Variable-section nozzle ring for hydrogen fuel cell air compressor

Abstract

The variable-section nozzle ring for the hydrogen fuel cell air compressor comprises a driving disc and a mounting disc which are coaxially arranged, and the driving disc is rotationally connected to the mounting disc; the driving disc comprises an anti-clamping part and a connecting part which are coaxially arranged, and the anti-clamping part is connected to the inner side of the connecting part; the distance between the opposite radial surfaces of the connecting part and the mounting disc is L1, the distance between the opposite radial surfaces of the anti-blocking part and the mounting disc is L2, and L2gt is greater than or equal to 1; l1, when the driving disc is attached to the mounting disc, the radial surface of the connecting part is attached to the mounting disc, a gap is formed between the radial surface of the anti-clamping part and the mounting disc, the attaching area between the mounting disc and the driving disc is reduced, and the radial surface, opposite to the mounting disc, of the anti-clamping part can obtain axial buoyancy under the action of fluid pressure; clamping stagnation caused by vacuum adsorption between the driving disc and the mounting disc is prevented; a buffer groove is formed in the anti-clamping part, a fluid buffer zone and supporting force can be generated when the opening change direction is changed, and the failure probability of the variable-section nozzle ring is reduced.

Description

Technical Field

[0001] The present application relates to the technical field of superchargers, and in particular to a variable cross-section nozzle ring for a hydrogen fuel cell air compressor. Background Art

[0002] With the progress of social development, new energy vehicles occupy an increasingly higher proportion in the market; among them, hydrogen energy vehicles are mainly hydrogen fuel cell vehicles. Hydrogen fuel cells can improve the power density of batteries. Therefore, in the existing technology, improving the turbocharging technology of fuel vehicles and applying it to hydrogen fuel cell vehicles has become the mainstream technical solution.

[0003] Among them, the core component for applying turbocharging technology to hydrogen fuel cell vehicles is the variable-section nozzle ring, and its current structural design still follows the similar structure of the nozzle ring of fuel vehicles.

[0004] However, in the existing variable cross-section nozzle ring, in the prior art, the drive disk rotates around the mounting disk, the contact area between the inner hole of the drive disk and the shoulder of the mounting disk is large, the movement resistance of the kinematic pair is large, and it is easy to cause failures in the form of wear and jamming of the moving pair of the variable cross-section nozzle ring; especially when the nozzle ring is turned from the maximum opening back to the minimum opening or from the minimum opening to the maximum opening, the inner hole of the drive disk and the shoulder of the mounting disk are more likely to be tightly contacted over a large area under the combined action of driving force and inertia, resulting in large friction and causing the movement to jam, and the jamming principle is similar to that of the bicycle wheel hub brake.

[0005] Therefore, there is room for further improvement in the variable cross-section nozzle ring in the prior art. Summary of the invention

[0006] In view of this, in order to solve the technical problem that the fitting area between the driving disk and the mounting disk of the variable cross-section nozzle ring in the prior art is large, which easily leads to a large-area close contact between the two and thus causes the movement to become stuck, the present application provides a variable cross-section nozzle ring for a hydrogen fuel cell air compressor, which has an anti-stuck portion and a connecting portion on the fitting surface of the driving disk and the mounting disk, and a large distance between the anti-stuck portion and the mounting disk, which can reduce the fitting area at the axial shoulder of the driving disk and the mounting disk, reduce the probability of the driving disk and the mounting disk being stuck, and can effectively improve the working efficiency of the variable cross-section nozzle ring for the hydrogen fuel cell air compressor and reduce its failure probability.

[0007] The present application provides a variable cross-section nozzle ring for a hydrogen fuel cell air compressor, comprising a coaxially arranged drive disk and a mounting disk, wherein the drive disk is rotatably connected to the mounting disk;

[0008] Wherein, the driving disk comprises an anti-stuck portion and a connecting portion which are coaxially arranged, and the anti-stuck portion is connected to the inner side of the connecting portion;

[0009] The distance between the radial surfaces facing each other of the connecting portion and the mounting disk is L1, and the distance between the radial surfaces facing each other of the anti-stuck portion and the mounting disk is L2, wherein L2>L1.

[0010] Compared with the prior art, in the variable cross-section nozzle ring for a hydrogen fuel cell air compressor of the present application, its driving disk is provided with an anti-stuck portion and a connecting portion, the anti-stuck portion is coaxially arranged with the connecting portion, and the anti-stuck portion is arranged on the inner side of the connecting portion, wherein, between the radial end faces facing the mounting disk, the distance L1 between the anti-stuck portion and the mounting disk is smaller than the distance L2 between the connecting portion and the mounting disk, that is, when the driving disk is fitted with the mounting disk, the radial surface of the connecting portion is fitted with the mounting disk, and there is a gap between the radial surface of the anti-stuck portion and the mounting disk, so that the entire driving disk is only fitted with the mounting disk at the connecting portion, which greatly reduces the fitting area between the mounting disk and the driving disk, and at the same time, under the action of fluid pressure, the radial surfaces relative to the anti-stuck portion and the mounting disk will obtain axial buoyancy, which can prevent vacuum adsorption between the driving disk and the mounting disk, thereby avoiding the driving disk and the mounting disk end faces from being tightly fitted to cause jamming, greatly reducing the probability of failure of the variable cross-section nozzle ring for a hydrogen fuel cell air compressor.

[0011] Preferably, in the radial direction, the distance between the radial surfaces of the anti-stuck portion and the mounting plate facing each other gradually increases toward the central axis direction;

[0012] Wherein, the radial surface of the anti-stuck portion facing the mounting disk is a wedge-shaped structure.

[0013] Preferably, the anti-stuck portion and the axial surface close to the central axis are the first end surface, and the radial surface of the anti-stuck portion facing the mounting plate is the second end surface;

[0014] There is an included angle θ between the first end face and the second end face, 90°<θ<180°.

[0015] Preferably, the mounting plate comprises a shaft shoulder portion, and the shaft shoulder portion is used to axially limit the driving plate;

[0016] The driving disc is provided with a mounting hole, and the diameter of the mounting hole is larger than the outer diameter of the shaft shoulder portion.

[0017] Preferably, the axial length of the first end surface is smaller than the axial width of the shaft shoulder;

[0018] There is a distance between the first end surface and the end portion on the same side of the shaft shoulder portion.

[0019] Preferably, a buffer groove is provided on the anti-stuck portion, the buffer groove opens on an axial surface of the anti-stuck portion close to the central axis, and the buffer groove is recessed in a radial direction away from the central axis.

[0020] Preferably, the radial depth of the buffer groove is smaller than the radial length of the anti-stuck portion;

[0021] The axial width of the buffer groove is smaller than the axial length of the axial surface of the anti-stuck portion close to the central axis.

[0022] Preferably, the connection surface between the side wall and the bottom wall inside the buffer groove is a smooth arc surface;

[0023] The buffer groove is located in the middle of the shaft shoulder.

[0024] Preferably, the axial length of the connecting portion is greater than the axial length of the anti-stuck portion;

[0025] The axial length of the connecting portion is greater than the axial length of the shaft shoulder portion.

[0026] Preferably, a travel limit pin is provided on the mounting disk, and a travel groove is provided on the driving disk. The travel limit pin is located in the travel groove. The circumferential length of the travel groove is greater than the diameter of the travel limit pin. The travel limit pin is used to limit the rotational stroke of the driving disk.

[0027] The variable cross-section nozzle ring for a hydrogen fuel cell air compressor of the present application has at least the following technical effects:

[0028] 1. By arranging an anti-stuck portion and a connecting portion on the driving disk, the distance between the anti-stuck portion and the mounting disk is set to be greater than the distance between the connecting portion and the mounting disk, so that when the driving disk and the mounting disk are fitted, the connecting portion and the mounting disk are fitted, and there is a gap between the anti-stuck portion and the mounting disk, so as to prevent vacuum adsorption between the driving disk and the mounting disk, thereby avoiding the end surfaces of the driving disk and the mounting disk from being closely attached to each other and causing stagnation, and greatly reducing the probability of failure of the variable cross-section nozzle ring for the hydrogen fuel cell air compressor;

[0029] 2. By setting the radial surfaces of the anti-stuck part and the mounting disk facing each other as wedge-shaped structures, the distance between the radial surfaces of the anti-stuck part and the mounting disk facing each other in the radial direction gradually increases toward the central axis direction, so that the axial buoyancy of the anti-stuck part is larger, and the fluid can more easily enter between the anti-stuck part and the mounting disk, so that the anti-stuck effect is better;

[0030] 3. By arranging a buffer groove on the anti-stuck part, the buffer groove opens on the axial end face of the anti-stuck part, that is, the buffer groove is opposite to the shaft shoulder. During the rotation process or turning, the buffer groove can absorb the fluid, and can generate a fluid buffer zone and a certain supporting force when the opening direction changes, thereby eliminating the jamming between the driving disk and the mounting disk when turning to the maximum and minimum openings, and reducing the probability of failure of the variable cross-section nozzle ring for the hydrogen fuel cell air compressor. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a schematic diagram of a top view of a variable cross-section nozzle ring for a hydrogen fuel cell air compressor provided in one embodiment of the present application;

[0032] Figure 2 It is a schematic cross-sectional structure diagram of a variable cross-section nozzle ring for a hydrogen fuel cell air compressor provided in one embodiment of the present application;

[0033] Figure 3 yes Figure 2 A magnified schematic diagram of local A.

[0034] Reference numerals: 1. Variable cross-section nozzle ring for hydrogen fuel cell air compressor;

[0035] 11. Mounting plate; 12. Driving plate; 13. Shift fork; 14. Radial positioning pin; 15. Travel limit pin; 16. Distance sleeve; 17. Rear cover; 18. Blade; 19. Blade rod;

[0036] 111, shaft shoulder; 112, mounting portion;

[0037] 121, connecting portion; 122, anti-stuck portion; 123, buffer groove; 124, travel groove; 125, active fork groove; 126, clamping groove; 1221, first end face; 1222, second end face. DETAILED DESCRIPTION

[0038] In order to enable those skilled in the art to better understand the technical solution of the present disclosure, the present disclosure is described in detail, clearly and completely in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present disclosure and are not used to limit the present disclosure.

[0039] In the description of this application, if there is a description of first or second, it is only for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0040] Those skilled in the art should understand that, in the disclosure of the present application, the orientation or positional relationship indicated by terms such as "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", and "outside" are based on the orientation or positional relationship shown in the accompanying drawings, which are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, the above terms should not be understood as limiting the present application.

[0041] The present application is further described in detail below in conjunction with the accompanying drawings. Figures 1 to 3 illustrate.

[0042] The present application provides a variable cross-section nozzle ring for a hydrogen fuel cell air compressor, which is used in a hydrogen fuel cell air compressor of a hydrogen energy vehicle; Figures 1 to 3 As shown, the variable cross-section nozzle ring 1 for the hydrogen fuel cell air compressor of the present application includes a mounting disk 11, a driving disk 12, a blade 18, a blade rod 19 and a fork 13, the driving disk 12 is rotatably connected to the mounting disk 11, the driving disk 12 is coaxially arranged with the mounting disk 11, the inner diameter of the driving disk 12 is smaller than the inner hole of the mounting disk 11, that is, the driving disk 12 is located at the outer edge of the mounting disk 11; wherein the blade rod 19 is axially arranged, the blade rod 19 penetrates the mounting disk 11, and the blade rod 19 is rotatably connected to the mounting disk 11; one end of the blade rod 19 exceeds the surface of the mounting disk 11 and is fixedly connected to the fork 13, and the other end is fixedly connected to the blade 18, and the end of the fork 13 away from the blade rod 19 is clamped with the driving disk 12, and a clamping groove 126 is provided on the driving disk 12, and the fork 13 is located in the clamping groove 126; as shown Figure 1 As shown, the driving disc 12 is provided with an active fork groove 125, and the active fork groove 125 and the clamping groove 126 are distributed on the driving disc 12 at intervals along the circumferential direction. The active fork groove 125 is used to install the active fork 13 mechanism. The active fork 13 mechanism provides power to drive the driving disc 12 to rotate relative to the mounting disc 11, thereby driving the fork 13 to rotate, and the fork 13 drives the blade rod 19 to rotate, further causing the blade 18 to rotate a certain angle, and the size of the fluid channel between adjacent blades 18 is changed, thereby realizing the adjustment of the flow rate and pressure of the exhaust gas from the engine, and realizing the variable cross-section function of the nozzle ring 1.

[0043] It should be noted that the nozzle ring 1 has a maximum opening and a minimum opening when the blade 18 rotates. In this embodiment, the fork 13, the blade 18, and the blade rod 19 are all arranged in multiple groups, wherein the number of the fork 13, the blade 18, and the blade rod 19 is the same, and the multiple groups of blade rods 19 are arranged at equal intervals along the circumference of the mounting plate 11; in actual application, the blade rods 19 can also be arranged at unequal intervals according to the working conditions.

[0044] Specifically, Figures 1 to 3 As shown, in the present application, the mounting plate 11 includes a mounting portion 112 and a shaft shoulder portion 111, the mounting portion 112 is coaxially arranged with the shaft shoulder portion 111, the shaft shoulder portion 111 is axially connected to the side end of the mounting portion 112, and the mounting portion 112 has the same inner diameter as the shaft shoulder portion 111, that is, the mounting portion 112 and the end surface of the shaft shoulder portion 111 close to the central axis are on the same axial plane; wherein, as Figure 3As shown, the radial length of the shaft shoulder 111 is smaller than the axial length of the mounting portion 112; the driving disc 12 is provided with a mounting hole, and the driving disc 12 is sleeved on the outer side of the shaft shoulder 111 through the mounting hole. The shaft shoulder 111 is used to axially limit the driving disc 12. At the same time, the outer diameter of the mounting hole is larger than the outer diameter of the shaft shoulder 111, so as to avoid the inner side wall of the driving disc 12 and the inner side wall of the mounting disc 11 from being closely fitted, thereby ensuring the relative rotation of the driving disc 12 and the mounting disc 11; wherein, as Figure 2 , Figure 3 As shown, the driving disk 12 includes a coaxially arranged anti-stuck portion 122 and a connecting portion 121, the anti-stuck portion 122 is connected to the inner end surface of the connecting portion 121, and the radial surfaces on the same side of the anti-stuck portion 122 and the connecting portion 121 face the radial surface of the mounting portion 112 close to the shaft shoulder portion 111, that is, the driving disk 12 is connected to the side of the shaft shoulder portion 111 of the mounting disk 11; wherein, the distance between the radial surfaces facing each other of the connecting portion 121 and the mounting portion 112 is L1, and the distance between the radial surfaces facing each other of the anti-stuck portion 122 and the mounting portion 112 is L2, wherein L2>L1, that is, when the driving disk 12 is fitted with the mounting disk 11, the connecting portion 121 The radial surface of the anti-stuck portion 122 fits with the mounting disk 11, and there is a gap between the radial surface of the anti-stuck portion 122 and the mounting disk 11, so that the entire driving disk 12 only fits with the mounting disk 11 at the connecting portion 121, which greatly reduces the fitting area between the mounting disk 11 and the driving disk 12. At the same time, under the action of fluid pressure, the radial surface of the anti-stuck portion 122 relative to the mounting disk 11 will obtain axial buoyancy, which can prevent vacuum adsorption between the driving disk 12 and the mounting disk 11, thereby avoiding the driving disk 12 and the mounting disk 11 end faces from being tightly attached to each other and causing jamming, greatly reducing the probability of failure of the variable-section nozzle ring 1 for a hydrogen fuel cell air compressor.

[0045] Further, such as Figure 3As shown, the anti-stuck portion 122 and the axial surface close to the central axis are the first end surface 1221, and the radial surface of the anti-stuck portion 122 facing the mounting plate 11 is the second end surface 1222, that is, the first end surface 1221 is opposite to the shaft shoulder portion 111, and the second end surface 1222 is opposite to the mounting portion 112; wherein, in the radial direction, the distance between the radial surfaces of the anti-stuck portion 122 and the mounting plate 11 facing each other gradually increases toward the central axis direction, that is, when the connecting portion 121 is fitted with the mounting portion 112, the spacing between the second end surface 1222 and the mounting portion 112 gradually increases from the outside to the inside along the radial direction, so that the second end surface The gap between 1222 and the mounting portion 112 changes in radial direction, and the opening is largest at the end close to the shoulder portion 111. At the same time, the second end face 1222 is not completely arranged along the radial direction, but has a slight angle with the radial direction. The larger opening end makes it easier for the fluid to enter between the mounting portion 112 and the anti-stuck portion 122, and the contact area between the first end face 1221 and the fluid is larger, so that the anti-stuck portion 122 is subjected to greater axial buoyancy and is more susceptible to axial buoyancy, thereby reducing the probability of vacuum adsorption between the drive disk 12 and the mounting disk 11 and reducing the probability of jamming between the two.

[0046] Among them, the radial surface facing the anti-stuck part 122 and the mounting disk 11 is a wedge-shaped structure, that is, the second end face 1222 is a wedge-shaped surface, and there is an angle θ between the second end face 1222 and the first end face 1221, wherein 90°<θ<180°. Such an angle setting can increase the axial buoyancy effect of the anti-stuck part 122, and at the same time can also ensure the maintenance of the normal working state between the driving disk 12 and the mounting disk 11; wherein θ can be set to any one of 91°, 92°93°, 94°, 95°, 96°, 97°, 98°, 99°, and 100°.

[0047] Further, such as Figure 3 As shown, the connecting surface between the first end face 1221 and the second end face 1222 is a smooth arched curved surface to avoid the formation of sharp corners, which can reduce the resistance to fluid flow and has a better guiding effect, making it easier for the fluid to enter between the anti-stuck portion 122 and the mounting portion 112, and the probability of jamming between the drive disk 12 and the mounting disk 11 is further reduced.

[0048] Furthermore, in this embodiment, if Figure 3As shown, the axial length of the first end face 1221 is smaller than the axial width of the shoulder portion 111, and there is a spacing between the first end face 1221 and the end on the same side of the shoulder portion 111, wherein, since the diameter of the mounting hole of the drive disk 12 is larger than the outer diameter of the shoulder portion 111, there is a gap between the first end face 1221 and the shoulder portion 111 for fluid to pass through; and there is a spacing between the end of the first end face 1221 and the end on the same side of the shoulder portion 111, so that both axial ends of the shoulder portion 111 will not fit with other components, and a gap is always provided for the passage of fluid, so that the fluid can enter between the anti-stuck portion 122 and the mounting portion 112, provide axial buoyancy to the drive disk 12, and avoid the drive disk 12 and the mounting disk 11 from being tightly stuck.

[0049] In this application, if Figure 2 , Figure 3 As shown, the axial length of the connecting portion 121 is greater than the axial length of the anti-stuck portion 122, and the connecting portion 121 can shield the outer side of the fork 13, reducing the probability of external impurities entering between the fork 13 and the driving disk 12; at the same time, the axial length of the connecting portion 121 is greater than the axial length of the shaft shoulder 111, so that the fork 13 has an installation space, so that the flatness of the surface of the nozzle ring 1 fork 13 is more uniform, reducing the cost of manufacturing materials and improving the aesthetics; wherein, as Figure 3 As shown, there is a gap between the outer side of the fork 13 and the inner side of the connecting portion 121, so that the liquid can enter from the gap between the fork 13 and the anti-stuck portion 122, then enter between the anti-stuck portion 122 and the shaft shoulder portion 111, and finally flow into between the anti-stuck portion 122 and the mounting portion 112, providing an axial force on the drive disk 12 to prevent the drive disk 12 and the mounting disk 11 from being stuck tightly.

[0050] On the basis of any of the above embodiments, the variable cross-section nozzle ring 1 for the hydrogen fuel cell air compressor is further expanded; Figure 2 , Figure 3 As shown, in the present embodiment, a buffer groove 123 is provided on the anti-stuck portion 122, and the buffer groove 123 is open on the axial surface of the anti-stuck portion 122 close to the central axis, and the buffer groove 123 is recessed radially in the direction away from the central axis, that is, the opening of the buffer groove 123 is opposite to the shaft shoulder portion 111; the buffer groove 123 can absorb fluid during the rotation of the driving disk 12, and spray fluid during turning, thereby generating a fluid buffer zone when the opening direction changes, providing a certain supporting force, thereby eliminating the jamming between the driving disk 12 and the mounting disk 11 during the maximum and minimum opening turns, avoiding the braking effect of the bicycle hub brake between the driving disk 12 and the mounting disk 11, thereby reducing the probability of failure of the variable cross-section nozzle ring 1 for the hydrogen fuel cell air compressor.

[0051] Further, such as Figure 3As shown, the radial depth of the buffer groove 123 is smaller than the radial length of the anti-stuck portion 122, and the axial width of the buffer groove 123 is smaller than the axial length of the first end face 1221 of the anti-stuck portion 122, so as to avoid the buffer groove 123 being too deep or too wide and affecting the structural strength of the anti-stuck portion 122; at the same time, the connecting surface between the side wall and the bottom wall inside the buffer groove 123 is a smooth arc surface, that is, there is no sharp corner in the buffer groove 123, thereby reducing the obstruction to the fluid; and the buffer groove 123 is located in the middle position of the shoulder portion 111, and the thickness of the anti-stuck portions 122 on both sides of the buffer groove 123 is roughly the same, so that when the buffer groove 123 generates a buffer zone and a supporting force, the effect on the drive disk 12 is as balanced as possible, the eccentricity is reduced, and the tilting of the drive disk 12 is avoided.

[0052] On the basis of any of the above embodiments, the variable cross-section nozzle ring 1 for the hydrogen fuel cell air compressor is further expanded; Figure 1 , Figure 2 As shown, a travel limit pin 15 is provided on the mounting disk 11, and a travel groove 124 is provided on the driving disk 12. The travel limit pin 15 is at least partially connected to the mounting disk 11, and at least partially extends axially and is located in the formed groove. The circumferential length of the travel groove 124 is greater than the diameter of the travel limit pin 15. The travel limit pin 15 is used to limit the rotational stroke of the driving disk 12, thereby limiting the size of the opening of the variable cross-section nozzle ring 1 for the hydrogen fuel cell air compressor, which meets the working conditions of the hydrogen fuel cell air compressor of hydrogen energy vehicles.

[0053] like Figure 1 , Figure 2 As shown, the mounting disk 11 is further provided with a radial positioning pin 14 , which is connected to the mounting disk 11 and extends axially beyond the end surface of the driving disk 12 . The mounting disk 11 is radially positioned and installed with the air compressor through the radial positioning pin 14 .

[0054] like Figure 1 , Figure 2 As shown, the variable cross-section nozzle ring 1 for the hydrogen fuel cell air compressor further includes a distance sleeve 16 and a rear cover plate 17. The distance sleeve 16 acts between the rear cover plate 17 and the mounting plate 11. The rear cover plate 17, the mounting plate 11, and the blades 18 form a fluid channel for the exhaust gas of the air compressor. In practical applications, the distance sleeve 16 and the rear cover plate 17 can also be omitted, and the fluid channel for the exhaust gas of the air compressor can be directly formed by the corresponding parts of the air compressor, the mounting plate 11, and the blades 18.

[0055] It should be noted that the various embodiments of the present application can be arbitrarily combined into a new embodiment if the solutions do not conflict and the technical solutions can coexist.

[0056] The present application is described in detail above. Specific examples are used in this article to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the present application and its core ideas. It should be pointed out that for ordinary technicians in this technical field, without departing from the principles of the present application, several improvements and modifications can be made to the present application, and these improvements and modifications also fall within the scope of protection of the claims of the present application.

Claims

1. A variable cross-section nozzle ring for a hydrogen fuel cell air compressor, characterized in that: It comprises a driving disk (12) and a mounting disk (11) which are coaxially arranged, wherein the driving disk (12) is rotatably connected to the mounting disk (11); The driving disk (12) comprises a coaxially arranged anti-stuck portion (122) and a connecting portion (121), and the anti-stuck portion (122) is connected to the inner side of the connecting portion (121); The distance between the radial surfaces facing each other of the connecting portion (121) and the mounting plate (11) is L1, and the distance between the radial surfaces facing each other of the anti-stuck portion (122) and the mounting plate (11) is L2, wherein L2>L1.

2. The variable cross-section nozzle ring for a hydrogen fuel cell air compressor according to claim 1, characterized in that: In the radial direction, the distance between the radial surfaces of the anti-stuck portion (122) and the mounting plate (11) facing each other gradually increases toward the central axis direction; Wherein, the radial surface of the anti-stuck portion (122) facing the mounting plate (11) is a wedge-shaped structure.

3. The variable cross-section nozzle ring for a hydrogen fuel cell air compressor according to claim 1, characterized in that: The anti-stuck portion (122) and an axial surface close to the central axis are the first end surface (1221), and the radial surface of the anti-stuck portion (122) facing the mounting plate (11) is the second end surface (1222); There is an included angle θ between the first end surface (1221) and the second end surface (1222), 90°<θ<180°.

4. The variable cross-section nozzle ring for a hydrogen fuel cell air compressor according to claim 3, characterized in that: The mounting plate (11) comprises a shaft shoulder portion (111), and the shaft shoulder portion (111) is used to axially limit the driving plate (12); The driving disc (12) is provided with a mounting hole, and the diameter of the mounting hole is larger than the outer diameter of the shaft shoulder portion (111).

5. The variable cross-section nozzle ring for a hydrogen fuel cell air compressor according to claim 4, characterized in that: The axial length of the first end surface (1221) is smaller than the axial width of the shaft shoulder portion (111); There is a distance between the first end surface (1221) and the end portion on the same side of the shaft shoulder portion (111).

6. The variable cross-section nozzle ring for a hydrogen fuel cell air compressor according to claim 1, characterized in that: The anti-stuck portion (122) is provided with a buffer groove (123), the buffer groove (123) is open on an axial surface of the anti-stuck portion (122) close to the central axis, and the buffer groove (123) is recessed in a radial direction away from the central axis.

7. The variable cross-section nozzle ring for a hydrogen fuel cell air compressor according to claim 6, characterized in that: The radial depth of the buffer groove (123) is smaller than the radial length of the anti-stuck portion (122); The axial width of the buffer groove (123) is smaller than the axial length of the axial surface of the anti-stuck portion (122) close to the central axis.

8. The variable cross-section nozzle ring for a hydrogen fuel cell air compressor according to claim 7, characterized in that: The connection surface between the side wall and the bottom wall inside the buffer groove (123) is a smooth arc surface; The buffer groove (123) is located in the middle of the shaft shoulder (111).

9. The variable cross-section nozzle ring for a hydrogen fuel cell air compressor according to claim 1, characterized in that: The axial length of the connecting portion (121) is greater than the axial length of the anti-stuck portion (122); The axial length of the connecting portion (121) is greater than the axial length of the shaft shoulder portion (111).

10. The variable cross-section nozzle ring for a hydrogen fuel cell air compressor according to claim 1, characterized in that: The mounting plate (11) is provided with a travel limit pin (15), the driving plate (12) is provided with a travel groove (124), the travel limit pin (15) is located in the travel groove (124), the circumferential length of the travel groove (124) is greater than the diameter of the travel limit pin (15), and the travel limit pin (15) is used to limit the rotational travel of the driving plate (12).

Images