CN219711865U - Blade type blade structure for reducing NVH noise of hydrogen circulating pump - Google Patents

Abstract

The utility model relates to a blade-shaped blade structure for reducing NVH noise of a hydrogen circulation pump. The inner and outer rings of the blades are concentrically arranged, and multiple blades are connected horizontally and tangentially to the inner ring of the blades at spiral intervals around the center of the inner ring of the blades. Between the inner and outer rings of the blade, the blade has a horizontally oriented V-shaped structure. The inside of the V-shaped blade is the upper and lower pressure surfaces. The upper and lower pressure surfaces transition in an arc at the V-shaped joint. The outside of the V-shaped blade is the upper and lower pressure surfaces. On the lower suction surface, the upper and lower suction surfaces transition into arcs at the V-shaped joint. The upper and lower ends of the upper and lower suction surfaces are arc chamfers. The angle between the upper suction surface and the upper pressure surface gradually increases from top to bottom. , the angle between the lower suction surface and the lower pressure surface gradually increases from bottom to top. Its structure is simple, it can effectively take into account flow, efficiency, overall volume and weight, and reduce BPF noise.

Description

A blade-shaped blade structure for reducing NVH noise in a hydrogen circulation pump

Technical field

The utility model relates to a hydrogen circulation pump, specifically a blade-type blade structure for reducing NVH noise of the hydrogen circulation pump.

Background technique

As a key device in the fuel transportation system, the hydrogen circulation pump has a relatively high speed. The structure contains a motor and a rotor system. Its main noise sources are synchronous noise, motor noise, impeller aerodynamic noise, etc.; the main aerodynamic noise is the blade Through frequency noise, like the turbocharger used in traditional internal combustion engines, the hydrogen circulation pump also has BPF noise; with the development of fuel cell vehicles, the output power of the fuel cell reactor has been further improved, and higher indicators have increased the hydrogen pump The flow rate and rotational speed increase the average stress of the blades, causing the impeller BPF noise to increase. Especially in the low-speed region of the hydrogen circulation pump, the impeller BPF noise is easily distinguished from the operating background noise, and the human ear is more sensitive to this frequency range.

The best solution to BPF noise in the existing technology is to increase the number of blades, but increasing the number of blades will reduce the maximum flow rate and maximum efficiency of the hydrogen circulation pump, which is contrary to the increasingly demanding performance indicators; other solutions are in Adding a Helmholtz muffler to the outlet of the hydrogen circulation pump to filter noise in the fixed frequency range will change the outlet boundary of the hydrogen circulation pump, increase costs, and increase overall quality.

Contents of the invention

The utility model provides a blade-shaped blade structure for a hydrogen circulation pump that has a simple structure and can effectively take into account flow, efficiency, overall volume, and weight, and reduce BPF noise, and is used to reduce NVH noise.

The technical solution adopted by this utility model is: a blade-type blade structure for reducing NVH noise in a hydrogen circulation pump, which is characterized by: including an inner blade ring, an outer blade ring and a plurality of blades, and the inner and outer rings of the blades are concentrically arranged , multiple blades are oriented horizontally in the tangential direction of the inner ring of the blade, and are evenly connected at spiral intervals around the center of the inner ring of the blade, between the inner and outer rings of the blade. The blade is a horizontally oriented V-shaped structure, and the inner side of the V-shaped blade is the upper and lower pressure surfaces. , the upper and lower pressure surfaces transition in arcs at the V-shaped joint. The outside of the V-shaped blade is the upper and lower suction surfaces. The upper and lower suction surfaces transition in arcs at the V-shaped joint. The upper and lower ends of the upper and lower suction surfaces are For arc chamfering, the angle between the upper suction surface and the upper pressure surface gradually increases from top to bottom, and the angle between the lower suction surface and the lower pressure surface gradually increases from bottom to top.

The outer side of the arc chamfer is tangent to the horizontal line and the outer end point of the arc chamfer is on the outermost edge of the corresponding pressure surface.

The V-shaped blades are symmetrical up and down with respect to the central V-shaped joint.

The angle between the upper pressure surface and the vertical line is greater than the angle between the lower pressure surface and the vertical line.

The blade-shaped blade structure of this utility model can improve the gas flow, increase the flow rate and efficiency of the hydrogen circulation pump, and reduce the average stress of a single blade under an appropriate number of blades to reduce BPF noise.

Description of drawings

Figure 1 is a schematic structural diagram of the utility model;

Figure 2 is an expanded view of the blade section corresponding to Figure 1.

In the picture: blade inner ring 1, blade outer ring 2, blade 3, upper pressure surface 4, lower pressure surface 5, upper suction surface 6, lower suction surface 7, arc chamfer 8.

Detailed ways

The utility model will be further described below in conjunction with the accompanying drawings.

Figures 1 and 2 show: a blade-shaped blade structure of a hydrogen circulation pump used to reduce NVH noise, including an inner blade ring 1, an outer blade ring 2 and multiple blades 3. The inner and outer blade rings 1 and 2 are concentrically arranged , a plurality of blades 3 are horizontally oriented in the tangential direction of the inner ring of the blade and are evenly distributed at spiral intervals around the center of the inner ring of the blade and connected between the inner and outer rings of the blade. The blade is a horizontally oriented V-shaped structure, and the upper and lower inner sides of the V-shaped blade are respectively upper and lower. The lower pressure surfaces 4 and 5, the upper and lower pressure surfaces transition in an arc at the V-shaped joint. The upper and lower sides of the V-shaped blade are respectively upper and lower suction surfaces 6 and 7. The upper and lower suction surfaces transition in an arc at the V-shaped joint. , the angle between the upper suction surface and the upper pressure surface gradually increases from top to bottom, and the angle between the lower suction surface and the lower pressure surface gradually increases from bottom to top; the upper and lower ends of the upper and lower suction surfaces are arc chamfers. 8. The outer side of the arc chamfer is tangent to the horizontal line and the outer endpoint of the arc chamfer is on the outermost edge of the corresponding pressure surface.

The airflow flows in from the upper suction surface of the blade, is pressed down to the lower part by the upper pressure surface, and then is pressed out through the lower pressure surface. At the same time, it is sucked out by the lower suction surface, which effectively ensures the stable, efficient, and high-flow delivery of the airflow, and passes through the circle at the V-shaped joint. Arc transition, the thickness of the blade is thick in the middle and thin at the top and bottom. The blade has a blade shape. When the blade blade rotates at high speed, it can stably fluctuate the airflow entering the impeller, avoid gas separation at the leading edge and cause stall, which can effectively improve aerodynamic flow and efficiency. .

In this embodiment, the V-shaped blade is symmetrical up and down with respect to the central V-shaped joint.

The blades can also be arranged at an angle so that the angle between the upper pressure surface and the vertical line is greater than the angle between the lower pressure surface and the vertical line, making it easier to pressurize the gas downward.

Claims (4)

1. A hydrogen circulating pump is used for reducing edge type blade structure of NVH noise, its characterized in that: including blade inner circle, blade outer lane and a plurality of blade, the concentric setting of blade is in, outer lane, a plurality of blades are the level towards blade inner circle tangential direction around blade inner circle central spiral interval equipartition connect in between the blade, the outer lane, the blade is the V type structure of level orientation, the inboard upper and lower pressure face that is of blade V type, upper and lower pressure face is at V type junction circular arc transition, the blade V type outside is upper and lower suction face, upper and lower suction face is at V type junction circular arc transition, upper and lower suction face's upper and lower end is circular arc chamfer, the contained angle of upper suction face and upper pressure face is from top to bottom increase gradually, the contained angle of lower suction face and lower pressure face is from bottom to top gradually.

2. The blade structure of the hydrogen circulation pump for reducing NVH noise according to claim 1, characterized in that: the outer side of the circular arc chamfer is tangent with the horizontal line, and the outer side endpoint of the circular arc chamfer is arranged on the outermost edge of the corresponding pressure surface.

3. The blade structure of the hydrogen circulation pump for reducing NVH noise according to claim 1, characterized in that: the blade V-shaped joint is vertically symmetrical at the central V-shaped joint.

4. The blade structure of the hydrogen circulation pump for reducing NVH noise according to claim 1, characterized in that: the included angle between the upper pressure surface and the vertical line is larger than the included angle between the lower pressure surface and the vertical line.