A VENTILATION APPARATUS WITH COUNTER-ROTATING IMPELLERS DRIVEN BY LONG SHAFT

• US 20180080451A1
• Filed: 11/19/2015
• Published: 03/22/2018
• Est. Priority Date: 06/12/2015
• Status: Active Grant

• Current Assignee: Taiyuan University Of Technology (Province of Shanxi)
• Original Assignee: Taiyuan University Of Technology (Province of Shanxi)
• Inventors: KOU, ZIMING, WU, JUAN, GAO, GUIJUN, DA, SHANRONG, ZHANG, JING, KOU, YANFEI, LI, TING, LI, SHENG, WEI, JIN
• Granted Patent: US 10,598,182 B2
• Time in Patent Office: Days
• CPC Class Codes: E21F 1/00 Ventilation of mines or tunnels; Distribution of ventilating currents ventilating rooms or spaces in general F24F
• CPC Class Codes: F04D 19/007 multistage fans
• CPC Class Codes: F04D 19/024 with contrarotating parts
• CPC Class Codes: F04D 25/02 Units comprising pumps and their driving means
• CPC Class Codes: F04D 25/08 the working fluid being air, e.g. for ventilation
• CPC Class Codes: F04D 29/053 Shafts
• CPC Class Codes: F04D 29/545 Ducts
• CPC Class Codes: F16H 1/222 with non-parallel axes
• CPC Class Codes: F16H 25/186 with reciprocation along the axis of oscillation

Abstract

There is provided a ventilation apparatus with counter-rotating impellers driven by long shaft, wherein an electric motor and a gearbox are placed outside the air duct by using a long shaft with an internally disposed slim shaft extending therefrom, and are connected with the first stage impeller and second stage impeller inside the air duct by using the long shaft and slim shaft extending therefrom. In this ventilation apparatus with counter-rotating impellers, the components of the ventilation apparatus are placed inside and outside the air duct respectively by using the transmission shaft, which is convenient for maintenance and operation. By remotely arranging the impellers at an axial distance, the hub of the impellers will no longer be affected by an internally disposed electric motor, so as to reduce the ventilation resistance to ventilation. The impellers can be switched between the single impeller rotation and the counter rotation of two impellers.

Claims

1-5. -5. (canceled)

6. A ventilation apparatus with counter-rotating impellers driven by long shaft including a motor, a gearbox, a transmission shaft, a first-stage impeller and a second-stage impeller, characterized in that,

the motor (1) and the transmission gear box (3) are disposed at a designed position outside an air duct (4) by using the transmission shaft extending therefrom;

in the gearbox (3) is provided a cross shaft (10) which is mounted with a driven bevel gear (11) in the longitudinal direction and is provided with the slim shaft (14) passing therethrough in the transverse direction, and is further provided with a compression spring (8) and a driving bevel gear (12) adjacent the slim shaft (14) in the longitudinal direction;

a gear shaft of the gearbox (3) is connected with the long shaft (5) through the fan-blade flange;

the body of the gearbox (3) is connected to a lateral flange which is sequentially provided with an engaging surface for gear sector (21), a movable end-cam (20) and a stationary end-cam (19) at one side, and is provided with an operating handle (22) at the other side;

the transmission shaft is composed of a long shaft (5) and a slim shaft (14) disposed therein, and the long shaft (5) and the slim shaft (14) are connected with the gearbox (3) at one end, and are connected with the second stage impeller (6) and the first stage impeller (7) respectively at the other end for counter rotation; and

the first stage impeller (7) and the second stage impeller (6) are placed at a designed position inside the air duct (4) by using the transmission shaft extending therefrom, and no motor or any other component affecting the disturbance of air flow is disposed between the two impellers.

7. The ventilation apparatus with counter-rotating impellers driven by long shaft according to claim 6, characterized in that, the engagement and disengagement between the movable end-cam (20) and the stationary end-cam (19) are controlled by means of the operation handles (22) outside the body of the gearbox (3);

and

when the movable end-cam (20) engages with the stationary end-cam (19), the transmission chain is disconnected, and the slim shaft rotates the first stage impeller, to perform the operation and ventilation of a single impeller;

when the movable end-cam (20) disengages with the stationary end-cam (19), the transmission chain is connected, and the gear box achieves the reversing of rotation, to perform the counter rotation of the two impellers.

8. The ventilation apparatus with counter-rotating impellers driven by long shaft according to claim 6, characterized in that, the first stage impeller (7) and the second stage impeller (6) have a diameter of 800 mm, the motor (1) has a rated power of 55 kW×

2 and a speed of revolution of 2970 rpm, and the gearbox (3) has a transmission ratio of 1;

1.

9. The ventilation apparatus with counter-rotating impellers driven by long shaft according to claim 7, characterized in that, the ventilation apparatus with counter-rotating impellers is used in the ventilation environment in which the ventilation volume is 540 to 900 m³/min, the ventilation pressure is 8600 to 1500 Pa, the air density is 1.20 kg/m³.

10. The ventilation apparatus with counter-rotating impellers driven by long shaft according to the claim 8, characterized in that, under the standard operating condition of the ventilation apparatus with counter-rotating impellers, the ventilation volume is 790 m³/min, and the ventilation pressure is 6000 Pa.