US 11,733,084 B2
High-precision weighing module with reduced thermal gradient
Dandan Huang, Changzhou (CN); Xiang Li, Changzhou (CN); Ping Zhang, Changzhou (CN); and JinJie Cai, Changzhou (CN)
Assigned to Mettler-Toledo (Changzhou) Precision Instruments Ltd., Changzhou (CN); Mettler-Toledo (Changzhou) Measurement Technology Ltd., Changzhou (CN); and Mettler-Toledo International Trading (Shanghai) Co., Ltd., Shanghai (CN)
Filed by Mettler-Toledo (Changzhou) Precision Instruments Ltd, Changzhou (CN); Mettler-Toledo (Changzhou) Measurement Technology Ltd., Changzhou (CN); and Mettler-Toledo International Trading (Shanghai) Co., Ltd., Shanghai (CN)
Filed on May 10, 2021, as Appl. No. 17/302,655.
Claims priority of application No. 202010393055.9 (CN), filed on May 11, 2020.
Prior Publication US 2021/0348963 A1, Nov. 11, 2021
Int. Cl. G01G 7/02 (2006.01); G01G 21/02 (2006.01); G01G 21/22 (2006.01); G01G 21/28 (2006.01); G01G 23/00 (2006.01)
CPC G01G 7/02 (2013.01) [G01G 21/02 (2013.01); G01G 21/22 (2013.01); G01G 21/286 (2013.01); G01G 23/00 (2013.01)] 10 Claims
OG exemplary drawing
 
1. An integrated high-precision weighing module, comprising:
a shell comprising a housing having an upper end surface provided with a through hole;
an electromagnetic force sensor, mounted in the shell, with a bearing head of the electromagnetic force sensor that extends upward from an upper end portion of the shell through the through hole;
a printed circuit board (PCB), mounted in the shell;
a weighing pan component, mounted on the bearing head;
a support ring that is sheathed over the bearing head and is located between the weighing head component and the shell, the support ring comprising a support plate and a mounting portion that is disposed on the support plate, wherein the support ring is sheathed over the bearing head, in a clearance fit, by means of the mounting portion; and
an air baffle ring, located on the support ring and disposed around the weighing pan component;
wherein a first airflow channel is formed among the shell, the support ring, and the air baffle ring, such that at least a part of the airflow in the shell flows to the outside though the first airflow channel when the integrated high-precision weighing module is powered on;
wherein the support plate is provided with a plurality of air channel holes that surround the mounting portion and are in communication with the through hole, a protrusion that extends upward is arranged in a circle at a periphery of the air channel holes, such that a flow channel is formed between the protrusion and the mounting portion; and
wherein a lower portion of the air baffle ring is in clearance-fit with an upper portion of the support ring to form a first gap channel, and the first airflow channel is formed by the flow channel being in communication with the first gap channel.