CN104483067A

CN104483067A - Measuring method of dynamic unbalance amount of fan

Info

Publication number: CN104483067A
Application number: CN201410803080.4A
Authority: CN
Inventors: 钟银辉
Original assignee: Chongqing Kaite Engine Technology Co Ltd
Current assignee: Chongqing Kaite Engine Technology Co Ltd
Priority date: 2014-12-20
Filing date: 2014-12-20
Publication date: 2015-04-01

Abstract

The invention discloses a simple and practical measuring method of the dynamic unbalance amount of a fan. The method comprises steps as follows: 1), a to-be-measured fan is horizontally positioned by four elastic ropes, acceleration sensors are sequentially arranged in two adjacent quadrant positions of the to-be-measured fan, the to-be-measured fan is opened, and aX and ay are measured; 2), Newton laws of mechanics are adopted as follows: delta mrw<2> is equal to F which is equal to Ma, wherein r represents the radius of a fan blade, W represents the angular velocity of the fan and is shown as the specification, M represents the mass of the fan, a represents the accelerated velocity of the fan and is shown as the specification, by means of the formula, the dynamic unbalance amount of the fan is obtained as the specification M represents the mass of the fan, and n represents the rotating speed of the fan; and 3), ax and ay of the step 1) are substituted into the formula (I), and the dynamic unbalance amount of the to-be-measured fan can be calculated.

Description

A kind of method of testing of fan unbalancing value

Technical field

The present invention relates to a kind of method of testing of fan unbalancing value.

Background technology

Any rotor is when rotating around its axis, centrifugal force is produced due to the non-uniform mass relative to axis, this uneven centrifugal action can cause vibration on rotor bearing, produce noise and accelerate bearing wear, so that have a strong impact on performance and the life-span of product, electronics rotor, machine tool chief axis, I. C. engine crankshaft., the rotating parts such as turbine rotor so that fan all needs could operate reposefully through overbalance in the fabrication process.

For fan after manufacture or use before, need to test its unbalancing value, the present invention designs on this basis.

Summary of the invention

For above-mentioned weak point of the prior art, the present invention aims to provide a kind of method of testing of fan unbalancing value, simple and convenient, accurately can calculate the unbalancing value of fan to be measured.

To achieve these goals, technical scheme of the present invention: a kind of measuring method of fan unbalancing value, it comprises step has,

1), by fan to be measured by four elastic threads horizontal location, establish acceleration transducer successively in two adjacent quadrants positions of this fan to be measured, open fan to be measured, record a _x, a _y;

2), by mechanics Newton's law: Δ mrw ²=F=Ma

Wherein, r represents electric fan radius

W represents the angular velocity of fan,

M represents the quality of fan

A represents the acceleration of fan,

Can be obtained by above formula, fan unbalancing value is:

Δmr = \frac{Ma}{w^{2}} = \frac{M \sqrt{a_{x}^{2} + a_{y}^{2}}}{{(\frac{2 πn}{60})}^{2}} = \frac{900 M \sqrt{a_{x}^{2} + a_{y}^{2}}}{{(πn)}^{2}}

(1)

Wherein, M represents the quality of fan

N represents the rotating speed of fan;

3), by the 1st) a in step _xand a _ysubstitute in formula (one), namely can be regarded as to obtain the unbalancing value of fan to be measured.

Further, described fan to be measured is horizontally positioned on a stand by four elastic threads.

Further, the rotating speed n of described fan to be measured is measured by velocity gauge.

Beneficial effect of the present invention: the acceleration being measured fan two vertical quadrants directions to be measured by acceleration transducer respectively, and be substituting to the unbalancing value that formula can measure this fan to be measured, simple and convenient, very practical.

Accompanying drawing explanation

In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.

Fig. 1 is the structural representation sketch in the present invention.

Embodiment

The present invention is further described below in conjunction with specific embodiment and accompanying drawing.

A measuring method for fan unbalancing value as described in Figure 1, it comprises step has,

1), by fan 2 to be measured by four elastic threads 3 horizontal location, establish acceleration transducer 4 successively in two adjacent quadrants positions of this fan 2 to be measured, open fan 2 to be measured, record a _x, a _y;

2), by mechanics Newton's law: Δ mrw ²=F=Ma

Wherein, r represents electric fan radius

W represents the angular velocity of fan,

M represents the quality of fan

A represents the acceleration of fan,

Can be obtained by above formula, fan unbalancing value is:

Δmr = \frac{Ma}{w^{2}} = \frac{M \sqrt{a_{x}^{2} + a_{y}^{2}}}{{(\frac{2 πn}{60})}^{2}} = \frac{900 M \sqrt{a_{x}^{2} + a_{y}^{2}}}{{(πn)}^{2}}

(1)

Wherein, M represents the quality of fan

N represents the rotating speed of fan;

Wherein, described fan to be measured 2 is horizontally positioned on a stand 1 by four elastic threads 3.

The rotating speed n of described fan to be measured 2 is measured by velocity gauge, and the quality of fan 2 to be measured is measured by weighing scale.

Above the technical scheme that the embodiment of the present invention provides is described in detail, apply specific case herein to set forth the principle of the embodiment of the present invention and embodiment, the explanation of above embodiment is only applicable to the principle helping to understand the embodiment of the present invention; Meanwhile, for one of ordinary skill in the art, according to the embodiment of the present invention, embodiment and range of application all will change, and in sum, this description should not be construed as limitation of the present invention.

Claims

1. a measuring method for fan unbalancing value, is characterized in that: comprising step has,

1), by fan to be measured (2) by four elastic threads (3) horizontal location, acceleration transducer (4) is established successively in two adjacent quadrants positions of this fan to be measured (2), open fan to be measured (2), record a _x, a _y;

2), by mechanics Newton's law: Δ mrw ²=F=Ma

Wherein, r represents electric fan radius

W represents the angular velocity of fan,

M represents the quality of fan

A represents the acceleration of fan,

Can be obtained by above formula, fan unbalancing value is:

Δmr = \frac{Ma}{w^{2}} = \frac{M \sqrt{a_{x}^{2} + a_{y}^{2}}}{{(\frac{2 πn}{60})}^{2}} = \frac{900 M \sqrt{a_{x}^{2} + a_{y}^{2}}}{{(πn)}^{2}}

(1)

Wherein, M represents the quality of fan

N represents the rotating speed of fan;

2. the measuring method of a kind of fan unbalancing value according to claim 1, is characterized in that: described fan to be measured (2) is horizontally positioned on a stand (1) by four elastic threads (3).

3. the measuring method of a kind of fan unbalancing value according to claim 1, is characterized in that: the rotating speed n of described fan to be measured is measured by velocity gauge.