Exhaust passage structure and diaphragm pump
The exhaust passage structure with a differential pressure valve and tapered design addresses whistling noises in diaphragm pumps by managing airflow velocity and valve movement, maintaining efficient fluid discharge.
JP2025162256APending Publication Date: 2025-10-27MABUCHI MOTOR OKEN CO LTD
Patent Information
- Application Number
- JP2024065428
- Authority / Receiving Office
- JP · JP
- Patent Type
- Applications
- Current Assignee / Owner
- Filing Date
- 2024-04-15
- Publication Date
- 2025-10-27
AI Technical Summary
Technical Problem
Conventional exhaust passage structures in diaphragm pumps generate high-pitched whistling noises when high-pressure air is exhausted, and reducing the cross-sectional area to prevent noise compromises exhaust capacity.
Method used
The exhaust passage structure incorporates a differential pressure valve with varying cross-sectional areas and a tapered shape to minimize noise while maintaining practical exhaust performance, featuring a smaller downstream portion and larger upstream portion, and a diaphragm that seats on a valve seat to control airflow.
Benefits of technology
Prevents abnormal noises like whistling without compromising exhaust capacity by controlling airflow velocity and minimizing valve vibration, ensuring efficient fluid discharge.
✦ Generated by Eureka AI based on patent content.
Smart Images
Figure 2025162256000001_ABST
Abstract
To provide an exhaust passage structure capable of preventing noise such as a whistle sound from being generated from an exhaust passage although having practical exhausting performance.SOLUTION: An exhaust passage structure comprises: a pressure chamber 3 where an inflow passage 9 and an outflow passage 10 are opened; and a diaphragm 5 which partitions the pressure chamber 3 into an upstream-side fluid chamber 7 and a downstream-side fluid chamber 8. The exhaust passage structure also comprises: a check valve 11 which makes a fluid flow from the upstream-side fluid chamber 7 to the downstream-side fluid chamber 8; a fine exhaust passage 17 which discharges the fluid from the upstream-side fluid chamber 7; and an exhaust passage 18 which discharges the fluid from the downstream-side fluid chamber 8. A valve seat 19 where the exhaust passage 18 is opened is formed on a wall of the downstream-side fluid chamber 8, and the diaphragm 5 has a valve body 20 seated on the valve seat 19. The valve seat 19 and the diaphragm 5 constitute a differential pressure valve 22 which operates with the differential pressure between the upstream-side fluid chamber 7 and the downstream-side fluid chamber 8. The exhaust passage 18 is different in passage sectional area between a downstream part 18a and a downstream part 18b, and the passage sectional area of the upstream part 18b is larger than that of the downstream part 18a.SELECTED DRAWING: Figure 1
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Citation Information
Patent Citations
Pressure adjustment device
JP2021143647A