A variable cross-section nozzle ring assembly and booster for a hydrogen fuel cell air compressor

Abstract

This application discloses a variable cross-section nozzle ring assembly and a booster for a hydrogen fuel cell air compressor, including a mounting plate and blades and a fork respectively disposed on both sides of the mounting plate. The blades are connected to the forks via blade rods. The mounting plate has mounting holes, through which the blade rods pass. A gap exists between the outer surface of the blade rods and the mounting holes, allowing water to pass through. Rotation of the forks drives the blades to rotate via the blade rods. By adding a variable cross-section nozzle ring, the flow rate of exhaust gas energy recovery can be adjusted in real time, cooperating with the turbine of the fuel cell for boosting. This ensures that the booster meets the boosting requirements while maintaining high efficiency of the turbine across the entire power range, and also keeps the fuel cell at its optimal power state, minimizing the parasitic power ratio of the booster section.

Description

Technical Field

[0001] This application relates to the field of hydrogen fuel cells, and in particular to a variable cross-section nozzle ring assembly and booster for a hydrogen fuel cell air compressor. Background Technology

[0002] Hydrogen fuel cells are increasingly being used in the new energy field. To achieve smaller battery size and higher power, it is necessary to pressurize the air participating in the fuel cell reaction and increase the oxygen content. Currently, hydrogen fuel cell air compression systems generally use a two-stage turbocharger, which is an electric turbocharger. Its power supply is directly obtained from the vehicle's battery or fuel cell, thus resulting in significant parasitic power.

[0003] Chinese patent application “Apparatus with a turbocharger for charging a fuel cell”, application number: CN201910439819.0, discloses that: the fuel cell is preferably a hydrogen-operated fuel cell, wherein the compressor is effectively driven to the turbine of the turbocharger via a shaft, the turbine being driven by the exhaust flow of the fuel cell, and furthermore, the turbocharger is effectively driven to the motor via the shaft, wherein the mounting of the turbocharger shaft is formed by a gas- or air-lubricated mounting.

[0004] After the hydrogen-oxygen reaction in a hydrogen fuel cell reactor, a portion of the high-temperature air and exhaust gas is emitted without being utilized. While existing patents utilize the energy from this exhaust gas, their turbocharger flow channel cross-section is fixed, limiting conversion efficiency to a specific power range. This prevents the turbine from maintaining high efficiency across the entire power range, and also prevents the fuel cell from operating at its optimal power level throughout. To better utilize the exhaust gas energy of the fuel cell, and considering the actual structure and working principle of the hydrogen fuel cell, a suitable nozzle ring assembly is designed. This incorporates a variable-section turbocharger into the hydrogen fuel cell's pressurization process, ensuring the turbine remains at high efficiency and thus guaranteeing the fuel cell is always at its optimal power level. Summary of the Invention

[0005] The technical problem to be solved by this application is to provide a variable cross section nozzle ring assembly and a booster for a hydrogen fuel cell air compressor. By adding a variable cross section nozzle ring, the flow rate of exhaust gas energy recovery can be adjusted in real time. In conjunction with the turbine of the fuel cell, the booster can be boosted while the turbine maintains a high efficiency state across the entire power range, and the fuel cell can always be in the optimal power state, thereby minimizing the parasitic power ratio of the booster section.

[0006] The technical solution adopted in this application is: a variable cross-section nozzle ring assembly for a hydrogen fuel cell air compressor, including a mounting plate and blades and a shift fork respectively disposed on both sides of the mounting plate. The blades are connected to the shift fork through blade rods. The mounting plate has mounting holes, and the blade rods pass through the mounting holes. There is a gap between the outer surface of the blade rods and the mounting holes, through which water can pass. The rotation of the shift fork drives the blades to rotate through the blade rods.

[0007] Compared with existing technologies, the advantages of this application are as follows: It features rotatable and adjustable blades. The rotation of the blades changes the cross-section of the nozzle ring, thereby enabling the utilization of the fuel cell's exhaust gas energy. The gas produced by a hydrogen fuel cell reactor contains a large amount of water, and the ambient temperature is approximately 100°C. However, the exhaust gas utilized by the fuel cell has a high water content, making it easy for a water film to form between the components of the nozzle ring assembly, which serves as the adjustment mechanism. If the gap between the blade and the mounting hole of the mounting plate is too small, water will accumulate on the walls of the blade and mounting plate holes and cannot be discharged. This accumulated water will freeze at low temperatures, causing the nozzle ring assembly to malfunction. This application provides a gap between the blade and the mounting hole that allows water to pass through. During operation, water enters and forms a water film within the gap, effectively reducing frictional losses. In a static state, the rotation of the turbine blades blows out the water at the mounting hole location in the nozzle ring assembly, preventing water accumulation between the blade and the mounting hole, thus preventing freezing at low temperatures. Therefore, this application can be applied to hydrogen fuel cells, and by adjusting the angle of the blades, the cross-section of the nozzle ring assembly can be made variable. The flow rate of exhaust gas energy recovery can be adjusted in real time, and it can be used in conjunction with the turbine of the fuel cell to boost the pressure. This allows the turbocharger to meet the boosting requirements while maintaining high efficiency across the entire power range, and also keeps the fuel cell in its optimal power state, thereby minimizing the parasitic power ratio of the boosting section.

[0008] Specifically, the mounting plate has multiple blades distributed on one side, and the shift fork is configured to correspond one-to-one with each blade. The angle of the blades determines the cross-section of the nozzle ring, thereby determining the amount of exhaust gas that passes through.

[0009] Another concept of this application is to ensure the consistency of the nozzle ring drive by limiting the rotation of the blade around its axis during rotation through the mounting hole, so as not to produce wobbling.

[0010] In some embodiments of this application, the blade surface is provided with at least one raised ridge, which contacts the wall surface of the mounting hole. By providing a raised ridge on the blade surface, this application ensures that the blade can contact the wall surface of the mounting hole, allowing the mounting hole to limit radial movement of the blade. Furthermore, a gap exists between the wall surface of the mounting hole and the outer surface of the blade, allowing water to pass through.

[0011] Preferably, the convex ridge is arranged along the axial direction of the blade rod to ensure that accumulated water can pass smoothly through the mounting hole.

[0012] Preferably, the blade surface has four evenly distributed raised ridges. This ensures stable rotation of the blade within the mounting hole.

[0013] In some embodiments of this application, at least one raised ridge is provided on the inner wall of the mounting hole, and the raised ridge contacts the blade rod. The raised ridge is arranged along the axial direction of the mounting hole. By providing a raised ridge on the surface of the mounting hole, this application achieves a similar effect to providing a raised ridge on the surface of the blade rod, thereby restricting the radial movement of the blade rod and allowing water to pass through smoothly.

[0014] Preferably, the inner wall of the mounting hole has four evenly distributed raised ridges. This ensures that the blade rotates stably within the mounting hole.

[0015] In some embodiments of this application, the blade surface is provided with at least one groove, which extends through both ends of the mounting hole, and the outer circumferential surface of the blade contacts the wall surface of the mounting hole. In this embodiment, the diameter of the blade is adapted to the inner diameter of the mounting hole, and the mounting hole can limit the radial sway of the blade. The groove creates a gap between the wall surface of the mounting hole and the outer surface of the blade, allowing water to pass through the gap. Preferably, the groove is arranged along the axial direction of the blade. Of course, the groove can also be designed in a curved shape, but the drainage effect will be poor.

[0016] Preferably, the blade surface has four grooves evenly distributed. This ensures that water is evenly distributed around the outer periphery of the blade and also balances the force exerted by the water flow on the blade.

[0017] In some embodiments of this application, the mounting hole wall is provided with at least one groove, the groove extending through both ends of the mounting hole, and the outer circumferential surface of the blade contacting the mounting hole wall. In this embodiment, the diameter of the blade is adapted to the inner diameter of the mounting hole, and the mounting hole can limit the radial sway of the blade. The groove creates a gap between the inner wall of the mounting hole and the outer surface of the blade, allowing water to pass through the gap. The groove is arranged axially along the mounting hole.

[0018] Preferably, the mounting hole has four grooves evenly distributed on its wall surface. This ensures that water is evenly distributed around the outer periphery of the blade and also balances the force exerted by the water flow on the blade.

[0019] In some embodiments of this application, the first end of the blade rod extends through the mounting groove and connects to the shift fork. The shift fork rotates about the axis of the blade rod, and the shift fork drives the blade rod to rotate synchronously. That is, there is no relative circumferential movement between the shift fork and the blade rod.

[0020] In some embodiments of this application, the second end of the blade rod is connected to the blade, and the blade rod and blade are integrally formed. This results in good structural strength between the blade and the blade rod.

[0021] In some embodiments of this application, the actuating disk is sleeved on the mounting disk, the actuating disk and the mounting disk are coaxially arranged, and the actuating disk can rotate on the mounting disk.

[0022] Specifically, the mounting plate has a stepped frustum structure, comprising an inner ring and an outer ring that overlap. The actuating disc is fitted around the outer circumference of the inner ring, and the actuating disc is located on the outer ring. Rotation of the actuating disc means rotation around the outer circumference of the inner ring.

[0023] In some embodiments of this application, the surface of the actuating disc has multiple slots, each corresponding to a shift fork. The first end of the shift fork is connected to the blade rod, and the second end of the shift fork is installed within a slot. Rotation of the actuating disc drives the shift fork to rotate around the blade rod axis through the slots.

[0024] In some embodiments of this application, the mounting plate is further provided with a transmission component, which drives the dial plate to rotate.

[0025] Specifically, the transmission assembly includes a transmission shaft and a bushing or bearing sleeved outside the transmission shaft, wherein the bushing or bearing is provided with a sealing structure.

[0026] Since the vehicle may continue to operate using the battery even when the hydrogen fuel cell reactor has stopped, the turbocharger, due to pressure imbalance, cannot prevent significant water seepage into the motor. Therefore, wading requirements need to be considered. During wading, external water must not seep into the turbocharger to prevent a short circuit in the drive motor. To this end, this application employs bearings or bushings with sealing structures to meet wading sealing requirements. The primary function of the bearings and bushings is also to prevent compressed gas leakage; leakage at the shaft end would cause a drop in gas pressure.

[0027] In some embodiments of this application, the transmission assembly further includes a connecting rod and a connecting member. A first end of the transmission shaft is connected to the connecting member, and a second end of the transmission shaft is connected to the connecting rod. The connecting rod is connected to a power device; rotation of the connecting rod drives the transmission shaft to rotate synchronously, and rotation of the transmission shaft drives the connecting member to rotate.

[0028] The transmission assembly has a U-shaped longitudinal section. This means that the relative positions of the connecting parts and the connecting rod are always synchronized. In actual production, the connecting rod, connecting parts, and transmission shaft can be fixedly connected, or even made into a single structure.

[0029] In some embodiments of this application, the structure of the connector is the same as that of the shift fork, with one end of the connector embedded in the shift disk, and the rotation of the connector causing the shift disk to rotate.

[0030] In some embodiments of this application, the drive shaft is fitted with two bearings. The bearings enclose the outer circumferential surface of the drive shaft exposed outside the connecting rod and connector, satisfying the requirement for a water-resistant seal of the drive shaft, and also reducing the resistance when the drive shaft rotates.

[0031] In some embodiments of this application, the application also includes a rear cover, on which the mounting plate is mounted, the mounting plate and the rear cover are arranged parallel to each other, and there is a gap between the mounting plate and the rear cover to accommodate the blade.

[0032] Specifically, the rear cover and the mounting plate are connected by at least three mounting posts. Preferably, the rear cover and the mounting plate are connected by three mounting posts, which are evenly distributed on the rear cover and form an equilateral triangle. When setting the position of the mounting posts, it is important to avoid the area where the blades rotate to prevent interference with blade operation.

[0033] A turbocharger includes a turbine and a nozzle ring assembly. The turbocharger of this application features a variable cross-section, which can adjust the flow rate of exhaust gas energy recovery in real time. It works in conjunction with the turbine of the fuel cell to provide boost, ensuring that the turbocharger meets boost requirements while maintaining high efficiency across the entire power range. It also keeps the fuel cell at its optimal power level, minimizing the parasitic power ratio of the boost section. Attached Figure Description

[0034] The present application will be described in further detail below with reference to the accompanying drawings and preferred embodiments. However, those skilled in the art will understand that these drawings are drawn only for the purpose of explaining the preferred embodiments and therefore should not be construed as limiting the scope of the present application. Furthermore, unless specifically indicated, the drawings are only schematic representations of the composition or structure of the described objects and may contain exaggerated depictions, and the drawings are not necessarily drawn to scale.

[0035] Figure 1 This is a schematic diagram of the structure of this application;

[0036] Figure 2 This is a top view of this application;

[0037] Figure 3 for Figure 2 Sectional view of section AA;

[0038] Figure 4 This is a schematic diagram of the structure of the blade in this application;

[0039] Figure 5 This is a schematic diagram of the blade structure of Embodiment 2 of this application;

[0040] Figure 6 This is a schematic diagram of the blade structure in Embodiment 4 of this application.

[0041] The specific annotations in the attached drawings are as follows: 1. Actuating disc; 2. Mounting disc; 2a. Inner ring; 2b. Outer ring; 3. Blade; 4. Shift fork; 5. Mounting hole; 6. Blade rod; 7. Raised ridge; 8. Groove; 9. Slot; 10. Drive shaft; 11. Bearing; 12. Connecting rod; 13. Connecting piece; 14. Rear cover; 15. Mounting post. Detailed Implementation

[0042] The present application will now be described in detail with reference to the accompanying drawings.

[0043] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0044] A variable cross-section nozzle ring assembly for a hydrogen fuel cell air compressor, as described in Embodiment 1. Figure 1 The device includes a mounting plate 2, and blades 3 and a fork 4 respectively disposed on both sides of the mounting plate 2. The blades 3 are connected to the fork 4 via blade rods 6. The mounting plate 2 has mounting holes 5, through which the blade rods 6 pass. There is a gap between the outer surface of the blade rods 6 and the mounting holes 5, allowing water to pass through. The rotation of the fork 4 drives the blade rods 6, which in turn drives the blades 3 to rotate. This gap can be formed by textured surfaces on the blade rods 6, structural optimization of the surface of the blade rods 6 or the wall of the mounting holes 5, or even simply by changes in size, as long as a gap for water to pass through exists between them. During operation, water enters and forms a water film within the gap, effectively reducing frictional losses. In a static state, the rotation of the turbine blades 3 blows out the water at the mounting holes 5 in the nozzle ring assembly, preventing water accumulation between the blade rods 6 and the mounting holes 5, thus preventing icing in low-temperature environments. Therefore, this application can be used in hydrogen fuel cells, and the angle of the blades 3 can be adjusted by rotating the disk 1, thereby achieving a variable cross-section of the nozzle ring assembly.

[0045] Example 2, as Figure 5 As shown, the blade 6 has at least one protruding ridge 7 on its surface, which contacts the wall of the mounting hole 5. This application, by providing the protruding ridge 7 on the surface of the blade 6, ensures that the blade 6 can contact the wall of the mounting hole 5, allowing the mounting hole 5 to limit the radial movement of the blade 6. Furthermore, it creates a gap between the wall of the mounting hole 5 and the outer surface of the blade 6, allowing water to pass through. Preferably, the protruding ridge 7 is arranged along the axial direction of the blade 6 to ensure that accumulated water can smoothly pass through the mounting hole 5.

[0046] Preferably, the blade rod 6 has four evenly distributed raised ridges 7 on its surface. This ensures that the blade rod 6 rotates stably within the mounting hole 5.

[0047] The rest of the contents of Example 2 are the same as those of Example 1.

[0048] In embodiment three, at least one protruding ridge 7 is provided on the inner wall of the mounting hole 5, and the protruding ridge 7 contacts the blade rod 6. The protruding ridge 7 is arranged along the axial direction of the mounting hole 5 to ensure that water can pass smoothly through the mounting hole 5. This application achieves a similar effect to providing a protruding ridge 7 on the surface of the mounting hole 5 as providing a protruding ridge 7 on the surface of the blade rod 6, thereby restricting the radial movement of the blade rod 6 and allowing water to pass smoothly.

[0049] Preferably, the inner wall of the mounting hole 5 has four evenly distributed raised ridges 7. This ensures that the blade 6 rotates stably within the mounting hole 5.

[0050] The rest of the contents of Example 3 are the same as those of Example 1.

[0051] Example 4, as Figure 6 As shown, the blade 6 has at least one groove 8 on its surface, which extends through both ends of the mounting hole 5, and the outer circumferential surface of the blade 6 contacts the wall of the mounting hole 5. Preferably, the groove 8 is arranged along the axial direction of the blade 6. Of course, the groove 8 can also be designed in a curved shape, but the drainage effect will be poor.

[0052] In this embodiment, the diameter of the blade 6 is adapted to the inner diameter of the mounting hole 5, which helps to limit the radial sway of the blade 6. The groove 8 creates a gap between the wall of the mounting hole 5 and the outer surface of the blade 6, allowing water to pass through the gap in the groove 8.

[0053] Preferably, the blade 6 has four grooves 8 evenly distributed on its surface. This ensures that water is evenly distributed around the outer periphery of the blade 6 and also balances the force exerted by the water flow on the blade 6.

[0054] The rest of the contents of Example 4 are the same as those of Example 1.

[0055] In embodiment five, the mounting hole 5 has at least one groove 8 on its wall surface, with the groove 8 extending through both ends of the mounting hole 5. The outer circumferential surface of the blade 6 contacts the wall surface of the mounting hole 5. The groove 8 is arranged along the axial direction of the mounting hole 5. In this embodiment, the diameter of the blade 6 is adapted to the inner diameter of the mounting hole 5, and the mounting hole 5 can limit the radial sway of the blade 6. The groove 8 creates a gap between the inner wall of the mounting hole 5 and the outer surface of the blade 6, allowing water to pass through the gap in the groove 8.

[0056] Preferably, the mounting hole 5 has four grooves 8 evenly distributed on its wall surface. This ensures that water is evenly distributed around the outer periphery of the blade 6 and also balances the force exerted by the water flow on the blade 6.

[0057] The rest of the content of Example 5 is the same as that of Example 1.

[0058] In Example 6, the first end of the blade rod 6 passes through the mounting groove and connects to the shift fork 4. The shift fork 4 rotates around the axis of the blade rod 6, and the shift fork 4 drives the blade rod 6 to rotate synchronously. That is, there is no relative circumferential movement between the shift fork 4 and the blade rod 6.

[0059] The second end of the blade stalk 6 is connected to the blade 3, and the blade stalk 6 and the blade 3 are integrally formed. This ensures good structural strength between the blade 3 and the blade stalk 6.

[0060] This application also includes an actuating disk 1, which is sleeved on a mounting disk 2. The actuating disk 1 and the mounting disk 2 are coaxially arranged, and the actuating disk 1 can rotate on the mounting disk 2. Specifically, the mounting disk 2 has a stepped frustum structure, and the mounting disk 2 includes an inner ring 2a and an outer ring 2b that are stacked. The actuating disk 1 is sleeved on the outer circumference of the inner ring 2a, and the actuating disk is located on the outer ring 2b. Rotation of the actuating disk 1 is equivalent to rotation on the outer circumference of the inner ring 2a.

[0061] The actuating disk 1 has multiple slots 9 on its surface, each slot 9 corresponding to a shift fork 4. The first end of the shift fork 4 is connected to the blade rod 6, and the second end of the shift fork 4 is installed in the slot 9. Rotation of the actuating disk 1 drives the shift fork 4 to rotate around the axis of the blade rod 6 through the slots 9.

[0062] The rest of the content of Example 6 is the same as any of the above examples.

[0063] In embodiment seven, the mounting plate 2 is further provided with a transmission assembly, which drives the actuating plate 1 to rotate. Specifically, the transmission assembly includes a transmission shaft 10 and a bushing or bearing 11 sleeved on the transmission shaft 10, and the bushing or bearing 11 is provided with a sealing structure.

[0064] Since the vehicle may continue to operate using the battery even when the hydrogen fuel cell reactor has stopped, the turbocharger, due to pressure imbalance, cannot prevent a large amount of water from seeping into the motor. Therefore, wading requirements need to be considered. During wading, external water must not seep into the turbocharger to prevent a short circuit in the drive motor. For this purpose, this application uses a bearing 11 or bushing with a sealing structure to meet the wading sealing requirements. The main function of the bearing 11 and bushing is also to prevent leakage of compressed gas; leakage at the shaft end would cause a drop in gas pressure.

[0065] The transmission assembly further includes a connecting rod 12 and a connecting member 13. The first end of the transmission shaft 10 is connected to the connecting member 13, and the second end of the transmission shaft 10 is connected to the connecting rod 12. The connecting rod 12 is connected to a power device. The rotation of the connecting rod 12 drives the transmission shaft 10 to rotate synchronously, and the rotation of the transmission shaft 10 drives the connecting member 13 to rotate.

[0066] The longitudinal section of the transmission assembly is U-shaped. That is, the relative positions of the connecting member 13 and the connecting rod 12 are always synchronized. In actual production, the connecting rod 12, the connecting member 13, and the transmission shaft 10 can be fixedly connected, or even made into a single structure.

[0067] The structure of the connector 13 is the same as that of the shift fork 4. One end of the connector 13 is embedded in the shift disk 1, and the rotation of the connector 13 drives the shift disk 1 to rotate.

[0068] Two bearings 11 are fitted around the drive shaft 10. The bearings 11 cover the outer circumference of the drive shaft 10 exposed outside the connecting rod and connecting piece 13, which satisfies the water sealing requirements of the drive shaft 10, and the bearings 11 reduce the resistance when the drive shaft 10 rotates.

[0069] This application also includes a rear cover 14, on which the mounting plate 2 is mounted. The mounting plate 2 and the rear cover 14 are arranged parallel to each other, and there is a gap between the mounting plate 2 and the rear cover 14 to accommodate the blade 3.

[0070] Specifically, the rear cover 14 and the mounting plate 2 are connected by at least three mounting posts 15. Preferably, the rear cover 14 and the mounting plate 2 are connected by three mounting posts 15, which are evenly distributed on the rear cover 14 and form an equilateral triangle. When setting the position of the mounting posts 15, it is necessary to avoid the range of rotation of the blade 3 to prevent affecting the operation of the blade 3.

[0071] The other contents of Example 7 are the same as any of the above examples.

[0072] A turbocharger includes a turbine and a nozzle ring assembly. The nozzle ring assembly is identical to that in any of the above embodiments. The turbocharger of this application features a variable cross-section, allowing real-time adjustment of the exhaust gas energy recovery flow rate. It works in conjunction with the turbine of a fuel cell to provide boost, enabling the turbocharger to meet boosting requirements while reducing the parasitic power ratio of the boosting section.

[0073] The present application has been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of the present application. The descriptions of the embodiments above are only for the purpose of helping to understand the present application and its core ideas. It should be noted that those skilled in the art can make several improvements and modifications to the present application without departing from the principles of the present application, and these improvements and modifications also fall within the protection scope of the claims of the present application.

Claims

1. A variable cross-section nozzle ring assembly for a hydrogen fuel cell air compressor, characterized in that... It includes a mounting plate (2) and blades (3) and forks (4) respectively disposed on both sides of the mounting plate (2). The blades (3) are connected to the forks (4) through blade rods (6). The mounting plate (2) has mounting holes (5). The blade rods (6) pass through the mounting holes (5). There is a gap between the outer surface of the blade rods (6) and the mounting holes (5). Water can pass through the gap. The rotation of the forks (4) drives the blades (3) to rotate through the blade rods (6). It also includes a dial (1), which is sleeved on the mounting plate (2); the mounting plate (2) is provided with a transmission assembly, which drives the dial (1) to rotate; the transmission assembly includes a transmission shaft (10) and a bushing or bearing (11) sleeved outside the transmission shaft (10), and the bushing or bearing (11) is provided with a sealing structure.

2. The variable cross-section nozzle ring assembly for a hydrogen fuel cell air compressor according to claim 1, characterized in that, The blade (6) has at least one protruding ridge (7) on its surface, and the protruding ridge (7) contacts the wall of the mounting hole (5); the protruding ridge (7) is arranged along the axial direction of the blade (6).

3. The variable cross-section nozzle ring assembly for a hydrogen fuel cell air compressor according to claim 1, characterized in that, The inner wall of the mounting hole (5) is provided with at least one protruding ridge (7), which contacts the blade (6); the protruding ridge (7) is provided along the axial direction of the mounting hole (5).

4. A variable cross-section nozzle ring assembly for a hydrogen fuel cell air compressor according to claim 1, characterized in that, The blade (6) has at least one groove (8) on its surface, the groove (8) protruding from both ends of the mounting hole (5), and the outer peripheral surface of the blade (6) is in contact with the wall of the mounting hole (5); the groove (8) is arranged along the axial direction of the blade (6).

5. A variable cross-section nozzle ring assembly for a hydrogen fuel cell air compressor according to claim 1, characterized in that, The mounting hole (5) has at least one groove (8) on its wall surface. The groove (8) extends through both ends of the mounting hole (5). The outer circumferential surface of the blade (6) contacts the wall surface of the mounting hole (5). The groove (8) is arranged along the axial direction of the mounting hole (5).

6. A variable cross-section nozzle ring assembly for a hydrogen fuel cell air compressor according to claim 1, characterized in that, The first end of the blade (6) passes through the mounting groove and connects to the shift fork (4). The shift fork (4) rotates around the axis of the blade (6), and the shift fork (4) drives the blade (6) to rotate synchronously.

7. A variable cross-section nozzle ring assembly for a hydrogen fuel cell air compressor according to claim 1, characterized in that, The actuating disk (1) and the mounting disk (2) are coaxially arranged, and the actuating disk (1) can rotate on the mounting disk (2).

8. A variable cross-section nozzle ring assembly for a hydrogen fuel cell air compressor according to claim 7, characterized in that, The surface of the actuating disk (1) is provided with multiple slots (9), and the slots (9) correspond one-to-one with the shift fork (4); the first end of the shift fork (4) is connected to the blade rod (6), and the second end of the shift fork (4) is installed in the slot (9); the actuating disk (1) rotates through the slot (9) to drive the shift fork (4) to rotate around the axis of the blade rod (6).

9. A booster, characterized in that... Includes a turbine and a nozzle ring assembly as described in any one of claims 1-8.

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