Rotating shaft of air compressor of hydrogen fuel cell system

Abstract

The utility model relates to the technical field of hydrogen fuel cell systems, in particular to an air compressor rotating shaft of a hydrogen fuel cell system. Comprising a spindle body; the pressing wheel is mounted at one end of the rotating shaft main body in a sleeving manner; the turbine is installed at the end, away from the pressing wheel, of the rotating shaft body. The spacing ring is arranged on the rotating shaft main body in a sleeving manner and is coaxial with the pressing wheel, an axial limiting step is arranged on the rotating shaft main body, and the spacing ring is arranged between the pressing wheel and the axial limiting step in the axial direction; the spacing ring and the pressing wheel which are axially opposite, the axial limiting step and the spacing ring form two pairs of positioning objects, the rotating shaft further comprises circumferential positioning structures which are in concave-convex fit, and the circumferential positioning structures are arranged between each pair of positioning objects in the axial direction, so that the circumferential positioning structures can circumferentially lock the pressing wheel and the spacing ring on the rotating shaft main body. And the reliability of using the large-wheel-diameter pressing wheel by the rotating shaft system can be improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to hydrogen fuel cell system technical field, concretely relates to a hydrogen fuel cell system air compressor shaft. BACKGROUND

[0002] The air compressor is responsible for delivering clean air of specific pressure and flow for the electric pile in the fuel cell system, and provides necessary oxygen for the electric pile reaction, and is the most core component of the fuel cell system except the electric pile. The requirements of the hydrogen fuel cell industry for the air compressor are high efficiency, small volume, oil-free, large working flow and pressure range, small noise, vibration and impact resistance, fast dynamic response, etc. In the face of such harsh requirements, centrifugal air compressors have become the focus of research and development of various manufacturers. The centrifugal compressor is also called turbine compressor, and its working principle is that when the impeller rotates at high speed, the gas is thrown into the diffuser behind under the action of centrifugal force, and a vacuum zone is formed at the impeller. At this time, fresh gas from the outside enters the impeller. The impeller rotates continuously, and the gas is continuously sucked and thrown out, thereby maintaining the continuous flow of the gas. Because the requirements of the entire hydrogen fuel system on flow, pressure ratio and efficiency are getting higher and higher, therefore the air compressor can only increase the impeller and improve the speed to ensure the input demand of the system. Because the rotating shaft rotates at high speed, a large centrifugal force is generated, and the gas also generates a large force on the impeller, which brings more stringent challenges to the reliability of the overall structure of the air compressor shaft system.

[0003] In the traditional hydrogen fuel cell system air compressor, the compression wheel and the rotating shaft are only connected by interference fit and nut compression, the compression wheel is used for compressing air, and the compression wheel is easy to expand under the influence of temperature and centrifugal force in the high-speed working state. The compression wheel will rotate relative to the rotating shaft, which is specifically manifested as follows: the compression wheel is easy to rotate relative to the rotating shaft under the influence of aerodynamic force in the state of rapid acceleration; the compression wheel is easy to rotate relative to the rotating shaft under the influence of inertial force in the state of rapid deceleration.

[0004] And the traditional key connection circumferential positioning form needs to open a key groove in the inner hole of the compression wheel and on the rotating shaft. For the compression wheel with large wheel diameter installed on the thin rotating shaft, the installation space of the key is limited, and the stress concentration at the key groove position will cause large deformation of the compression wheel during work, which is very unfavorable to the strength and rigidity of the compression wheel and the rotating shaft. Utility model content

[0005] In order to overcome the defects of the prior art, the utility model provides a hydrogen fuel cell system air compressor shaft, which can improve the reliability of the rotating shaft system using large-diameter compression wheels.

[0006] In order to realize the above purpose, the utility model is realized by the following technical scheme:

[0007] A hydrogen fuel cell system air compressor shaft, comprising:

[0008] rotating shaft body;

[0009] turbine, the turbine is installed on one end of the rotating shaft body;

[0010] positioning object, the positioning object comprises: an axial limiting step arranged on the rotating shaft body and a pressing wheel, the pressing wheel is sleeved and installed on the end of the rotating shaft body away from the turbine, and the pressing wheel is arranged on the axial outer side of the axial limiting step;

[0011] the circumferential positioning structure is arranged between the axially adjacent pair of positioning objects, and the circumferential positioning structure is used for circumferentially locking the axially adjacent pair of positioning objects.

[0012] Further, the rotating shaft of the air compressor of the hydrogen fuel cell system in the application, the positioning object further comprises a spacing ring arranged between the pressing wheel and the axial limiting step in the axial direction, and the spacing ring is sleeved and installed on the rotating shaft body. That is, the axially opposite spacing ring and the pressing wheel, the axial limiting step and the spacing ring form two pairs of axially adjacent positioning objects. The spacing ring can be replaced flexibly to facilitate the axial positioning between the pressing wheel and the axial limiting step.

[0013] Preferably, the rotating shaft of the air compressor of the hydrogen fuel cell system in the application, the circumferential positioning structure comprises a positioning pin, the two axially opposite ends of the positioning pin are respectively embedded in a pair of positioning objects, and the circumferential positioning structure further comprises a pin hole arranged on the end face of the positioning object, and the pin hole is used for accommodating the positioning pin. As a preferred scheme of the application, the axially opposite spacing ring and the pressing wheel or the axial limiting step and the spacing ring form a pair of positioning objects.

[0014] Further, the rotating shaft of the air compressor of the hydrogen fuel cell system in the application, the number of positioning pins between each pair of positioning objects is 2.

[0015] Preferably, the rotating shaft of the air compressor of the hydrogen fuel cell system in the application, the circumferential positioning structure comprises a positioning convex part and a positioning concave part arranged on a pair of positioning objects respectively, and the positioning convex part is arranged in the axial direction on the positioning object.

[0016] Further, the rotating shaft of the air compressor of the hydrogen fuel cell system in the application, the number of positioning convex parts between each pair of positioning objects is 2.

[0017] Further, the rotating shaft of the air compressor of the hydrogen fuel cell system in the application, the material of the pressing wheel is aluminum alloy.

[0018] Further, the rotating shaft of the air compressor of the hydrogen fuel cell system in the application, the material of the positioning pin is stainless steel.

[0019] The above technical scheme can be seen, the utility model has the following beneficial effects:

[0020] The utility model provides a kind of hydrogen fuel cell system air compressor rotating shaft, its principle is: positioning object axial between being provided with circumferential positioning structure, realize the circumferential positioning between pressure wheel and rotating shaft main body, can prevent pressure wheel and rotate loose under the action of centrifugal force, aerodynamic force, inertial force.It can avoid the relative rotation between pressure wheel and main shaft and cause pressure wheel loose failure under the working condition of high-speed rotation.Make the reliability of rotating shaft system use larger wheel diameter pressure wheel greatly improve.And relative to key connection, it can improve the strength and rigidity of pressure wheel and rotating shaft. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 It is a structure schematic view of a kind of hydrogen fuel cell system air compressor rotating shaft in one embodiment of the application;

[0022] Figure 2 It is Figure 1 schematic view of spacer ring in the embodiment;

[0023] Figure 3 It is a structure schematic view of a kind of hydrogen fuel cell system air compressor rotating shaft in another embodiment of the application;

[0024] Figure 4 It is Figure 3 schematic view of spacer ring in the embodiment.

[0025] In the figure: 1-rotating shaft main body;11-axial limiting step;2-pressure wheel;3-turbine;4-spacer ring;5-circumferential positioning structure;51-positioning pin;52-pin hole;53-positioning convex part;54-positioning concave part. DETAILED DESCRIPTION

[0026] A kind of hydrogen fuel cell system air compressor rotating shaft, comprising:

[0027] rotating shaft main body 1;

[0028] turbine 3, turbine 3 is installed on one end of rotating shaft main body 1;

[0029] positioning object, positioning object includes: the axial limiting step 11 of being set on rotating shaft main body 1 and pressure wheel 2, pressure wheel 2 is installed in the end of rotating shaft main body 1 away from turbine 3, pressure wheel 2 is set on the axial outer side of axial limiting step 11;

[0030] concave-convex matched circumferential positioning structure 5, circumferential positioning structure 5 is arranged between a pair of axially adjacent positioning objects, and circumferential positioning structure 5 is used for circumferentially locking a pair of axially adjacent positioning objects.

[0031] Based on the above structure, the principle of an air compressor shaft for a hydrogen fuel cell system is as follows: a circumferential positioning structure 5 is set between the positioning components along the axis to achieve circumferential positioning between the pressure roller 2 and the shaft body 1, which can prevent the pressure roller 2 from rotating and loosening under the action of centrifugal force, aerodynamic force, and inertial force. Under high-speed rotation working conditions, it can avoid pressure roller loosening failure caused by relative rotation between the pressure roller and the shaft body. This greatly improves the reliability of the shaft system when using pressure rollers with larger diameters. Moreover, compared with key connections, it can improve the strength and rigidity of the pressure roller and the shaft body.

[0032] In such Figure 1 and Figure 3 In the two embodiments shown, the positioning object also includes a spacer ring 4 disposed between the pressure roller 2 and the axial limiting step 11, and the spacer ring 4 is sleeved and installed on the rotating shaft body 1. The spacer ring 4 can be flexibly replaced to facilitate axial positioning between the pressure roller 2 and the axial limiting step 11. Of course, in other embodiments (not shown), the spacer ring 4 may not be provided, and the circumferential positioning structure 5 directly connects the axial limiting step 11 and the pressure roller 2.

[0033] In one embodiment, the outer end of the pressure roller 2 is axially limited by a nut (not shown) provided on the rotating shaft body 1.

[0034] Combination Figure 1 and Figure 2 In the illustrated embodiment, the circumferential positioning structure 5 includes positioning pins 51, with both axial ends of the positioning pins 51 embedded in a pair of positioning objects. The circumferential positioning structure 5 also includes pin holes 52 disposed on the end faces of the positioning objects, the pin holes 52 being used to receive the positioning pins 51. That is, the axially opposite spacer ring 4 and pressure roller 2, as well as the axially limiting step 11 and spacer ring 4, form two pairs of adjacent positioning objects. Specifically, the number of positioning pins 51 between each pair of positioning objects is two. Furthermore, the material of the positioning pins 51 is stainless steel.

[0035] Combination Figure 3 and Figure 4 In another embodiment shown, the circumferential positioning structure 5 includes positioning protrusions 53 and positioning recesses 54 respectively disposed on a pair of positioning objects, with the positioning protrusions 53 extending axially on the positioning objects. The number of positioning protrusions 53 between each pair of positioning objects is 2.

[0036] The technical principles of this utility model have been described above with reference to specific embodiments. These descriptions are merely for explaining the principles of this utility model and should not be construed as limiting the scope of protection of this utility model in any way. Based on the explanation herein, those skilled in the art can conceive of other specific embodiments of this utility model without creative effort, and these embodiments will all fall within the scope of protection of this utility model.

Claims

1. A compressor shaft for a hydrogen fuel cell system, characterized in that: include: Rotating shaft body (1); Turbine (3), which is mounted at one end of the shaft body (1); The positioning object includes: an axial limiting step (11) and a pressure roller (2) disposed on the rotating shaft body (1). The pressure roller (2) is sleeved and installed on the end of the rotating shaft body (1) away from the turbine (3). The pressure roller (2) is disposed on the axial outside of the axial limiting step (11). A circumferential positioning structure (5) with a concave-convex fit is provided between a pair of axially adjacent positioning objects. The circumferential positioning structure (5) is used to circumferentially lock a pair of axially adjacent positioning objects.

2. The air compressor shaft of a hydrogen fuel cell system according to claim 1, characterized in that: The positioning object also includes a spacer ring (4) disposed between the pressure roller (2) and the axial limiting step (11) in the axial direction, and the spacer ring (4) is sleeved and installed on the rotating shaft body (1).

3. The air compressor shaft of a hydrogen fuel cell system according to claim 1 or 2, characterized in that: The circumferential positioning structure (5) includes a positioning pin (51), with the two ends of the positioning pin (51) respectively embedded in a pair of positioning objects. The circumferential positioning structure (5) also includes a pin hole (52) provided on the end face of the positioning object, which is used to receive the positioning pin (51).

4. The air compressor shaft of a hydrogen fuel cell system according to claim 3, characterized in that: The number of positioning pins (51) between a pair of positioning objects is 2.

5. The air compressor shaft of a hydrogen fuel cell system according to claim 1 or 2, characterized in that: The circumferential positioning structure (5) includes a positioning protrusion (53) and a positioning recess (54) respectively disposed on a pair of positioning objects, wherein the positioning protrusion (53) extends axially on the positioning object.

6. The air compressor shaft of a hydrogen fuel cell system according to claim 5, characterized in that: The number of positioning protrusions (53) between each pair of positioning objects is 2.

Images