CN201723463U - High-total-pressure large-flow-rate inclined-wheel-disc forwards-bending-impeller centrifugal ventilator - Google Patents

Abstract

The utility model discloses a centrifugal ventilator with high total pressure and large flow rate with inclined wheel disc and forward curved impeller, which belongs to the technical field of fans. Its characteristics are composed of motor, bracket, rear side plate, impeller, exhaust volute, front side plate, conical arc-shaped inlet diversion pipe, protective net, and inlet diversion cover. The roulette means that the roulette and the motor shaft are not vertical in the front view, and the hub is equipped with an inlet shroud, and the impeller adopts 36 arc-shaped long blades. The exhaust volute adopts a logarithmic spiral form, with large holes on the front side plate and small holes on the rear side plate. This patent not only satisfies the operation requirements of high total pressure and large flow rate of the cooling fan, but also improves the air flow inside the fan through the special slanted disc design, which reduces the flow loss and noise. In comparison, due to the small number of impeller blades, the processing and manufacturing are simpler.

Description

A kind of centrifugal fan with high total pressure and large flow slanted disc forward curved impeller

technical field

This patent belongs to the technical field of fans, and relates to a cooling and ventilation of locomotive traction motors and related equipment, in particular to a centrifugal fan with high total pressure and large flow with inclined wheel discs and forward curved impellers. the

Background technique

Centrifugal fans are widely used in ventilation, dust removal and cooling of vehicles, ships, factories, mines, tunnels, cooling towers and buildings. It is mainly composed of the impeller and the casing. The impeller is the main part of the centrifugal fan. Its geometric shape, size, number of blades and manufacturing precision have a great influence on the performance. Generally, centrifugal fans have the characteristics of high total pressure coefficient and large flow coefficient. the

However, the space inside the locomotive is quite limited, and the requirements for the centrifugal fan are higher. While providing high total pressure and large flow, it must meet conditions such as low noise, compact structure, and small footprint. Moreover, in actual use, the operating efficiency of the centrifugal fan at the large flow point is low, the power consumption is large, and the power is too high. big impact. The main reason is: the centrifugal cooling ventilator for locomotive in the prior art, its impeller disc all adopts straight disc structure, and so-called straight disc is exactly that impeller disc and motor shaft are vertical in front view), although structure is simple, But the aerodynamic performance is poor. In the case of high total pressure and large flow rate, the impeller of the straight disc needs a lot of blades, about 60-70 pieces, which increases the difficulty of manufacturing the impeller to a certain extent and increases the cost of the fan. Moreover, since this type of fan is generally a single-stage cantilever type, the hub of the impeller inlet is mostly simple in structure, and no flow guide device is installed, resulting in disordered air flow at the inlet of the fan, resulting in impact, which not only reduces the efficiency but also produces a huge blow. noise. Therefore, it is necessary to design and improve the centrifugal cooling fan to further improve its performance and reduce its energy consumption. the

Utility model content

The technical problem to be solved in this patent is to provide a centrifugal fan with a high total pressure and large flow slanted disc impeller, which can overcome the low operating efficiency and energy efficiency of the traditional fan at the large flow working point under the condition of providing high total pressure and large flow. To overcome the defect of large power consumption, further improve the aerodynamic efficiency, device efficiency and use efficiency of the fan, so as to reduce the proportion of the power consumed by it in the auxiliary power of the locomotive, and improve the overall operating efficiency of the locomotive. the

The technical solution of this patent is:

A high total pressure and large flow slanted disc forward-curved impeller centrifugal fan, including a motor, an impeller, an exhaust volute, a conical arc-shaped inlet guide pipe, and an inlet guide cover; it is characterized in that the rear of the exhaust volute The side plate and the motor are fixed on the bracket, and the extension shaft of the motor extends into the exhaust volute through the small hole on the exhaust volute; the impeller enters the exhaust volute through the large hole on the front side plate of the exhaust volute The hub of the impeller is set on the extension shaft of the motor extending into the exhaust volute, and the front end of the extension shaft of the motor is fixed on the hub of the impeller; the inlet shroud is fixed on the hub of the impeller, and through the cone The connection between the curved inlet guide pipe and the front side plate of the exhaust volute fixes the inlet guide pipe on the exhaust volute;

The impeller adopts a slanted disc structure, the disc and the motor shaft are not perpendicular to the central axis, a conical inlet shroud is installed at the hub of the impeller, and the exhaust volute adopts a logarithmic helix. the

The axial section of the conical inlet shroud is a circular arc line, so it is more in line with the flow characteristics and meets the requirements of high total pressure and large flow. The impeller in this patent can adopt 36 arc-shaped long blades. Compared with the traditional forward-curved impeller of the same type that mostly adopts many short blades, the number is obviously reduced by about half, and the blade inlet edge has a large extension to the impeller inlet. the

The inner wall of the exhaust volute is in the form of a logarithmic helix, and there is a large hole on the front side plate for the impeller to be installed, and a small hole on the rear side plate that can pass through the motor to extend the shaft. the

The design of this patent is reasonable, and its effects and benefits mainly include:

(1) The impeller adopts a slanted disc, which takes into account the requirements of large flow and high total pressure, and makes the streamline form in the impeller more in line with the flow characteristics, reducing the flow loss;

(2) The inlet shroud is installed on the hub, which improves the air flow at the inlet of the impeller and reduces the noise of the fan due to the impact of the inlet;

(3) The increase of blade length is equivalent to increasing the effective work area of a single blade, so that the number of blades is reduced, and the density of the cascade is reduced, thereby reducing the processing difficulty of the impeller;

(4) The logarithmic helical form of the exhaust volute is beneficial to the collection of air and reduces the flow loss. the

Description of drawings

Fig. 1 is a schematic diagram of the front view structure of this patent. the

Fig. 2 is a schematic diagram of the structure on the right side of this patent. the

In the figure: 1 motor; 2 bracket; 3 rear side plate; 4 impeller; 5 exhaust volute; 6 front side plate; the

Detailed ways

The specific implementation manner of this patent is described in detail below in conjunction with technical scheme and accompanying drawing. the

As shown in Fig. 1 and Fig. 2, a high total pressure and large flow slanted disc forward-curved impeller centrifugal fan of this patent consists of a motor 1, a bracket 2, a rear side plate 3, an impeller 4, an exhaust volute 5, a front The side plate 6, the conical arc-shaped inlet guide pipe 7, the protective net 8 and the inlet guide cover 9 are formed. Wherein the impeller 4 adopts a slanted wheel disc, and a conical inlet shroud 9 is installed at the wheel hub, and compared with the traditional forward curved impeller of the same type that mostly adopts many short blades, the impeller 4 in this patent adopts 36 arc-shaped long blades. The number of blades is obviously reduced by about half, and the inlet side of the blades has a relatively large extension to the inlet of the impeller 4. The exhaust volute 5 is in the form of a logarithmic spiral, and the front side plate 6 has a large hole that can be loaded into the impeller 4. Hole, rear side plate 3 has the aperture that can stretch into motor 1 to stretch out the shaft. the

During installation, the rear side plate of the exhaust volute 5 and the motor 1 are fixed on the bracket 2 by bolts, and the extension shaft of the motor 1 extends into the exhaust volute 4 through the small hole of the rear side plate 3 of the exhaust volute 5 , the impeller 4 is pushed into the exhaust volute 5 through the large hole in the front side plate 6 of the exhaust volute 5, the hub of the impeller 4 is sleeved on the extended shaft of the motor 1 extending into the exhaust volute 5, and passed through the nut Fix the hub of impeller 4 by screwing it on the thread at the front end of the extension shaft of motor 1, so that the relative positions of motor 1, impeller 4 and exhaust volute 5 are fixed; screwing on the hub of impeller 4 has been processed The inlet shroud 9 is fixedly installed on the hub of the impeller 4 in the screw hole, and then the inlet shroud 7 is fixed by the bolt connection between the inlet shroud 7 and the front side plate 6 of the exhaust volute 5 On the exhaust volute 5; finally, the protective net 8 is installed on the inlet guide pipe 7 with bolts to prevent debris from being sucked into the fan to cause damage to the fan when the fan is running. the

Claims (2)

1. a high full-voltage large-flow centrifugal blower with slant-wheel disk front-bent impeller comprises motor (1), impeller (4), exhaust volute (5), awl arc import honeycomb duct (7), import air guide sleeve (9); It is characterized in that the back side panel (3) of exhaust volute (5) and motor (1) are fixed on the support (2), the projecting shaft of motor (1) stretches in the exhaust volute (4) by the aperture on the exhaust volute (5); Impeller (4) enters into exhaust volute (5) by the macropore on the front side plate (6) of exhaust volute (5); The wheel hub of impeller (4) is enclosed within on the projecting shaft of the motor (1) that stretches in the exhaust volute (5), and motor (1) projecting shaft is fixed on the wheel hub of impeller (4) foremost; Import air guide sleeve (9) is fixedly mounted on the wheel hub of impeller (4), by the connection between the front side plate (6) of import honeycomb duct (7) and exhaust volute (5) import honeycomb duct (7) is fixed on the exhaust volute (5);

Impeller (4) adopts oblique wheeling disk structure, and wheel disc and motor shaft are in the central shaft out of plumb, and impeller (4) wheel hub is adorned cone-shaped inlet air guide sleeve (9); Exhaust volute (5) adopts the log spiral type.

2. a kind of high full-voltage large-flow centrifugal blower with slant-wheel disk front-bent impeller according to claim 1 is characterized in that, impeller (4) adopts 36 circular arc linear leafs.

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