Automatic air-purifying system

• US 3,950,155 A
• Filed: 07/26/1973
• Issued: 04/13/1976
• Est. Priority Date: 07/28/1972
• Status: Expired due to Term

• Current Assignee: Janome Sewing Machine Company Limited
• Original Assignee: Janome Sewing Machine Company Limited
• Inventors: Komiyama, Uichi
• Primary Examiner(s): Nozick, Bernard
• Application Number:
  US05/382,979
• Time in Patent Office: 992 Days
• Field of Search: 55/104, 55/279, 55/274, 55/210, 55/316, 55/387, 55/467, 55/470-473, 55/DIG. 34, 417/14, 415/19, 98/115, 340/237 R, 340/237 S
• US Class Current: 96/111
• CPC Class Codes: B01D 46/46 automatic
• CPC Class Codes: F24F 11/30 for purposes related to the operation of the system, e.g. for safety or monitoring
• CPC Class Codes: F24F 11/32 Responding to malfunctions or emergencies
• CPC Class Codes: F24F 11/52 Indication arrangements, e.g. displays
• CPC Class Codes: F24F 11/70 Control systems characterised by their outputs; Constructional details thereof
• CPC Class Codes: F24F 11/88 Electrical aspects, e.g. circuits
• CPC Class Codes: F24F 2110/50 Air quality properties
• CPC Class Codes: F24F 8/15 by chemical means
• CPC Class Codes: G05D 21/02 characterised by the use of electric means
• CPC Class Codes: Y02B 30/70 Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating
• CPC Class Codes: Y10S 55/34 Indicator and controllers

Abstract

The system includes an electrically operated air-purifying unit for purifying the air in an at least substantially enclosed space. A sensor unit located in the enclosed space is operative for generating an electrical signal having valves indicative of the concentration of the impurities in the air contacting the sensor unit. A warning device issues a warning signal when the concentration of impurities in the air contacting the sensor unit exceeds a predetermined value.

Claims

1. An automatic air purification system, comprising, in combination, electrically operated air-purifying means for purifying the air in an at least substantially enclosed space by removing chemical impurities from the air in such enclosed space, said air-purifying means comprising a body of reducing-gas-absorbing material and electrically operated fan means for causing air to pass through said body of reducing-gas-absorbing material;

sensing means located in said enclosed space and operative for generating electrical signals having values indicative of the level of concentration of chemical impurities in the air contacting said sensing means;

warning means operative for issuing a warning signal; and

control means connected to said electrically operated fan means, connected to said sensing means and also connected to said warning means for controlling the operation of said electrically operated fan means and the operation of said warning means dependent upon said electrical signals generated by said sensing means.

2. A system as defined in claim 1, wherein said control means includes means for initiating operation of said fan means when the detected concentration of impurities in the air contacting said sensing means exceeds a predetermined value.

3. A system as defined in claim 1, wherein said electrically operated fan means includes an electrical fan motor, and wherein said control means includes a controllable electronic switch in the current path of said fan motor, said switch having a control input, and threshold detecting circuit means connected between said sensing means and said control input and operative for rendering said switch conductive when the signal at the output of said sensing means attains a predetermined value.

4. A system as defined in claim 1, wherein said control means comprises means operative for initiating operation of said electrically operated fan means in automatic response to generation by said sensing means of an electrical signal having a preselected first value indicative of a first concentration of chemical impurities, and means operative for causing said warning means to issue a warning signal in automatic response to generation by said sensing means of an electrical signal having a preselected second value indicative of a second concentration of chemical impurities greater than said first concentration, whereby an alarm signal is issued only when despite the operation of said purifying means the concentration of chemical impurities rises from said first to said second concentration.

5. A system as defined in claim 4, wherein said control means further includes selecting means for selecting one of said first and second values independently of the other of said first and second values.

6. A system as defined in claim 4, wherein said control means further includes selecting means for selecting said first value independently of said second value.

7. A system as defined in claim 4, wherein said control means includes means for terminating operation of said purifying means in automatic response to generation by said sensing means of an electrical signal having said preselected second value.