CN2191630Y

CN2191630Y - Electronic spirometer

Info

Publication number: CN2191630Y
Application number: CN 94228915
Authority: CN
Inventors: 元文学; 孟昭莉; 毕毓秀; 邹继豪; 杜言梅
Original assignee: Dalian University of Technology
Current assignee: Dalian University of Technology
Priority date: 1994-06-14
Filing date: 1994-06-14
Publication date: 1995-03-15
Anticipated expiration: 2004-06-14

Abstract

The utility model relates to an electronic spirometer which belongs to an air flow measuring instrument. The electronic spirometer mainly adopts a hole plate type throttling device, a solid-state piezoresistance type differential pressure sensor, an A/D converter and a single-chip microcomputer system. Because the electronic spirometer integrates the electromechanical technique into integration, the utility model has the advantages of high precision, small size, convenient carrying and simple operation.

Description

Electronic spirometer

A kind of electronics spirometer, it belongs to the gas flow measurement instrument.

In the prior art, measure human body vital capacity float-type commonly used, Clothoid type, vane type spirometer.Float-type and Clothoid type are to use water as sealing surface, and the gas that is blown into changes volumetrical volume by the transmission of liquid, and measure the vital capacity of human body with the variation of this volume.And vane type is to utilize gas flow to promote the impeller rotation, measures the rotating speed of impeller by photoelectric sensor, thereby shows the human body vital capacity by secondary meter.Float-type and Clothoid type spirometer volume are big, Measuring Time long, low precision; The vane type spirometer is improved, but the frictional resistance of impeller and rotary inertia descend certainty of measurement, and service life is limited.

The purpose of this utility model is, develops a kind of spirometer, it should be simple in structure, volume is little, easy to carry, measure rapidly, precision is high and the life-span is long, to satisfy the growing needs of measurement vital capacity.

Technical solution of the present utility model is: a kind of electronics spirometer, it mainly is made up of the pick off, A/D converter, single-chip microprocessor system and the display that are installed in the measuring device, special character of the present utility model is, above-mentioned measuring device adopts the orifice-plate type throttling arrangement, this throttling arrangement is managed, is gone up pressure ring, orifice plate, following pressure ring and down-pipe by the upper reaches and forms, last pressure ring and following pressure ring are clipped in the middle orifice plate, and two ends lean on upper reaches pipe and down-pipe with being threaded and compressing.

Solid-state pressure resistance type differential pressure pick-up is adopted in pressure measurement, and the annular groove of last pressure ring and following pressure ring has measured hole to be connected with pick off.

The guiding theory of above-mentioned technical solution is: measure the human body vital capacity and adopt the orifice-plate type throttling arrangement to make apparatus structure simple, reliable operation, because when gas flows through orifice plate, pressure reduction before and after the orifice plate is easy to record with differential pressure pick-up, after the A/D conversion, trying to achieve vital capacity after the differential pressure signal input MICROCOMPUTER PROCESSING, last display result.Utilize the orifice-plate type throttling arrangement to combine, make whole measuring speed fast, the precision height with microprocessor system.

Effect of the present utility model is, this electronics spirometer mainly adopts orifice-plate type throttling arrangement, solid-state pressure resistance type differential pressure pick-up, A/D converter and single-chip microprocessor system, owing to use electromechanical integration technology, this apparatus structure compactness, volume are little, easy to carry, easy and simple to handle, certainty of measurement is 1.0 grades, are subjected to users' welcome deeply.

Description of drawings:

Accompanying drawing 1 is a kind of throttling arrangement structure chart of electronics spirometer.

Be an embodiment of the present utility model below, provide details of the present utility model by description and accompanying drawing to this embodiment.

Accompanying drawing 1 is a kind of throttling arrangement structure chart of electronics spirometer.Among the figure, the core members of throttling arrangement is orifice plate ［ 3 ］, and last pressure ring ［ 2 ］ and following pressure ring ［ 4 ］ are clipped in the middle orifice plate ［ 3 ］, then by upper reaches pipe ［ 1 ］ and down-pipe ［ 5 ］ with being threaded togather and compressing.Orifice plate ［ 3 ］ is generally made of stainless steel material, leans on a side of orifice plate ［ 3 ］ to be processed with ring-type pressure groove at last pressure ring ［ 2 ］ and following pressure ring ［ 4 ］.Because when gas flow through orifice plate ［ 3 ］, the pressure in the pressure groove of orifice plate ［ 3 ］ both sides changed, and can produce certain pressure reduction, as long as record pressure difference, just can easily try to achieve the gas flow that flows through orifice plate ［ 3 ］.Measure pressure reduction and adopt differential pressure pick-up ［ 8 ］, socket ［ 9 ］ is fixed on the down-pipe ［ 5 ］, there is pressure tap that pick off ［ 8 ］ is linked to each other with the pressure groove on socket ［ 9 ］ and the down-pipe ［ 5 ］, pick off ［ 8 ］ is easy to measure the pressure reduction of orifice plate ［ 3 ］ both sides, and gives secondary meter through cable ［ 7 ］ and be for data processing.Cover ［ 6 ］ plays the protection dustproof effect to pick off ［ 8 ］.

The differential pressure pick-up of acquired signal ［ 8 ］ is general solid-state piezoresistive pressure sensor, its long-time stability are good especially, various performance indications all can satisfy the high precision measurement of vital capacity, the signal that pick off ［ 8 ］ is gathered is sent into single-chip microprocessor system and is tried to achieve the vital capacity value by integration behind A/D converter, at last by the display display result.

Claims

1, a kind of electronics spirometer, it mainly is made up of the pick off, A/D converter, single-chip microprocessor system and the display that are installed in the measuring device, of the present utility model being characterised in that, above-mentioned measuring device adopts the orifice-plate type throttling arrangement, this throttling arrangement is made up of upper reaches pipe [1], last pressure ring [2], orifice plate [3], following pressure ring [4] and down-pipe [5], last pressure ring [2] and following pressure ring [4] are clipped in the middle orifice plate [3], and two ends lean on upper reaches pipe [1] and down-pipe [5] with being threaded and compressing.

According to the described electronics spirometer of claim 1, it is characterized in that 2, solid-state pressure resistance type differential pressure pick-up ［ 8 ］ is adopted in pressure measurement, the annular groove of last pressure ring ［ 2 ］ and following pressure ring ［ 4 ］ has measured hole to be connected with pick off ［ 8 ］.