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Anti-explosion centrifugal fan and anti-explosion method thereof

A technology of centrifugal fan and explosion-proof motor, which is applied in the direction of mechanical equipment, machine/engine, liquid fuel engine, etc., and can solve problems such as unfavorable safety production, low fan safety, equipment and personnel injury, etc.

Pending Publication Date: 2021-05-11
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the current explosion-proof fans in the prior art often only consider electrical explosion-proof, that is, limit the ignition source of the motor to ensure safety, which makes the overall safety of the fan low in the use scene of a potentially explosive environment. When an ignition source is generated inside the fan, It is easy to cause injury to equipment and personnel, which is not conducive to safe production

Method used

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  • Anti-explosion centrifugal fan and anti-explosion method thereof
  • Anti-explosion centrifugal fan and anti-explosion method thereof
  • Anti-explosion centrifugal fan and anti-explosion method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] refer to figure 1 As shown, in the explosion-proof centrifugal fan of this embodiment, the electric power of the explosion-proof motor 10 is 5.5kW. The impeller 21 is made of 630 stainless steel, and its strength is 1.2 times the equivalent stress value of the maximum running speed. The casing 22 is made of 304 stainless steel and can withstand an impact pressure of 1.0 MPa through the impact test. The inner wall of the casing 22 is provided with a lining layer made of polytetrafluoroethylene with a thickness of 2mm. The axial and radial minimum one-sided gap between the impeller 21 and the casing 22 is 5 mm. The impeller 21 and the main shaft 31 are fixedly installed through a combination of a tapered bush and a flat key.

[0049] The explosion-proof centrifugal fan of this embodiment is subjected to a flame propagation test. The ethylene / air mixture is introduced into the test circuit pipeline, and the mixed gas is fully circulated by opening the throttle valve on t...

Embodiment 2

[0054] refer to figure 1 As shown, in the explosion-proof centrifugal fan of this embodiment, the electric power of the explosion-proof motor 10 is 18.5kW. The impeller 21 is made of 630 stainless steel, and its strength is 1.2 times the equivalent stress value of the maximum running speed. The casing 22 is made of 316 stainless steel, and has passed the impact test and can withstand an impact pressure of 1.0 MPa. The inner wall of the casing 22 is provided with a lining layer, which is made of stainless steel and has a thickness of 2mm. The axial and radial minimum one-sided gap between the impeller 21 and the casing 22 is 4 mm. The impeller 21 and the main shaft 31 are fixedly installed through a combination of a tapered bush and a flat key.

[0055] The explosion-proof centrifugal fan of this embodiment is subjected to a flame propagation test. The ethylene / air mixture is introduced into the test circuit pipeline, and the mixed gas is fully circulated by opening the throt...

Embodiment 3

[0061] refer to figure 1 As shown, in the explosion-proof centrifugal fan of this embodiment, the electric power of the explosion-proof motor 10 is 18.5kW. The impeller 21 is made of aluminum alloy, and its strength is 1.2 times the equivalent stress value of the maximum running speed. The casing 22 is made of cast iron and can withstand an impact pressure of 1.0 MPa through an impact test. The inner wall of the casing 22 is provided with a lining layer made of brass with a thickness of 2mm. The axial and radial minimum one-sided gap between the impeller 21 and the casing 22 is 5 mm. The impeller 21 and the main shaft 31 are fixedly installed through a combination of a tapered bush and a flat key.

[0062] The explosion-proof centrifugal fan of this embodiment is subjected to a flame propagation test. The ethylene / air mixture is introduced into the test circuit pipeline, and the mixed gas is fully circulated by opening the throttle valve on the test circuit until the air inl...

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Abstract

The invention discloses an anti-explosion centrifugal fan. The anti-explosion centrifugal fan comprises an impeller, a machine shell, a transmission assembly and an anti-explosion motor. The transmission assembly comprises a main shaft, a bearing and a coupler. The impeller, the machine shell and the transmission assembly are made of aluminum alloys or non-aluminum alloys, and the total mass fraction of aluminum and magnesium in the non-aluminum alloys is smaller than 15%. The invention further discloses an anti-explosion method of the anti-explosion centrifugal fan. The anti-explosion method comprises the steps that the impeller, the machine shell and the transmission assembly are made of materials which do not generate sparks during friction and collision; the rigidity of the machine shell and the impeller is set; a gap between the impeller and the machine shell is set to ensure that the impeller and the machine shell do not generate friction; the material and the thickness of a lining layer of the machine shell are set; and the impeller and the main shaft are mounted so as to ensure that the impeller and the main shaft are fixedly connected in the axial direction and the radial direction. According to the anti-explosion centrifugal fan and the anti-explosion method thereof, the risk that flammable and explosive media are ignited in the anti-explosion centrifugal fan is reduced through internal spark-free design.

Description

technical field [0001] The invention relates to the field of explosion-proof equipment, in particular to an explosion-proof centrifugal fan and an explosion-proof method thereof. Background technique [0002] When the material conveyed by the fan is flammable and explosive gas, for example, the scene where the mixed gas is conveyed from the tank area to the organic gas recovery device, the inside of the fan is in a potentially explosive environment (the air contains gas, steam, mist or dust). According to the three-element principle of fire and explosion formation, there are combustibles and combustibles in the potentially explosive environment inside the fan, which will cause hidden dangers of explosion accidents. [0003] The fan continuously inhales and discharges gas through the rotation of the impeller, so as to achieve the purpose of continuous blowing. During work, the friction between the rotor and the stator parts of the rotating equipment is a relatively common fa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F04D25/06F04D17/16F04D27/00F04D29/02F04D29/42
CPCF04D25/0606F04D17/16F04D29/4213F04D29/4226F04D27/001F04D29/023F05D2300/173F05D2300/171F05D2300/432
Inventor 李娜宫中昊程龙军于辉尹树孟
Owner CHINA PETROLEUM & CHEM CORP
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