Air Oven Lid Layout Using a Compact BLDC Motor to Expand Oven Volume

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Solution Overview

Problem

The existing oven lids of large-capacity air ovens have a bulky shade-pole motor that occupies significant space, resulting in a less compact structure and reduced oven volume.

Innovation Solution

The use of a DC brushless motor with a compact design, integrated supports, and strategically formed recesses in the exhaust and circulation fans to reduce the overall size and enhance structural compactness, allowing for a more spacious oven interior.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of operation

If a shade-pole motor is employed in the oven lid, then the motor can drive the exhaust fan and circulation fan to rotate, but the motor occupies a large space, resulting in a larger appearance and less compact structure of the oven lid

Engineering Contradiction:

Improvemotor driving functionVSAvoidspace occupied by motor

Core Design Contradiction:

Ease of operationVSVolume of moving object

Solution Approach 1:

The patent replaces the traditional shade-pole motor with a DC brushless motor. This substitution transitions from a mechanical motor design to a more compact electromagnetic motor design, significantly reducing the space occupied by the motor while maintaining the driving function for the exhaust fan and circulation fan.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent changes the motor type parameter from shade-pole motor to DC brushless motor. This parameter change results in a more compact motor structure with smaller dimensions, allowing the oven lid to have a more compact overall structure and larger effective oven volume.

Inventive Principle:

Principle #35Parameter changes

2Volume of moving object

If a DC brushless motor is used to reduce motor size, then the space occupied by the motor is reduced, but additional components such as supports and positioning slots are required

Engineering Contradiction:

Improvespace occupied by motorVSAvoidstructural components

Core Design Contradiction:

Volume of moving objectVSDevice complexity

Solution Approach 1:

The patent integrates the support structures directly into the motor housing as an integrated molding. The supports are formed as part of the motor assembly, and the positioning slots are molded into the motor housing, combining multiple components into a single integrated unit. This reduces the number of separate parts while maintaining the compact size and structural integrity.

Inventive Principle:

Principle #5Merging (Combining)

Data Source

PatentUS20240044512A1Oven lid of large-capacity air oven

Publication Date: 2024.02.08 NINGBO BORINE ELECTRIC APPLIANCE CO LTD

AI summary

The present invention discloses an oven lid of a large-capacity air oven. The key point of the technical solution of the present invention is that the oven lid of the large-capacity air oven includes a casing, a middle casing is arranged inside the casing, and an inner casing is fixedly connected to the bottom of the middle casing; a DC brushless motor is employed, and due to the fact that the size of the DC brushless motor is small, which allows the space between the inner casing and the middle casing to be compressed, thereby expanding the volume of an inner oven body and making the space of the air oven larger; and in addition, a first recess, a second recess and a third recess are provided, so that structures among the middle casing, the inner casing, an exhaust fan and a circulation fan are more compact.