Automatic control device for the cleaning power of a vacuum cleaner
First Claim
1. An automatic control device for regulating power to and a negative pressure or vacuum produced by a vacuum cleaner, wherein a blower is driven by an electric motor to generate said negative pressure, said control device comprising:
- a control circuit and two switches positioned in the path of the vacuum produced by said blower and operable by the negative pressure applied thereto, said switches having been adjusted to operate each at a different threshold value of negative pressure and connected to the control circuit, such that the blower motor is regulated by the control circuit to increase speed when the vacuum remains below the lower of said vacuum threshold values, the blower motor is stabilized at constant power when the vacuum produced is between the two vacuum threshold values, and said motor is regulated to decrease speed when the produced vacuum exceeds both said threshold values, the vacuum switches being connected in circuit to a storage element whose momentary output value determines the power applied to the blower motor by the control circuit, said control circuit further including means to smoothly change said storage element output value when said vacuum produced in operation is not between said threshold values.
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Accused Products
Abstract
In connection with an automatic control device for the cleaning power of a vacuum cleaner, comprising a blower, a blower drive motor and an associated control circuit for the latter, it is proposed to provide two vacuum switches adjusted to different vacuum threshold value or one vacuum double switch presetting the two vacuum threshold values, and to drive a storage (counter, capacitor), whose output configurations determine the manner in which a phase control circuit, which is connected in series with the blower drive motor, is driven, by a corresponding configuration of the switching conditions of the said switches. It is possible in this manner, with only two existing vacuum switches, to operate the blower drive motor at a predetermined power plateau, without any switching actions, so long as the vacuum generated remains within a predetermined window.
103 Citations
21 Claims
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1. An automatic control device for regulating power to and a negative pressure or vacuum produced by a vacuum cleaner, wherein a blower is driven by an electric motor to generate said negative pressure, said control device comprising:
a control circuit and two switches positioned in the path of the vacuum produced by said blower and operable by the negative pressure applied thereto, said switches having been adjusted to operate each at a different threshold value of negative pressure and connected to the control circuit, such that the blower motor is regulated by the control circuit to increase speed when the vacuum remains below the lower of said vacuum threshold values, the blower motor is stabilized at constant power when the vacuum produced is between the two vacuum threshold values, and said motor is regulated to decrease speed when the produced vacuum exceeds both said threshold values, the vacuum switches being connected in circuit to a storage element whose momentary output value determines the power applied to the blower motor by the control circuit, said control circuit further including means to smoothly change said storage element output value when said vacuum produced in operation is not between said threshold values. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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19. An automatic control device for regulating power to and a negative pressure or vacuum produced by a vacuum cleaner, wherein a blower is driven by an electric motor to generate a negative pressure, said control device comprising:
a control circuit and two switches positioned in the path of the vacuum produced by said blower and operable by the negative presser applied thereto, said switches having been adjusted to operate each at a different threshold value of negative pressure an connected to said control circuit such that said blower motor is regulated by said control circuit to increasing speed when the vacuum produced by said blower remains below both of said vacuum threshold values, said blower operating at a constant power when the vacuum produced is at a level between said two vacuum threshold values, said motor being regulated by said control circuit to decreasing speed of said blower when both said vacuum threshold values are lower than the vacuum produced by said blower, said vacuum switches being in circuit with a storage element whose momentary output value determines the power applied to said blower motor by said control circuit, said control circuit further including means to substantially smoothly change aid storage element output value when said vacuum produced in operation is not between said threshold levels. - View Dependent Claims (20)
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21. An automatic control device for regulating power to and a negative pressure produced by a vacuum cleaner, wherein a blower is driven by an electric motor to generate said negative pressure, said control device including a control circuit able to operate said blower motor at different power levels, and pressure switch means for detecting a deviation of produced negative pressure from a predetermined standard, said control circuit including a storage element whose momentary output determines the power applied to said blower, and means to change said storage element output in response to said deviation until said deviation is eliminated, the rate of change of said storage element output being predetermined and constant and independent of the magnitude of said deviation.
Specification