Gas sensor
JPWO2025249081A5Pending Publication Date: 2026-07-06
Patent Information
- Authority / Receiving Office
- JP · JP
- Patent Type
- Applications
- Filing Date
- 2025-05-01
- Publication Date
- 2026-07-06
AI Technical Summary
Technical Problem
Conventional gas sensors experience impaired response due to insufficient gas replacement within the protector, leading to reduced sensitivity and responsiveness.
Method used
The gas sensor incorporates a cylindrical protector with a reduced diameter section and expanded diameter sections, utilizing the Venturi effect to enhance gas flow rate and promote uniform gas displacement, while minimizing contact with the sensor element.
Benefits of technology
The design improves the sensor's responsiveness by ensuring stable and uniform gas flow, enhancing its ability to detect gas concentrations effectively.
✦ Generated by Eureka AI based on patent content.
Abstract
[Problem] To provide a gas sensor that has excellent responsiveness. [Solution] A gas sensor 10 comprising: a sensor element 100 that extends in an axis O direction; and a tubular protector 51 that covers a tip end section of the sensor element, wherein the protector has a gas introduction hole 56, and a gas discharge hole 53 that is further to the tip end side than the gas introduction hole, a diameter reduction section 55 in which the diameter is reduced toward the inside in a radial direction is provided to the inner surface of the protector, in a region R between the gas introduction hole and the gas discharge hole in the axis direction, the minimum value D1 of the equivalent circle diameter of the inner surface of the diameter reduction section is 0.90-0.99 of the maximum value D2 of the equivalent circle diameter of the inner surface of the protector, and in the region R, diameter increase sections 57a, 57b in which the diameter is increased toward the outside in the radial direction relative to the diameter reduction section are respectively provided to the tip end side and the rear end side of the diameter reduction section.
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