CN201053400Y - Disturbed jet flow pneumatic fan - Google Patents

Abstract

The disturbed jet pneumatic fan of the utility model comprises an outer cylinder, an inner cylinder with the same axis as the outer cylinder, guide vanes for fixed connection between the outer cylinder and the inner cylinder, an air motor in the inner cylinder, and an air motor behind the air motor. There is an air distribution device at the front, a motor torque transmission device at the front, a fan impeller on the motor torque transmission device, an air inlet protective net at the front of the outer cylinder, and an air outlet protective net at the rear. Using the existing compressed air power source in the coal mine, no electric sparks will be generated, the air jet blown out has a certain rotation, and the main direction line can be divided into a conical surface, and turbulent air flow with different frequencies is generated in a cone-shaped area, which is greatly enhanced. The entrainment and mixing ability of the jet to the surrounding gas is improved, so that the gas accumulation within its effective range can be safely and quickly eliminated. It has compact structure, small size, convenient installation, safe use and wide practicability.

Description

Disturbed Jet Pneumatic Fan

technical field

The utility model relates to a disturbance jet pneumatic blower, which is especially suitable for controlling even-angle gas accumulation on coal mining working faces of coal mines, so as to ensure safe production in coal mines.

Background technique

Even-angle gas accumulation on the coal mining face is one of the basic reasons for gas explosions in coal mines. Even-angle gas accumulation on the U-shaped ventilation coal mining face is a worldwide problem that often occurs in coal mine production and is difficult to control. In the accumulated work, due to improper methods, especially improper equipment, vicious accidents of gas explosions caused by too many ignition sources occurred. Therefore, domestic and foreign countries have been researching equipment that can effectively control even-angle gas accumulation on coal mining face. At present, the treatment methods for even-angle gas accumulation on the coal mining face of coal mines can be summarized as rowing, guiding, blowing, guiding, pumping, etc. The specific representative methods are: ① set up wind barriers or partition walls at the corners of the working surface, and use non-sparking local fans for exhaust; ② use air flow ejectors and explosion-proof local fans for exhaust; ③ use automatic control systems to The gas in the goaf is forced to be pumped out at the corners to reduce the natural gushing amount; ④Use a radial jet fan to generate pulsating jets for blowing. In addition, there are methods such as changing the ventilation method and increasing the main ventilation volume.

①②③It is effective to control the accumulation of gas in even angles, but they all use the system of electric local fans and exhaust ducts, which is inconvenient for moving and relocation, and the gas in the exhaust ducts must be prevented from exceeding the limit during use. The ④ method uses a small hydraulic fan to be placed at the upper corner to blow air directly. It has the advantages of simple system, convenient relocation and large control range. Because it uses a safe hydraulic power source with no spark performance, it can be used to control the overrun Gas in the upper corner of the coal mine is very much needed. However, if this method is to be popularized and applied, the following problems need to be solved: ①The air motor for the hydraulic blower can use the compressed air or pressurized water in the coal mining face, and ensure its service life; ②It has stronger entrainment and disturbance capabilities The jet flow, the direction of rotation of the jet flow can not be limited to the plane; ③ the rotation of the impeller and the swing (or rotation) of the blower fan are completed with a motor to make the blower fan more miniaturized.

Utility model content

The purpose of this utility model is to provide a disturbance jet pneumatic fan with simple structure, convenient relocation, large control range, safety and reliability, long effective air flow distance and high diffusion intensity according to the shortcomings of the existing technology.

In order to achieve the above object, the disturbance jet pneumatic fan of the present utility model includes an outer cylinder, an inner cylinder with the same axis as the outer cylinder, guide vanes for fixed connection between the outer cylinder and the inner cylinder, and a Air motor, the air motor has an air distribution device at the rear, a motor torque transmission device at the front, a fan impeller on the motor torque transmission device, an air inlet protective net at the front of the outer cylinder, and an air outlet at the rear protective net.

The wind distribution device is composed of a wind distribution wheel bearing seat, a wind distribution wheel arranged on the wind distribution wheel bearing seat and a wind distribution wheel shaft arranged in the wind distribution wheel bearing seat; the wind distribution wheel is provided with several Fixed blades, these blades together with the outer cylinder form 1 to 2 air outlets, and there are several adjustable blades with petioles on the wind distribution wheel, and the adjustable blades are fastened to the hub of the wind distribution wheel by nuts; The motor torque transmission device described above is composed of an impeller bearing housing that fixes the air motor and an impeller shaft connected to the transmission shaft of the air motor; the air outlet pipeline of the air motor is provided with a muffler.

The fan is driven by a compressed air motor, using the existing compressed air power source in the coal mine, and will not generate sparks. The outlet air jet has a certain rotation, and the main direction line of the blown airflow can be divided into a conical surface. In a conical area The turbulent wind flow with different frequencies is generated inside, which greatly enhances the jet's ability to entrain and mix the surrounding gas, so that it can safely and quickly eliminate the gas accumulation within its effective range. It has a wind jet with stronger entrainment and disturbance capabilities, and the rotation direction of the wind jet is not limited to the plane; the rotation of the impeller and the rotation of the air distribution runner are completed by a motor, which makes the fan more miniaturized, and its structure is compact and easy to install. It is safe to use and has wide practicability.

Description of drawings

Accompanying drawing is the structural diagram of the utility model.

In the figure: inlet protection net 1, fan impeller 2, outer cylinder 3, inner cylinder 4, air motor 5, air inlet and outlet pipe 6, wind distribution wheel 7, adjustable blade 8, outlet protection net 9, wind distribution wheel bearing seat 10, Wind distribution wheel shaft 11, guide vane 12, impeller bearing seat 13, impeller shaft 14.

Detailed ways

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

As shown in the drawings, the fan is mainly composed of air inlet protective net 1, fan impeller 2, outer cylinder 3, inner cylinder 4, air motor 5, air inlet and outlet pipes 6, air outlet protective net 9, air distribution device, motor torque transmission device, etc. constitute. The wind distribution device is composed of the wind distribution wheel bearing block 10, the wind distribution wheel 7 and the wind distribution wheel shaft 11; There are several fixed blades on the wheel 7, and these blades together with the outer cylinder 3 form 1 to 2 air outlets, and several adjustable blades 8 with petioles are also arranged on the wind distribution wheel 7, and the adjustable blades 8 pass through the nuts. Fastened on the hub of the pneumatic wind distribution wheel 7, the rotating speed of the wind distribution wheel can be controlled by changing the angle of the blades 8 according to actual needs. The motor torque transmission device is composed of the impeller bearing seat 13 and the impeller shaft 14. The impeller shaft 14 is installed in the impeller bearing seat 13 through the bearing and connected with the air motor 5 with screws, and then put into the inner tube 4 together and fixed with screws. The air motor 5 A muffler is installed on the outlet pipe of the motor to reduce the aerodynamic noise at the motor outlet. Fan impeller 2 is contained on the impeller shaft 14, and the front end of urceolus 3 is equipped with import protection net 1. The wind distribution wheel shaft 11 is installed in the wind distribution wheel bearing seat 10 through bearings, the wind distribution wheel 7 is installed on the wind distribution wheel shaft 11, and the wind distribution wheel bearing seat 10 is fixed to the rear end of the inner cylinder 4 with screws, and the rear end of the outer cylinder 3 The end is equipped with an outlet protection net 11. The outer cylinder 3 and the inner cylinder 4 are connected and fixed through guide vanes 12 .

Its working principle: When the inlet of the air motor 5 is connected with compressed air, the main shaft of the air motor 5 drives the impeller 2 to rotate at high speed through the impeller shaft, and the suction air enters the fan impeller 2 from the air inlet with the protective net 1 to obtain energy. After passing through the annular channel with the guide vanes 12, the air flow basically becomes axial, which drives the wind distribution wheel 7 to rotate at a low speed, thereby generating a turbulent gas jet in a cone-shaped area. The flow direction of the airflow inside the fan is shown by the arrows in the figure. Changing the installation angle of the adjustable blade 8 can change the rotational speed of the wind distribution wheel 7, thereby adjusting the airflow disturbance frequency. By adopting different forms of wind distributing wheels 7, gas jets with different characteristics can be obtained.

Claims (5)

1. disturbance jet-flow pneumatic blower fan, it is characterized in that: it comprises urceolus (3), inner core (4) with the same axle center of urceolus (3), be provided with the stator (12) that is fixed and is connected between urceolus (3) and the inner core (4), be provided with gas motor (5) in the inner core (4), gas motor (5) rear portion is provided with air blowing device, the front portion is provided with the motor torsional moment transfer unit, the motor torsional moment transfer unit is provided with draught fan impeller (2), the front portion of urceolus (3) is provided with intake grill protective net (1), and the rear portion is provided with exhaust outlet protective net (9).

2. disturbance jet-flow pneumatic blower fan according to claim 1, it is characterized in that: described air blowing device is located at the cloth wind wheel (7) on the cloth rotor shaft bearing (10) and is located at interior cloth rotor shaft (11) formation of cloth rotor shaft bearing (10) by cloth rotor shaft bearing (10).

3. disturbance jet-flow pneumatic blower fan according to claim 2, it is characterized in that: described cloth wind wheel (7) is provided with some stator blades, these blades constitute 1～2 exhaust outlet with urceolus (3), also be provided with some the adjustable vanes (8) that have petiole on the cloth wind wheel (7), adjustable vane 8 is fastened on the wheel hub of cloth wind wheel (7) by nut.

4. disturbance jet-flow pneumatic blower fan according to claim 1 is characterized in that: described motor torsional moment transfer unit is made of with the impeller shaft (14) that is connected with gas motor (5) transmission shaft the impeller shaft bearing (13) of fixed air motor (5).

5. disturbance jet-flow pneumatic blower fan according to claim 1 is characterized in that: described gas motor (5) outlet pipe is provided with baffler.