초록 ▼

A demand responsive central vacuum system having a vacuum producer driven by a variable speed motor and connected to a piping system having inlet ports located in areas to be cleaned. Wet and dry separators are connected in tandem in the piping system between the inlet ports and the vacuum producer.

A demand responsive central vacuum system having a vacuum producer driven by a variable speed motor and connected to a piping system having inlet ports located in areas to be cleaned. Wet and dry separators are connected in tandem in the piping system between the inlet ports and the vacuum producer. A flow switch detects when a flow condition is present in the piping system indicating that the vacuum system is in use and provides a signal to a controller which increases the operational speed of the drive motor and opens a bleed valve connected to the piping system to bleed air into the piping system.

대표청구항 ▼

[ I claim:] [1.] In a central vacuum cleaning system having a vacuum producer, a piping system connected to said vacuum producer and including at least one inlet valve having an open position and a closed position, the inlet valve in its open position allowing air to flow into said piping system, th

[ I claim:] [1.] In a central vacuum cleaning system having a vacuum producer, a piping system connected to said vacuum producer and including at least one inlet valve having an open position and a closed position, the inlet valve in its open position allowing air to flow into said piping system, the inlet valve in its closed position substantially blocking flow of air into said piping system, at least one separator connected to said piping system between said one inlet valve and said vacuum producer and through which air is constrained to pass in flowing from said inlet valve to said vacuum producer, and a control system for operating said vacuum producer, the improvement wherein said vacuum producer has a drive motor having a plurality of operational speeds and said control system includes flow sensing means for detecting a predetermined flow condition within said piping system and including a flow switch, and motor control means for altering the operational speed of said motor in response to the detection of said predetermined flow condition by said flow sensing means and including timing means for maintaining the operational speed of said motor for a predetermined period of time after an interruption in said predetermined flow condition and including a timing device operating in conjunction with said flow switch to delay the signal output from said flow switch.