# US 8,783,117 B2 · Fan testing apparatus and testing method

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- Number: US 8,783,117 B2
- Document ID: US8783117B2
- Status: Granted
- Kind: B2
- Application number: 13/459,098
- Filed: 2012-04-28
- Published: 2013-07-04
- Granted: 2014-07-22
- Earliest claimed: 2011-12-30
- Assignees: Hon Hai Precision Industry Co., Ltd.
- Applicants: Yao-Ting Chang
- Inventors: Yao-Ting Chang
- Web page: https://patentgrep.com/patent/US8783117B2

## CPC

- F04D 27/001: {Testing thereof; Determination or simulation of flow characteristics; Stall or surge detection, e.g. condition monitoring}
- G01P 21/02: of speedometers
- F04D: NON-POSITIVE-DISPLACEMENT PUMPS (engine fuel-injection pumps F02M; ion pumps H01J41/12; electrodynamic pumps H02K44/02)
- G01P: MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT (measuring or recording blood flow A61B5/02, A61B8/06; monitoring speed or deceleration of electrically-propelled vehicles B60L3/00; vehicle lighting systems adapted to indicate speed B60Q1/54; determining position or course in navigation, measuring ground distance in geodesy or surveying G01C; combined measuring devices for measuring two or more variables of movement G01C23/00; measuring velocity of sound G01H; measuring velocity of light G01J7/00; measuring direction or velocity of solid objects by reception or emission of radiowaves or other waves and based on propagation effects, e.g. Doppler effect, propagation time, direction of propagation, G01S; measuring speed of nuclear radiation G01T; measuring acceleration of gravity G01V; {measuring or recording the speed of trains B61L23/00; speed indicators incorporated in motor vehicles B60K35/00; measuring frequency or phase G01R; traffic control G08G})

## Abstract

A fan testing apparatus includes an air duct defining an air inlet and air outlet, and at least one anemometer mounted at the air outlet. The fan is received in the air duct to generate airflow in the air duct via the inlet and out of the air duct via the outlet, and the at least one anemometer is used to measure wind speed at the outlet.

## Claims

### Claim 1

A fan testing apparatus comprising:
a hollow air duct defining an air inlet and an air outlet respectively located at two opposite ends thereof;
at least one anemometer mounted to the air duct adjacent to the air outlet to measure a speed of the airflow generated by a fan mounted in the air duct;
wherein an access hole is defined in the air duct, adjacent to the air inlet of the air duct, for the fan inserted into or take out of the air duct; and
wherein opposite guide rails are attached to insides of the air duct, aligned with the access hole.

### Claim 2 (depends on 1)

The fan testing apparatus of the claim 1, wherein each of said at least one anemometer comprises a probe extending into the air duct, an airflow sensor is formed at a distal end of the probe.

### Claim 3 (depends on 2)

The fan testing apparatus of the claim 2, wherein said at least one anemometer comprises three anemometers respectively positioned adjacent to a top, a center, and a bottom of the air outlet of the air duct.

### Claim 4

A fan testing method comprising:
providing a fan testing apparatus comprising:
an air duct defining an air inlet, and an air outlet; and
at least one anemometer mounted to the air duct adjacent to the air outlet;
mounting a reference fan into the air duct;
powering on the reference fan to generate an airflow entering the air duct through the air inlet, and out of the air duct through the air outlet;
obtaining a speed Va of the airflow generated by the reference fan, through the air outlet with said at least one anemometer;
taking the reference fan out of the air duct, and mounting a to-be-tested fan into the air duct instead;
powering on the to-be-tested fan to generate an airflow entering the air duct through the air inlet, and out of the air duct through the air outlet;
obtaining a wind speed Vb of the airflow generated by the to-be-tested fan, through the air outlet with said at least one anemometer;
comparing the speed Vb with the speed Va, if the speed Vb is greater than or equal to the speed Va, the to-be-tested fan is eligible; if the speed Vb is smaller than the speed Va, the to-be-tested fan is ineligible.

### Claim 5 (depends on 4)

The testing method of claim 4, said at least one anemometer comprises three anemometers respectively positioned adjacent to a top, a center, and a bottom of the air outlet, for measuring speeds of the airflow.

### Claim 6 (depends on 5)

The testing method of claim 5, wherein the speed Va is an average value of the speeds Vr of the airflow at the three locations generated by the reference fan and measured by the three anemometers; the speed Vb is an average value of the speeds Vy of the airflow generated by the to-be-tested fan at the three locations and measured by the three anemometers.