Differential pressure type pneumatic valve

Abstract

The invention relates to a differential pressure type pneumatic valve, which is characterized by comprising a valve body and a valve core. The valve core is arranged in a cavity of the valve body along the vertical direction of the valve body; one end of the valve core is tightly matched with a gas outlet of an input cavity (2) on a valve wall, the other end of the valve core is combined with an adjusting screw (9) through a silicone spring (12) and a steel ball (11), and the adjusting screw (9) is screwed on the valve wall; the cavity of the valve body is divided by a horizontal elastic diaphragm (14) into an output cavity (15) and a control cavity (17); the elastic diaphragm (14) is arranged on the valve core through a central shaft hole in a penetrating way and is fixedly connected with the valve core, and the peripheral edge of the elastic diaphragm (14) is fixedly connected with the valve body; the input cavity (2) is connected with an air source through an input port (3), and the wall of the output cavity (15) is provided with an output port (4); the wall of the control cavity (17) is provided with an air hole communicated with a throttling needle valve (18); and one path of the output port (4) is connected with an air-oxygen mixer of a ventilator, and the other path of the output port (4) is connected with an input port of the throttling needle valve (18).

Description

technical field [0001] The present invention relates to a differential pressure pneumatic valve applicable to a pneumatic air-controlled ventilator, in particular to a pneumatic air-controlled ventilator capable of independently adjusting the breathing frequency without changing the inspiratory-expiratory ratio. By adjusting the breathing frequency, The respiratory rate can be continuously adjusted without changing the minute ventilation. Background technique [0002] The pneumatic valve is the most critical component of the pneumatic air-controlled ventilator. Whether its performance is stable or not directly determines whether the performance indicators of the pneumatic air control can be accurately controlled. The pneumatic air-controlled ventilator used in modern medical institutions mainly has two types of pneumatic valves: [0003] 1. Piston-type pneumatic valve, its disadvantage is easily affected by friction. After the pneumatic valve works for a period of time, due ...

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Problems solved by technology

[0003] 1. Piston-type pneumatic valve, its disadvantage is easily affected by friction. After the pneumatic valve works for a period of time, due to the change of its friction, the output value and the marked value are prone to large errors, especially how to overcome static friction to become a piston-type pneumatic valve. The main problem of the valve is that when the ventilator is left unused for a long time, it is very easy to cause the ventilator to fail to start;

[0004] 2. Diaphragm pneumatic valve, its disadvantage is easily affected by the ambient temperature. When the ambient temperature changes greatly, the elasticity of the diaphragm changes greatly, resulting in a mismatch between the diaphragm and the pre-compressed spring, which also causes the ventilator Unstable performance

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