RU94012333A - Hot-wire sensor for measuring air flow rate - Google Patents

Hot-wire sensor for measuring air flow rate

Info

Publication number
RU94012333A
RU94012333A RU94012333/28A RU94012333A RU94012333A RU 94012333 A RU94012333 A RU 94012333A RU 94012333/28 A RU94012333/28 A RU 94012333/28A RU 94012333 A RU94012333 A RU 94012333A RU 94012333 A RU94012333 A RU 94012333A
Authority
RU
Russia
Prior art keywords
measuring temperature
sensitive resistor
hot
channels
flow
Prior art date
Application number
RU94012333/28A
Other languages
Russian (ru)
Other versions
RU2086921C1 (en
Inventor
В.А. Хлыст
В.А. Макаров
Н.А. Барыкин
М.И. Шнейдер
В.А. Борисов
М.А. Коган
Original Assignee
Акционерное общество открытого типа "Югмера" г.Краснодар
Научно-исследовательский институт теплоэнергетического приборостроения г.Москва
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Акционерное общество открытого типа "Югмера" г.Краснодар, Научно-исследовательский институт теплоэнергетического приборостроения г.Москва filed Critical Акционерное общество открытого типа "Югмера" г.Краснодар
Priority to RU94012333A priority Critical patent/RU2086921C1/en
Publication of RU94012333A publication Critical patent/RU94012333A/en
Application granted granted Critical
Publication of RU2086921C1 publication Critical patent/RU2086921C1/en

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Abstract

FIELD: instrument making. SUBSTANCE: hot-wire sensor has housing, major air duct made up as a Venturi pipe mounted inside the housing, measuring temperature-sensitive resistor working zone of which is in the converging device, and flow straightener. The outer side of the major air duct is provided with two ribs. The chambers are connected with the converging device through a by- pass. The inlet of the by-pass is the ring slot. The outlet of the by-pass is a row of openings arranged over periphery at the nearest site of the air duct. The measuring temperature-sensitive resistor is connected through wires with the electronic circuit of the output signal shaper mounted on a board. The flow straightener is made up as channels on the sides of converging device that face working surfaces of the measuring temperature- sensitive resistor oriented in the direction of the flow. The baffles between the channels can be in a contact with the working surfaces of the measuring temperature- sensitive resistor or be in the vicinity of them. A distance between the baffles does not exceed 0.5 of the width of the working zone of the measuring temperature- sensitive resistor. EFFECT: enhanced reliability. 2 cl, 3 dwg

Claims (1)

Изобретение относится к области приборостроения, а более конкретно к термоанемометрическим датчикам расхода воздуха, и может быть использовано, например, в системах электронного впрыска топлива в автомобильных двигателях внутреннего сгорания. Термоанемометрический датчик расхода воздуха содержит корпус, внутри которого расположен основной воздуховод в виде трубы Вентури, на внешней поверхности основного воздуховода выполнены два ребра. Камеры соединены байпасным каналом с сужающим устройством, входом в байпасный канал является кольцевая щель, а выходом ряд отверстий, расположенных по окружности в самом узком месте воздуховода, измерительный терморезистор, рабочая зона которого расположена в сужающем устройстве и выпрямитель потока. Измерительный терморезистор посредством проводников соединен с электронной схемой формирователя выходного сигнала, расположенной на плате. Новым в устройстве является выполнение выпрямителя потока в виде каналов на поверхностях сужающего устройства, обращенных к рабочим плоскостям измерительного терморезистора, ориентированные вдоль потока, при этом перегородки между каналами могут соприкасаться с рабочими поверхностями измерительного терморезистора или располагаться вблизи от них, а расстояние между перегородками каналов не превышает 0,5 ширины рабочей зоны измерительного терморезистора.The invention relates to the field of instrumentation, and more particularly to hot-air sensors of air flow, and can be used, for example, in electronic fuel injection systems in automotive internal combustion engines. The hot-wire air flow sensor contains a housing, inside of which the main duct is located in the form of a venturi, two fins are made on the outer surface of the main duct. The chambers are connected by the bypass channel to the constriction device, the entrance to the bypass channel is an annular gap, and the output is a series of holes located around the circumference at the narrowest point of the duct, a measuring thermistor, the working zone of which is located in the constriction device, and a flow rectifier. The measuring thermistor is connected via conductors to the electronic circuit of the output driver located on the board. New in the device is the implementation of a flow rectifier in the form of channels on the surfaces of the constricting device, facing the working planes of the measuring thermistor, oriented along the flow, while the partitions between the channels can be in contact with the working surfaces of the measuring thermistor or close to them, and the distance between the channel partitions is not exceeds 0.5 of the width of the working zone of the measuring thermistor.
RU94012333A 1994-04-07 1994-04-07 Thermo-anemometric air flow transducer RU2086921C1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
RU94012333A RU2086921C1 (en) 1994-04-07 1994-04-07 Thermo-anemometric air flow transducer

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
RU94012333A RU2086921C1 (en) 1994-04-07 1994-04-07 Thermo-anemometric air flow transducer

Publications (2)

Publication Number Publication Date
RU94012333A true RU94012333A (en) 1996-12-20
RU2086921C1 RU2086921C1 (en) 1997-08-10

Family

ID=20154470

Family Applications (1)

Application Number Title Priority Date Filing Date
RU94012333A RU2086921C1 (en) 1994-04-07 1994-04-07 Thermo-anemometric air flow transducer

Country Status (1)

Country Link
RU (1) RU2086921C1 (en)

Also Published As

Publication number Publication date
RU2086921C1 (en) 1997-08-10

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