Self-powered gas flow control pipe fitting

An air flow control, self-operated technology, applied in the direction of flow control, non-electric variable control, control/regulation system, etc., can solve the problem of complex exhalation detection system, and achieve the effect of compact and simple structure

Active Publication Date: 2009-06-17
SUNVOU MEDICAL ELECTRONICS
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  • Abstract
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Problems solved by technology

And this method makes the whole breath detection system complicated

Method used

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  • Self-powered gas flow control pipe fitting

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specific Embodiment

[0027] This example is used to illustrate the control of expiratory flow in nitric oxide breath detection. The round size is: the outer diameter of the inlet and outlet orifice plate is 1.4cm, and the diameter of the central hole is 4mm. The inner diameter of the valve is 1.4cm and the length is 3cm. The outer diameter of the fixed orifice plate is 1.3cm, the diameter of the central spiral opening is 3mm, and 4 round holes with an inner diameter of 2mm are evenly distributed on the circumference at a radius of 4mm. Their materials are polytetrafluoroethylene. The spring is made of SUS304 stainless steel wire with a diameter of 0.6mm and an elastic modulus of 7000kg / mm 2 , the central diameter of the spring is 1.2cm, the number of effective coils is 10, and the length is 2cm. The resulting spring constant is about 5g / mm. The cone spool is also made of stainless steel, with a length of 1.5cm and a top cylindrical diameter of 4mm.

[0028] Using the above data and the design ...

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Abstract

The invention discloses a self-actuated air flow control pipe fitting. The pipe fitting comprises a tubular valve body and an air inlet orifice plate and an air outlet orifice plate; the air inlet orifice plate is sealed by one end of a conical valve core which is matched with a moving orifice plate and a spring in the valve body, and the other end extends into the air outlet orifice plate to form an outlet circulation annular space. Air flow passes the air inlet orifice plate to propel the conical valve core to shift along the flow direction, thus changing area of the circulation annular space. The area of the circulation annular space decreases if the air flow pressure increases; the area of the circulation annular space increases if the air flow pressure decreases; meanwhile, adjustment and control of the self-actuated flow rate are realized by dynamic compensation of the compression force of the spring and change of equilibrium pressure. The pipe fitting is characterized in that the pipe fitting is only provided with an air chamber, and one valve core in the air chamber has both functions of starting a self-actuated valve and adjusting the flow rate, thus the pipe fitting has the advantages of simple and compact structure, small size, and convenient manufacture and use, and the pipe fitting is especially suitable for the flow control within the exhalation pressure range.

Description

technical field [0001] The present invention relates to a gas flow control device, more specifically, to a self-operated gas flow control tube device especially suitable for exhalation detection. Background technique [0002] Breath testing is a diagnostic method for detecting the concentration of gas molecules in exhaled breath as disease markers for disease judgment. Usually the concentration of markers is related to the expiratory flow, for example, the concentration of nitric oxide in exhaled air, which is a marker of airway inflammation, decreases with the increase of expiratory flow. In order to ensure the consistency of breath test results, it is necessary to control the expiratory flow within the normal range of expiratory pressure variation. For example, for the detection of exhaled nitric oxide, the current international standard recommends that the expiratory pressure of 50mL / s or 3L / min can be controlled within the range of 5-20cmH20 or 500-2000Pa expiratory pre...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N33/48G05D7/00
Inventor 韩杰苏燕
Owner SUNVOU MEDICAL ELECTRONICS
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