JPH06137657A - Control method of supply fan for airconditioning machine - Google Patents

Abstract

PURPOSE:To permit highly accurate control of a supply fan by a method wherein the supply fan is controlled by selecting a voltage control means or number- of-roations control means in accordance with the value of a difference between a set flow of air and an estimated flow rate of air. CONSTITUTION:A supply fan for an air-conditioning machine is rotated by a supply fan rotating means 15 and the number of rotations of the fan is controlled by a number-of-rotations control means 13 while the number of rotations is detected by number-of-rotations detecting means 14. A voltage supplied to the supply fan rotating means 15 is controlled by a voltage control means 12. A volume of air, set by a user, is detected by a set air volume detecting means 11. When the volume of air, set by the user, is smaller than an estimated one upon operating the air-conditioning machine, the supply fan rotating means 15 is controlled by a voltage control means 12. On the other hand, when the set air volume is bigger than the estimated one, the fan rotating means 15 is controlled by the number of rotation control means 13. According to this method, the number of rotations of the supply fan is controlled highly accurately.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a blower fan control method for a separate type air conditioner.

[0002]

2. Description of the Related Art In this type of conventional air conditioner, a method of controlling a blower fan only by the number of rotations and a method of controlling only a voltage are known.

[0003]

However, in the conventional method of controlling the blower fan only by the number of revolutions, the wind direction control plate is largely displaced from the maximum air flow generation position, and the air filter at the suction port has increased ventilation resistance due to dust or the like. In this case, the surging phenomenon in which the blower fan rotates irregularly tends to occur in the low air volume region during the cooling operation. Further, in the low air volume region during the heating operation, there is a large decrease in the air volume in the above state, and there is a risk that the refrigeration cycle will be overloaded.

In the method of controlling the blower fan only by the voltage, the number of steps is large because it is adjusted for each product, and it is difficult to perform adjustment with high accuracy.

[0005]

In order to solve the above-mentioned problems, a fan speed control method of the present invention comprises a blower fan rotating means,
In an air conditioner having a rotation speed detection means, a rotation speed control means, and a voltage control means for controlling the supply voltage of the blower fan rotation means, the set air volume of the user when the air conditioner is operating is lower than the preset air volume. When it is low, the blower fan rotation means is controlled by the voltage control means, and when it is higher than the preset air volume, the blower fan rotation means is controlled by the rotation speed control means.

Further, even if the air volume set by the user is within the rotation speed control range, the air volume is compared with a preset air volume and the control range width of the rotation speed is changed depending on the height.

[0007]

The present invention has made it possible to realize more accurate fan speed control with the above-described configuration.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a block diagram of an embodiment of the present invention. In the figure, the fan speed control is
A set air volume detection unit 11, a voltage control unit 12, a rotation speed control unit 13, a rotation speed detection unit 14, and a blower fan rotation unit 15 that detect the air flow set by the user are provided. Next, the operation of the fan speed control means having the above structure will be described with reference to the flowchart of FIG.

First, when the operation is started, the set air volume detection means 11 detects the air volume q set by the user, and the air volume Q1, Q2 (Q1 <Q2) preset in the indoor control section.
When q ≦ Q1, the voltage control means 12 outputs a voltage corresponding to the set air volume to the blower fan rotation means 15. When Q1 <q <Q1, the rotation speed control means 7 outputs a control signal to the blower fan rotation means. The rotation speed detection means compares the rotation speed N of the blower fan with the set rotation speed N1, and completes the setting when N = N1 ± R1 (R1 <R2).

When q ≧ Q2, the rotation speed control means 2 outputs a control signal to the blower fan rotation means. The rotation speed detection means compares the rotation speed N of the blower fan with the set rotation speed N2 and completes the setting when N = N2 ± R2.

[0011]

As described above, according to the fan speed control method for an air conditioner of the present invention, the direction of the wind direction control plate is displaced from the maximum air volume position, and the ventilation filter is increased due to dust or the like at the suction port. Also, it prevents the surging phenomenon that the blower fan rotates irregularly in the cooling low air volume region and prevents the overload of the refrigeration cycle due to the reduction of the air volume in the heating low air volume region.

Further, it is possible to prevent rotation speed reversal of each set air volume and realize more accurate fan speed control.

[Brief description of drawings]

FIG. 1 is a block diagram showing the configuration of the present invention.

FIG. 2 is a flowchart of the fan speed control method.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Toru Yasuda 1006 Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd.

Claims (2)

[Claims] 1. A blower fan rotation means for rotating a fan, and a rotation speed control means for controlling the rotation speed of the blower fan,
An air conditioner having a rotation speed detection means for detecting the rotation speed of the blower fan, a voltage control means for controlling a supply voltage to the blower fan rotation means, and a set air volume detection means for detecting a set air volume of a user, When the user-set air volume is lower than a preset air volume during operation of the air conditioner, the blower fan uses voltage control means, and when the air volume is higher than the preset air volume, the blower fan rotates to control the rotation speed. A method for controlling a blower fan of an air conditioner, which is controlled by using a number control means. 2. The control range of the number of revolutions is controlled by using the number of revolutions control means provided stepwise by setting an arbitrary air volume.
Blower fan control method for the air conditioner described.