemblies. The multiple blade components are arranged at circumferential intervals around the rotating body, and the multiple connecting assemblies are arranged at circumferential intervals around the rotating body and are connected to the multiple blade components one by one.

[0016] In one optional embodiment, the connecting assembly includes a plurality of connectors, which are arranged at intervals along the axial direction of the rotating body and are all rotatably connected to the blade component about the first axis.

[0017] The blade component is provided with a plurality of first limiting grooves at intervals along the axial direction of the rotating body, so as to perform one-to-one limiting cooperation with the plurality of connecting parts.

[0018] On the other hand, this application also provides an engineering machine, including: the fluid energy conversion device in any of the above embodiments. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the specific embodiments or related technologies of this application, the drawings used in the description of the specific embodiments or related technologies will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the structure of a fluid energy conversion device according to an embodiment of this application;

[0021] Figure 2 for Figure 1 A magnified view of a section at point A in the middle;

[0022] Figure 3 This is a schematic diagram of the first surface of a blade component in a fluid energy conversion device according to an embodiment of this application;

[0023] Figure 4 This is a schematic diagram of another fluid energy conversion device according to an embodiment of this application.

[0024] Explanation of reference numerals in the attached figures:

[0025] 1. Rotating body; 2. Blade assembly; 3. Connecting assembly; 4. Detection module;

[0026] 21. First side; 22. Second side; 23. First axis;

[0027] 211. Part One; 212. Part Two; 2121. Extension Section;

[0028] 221. First limiting groove; 222. Second limiting groove; 223. Reinforcing layer; 224. Buffer sheet;

[0029] 31. Buffer ring; 32. Connector. Detailed Implementation

[0030] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0031] It should be noted that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. The terms "installed," "connected," and "linked" should be interpreted broadly, for example, they can be fixed connections, detachable connections, or integral connections; they can be mechanical connections or electrical connections; they can be direct connections or indirect connections through an intermediate medium; they can be internal connections between two elements. The terms "parallel," "perpendicular," and "equal" include the described situation and situations similar to the described situation, the range of which is within an acceptable deviation range, wherein the acceptable deviation range is determined by those skilled in the art taking into account the measurement under discussion and the error associated with the measurement of a particular quantity (i.e., the limitations of the measurement system). For example, "parallel" includes absolute parallelism and approximate parallelism, where an acceptable deviation range for approximate parallelism can be, for example, within 5°; "perpendicular" includes absolute perpendicularity and approximate perpendicularity, where an acceptable deviation range for approximate perpendicularity can also be, for example, within 5°. "Equal" includes absolute equality and approximate equality, where an acceptable deviation range for approximate equality can be, for example, a difference between the two equal items being less than or equal to 5% of either one. Those skilled in the art will understand the specific meaning of the above terms in this application based on the specific circumstances.

[0032] In related technologies, fluid energy converts mechanical energy into electrical energy through kinetic energy conversion devices. For example, wind energy uses wind turbines to capture airflow to drive blades to rotate and generate electricity. Water flow energy (such as hydropower and tidal energy) converts the kinetic energy of water flow into mechanical energy through water turbines, which then drive generators to generate electricity. Both technologies rely on fluid motion to drive rotors, and the core lies in energy transfer efficiency and equipment design optimization.

[0033] However, the components used for fluid energy conversion have low conversion efficiency, making it impossible to further improve the utilization rate of fluid energy.

[0034] To address the aforementioned technical problems, this application provides a fluid energy conversion device and engineering machinery to improve the conversion and utilization rate of fluid energy.

[0035] The following is combined Figures 1 to 4 This describes an embodiment of the present application.

[0036] According to embodiments of this application, in one aspect, a fluid energy conversion device is provided, such as... Figure 1 As shown, it includes a rotating body 1, at least one blade component 2, and at least one connecting assembly 3, with the specific scheme as follows.

[0037] It should be noted that the fluid energy conversion device provided in this application can be a device that uses the fluid energy of water for energy conversion, a device that uses the fluid energy of wind for energy conversion, or any other energy conversion device that uses fluid energy. Figure 1 The direction of the middle arrow indicates the direction of fluid energy flow.

[0038] like Figure 1 As shown, the rotating body 1 is used to output rotational mechanical energy; specifically, the rotating body 1 can be a solid shaft, such as a metal shaft, or... Figure 1 and Figure 4 As shown, the rotating body 1 can also be a hollow tube, such as a steel pipe or a plastic pipe; it can also be other objects that can rotate, and the shape does not necessarily have to be regular, such as a column with a square or polygonal cross-section.

[0039] like Figure 1 or Figure 4 As shown, the number of first blade components 2 can be one or more. The first blade component 2 can be any one of metal blades, plastic blades, composite material blades (such as blades with a metal skeleton inside and lightweight high-strength materials on the outside, such as carbon fiber composite materials, especially at the interface, such as the slot and the shaft connection, which can be metal components). Preferably, it is a high-strength plastic blade, a carbon fiber blade, a lightweight alloy blade, etc. The blade component 2 has a first axis 23 and a first surface 21 and a second surface 22 arranged opposite to each other. The first axis 23 is parallel to the axial distance of the rotating body 1. At least one first limiting groove 221 is provided on the second surface 22. Specifically, the first limiting groove 221 can be straight or curved, and its cross-section can be rectangular, semi-circular, etc. Preferably, the first limiting groove 221 is straight and its cross-section is semi-circular.

[0040] Specifically, the cross-section of the blade component 2 along the first axis 23 can be spindle-shaped, i.e. pointed at both ends. Preferably, the thickness of the blade component 2 is greatest at the first axis 23.

[0041] The first axis 23 and the axis of the rotating body 1 can be set parallel or at an angle. The angle is preferably between 0° and 30°. Specifically, the angle between the first axis 23 and the axis of the rotating body 1 is any one or any two of the following values: 5°, 10°, 15°, 20°, 25° and 30°.

[0042] like Figure 1As shown, the connecting component 3 can be a rod, frame, etc., and can be made of metal or alloy. One end of the connecting component 3 is rotatably connected to the blade component 2 around the first axis 23 via a rotating shaft. The other end of the connecting component 3 is connected to the rotating body 1 by welding or bolting, or other methods such as bonding can be used. For example, high-strength adhesive can be used for bonding.

[0043] Specifically, such as Figure 1 As shown, the part of the connecting component 3 that mates with the first limiting groove 221 is adapted to the shape of the first limiting groove 221.

[0044] Among them, such as Figure 1 As shown, the connecting component 3 is engaged with the lower limit of the first limiting groove 221, so that the first surface 21 is in the flow-facing state; specifically, during the revolution of the blade component 2 around the axis of the rotating body 1 and the rotation of the blade component 2 around the first axis 23, a part of the connecting component 3 enters the first limiting groove 221 to prevent the blade component 2 from rotating.

[0045] More specifically, there are multiple blade components 2 and multiple connecting assemblies 3. Multiple blade components 2 can be rotatably mounted on a single connecting assembly 3 around the first axis 23. Alternatively, as shown below... Figure 1 As shown, there are multiple blade components 2 and multiple connecting components 3. One blade component 2 is rotatably arranged on one connecting component 3 around the first axis 23. Preferably, there are multiple blade components 2 and multiple connecting components 3. One blade component 2 is rotatably arranged on one connecting component 3 around the first axis 23.

[0046] It should be noted that the center of gravity of blade component 2 does not coincide with the first axis 23. This design is used when the rotation axis is horizontally arranged; or, as... Figure 1 and Figure 3 As shown, the areas of the blade components 2 located on both sides of the first axis 23 are different; each blade component 2 has its own first axis 23, which can be applied to situations where the rotating shaft is arranged in any direction.

[0047] Operating principle of fluid energy conversion device: such as Figure 1 As shown, the connecting component 3 can limit the blade component 2 to be in the face of the first surface 21. By using the force of the fluid on the first surface 21, the blade component 2 is pushed to revolve around the axis of the rotating body 1, thereby driving the rotating body 1 to rotate and output rotational mechanical energy.

[0048] like Figure 1As shown, when the blade component 2 is subjected to fluid energy, the connecting assembly 3 disengages from the first limiting groove 221 and rotates 180° (at this time, the first surface 21 of the blade component 2 may not be parallel to the fluid direction and may have a certain angle). The second surface 22 on the blade component 2, which is opposite to the first surface 21, is in the flow-facing state. Subsequently, the first surface 21 and the second surface 22 of the blade component 2 are always in a state parallel or nearly parallel to the fluid direction under the support of fluid energy. This reduces the effective contact area between the second surface 22 and the fluid, thereby reducing the force of the fluid on the blade component 2 and thus reducing the resistance to the rotating body 1.

[0049] like Figure 1 As shown, the connecting component 3 then enters the first limiting groove 221 to limit the blade component 2 and prevent the blade component 2 from rotating relative to the connecting component 3. As the blade component 2 continues to revolve around the axis of the rotating body 1, the blade component 2 is in the flow-facing state. During the flow-facing process, the blade component 2 may suddenly flip over due to the instability of the fluid and start the next cycle.

[0050] In this embodiment, such as Figures 1 to 4 As shown, by providing a first limiting groove 221 on the blade component 2, the blade component 2 and the connecting assembly 3 are rotatably connected around the first axis 23. The connecting assembly 3 is connected to the rotating body 1. Through the cooperation of the connecting assembly 3 and the first limiting groove 221, the first surface 21 of the blade component 2 is in a flow-facing state, thereby providing driving force for the rotating body 1. As the blade component 2 revolves around the axis of the rotating body 1, the second surface 22 of the blade component 2 (may suddenly) be in a flow-facing state. The fluid acts on the second surface 22, and the blade component 2 quickly rotates 180° around the first axis 23. During the process, the blade component 2 may suddenly flip over due to the instability of the fluid (during the flow-facing process, the first surface 21 of the blade component 2 always has an angle with the direction of the fluid energy, which is between 0° and 90° and 180°. If the blade does not flip over during the process, it will definitely flip over naturally at the end). At this time, under the action of the fluid, the first surface 21 and the second surface 22 of the blade component 2 are always in a state that is close to parallel with the direction of the fluid, thereby reducing the force of the fluid on the blade component 2, thereby reducing the resistance of the blade component 2 to the rotating body 1, thereby improving the conversion efficiency of fluid energy and further improving the utilization rate of fluid energy.

[0051] At the same time, such as Figure 1 As shown, the first limiting groove 221 can cooperate with the connecting component 3, thereby increasing the contact area between the blade component 2 and the connecting component 3 when the blade component 2 is in the upstream state, improving the stability of the blade component 2 relative to the connecting component 3, reducing the swaying amplitude or deformation of the blade component 2 relative to the connection, and thus improving the conversion and utilization rate of fluid energy.

[0052] In a specific embodiment, such as Figure 3 As shown, the parts of the first surface 21 located on both sides of the first axis 23 are the first part 211 and the second part 212. The area of ​​the first part 211 is larger than the area of ​​the second part 212. Along the direction perpendicular to the first surface 21, the orthographic projection of the first limiting groove 221 on the first surface 21 is located on the first part 211.

[0053] In specific usage, such as Figure 1 As shown, when the first surface 21 is in the flow-facing state, since the area of ​​the first part 211 is larger than the area of ​​the second part 212, the first limiting groove 221 can be in a cooperating state with the connecting component 3 to limit the blade component 2 and prevent the blade component 2 from rotating around the first axis 23.

[0054] In this embodiment, such as Figure 1 and Figure 3 As shown, the first part 211 and the second part 212 located on both sides of the first axis 23 are used. The area of ​​the first part 211 is larger than that of the second part 212. In the direction perpendicular to the first surface 21, the orthographic projection of the first limiting groove 221 on the first surface 21 is located on the first part 211. This allows the force of the fluid acting on the first part 211 to be greater than the force of the fluid acting on the second part 212 when the first surface 21 of the blade component 2 is in the flow-facing state. The first limiting groove 221 can be used to limit the connection with the connecting component 3. The structure is simple and easy to manufacture.

[0055] In one embodiment, such as Figure 1 and Figure 2 As shown, a second limiting groove 222 is also provided on the second surface 22. Specifically, the second limiting groove 222 can be straight or curved, and its cross-section can be rectangular, semi-circular, or other shapes. Preferably, the second limiting groove is straight and its cross-section is semi-circular. Along the direction perpendicular to the first surface 21, the orthographic projection of the second limiting groove 222 on the first surface 21 is located on the second part 212. The shape of the second limiting groove 222 is adapted to the shape of the connecting component 3.

[0056] Among them, such as Figure 1 and Figure 2 As shown, the connecting component 3 can be matched with the second limiting groove 222 to limit the first surface 21 to be parallel to the fluid flow direction.

[0057] In specific usage, such as Figure 1As shown, when the first surface 21 of the blade component 2 changes from the flow-facing state to the non-flow-facing state, the blade component 2 will rotate 180°. The second limiting groove 222 can limit the blade component 2 to prevent the rotation of the blade component 2 from exceeding 180°, so that the first surface 21 is in the flow-facing state, thereby increasing the resistance of the fluid to the blade component 2 revolving around the rotating body 1, thereby reducing the conversion and utilization rate of fluid energy.

[0058] At the same time, such as Figure 1 As shown, the second limiting groove 222 can cooperate with the connecting component 3 to increase the contact area between the blade component 2 and the connecting component 3, improve the stability of the blade component 2 relative to the connecting component 3, and reduce the swaying amplitude or deformation of the blade component 2 relative to the connection, thereby improving the conversion and utilization rate of fluid energy.

[0059] In one embodiment, such as Figure 4 As shown, the edge of the second part 212 is provided with an extension 2121. Specifically, the extension 2121 can be any shape, such as square, triangle, trapezoid, or streamlined shape that conforms to fluid dynamics. The second limiting groove 222 extends to the extension 2121 and penetrates the extension 2121.

[0060] In specific usage, such as Figure 4 As shown, the extension 2121 can further increase the contact area between the second part 212 and the connecting component 3, improve the stability of the blade component 2 relative to the connecting component 3, reduce the swaying amplitude or deformation of the blade component 2 relative to the connection, thereby improving the conversion and utilization rate of fluid energy.

[0061] In one embodiment, such as Figure 4 As shown, the extension 2121 is tapered in the direction away from the blade component 2, such as trapezoidal or triangular, which can reduce the material used in the blade component 2 and reduce the cost of the blade component 2.

[0062] In one embodiment, such as Figure 2 As shown, a reinforcing layer 223 is embedded in both the first limiting groove 221 and the inner wall surface of the first limiting groove 221. Specifically, the reinforcing layer 223 can be a profile that matches the groove surface of the first limiting groove 221 or the groove surface of the second limiting groove 222 to enhance the strength of the first limiting groove 221 or the second limiting groove 222 and enhance the service life of the blade component 2.

[0063] The reinforcing layer 223 can be a metal layer, such as an iron sheet layer or an aluminum sheet layer, or it can be another wear-resistant material layer, such as a wear-resistant plastic sheet layer.

[0064] In one embodiment, such as Figure 2As shown, at least one buffer sheet 224 is provided on the inner wall surface of the first limiting groove 221 and the second limiting groove 222; specifically, the buffer sheet 224 can be a sheet with elastic compression deformation such as a rubber sheet or a polyurethane foam block. At least one buffer ring 31 is provided on the connecting assembly 3; specifically, the buffer ring 31 is a ring with elastic compression deformation such as a rubber ring or a polyurethane foam ring.

[0065] In this embodiment, such as Figure 2 As shown, by setting the buffer plate 224 and the buffer ring 31, the contact impact force between the connecting component 3 and the first limiting groove 221 or the second limiting groove 222 can be reduced, thereby reducing abnormal noise and vibration.

[0066] In some embodiments not shown, the buffer sheet 224 can be a magnetic sheet, and a corresponding magnetic sheet can also be provided on the connecting component 3 to repel the magnetic sheet located in the first limiting groove 221 or the second limiting groove 222 to form a buffer structure. Specifically, the magnetic sheet can be an electromagnet.

[0067] In one embodiment, such as Figure 1 and Figure 4 As shown, there are multiple blade components 2 and multiple connecting components 3. The multiple blade components 2 are arranged at intervals around the circumference of the rotating body 1, and the multiple connecting components 3 are arranged at intervals around the circumference of the rotating body 1 and are connected to the multiple blade components 2 one by one.

[0068] In this embodiment, such as Figure 1 and Figure 4 As shown, by setting multiple blade components 2 and multiple connecting components 3, multiple driving forces are formed on the rotating body 1, thereby increasing the rotational speed and output torque of the rotating body 1.

[0069] In one embodiment, such as Figure 1 and Figure 4 As shown, the connecting component 3 includes multiple connectors 32. Specifically, the connectors 32 are metal rods. The multiple connectors 32 are arranged at intervals along the axial direction of the rotating body 1, and are all rotatably connected to the blade component 2 around the first axis 23 through the shaft. The blade component 2 is provided with multiple first limiting grooves 221 at intervals along the axial direction of the rotating body 1 to perform corresponding limiting cooperation with the multiple connectors 32.

[0070] Specifically, such as Figure 1 and Figure 4 As shown, multiple connectors 32 in each connecting component 3 can be connected by connecting rods to enhance the deformation resistance of the connecting component 3.

[0071] In this embodiment, such as Figure 1 and Figure 4As shown, the connecting assembly 3 includes multiple connectors 32, which are arranged at intervals along the axial direction of the rotating body 1 and are all rotatably connected to the blade component 2 around the first axis 23 via a shaft. The blade component 2 is provided with multiple first limiting grooves 221 at intervals along the axial direction of the rotating body 1 to perform corresponding limiting cooperation with the multiple connectors 32, which can enhance the contact area between the blade component 2 and the connecting assembly 3, thereby enhancing the stability of the blade component 2 relative to the connecting assembly 3.

[0072] In one embodiment, such as Figure 4 As shown, a detection module 4 is provided on the rotating body 1. The detection module 4 is used to detect information such as the flow rate and direction of the fluid, and is connected to the control module of the fluid energy conversion device to control the operating parameters of the fluid energy conversion device.

[0073] According to an embodiment of this application, in another aspect, an engineering machine is provided, including the fluid energy conversion device in any of the above embodiments.

[0074] Specifically, construction machinery refers to equipment with power generation capabilities, such as hydroelectric generator sets and wind turbine generator sets.

[0075] In this embodiment, since the engineering machinery includes a fluid energy conversion device and has the same technical effect as the fluid energy conversion device, it will not be described in detail here.

[0076] Although embodiments of this application have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of this application, and all such modifications and variations fall within the scope defined by the appended claims.

Claims

1. A fluid energy conversion device, characterized in that, include: Rotating body (1), the rotating body (1) is used to output rotational mechanical energy; At least one blade component (2), the blade component (2) having a first axis (23) and a first surface (21) and a second surface (22) disposed opposite to each other, the first axis (23) being axially spaced from the rotating body (1), and at least one first limiting groove (221) being provided on the second surface (22); At least one connecting component (3), one end of which is rotatably connected to the blade component (2) about the first axis (23), and the other end of which is connected to the rotating body (1); The connecting component (3) cooperates with the lower limit of the first limiting groove (221) so that the first surface (21) is in the flow-facing state.

2. The fluid energy conversion device according to claim 1, characterized in that, The portions of the first surface (21) located on both sides of the first axis (23) are the first part (211) and the second part (212). The area of ​​the first part (211) is larger than the area of ​​the second part (212). Along the direction perpendicular to the first surface (21), the orthographic projection of the first limiting groove (221) on the first surface (21) is located on the first part (211).

3. The fluid energy conversion device according to claims 2 to 1, characterized in that, A second limiting groove (222) is also provided on the second surface (22). Along the direction perpendicular to the first surface (21), the orthographic projection of the second limiting groove (222) on the first surface (21) is located on the second part (212). The connecting component (3) can be positioned and engaged with the second limiting groove (222) so that the first surface (21) is parallel to the fluid flow direction.

4. The fluid energy conversion device according to claim 3, characterized in that, The second part (212) has an extension (2121) on its edge, and the second limiting groove (222) extends to the extension (2121) and penetrates the extension (2121).

5. The fluid energy conversion device according to claim 4, characterized in that, The extension (2121) is tapered in the direction away from the blade component (2).

6. The fluid energy conversion device according to any one of claims 3 to 5, characterized in that, The first limiting groove (221) and the inner wall surface of the first limiting groove (221) are both embedded with a reinforcing layer (223).

7. The fluid energy conversion device according to any one of claims 3 to 5, characterized in that, At least one buffer sheet (224) is provided on the inner wall surface of the first limiting groove (221) and the second limiting groove (222); And / or, at least one buffer ring (31) is provided on the connecting component (3).

8. The fluid energy conversion device according to any one of claims 1 to 5, characterized in that, There are multiple blade components (2) and multiple connecting components (3). The multiple blade components (2) are arranged circumferentially around the rotating body (1), and the multiple connecting components (3) are arranged circumferentially around the rotating body (1) and are connected to the multiple blade components (2) one by one.

9. The fluid energy conversion device according to any one of claims 1 to 5, characterized in that, The connecting assembly (3) includes a plurality of connectors (32), which are arranged at intervals along the axial direction of the rotating body (1) and are all rotatably connected to the blade component (2) about the first axis (23). The blade component (2) is provided with a plurality of first limiting grooves (221) spaced apart along the axial direction of the rotating body (1) to correspond and limit the fit with the plurality of connecting parts (32).

10. An engineering machinery, characterized in that, include: The fluid energy conversion device as described in any one of claims 1 to 9.

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