JPH02163498A - Fan controller - Google Patents

Abstract

PURPOSE:To keep off any drop in fan performance by installing a reversible rotation selecting part, rotating a motor clockwise or counterclockwise, in a control circuit driving this motor, and constituting this reversible rotation selecting part to rotate the motor clockwise or counterclockwise as long as the specified time after stoppage of the fan. CONSTITUTION:Air is fed to equipment including a combustor on the like out of a supply opening 9 from an inlet port 8 of a fan 4 by way of the inside of a casing 2, and dust or the like being inhaled together with air out of the inlet port 8 sticks to a part of an impeller 1 or the like. When output of a rotation detecting part 5 comes into an output state showing a stopped state from a normal service state of the fan 4, a reversible rotation selecting part 6 operates as long as the specified time, and such a voltage as repeating reversible rotation several time is impressed on the fan 4 by a control circuit 7. In consequence, vibration is added to the impeller 1 each time the equipment operates, so that dust or the like stuck on is in no case accumulated, thus any drop in blasting performance is prevented from occurring.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a control device for a blower that supplies combustion air in, for example, a combustion machine. The purpose of this is to prevent a decrease in the amount of air supplied.

BACKGROUND ART As shown in FIG. 3, a conventional blower 10 of this type is composed of an impeller 11, a casing 12, and a motor 13. The impeller 11 is attached to a shaft 14 of the motor 13 via a boss portion 15. , the motor 13 is controlled to rotate in a direction determined by the shape of the blades 16 constituting the impeller 11.

As a result, due to the rotation of the impeller 11 (indicated by a solid arrow), air passes from the suction port 17 through the impeller 11 and the casing 12, and from the air outlet 18 to the combustor (not shown).
However, as shown in Fig. 4, dust etc. gradually adhere to the vicinity of the recess of the blade f116 of the impeller 11, and the air blowing performance decreases as shown in Fig. 5, causing the supply air to decrease. decreases from Qo to Qa.

Therefore, if the equipment is significantly affected by the decrease in air volume, a filter 19 is provided upstream of the suction port 17 to prevent dust and foreign matter from entering.

Problems to be Solved by the Invention However, with the above configuration, the load resistance increases as shown in Figure 6 due to dust adhering to the filter itself on the blower suction side, causing the supply air to change from Qo to Qb.
As with the case without a filter, the problem was that the supply air decreased over time.

The present invention solves such conventional problems, and aims to forcibly rotate the impeller in forward and reverse directions for a certain period of time to vibrate the impeller itself and remove attached dust and the like from the impeller.

Above are the means to solve the problem! In order to solve problem I1, the blower control device of the present invention provides a control device for driving the motor in a blower consisting of an impeller, a casing, and a motor that can rotate in forward and reverse directions. The B circuit is provided with a forward/reverse rotation switching unit that rotates the motor in the forward and reverse directions, and the forward/reverse rotation switching unit rotates the motor in the forward and reverse directions for a certain period of time after the blower is stopped.

Function The present invention uses the above-mentioned control means to drive the motor in such a way that the impeller continuously rotates in forward and reverse directions for a certain period of time after the blower stops. Dust and the like that accumulate on the blades due to the excitation force acting on the blades are removed by the vibrations, thereby suppressing deterioration in the performance of the blower.

Embodiment Hereinafter, one embodiment of the present invention will be described based on the accompanying drawings.

FIG. 1 shows a blower 4 consisting of an impeller 1, a casing 2, and a motor 3 capable of forward and reverse rotation. It is driven by a control circuit 7 having.

In the above configuration, air is supplied from the suction port 8 of the blower 4,
The impeller l passes through the casing 2, and the combustion m is emitted from the air outlet 9.
(not shown), etc., but some of the dust that is sucked in with the air from the suction port 8 adheres to the impeller 1, etc., as shown in the time chart of FIG. When the output of the rotation detecting section 5 changes from the normal use state of the blower 4 to the output state indicating the stopped state, the forward/reverse rotation switching section 6 operates for a certain period of time T, and the voltage is increased to repeat forward/reverse rotation several times in the reverse wind 1!14. is applied by the control circuit 7. As a result, vibrations occur in the impeller l
Each time the equipment operates, some of the attached dust remains without accumulating, but it has the effect of preventing a significant drop in air blowing performance. Further, it goes without saying that the above-mentioned fixed time T is at a level that does not interfere with the operation sequence of the equipment.

Effects of the Invention As described above, according to the blower iTl device of the present invention, the following effects can be obtained.

Every time the blower starts and stops, the impeller is forcibly vibrated by forward and reverse rotation to remove dust, etc. that has adhered to the blades. It is possible to suppress the air loss and improve the reliability of the equipment.

[Brief explanation of the drawing]

Fig. 1 is a side cross-sectional view of a blower and control blocks showing an embodiment of the present invention, Fig. 2 is a time chart explaining the operation, Fig. 3 is a side cross-sectional view of a conventional blower, and Fig. 4 is a cross-sectional view of the blade showing the state of dust adhesion at the A-A cross section in Figure 3;
FIG. 6 and FIG. 6 are air blowing characteristic diagrams showing load changes in the conventional example. 1... impeller, 2... casing, 3
...Motor, 4...Blower, 5...
... Rotation speed detection section, 6 ... Forward/reverse rotation switching section, 7 ... Control circuit, 8 ... Suction port,
9...Air outlet. Name of agent Patent attorney Awa Yf Shigetaka Haka 1 person 2 ・- 3 ・- -1- 6... Hakiho Boots Sob Motor 迭I! L forward/reverse rotation cut-off 1 city II! 11 circuit pig amount

Claims (1)

[Claims] In a blower comprising an impeller, a casing, and a motor that can rotate in forward and reverse directions, a control circuit for driving the motor is provided with a forward/reverse rotation switching section that rotates the motor in forward and reverse directions, and the forward/reverse rotation switching section is configured to rotate after the blower is stopped. , a blower control device characterized by rotating a motor in forward and reverse directions for a certain period of time.