Fuel cell cooling system fan

Abstract

This invention relates to the field of fluid machinery technology and discloses a fan for a fuel cell cooling system, comprising a casing and impellers arranged in sections within the casing. Each impeller includes a left-handed impeller and multiple adjacent right-handed impellers. Each impeller consists of a rear disc, blades, a front disc, and a core. The blades are installed at an angle of 30–40°. Sound-absorbing material is installed on the inner wall of the casing. Through the combination of left-handed and right-handed impellers, and by rationally selecting the number of blades and their installation angles, and further by incorporating serrated blades at the trailing edges and flow-guiding devices at the corners of the casing cavity, the internal flow field of the fan is kept relatively dry, resulting in a fan pressure and efficiency exceeding 80%, minimal airflow noise, and significant energy savings.

Description

Technical Field

[0001] The present invention relates to the technical field of fluid machinery, and in particular to a fan of a fuel cell cooling system. Background Art

[0002] The fan of the fuel cell cooling system is used for electromagnetic cooling of the fuel. The heat generated by the fuel cell enters the radiator through water circulation, and the cooling system fan exhausts the hot air by exhausting. This type of fan requires high efficiency, light weight, low noise, low vibration, and compact space.

[0003] The existing cooling system fan (hereinafter referred to as the fan) has problems such as bulky structure, low efficiency, high noise and vibration, as follows:

[0004] (1) The number of impellers of the same type of fan is limited to less than 3, the weight is generally above 260kg, the vibration of the fan in the X, Y, and Z directions is greater than 4.5mm / s, and the fan noise is greater than 106dB.

[0005] (2) The fan sound-absorbing material is installed inside the casing and cannot be replaced during its service life. After long-term use, the sound-absorbing effect of the noise material will become worse and worse due to the effects of rain and coal ash, resulting in a poor working environment for workers.

[0006] (3) The fan efficiency is usually between 55% and 65%, which is relatively low and consumes high energy during long-term operation. Summary of the invention

[0007] The technical problem solved by the present invention is to overcome the defects of the prior art and provide a fuel cell cooling system fan with high total pressure efficiency and significantly reduced airflow noise.

[0008] The purpose of the present invention is achieved through the following technical solutions:

[0009] A fuel cell cooling system fan comprises a casing and impellers arranged in different areas in the casing, wherein the impellers comprise a left-handed impeller and a plurality of right-handed impellers installed adjacent to each other, the impellers consist of a rear wheel disc, blades, a front wheel disc and a wheel core, and the installation angle of the blades is 30 to 40 degrees; and the inner wall of the casing is installed with sound absorbing material.

[0010] Furthermore, there are three right-handed impellers.

[0011] Furthermore, the trailing edge of the blade has 5×5 serrations.

[0012] Furthermore, the number of blades is nine.

[0013] Furthermore, the gap between the rear wheel disc and the inner wall of the casing is 15 to 25 mm.

[0014] Furthermore, the gap between the rear wheel disc and the inner wall of the casing is 20 mm.

[0015] Furthermore, a flow guide device is installed at the corner of the inner cavity of the casing, and a sound absorbing material is provided between the flow guide device and the inner wall of the casing.

[0016] Furthermore, the sound absorbing material is installed on the inner wall of the casing through a porous mesh plate, and the porous mesh plate is detachably connected to the casing.

[0017] Furthermore, the frequency of the sound absorbing material is 500 Hz and the sound absorption coefficient is 1.12.

[0018] Furthermore, a collector is provided on the front wheel disc of the impeller.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] 1) The left-handed and right-handed impellers are designed together, and the number of blades and the blade installation angle are reasonably selected. In addition, sawtooth blades are set at the trailing edge of the blades, and guide devices are set at the corners of the inner cavity of the casing, which ensures that there are fewer eddy currents in the flow field inside the fan, and the fan pressure and efficiency reach more than 80%, the airflow noise reaches the lowest level, and the energy-saving effect is obvious;

[0021] 2) The replaceable and washable design of the sound-absorbing material can effectively ensure the real-time noise reduction effect;

[0022] 3) The overall structure of the casing has been optimized, and the weight has been reduced by 1 / 2 compared to traditional casings while ensuring the strength of the casing. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 A side view of a fan of a fuel cell cooling system according to Example 1;

[0024] Figure 2 A top view of the fan of the fuel cell cooling system described in Example 1;

[0025] Figure 3 It is a top view of the left-handed impeller;

[0026] Figure 4 is a side sectional view of a left-handed impeller;

[0027] Figure 5 It is a top view of the right-handed impeller;

[0028] Figure 6 It is a side sectional view of a right-handed impeller. DETAILED DESCRIPTION

[0029] The present invention is further described below in conjunction with specific implementation methods, wherein the accompanying drawings are only used for exemplary descriptions and represent only schematic diagrams rather than actual drawings, and should not be understood as limitations on this patent; in order to better illustrate the embodiments of the present invention, some parts of the accompanying drawings may be omitted, enlarged or reduced, and do not represent the size of the actual product; for those skilled in the art, it is understandable that some well-known structures and their descriptions in the accompanying drawings may be omitted.

[0030] Example 1

[0031] like Figure 1 As shown, a fuel cell cooling system fan is provided, including a casing 1 and an impeller 2 arranged in different areas in the casing. The casing 1 is a box-shaped structure formed by riveting plates including a left side plate 11, a right side plate 12, a top plate 13 and a front sealing plate 14. It is a non-traditional volute structure. The casing 1 is divided into four cavities by three partitions 15 in the middle of the casing. The space dimensions of the four cavities are different. The impeller 2 includes a left-handed impeller 21 and three adjacently installed right-handed impellers 22. The four impellers are installed in four cavities in parallel. Each impeller is driven by a motor 3. The motor is a three-phase asynchronous motor. The protection level of the motor is IP56. The motor adopts a conical bearing and a maintenance-free bearing. The end cover of the motor is connected to the casing top plate by bolts. The left side plate 11, the right side plate 12 and the top plate 13 are made of 3mm thick aluminum plates. 4×20 reinforcing concave ribs are also pressed on the surface of the aluminum plate. The weight of the casing 1 is reduced by 1 / 2 compared with the traditional casing.

[0032] The impeller is welded together by a rear wheel disc 23, blades 24, a front wheel disc 25 and a wheel core 26. The rear wheel disc 23 is arranged close to the motor 3, and the installation angle of the blades 24 is 30-40 degrees. The inner wall of the casing 1 is installed with sound absorbing material.

[0033] Impeller 2 is a strongly backward arc blade impeller structure with a small blade outlet angle. The trailing edge of blade 24 has 5×5 serrations 241, which are sharp groove type. The 5×5 specification means that the height of the sharp groove is 5mm and the depth is 5mm. The wheel core shaft hole 261 is designed as a 1:20 tapered hole to facilitate the disassembly and assembly of the impeller during fan maintenance. The number of blades on each impeller is 9.

[0034] The gap between the rear wheel disc 23 and the inner wall of the housing 1 is 15-25 mm, and the optimal gap is 20 mm.

[0035] A flow guide device is also installed at the corners of the inner cavity of the casing (i.e., the left and right corners), and the flow guide device is a flow guide plate 4. A sound absorbing material is provided between the flow guide device and the inner wall of the casing. Specifically, the sound absorbing material is installed on the inner wall of the casing through a porous mesh plate 5, and the porous mesh plate 5 is detachably connected to the casing 1 so that the sound absorbing material can be replaced and cleaned immediately to ensure the sound absorption effect.

[0036] The frequency of the sound-absorbing material used in the cooling system fan is 500HZ, and the sound absorption coefficient can reach 1.12.

[0037] In addition, a collector 6 is provided on the impeller front disk 25. The collector is a trumpet-shaped air inlet, which is made of a plate made of 3A21 material by spinning and then welding. The collector 6 is bolted to the front sealing plate 14 of the casing 1.

[0038] The technical effects that the fan of this embodiment can achieve compared with the prior art are shown in the following table:

[0039] This embodiment Comparative Example Number of impellers 4 3 Blade rotation 1 left-hand rotation, 3 right-hand rotations Same rotation direction Blade type Strong backward serrated blades Arc blade chassis No volute box No volute box Full pressure efficiency 80% 60%~65% weight 210kg 260kg-300kg Vibration speed 2.8mm / s 4.5mm / s

[0040] This embodiment optimizes the size and space of the inlet collector, impeller and casing, and makes reasonable selections on the number of impeller blades, the blade installation angle and the blade trailing edge serration size, thereby ensuring that there are fewer vortices in the internal flow field of the fan, the fan pressure and efficiency are maximized, and the airflow noise is minimized. Practice has proved that the full-pressure efficiency of the fan in this embodiment can reach more than 80%, which is more than 10% higher than that of traditional fans, and the energy-saving effect is obvious.

[0041] In addition, the fan of this embodiment adopts a combination of active noise reduction and passive noise reduction to jointly achieve a low-noise effect. Among them, the blade trailing edge serrations are designed in the active noise reduction, which can eliminate the vortex at the blade outlet and reduce the vortex noise; the sound-absorbing material in the passive noise reduction is designed to be detachable, and the sound-absorbing material with a frequency of 500Hz and a sound absorption coefficient of 1.12 is selected, which can eliminate the noise generated when the fan is working to the maximum extent. The porous mesh plate and the casing are connected by bolts, which is easy to disassemble and assemble, and is conducive to the replacement and cleaning of the sound-absorbing material, thereby improving the effect of noise reduction. Overall, the fan noise is reduced by more than 2dB compared with the traditional fan.

[0042] Obviously, the above embodiments are merely examples for clearly illustrating the technical solutions of the present invention, and are not intended to limit the implementation methods of the present invention. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all implementation methods here. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A fuel cell cooling system fan, characterized in that: It includes a casing and impellers arranged in different areas in the casing, the impellers include a left-handed impeller and a plurality of right-handed impellers installed adjacently, the impellers are composed of a rear wheel disc, blades, a front wheel disc and a wheel core, and the installation angle of the blades is 30 to 40 degrees; the inner wall of the casing is installed with sound absorbing material; There are three right-handed impellers, the trailing edges of the blades have 5×5 serrations, the number of blades is 9, the gap between the rear wheel disc and the inner wall of the casing is 15-25 mm, and the gap between the rear wheel disc and the inner wall of the casing is 20 mm; A flow guide device is installed at the corner of the inner cavity of the casing, and a sound-absorbing material is provided between the flow guide device and the inner wall of the casing. The sound-absorbing material is installed on the inner wall of the casing through a porous mesh plate, and the porous mesh plate is detachably connected to the casing. The frequency of the sound-absorbing material is 500HZ and the sound absorption coefficient is 1.

12.

2. The fuel cell cooling system fan according to claim 1, characterized in that: A collector is also provided on the front disc of the impeller.

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