Adjuster Member Segmentation for Sealed Pressure Gauge Calibration
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Solution Overview
Problem
Existing pressure gauges with built-in adjusters require users to remove stickers or expose internal components to adjust the zero point, imposing an extra load and risk of unintended operation due to misalignment or vibration.
Innovation Solution
A physical quantity measuring device with a cylindrical case, sensor module, cap member, circuit board, and adjuster member, where the adjuster member includes a shaft with an engagement portion and operable portion, allowing adjustment from outside the case without exposing the interior or removing stickers, and featuring a sealing member and cover member to prevent moisture and dust ingress and unintended operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the adjuster pin is covered with a sticker to prevent unintended operation, then reliability is improved, but ease of operation deteriorates because the sticker must be removed for adjustment
Solution Approach 1:
The adjuster member is segmented into a shaft (inserted through the housing) and an operable portion (located outside the housing). This segmentation allows the operable portion to be accessible for adjustment while the shaft remains protected inside, eliminating the need to remove stickers or expose internal components.
Solution Approach 2:
The shaft acts as an intermediary element that transmits rotational force from the operable portion (outside the housing) to the electronic adjuster (inside the housing). This mediator allows adjustment operation without direct access to internal components, maintaining both protection and operability.
2Ease of operation
If the interior of the cylindrical case is exposed to allow adjustment, then ease of operation is improved, but reliability deteriorates due to risk of moisture and dust ingress
Solution Approach 1:
The adjuster member is divided such that only the operable portion is exposed outside the housing, while the shaft and engagement portion remain inside or pass through sealed openings. This segmentation enables adjustment without exposing the entire interior to environmental contaminants.
Solution Approach 2:
The housing maintains sealed openings (through holes) with specific local qualities - the shaft passes through hermetically sealed openings, allowing rotational operation while maintaining the sealed property of the housing interior against moisture and dust.
3Reliability
If the adjuster member is hermetically sealed to prevent moisture ingress, then reliability is improved, but ease of operation deteriorates due to restricted access for adjustment
Solution Approach 1:
The adjuster member is segmented into a shaft (passing through sealed openings) and an operable portion (accessible outside the housing). This allows the housing to maintain hermetic sealing while the operable portion remains accessible for adjustment operations.
Solution Approach 2:
The shaft serves as an intermediary that transmits rotational motion through the hermetically sealed opening. The shaft is rotatably coupled to the electronic adjuster inside while passing through the sealed housing, enabling adjustment without compromising the seal.
Data Source
AI summary
A physical quantity measuring device includes a cylindrical case provided with a through hole, a sensor module, a joint, a cap member, a circuit board including an electronic circuit and an electronic adjuster, a sealing member attached to the through hole, and an adjuster member capable of adjusting the electronic adjuster. The electronic adjuster includes an engaged portion disposed to face the through hole. The sealing member is provided with a housing recess opened to an outside of the cylindrical case, and a communication hole for bringing the housing recess into communication with an interior of the cylindrical case. The adjuster member includes a shaft that is hermetically attached in the communication hole, an engagement portion provided at a first end of the shaft to be engageable with the engaged portion, and an operable portion provided at a second end of the shaft and housed in the housing recess.