Air cleaner for engines, having back flow gas shut-off function

• US 4,326,862 A
• Filed: 06/10/1980
• Issued: 04/27/1982
• Est. Priority Date: 06/10/1980
• Status: Expired due to Term

• Current Assignee: Nagatoshi Suzuki
• Original Assignee: Nagatoshi Suzuki
• Inventors: Suzuki, Nagatoshi
• Primary Examiner(s): LACEY, DAVID LYNN
• Application Number:
  US06/158,129
• Time in Patent Office: 686 Days
• Field of Search: 55/105, 55/127, 55/128, 55/139, 55/417, 55/DIG. 28, 55/126, 123/52 MF, 123/198 D
• US Class Current: 96/18
• CPC Class Codes: B03C 3/15 Centrifugal forces
• CPC Class Codes: B04C 2009/004 with internal filters, in the cyclone chamber or in the vortex finder
• CPC Class Codes: B04C 5/13 formed as a vortex finder and extending into the vortex chamber exits with bulkheads preventing reverse flow vortex B04C3/00; Discharge from vortex finder otherwise than at the top of the cyclone; Devices for controlling the overflow
• CPC Class Codes: B04C 9/00 Combinations with other devices, e.g. fans, expansion chambers, diffusors, water lockswith filters B01D50/00
• CPC Class Codes: F02M 35/02 Air cleaners
• CPC Class Codes: Y10S 55/28 Carburetor attached

Abstract

This invention discloses an air cleaning device for engines which is provided with a check valve within the induction pipe thereof to check the back flow of mixed fuel gas, and thereby prevent the engine back fire, particularly an intake air cleaner for engines in which a cyclone type dust collector having an electrostatic filter is used. In this invention is disclosed a device which can prevent the ignition of the mixed fuel gas and thereby avoid explosion of the said gas.

Claims

1. In an air cleaner for engines having a cyclone dust collector provided with an air intake and incorporating an electrostatic filter, an air induction pipe connecting said cyclone dust collector to the engine, and a high voltage generator connected to the electrostatic filter for applying high voltage to the electrostatic filter, the improvement comprising the air cleaner including a back flow gas check valve provided within said induction pipe and a switch connected to the high voltage generator and positioned and arranged with respect to the valve such that the switch is activated by the closing of said valve to stop the operation of said high voltage generator.

2. The apparatus according to claim 1 wherein the back flow gas check valve and the switch to stop the operation of the high voltage generator are fixed on an inner wall of said induction pipe.

3. The apparatus according to claim 1 or 2 wherein the switch is a microswitch and the valve is a butterfly valve.

4. In an air cleaner for engines having a cyclone dust collector provided with an air intake and incorporating an electrostatic filter, an air induction pipe for connecting said cyclone dust collector to the engine and a high voltage generator connected to the electrostatic filter for applying high voltage to the electrostatic filter, the improvement comprising a valve seat located within the induction pipe and defining an aperture, a valve element positioned and arranged for opening and closing the aperture of said valve seat to prevent the flow of back flow gas, and a switch connected to the high voltage generator and positioned and arranged with respect to the valve such that the switch is operated by the closing of the aperture by said valve element to shut off the high voltage generator.

5. The apparatus according to claim 4 wherein the valve element is in the shape of a leaf.