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Thermal flowmeter

一种热式流量计、树脂的技术，应用在音量计量、测量流量/质量流量、液体/流体固体测量等方向，达到高测量精度的效果

Active Publication Date: 2017-07-18
HITACHI ASTEMO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, the improvement of the measurement accuracy of the gas flow rate is expected

Method used

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Examples

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Embodiment Construction

[0038] The modes for implementing the invention described below (hereinafter referred to as embodiments) solve various problems required as actual products, and in particular solve various problems expected to be used as a measuring device for measuring the amount of intake air of a vehicle. Subjects have various effects. One of the various problems to be solved by the following embodiments is the content described in the column of the problems to be solved by the above-mentioned invention, and one of the various effects played by the following embodiments is described in the column of the effect of the invention Effect. Various problems to be solved by the following embodiments and various effects achieved by the following embodiments will be described in the description of the following embodiments. Therefore, the problems and effects to be solved by the embodiments described in the following embodiments also describe the contents other than the contents in the column of th...

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Abstract

The invention aims to improve the measurement precision of a thermal flowmeter. The thermal flowmeter is characterized in that a flow measuring circuit package (400) is molded with a first resin molding process, a casing (302) provided with an inlet groove (351), a front-side auxiliary access groove (332), an outlet groove (353) and the like is subjected to resin molding with a second resin molding process, and meanwhile, the peripheral surface of the circuit package (400) manufactured with the first resin molding process is wrapped with resin in the second resin molding process, so that the circuit package (400) is fixed in the casing (302).

Description

technical field [0001] This invention relates to thermal flow meters. Background technique [0002] A thermal flowmeter for measuring the flow rate of gas has a flow detection unit for measuring the flow rate, and is configured to measure the flow rate of the gas by heat transfer between the flow detection unit and the gas to be measured. The flow rate measured by the thermal flowmeter is widely used as an important control parameter of various devices. The characteristic of the thermal flowmeter is that it can measure the flow rate of gas, for example, the mass flow rate, with relatively high accuracy compared with other types of flowmeters. [0003] However, improvement in the measurement accuracy of the gas flow rate is more desired. For example, in a vehicle equipped with an internal combustion engine, the demand for low fuel consumption and the demand for exhaust gas purification are very high. In response to these demands, it is required to measure the intake air am...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01F1/684
CPCG01F1/684G01F1/6842G01F1/6845G01F1/692G01F1/6965G01F15/14
Inventor 德安升田代忍半泽惠二森野毅土井良介上之段晓
Owner HITACHI ASTEMO LTD