US5969236A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Particle sensor
Assignee: NGK Insulators Ltd
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Filing: 1997-08-15
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Granted: 1999-10-19
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Expires: 2017-08-15
Abstract
Abstract A particle sensor includes, a sensor element including (a) a vibrating section having a mass that is sensitive to the collision of solid particles contained in a fluid with the vibrating section and (b) a detecting section for detecting the vibration of the vibrating section caused by the collision and converting the vibration to electric signals, a housing for fixing said sensor element, an inlet nozzle forming a fluid inlet, and an outlet nozzle forming a fluid outlet. In the particle sensor, the outlet nozzle is provided so that the sensor element is between the inlet nozzle and the outlet nozzle, throughholes are formed in the sensor element in at least part of the vicinity of the vibrating section, and the fluid entering the particle sensor from the inlet nozzle collides with the sensor element, passes through the throughholes and leaves the particle sensor from the outlet nozzle. The particle sensor has such a characteristic structure that the speed of a fluid colliding with the sensor element can be changed. The particle sensor can measure the sizes and particle size distribution of particles contained in a fluid, easily in a short time.
Inventors
- 👤 Toshikazu Hirota
- 👤 Kazuyoshi Shibata
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 07:16
CPC Classifications
G; G01; G01N; G01N15/00; G01N15/06; G01N15/0656; G01N29/00; G01N29/04; G01N29/045; G01N29/046; G01N29/22; G01N29/222; G01N3/00; G01N3/40; G01N3/48; G01N33/00; G01N33/26; G01N33/28; G01N2203/00; G01N2203/02; G01N2203/06; G01N2203/0617; G01N2203/0623; G01N2291/00; G01N2291/02; G01N2291/022; G01N2291/0226; G01N2291/024; G01N2291/02408; G01N2291/02416
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
169 words
A particle sensor comprising: a sensor element comprising (a) a vibrating section having a mass that is sensitive to the collision of solid particles contained in a fluid with the vibrating section and (b) a detecting section for detecting the vibration of the vibrating section caused by said collision and converting the vibration to electric signals, a housing for fixing said sensor element, an inlet nozzle forming a fluid inlet, and an outlet nozzle forming a fluid outlet, wherein said outlet nozzle is provided so that the sensor element is between the inlet nozzle and the outlet nozzle, throughholes are formed in the sensor element in at least part of the vicinity of the vibrating section, and the fluid entering the particle sensor from the inlet nozzle collides with the sensor element, passes through the throughholes and leaves the particle sensor from the outlet nozzle, and wherein said particle sensor has such a characteristic structure that the speed of a fluid colliding with the sensor element can be changed.
Claim 2
Dependent Claim
169 words
A particle sensor comprising: a sensor element comprising (a) a vibrating section having a mass that is sensitive to the collision of solid particles contained in a fluid with the vibrating section and (b) a detecting section for detecting the vibration of the vibrating section caused by said collision and converting the vibration to electric signals, a housing for fixing said sensor element, an inlet nozzle forming a fluid inlet, and an outlet nozzle forming a fluid outlet, wherein said outlet nozzle is provided so that the sensor element is between the inlet nozzle and the outlet nozzle, throughholes are formed in the sensor element in at least part of the vicinity of the vibrating section, and the fluid entering the particle sensor from the inlet nozzle collides with the sensor element, passes through the throughholes and leaves the particle sensor from the outlet nozzle, and wherein said particle sensor has such a characteristic structure that the speed of a fluid colliding with the sensor element can be changed.
Claim 3
Dependent Claim
63 words
A particle sensor according to claim 1, wherein the speed of a fluid colliding with the sensor element is changed by dividing a portion of fluid flow path located upstream of the inlet nozzle of the particle sensor into a plurality of branch flow paths, allowing each branch flow path to have a switching valve, and changing the opening state of each valve.
Claim 4
Dependent Claim
63 words
A particle sensor according to claim 1, wherein the speed of a fluid colliding with the sensor element is changed by dividing a portion of fluid flow path located downstream of the outlet nozzle of the particle sensor into a plurality of branch flow paths, allowing each branch flow path to have a switching valve, and changing the opening state of each valve.
Claim 5
Dependent Claim
186 words
A particle sensor constituted by combining a plurality of sensors each comprising: a sensor element comprising (a) a vibrating section having a mass that is sensitive to the collision of solid particles contained in a fluid with the vibrating section and (b) a detecting section for detecting the vibration of the vibrating section caused by said collision and converting the vibration to electric signals, a housing for fixing said sensor element, an inlet nozzle forming a fluid inlet, and an outlet nozzle forming a fluid outlet, wherein in each of said sensors said outlet nozzle is provided so that the sensor element is between the inlet nozzle and the outlet nozzle, throughholes are formed in the sensor element in at least part of the vicinity of the vibrating section, and the fluid entering the particle sensor from the inlet nozzle collides with the sensor element, passes through the throughholes and leaves the particle sensor from the outlet nozzle, and wherein said particle sensor has such a characteristic structure that a fluid is allowed to collide with the sensor elements of the individual sensors at different speeds.
Claim 6
Dependent Claim
186 words
A particle sensor constituted by combining a plurality of sensors each comprising: a sensor element comprising (a) a vibrating section having a mass that is sensitive to the collision of solid particles contained in a fluid with the vibrating section and (b) a detecting section for detecting the vibration of the vibrating section caused by said collision and converting the vibration to electric signals, a housing for fixing said sensor element, an inlet nozzle forming a fluid inlet, and an outlet nozzle forming a fluid outlet, wherein in each of said sensors said outlet nozzle is provided so that the sensor element is between the inlet nozzle and the outlet nozzle, throughholes are formed in the sensor element in at least part of the vicinity of the vibrating section, and the fluid entering the particle sensor from the inlet nozzle collides with the sensor element, passes through the throughholes and leaves the particle sensor from the outlet nozzle, and wherein said particle sensor has such a characteristic structure that a fluid is allowed to collide with the sensor elements of the individual sensors at different speeds.
Claim 7
Dependent Claim
40 words
A particle sensor according to claim 4, wherein the collision of a fluid with the sensor elements of the individual sensors at different speeds is achieved by allowing the inlet nozzles of the individual sensors to have different inner diameters.
Claim 8
Dependent Claim
46 words
A particle sensor according to claim 4, wherein the collision of a fluid with the sensor elements of the individual sensors at different speeds is achieved by allowing the distances between inlet nozzle top end and sensor element of the individual sensors to have different values.
Claim 9
Dependent Claim
40 words
A particle sensor according to claim 4, wherein the collision of a fluid with the sensor elements of the individual sensors at different speeds is achieved by allowing a fluid to have different flow resistances downstream of the individual sensors.
Claim 10
Dependent Claim
44 words
A particle sensor according to claim 4, wherein the collision of a fluid with the sensor elements of the individual sensors at different speeds is achieved by allowing a fluid to have different flow resistances upstream of the sensor elements of the individual sensors.
Claim 11
Dependent Claim
47 words
A particle sensor according to claim 4, wherein the collision of a fluid with the sensor elements of the individual sensors at different speeds is achieved by allowing a fluid to be fed into the sensor elements of the individual sensors at different amounts per unit time.
References Cited (Backward Citations)
US3557616A
Cited
US3653253A
Cited
US3715911A
Cited
US3805591A
Cited
US3857049A
Cited
US3816773A
Cited
US4240287A
Cited
US4212190A
Cited
US4432228A
Cited
US4607228A
Cited
US4872335A
Cited
US5201322A
Cited
US5098657A
Cited
GB2241783A
Cited
US5257530A
Cited
US5616872A
Cited
US5455475A
Cited
US5698931A
Cited
GB2294551A
Cited
EP0766086A2
Cited
EP0769695A2
Cited
US5747671A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2002-10-18 | 2003-04-19 | 2003-10-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2006-10-18 | 2007-04-19 | 2007-10-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2010-10-18 | 2011-04-19 | 2011-10-19 | $7700.00 | Window Closed / Lapsed |