Measuring system for the control of residual dust in safety vacuum cleaners
First Claim
1. A safety vacuum cleaner including a measuring system for residual dust monitoring, comprising:
- a housing including an air passage having an inlet, an outlet, and a flow cross section;
a turbine at least partially disposed within said air passage, said turbine rotatable to move an air stream through said air passage, the air stream containing dust particles, said turbine electrically grounded such that electrical charges associated with the particles are removed upon contact of the particles with said turbine;
a filter element disposed within said air passage; and
at least one electrode disposed within said air passage downstream of said turbine, said electrode shaped as a grid covering said flow cross section of said air passage, said electrode conducting an electrical current responsive to contact with uncharged particles and emitting a measurement signal indicative of the amount of the particles in the air stream.
1 Assignment
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Accused Products
Abstract
A safety vacuum cleaner including a measuring system for residual dust monitoring, including a housing having an air passage with an inlet, an outlet, and a flow cross section. A turbine is disposed within the air passage and is rotatable to move an air stream through the air passage, the air stream containing dust particles. The turbine is electrically grounded such that electrical charges associated with the particles are removed upon contact of the particles with the turbine. A filter element is disposed within the air passage, and at least one electrode is disposed within the air passage downstream of the turbine, the electrode shaped as a grid covering the flow cross section of the air passage. The electrode conducts an electrical current responsive to contact with uncharged particles and emits a measurement signal indicative of the amount of the particles in the air stream.
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Citations
11 Claims
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1. A safety vacuum cleaner including a measuring system for residual dust monitoring, comprising:
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a housing including an air passage having an inlet, an outlet, and a flow cross section;
a turbine at least partially disposed within said air passage, said turbine rotatable to move an air stream through said air passage, the air stream containing dust particles, said turbine electrically grounded such that electrical charges associated with the particles are removed upon contact of the particles with said turbine;
a filter element disposed within said air passage; and
at least one electrode disposed within said air passage downstream of said turbine, said electrode shaped as a grid covering said flow cross section of said air passage, said electrode conducting an electrical current responsive to contact with uncharged particles and emitting a measurement signal indicative of the amount of the particles in the air stream. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
one of an optical and an acoustic alarm is given;
said turbine is switched off;
said filter element is changed; and
a second turbine and filter are activated.
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9. The vacuum cleaner of claim 6, wherein said processing unit is interfaced with one of an external data processing installation and a computer.
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10. The vacuum cleaner of claim 1, wherein said measurement signal is shown on a display, said displayed measurement signal corresponding to one or more of the following:
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a direct measurement signal;
a correlating particle number;
a proportional filter blocking; and
a degree of filter damage.
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11. The vacuum cleaner of claim 1, further comprising a storage unit, said storage unit receiving and storing said measurement signal.
Specification