CN2480840Y - Qualiyty and flow controller for nitrogen-containing air - Google Patents

Abstract

The nitrogen-containing gas mass flow control device consists of a quick connection, a rotameter, a gas quick cut-off solenoid valve, a NO ₂ scavenger, a mass flow controller, a gas bypass switch, a gas flow alarm, and is connected through a stainless steel connecting pipe to form a normal requirement Two groups of gas supply circuits that require a large flow of gas, in which the gas quick cut-off solenoid valve is connected to the circuit of the ventilator through a cable. When the ventilator fails and stops working, it will be closed quickly to cut off the gas supply to the pipeline to prevent Accidents happen. The utility model can be matched and used with ventilators and auxiliary devices of different ventilation modes, has good safety and applicability, convenient maintenance and low price, and is suitable for use in hospitals at all levels.

Description

Nitrogen-containing gas mass flow control device

The nitrogen-containing gas mass flow control device relates to the safe use control technology of nitrogen gas, and is a new type of nitrogen-containing gas mass flow control device, which can be matched with ventilators or breathing assistance devices of different ventilation modes.

The application of nitrogen-containing gas is more and more extensive, and it is applied in different fields and has different requirements for use. Medical nitrogen-containing gas (such as nitric oxide) has been used as a medicine, so the monitoring and control requirements for the use of nitrogen-containing gas are even higher. For the measurement and control of the mass flow rate of nitrogen contained in medical gases, it is currently ideal to use thermal sensing technology detection devices for monitoring and control. This device mainly heats the wall of the measuring tube and the gas entering the measuring tube through the heating coil. When no gas flows into the measuring tube, the temperature between the temperature sensors at the upstream and downstream ends of the measuring tube is equal, and the bridge There is no signal output for current balance, and the display on the indicator is zero. When the heated gas flows through the measuring tube, there is a temperature difference between the temperature detected by the temperature sensor at the upstream end and the temperature sensor at the downstream end, the bridge current loses balance, and a voltage signal proportional to the mass flow rate of nitrogen gas is output. Displayed on the instrument, in order to control the mass flow of nitrogen gas. However, the structure of this device is complex, and the post-sequence detection steps in the monitoring and control start to work according to the signal output by the pre-sequence, which makes the whole monitoring and control response slow. In the case of a sudden power failure, the device is also prone to Accident.

Aiming at the deficiencies of existing thermosensitive technology monitoring devices, the utility model proposes a simple and reasonable structure, which can not only effectively monitor and control the mass flow of nitrogen gas, but also can automatically and quickly cut off the supply in case of emergency. A nitrogen-containing gas mass flow control device that ensures safety and can be matched with ventilators and auxiliary devices of different ventilation modes.

The utility model is constituted as follows: it is mainly composed of a quick interface, a rotor flowmeter, a mass flow controller, a gas bypass switch, a gas flow alarm, and a gas quick cut-off electromagnetic valve connected by a stainless steel connecting pipe. Among them, the rotameter is connected with the mass flow controller and the gas flow alarm to form the gas supply circuit of the nitrogen-containing gas under normal conditions through the gas quick cut-off solenoid valve, and the mass flow rate of the nitrogen-containing gas is controlled by the rotameter and the mass flow controller. Monitoring and control; when the flow rate of the mass flow controller cannot meet the needs, the gas supply circuit composed of the rotameter, the gas quick cut-off solenoid valve, the gas bypass switch and the gas flow alarm can be used to supply the gas. The gas flow is controlled. The gas flow alarm sets the upper and lower limits of the safe gas flow in advance according to the requirements of gas consumption. If the gas flow deviates from the set safe value during work, the gas flow alarm will automatically send out an alarm. In the event of a sudden power failure and/or when the ventilator stops working, or if a gas flow sensor is installed in the ventilation duct, if there is no change in the gas supply flow within 30 seconds, the main control device of the ventilator has stopped working and sends the signal Pass it to the gas flow alarm and the gas quick cut-off solenoid valve, start the solenoid valve to work, close the valve quickly, cut off the nitrogen-containing gas entering the pipeline and continue the gas supply, and prevent adverse reaction accidents due to excessive nitrogen content in the gas.

The utility model device has the advantages of: the rotor flowmeter in the device, the gas flow quickly cuts off the solenoid valve, the mass flow controller and the gas flow alarm, and the rotor flowmeter, the gas flow quickly cuts off the solenoid valve, the gas bypass switch and the gas flow rate The alarm constitutes two sets of safe and reliable mass flow control gas supply circuits, so that the nitrogen-containing gas can be used in a safe state. The quick interface is used to connect the air inlet and the air outlet. The connection speed is fast and the airtightness of the interface is good. There will be no nitrogen leakage at the place, and all the devices are connected by stainless steel connecting pipes, which prevents the inner wall of the pipes from being corroded due to long-term use. The utility model is simple and reasonable in structure, safe in use and low in cost, its price is only equivalent to 10% of the price of an imported ventilator, and can be matched with ventilators of different ventilation modes to monitor and control nitrogen-containing gas in real time Under the condition of medium nitrogen concentration, it has good applicability as a technical means of providing nitrogen during assisted ventilation and oxygen supply.

Accompanying drawing is the utility model embodiment accompanying drawing, wherein;

Figure 1 is a schematic diagram of matching the device of the present invention with the ventilator pipeline.

Fig. 2 is a schematic diagram of the structure of the device of the present invention.

The utility model is further described according to the above-mentioned accompanying drawings. The utility model includes a fast interface 2, a valve 3, a rotor flowmeter 4, a gas quick cut-off solenoid valve 5, a monitoring and control display instrument 6, a NO ₂ scavenger 7, a mass flow controller 8, a gas bypass switch 9, and a gas flow rate The alarm 10 is formed by connecting a stainless steel connecting pipe 11. Among them, the quick interface 2 is connected to the nitrogen-containing gas source, connected to the valve 3 through the stainless steel connecting pipe 11, and also through the stainless steel connecting pipe 11, the valve 3 is connected to the rotameter 4, and the rotameter 4 is connected to the gas quick cut-off solenoid valve 5, and the gas is quickly cut off. Cut off the solenoid valve 5 and the NO ₂ scavenger 7, the NO ₂ scavenger 7 is connected with the mass flow controller 8, the mass flow controller 8 is connected with the gas flow alarm 10, and then communicated with the gas supply pipe of the ventilator through the quick interface 2 Consists of a gas supply circuit under normal conditions, the NO ₂ remover 7 removes nitrogen dioxide in its body, the monitoring and control display 6 is connected to the mass flow controller 8, and monitors, controls and regulates the mass flow of nitrogen-containing gas , the gas flow alarm 10 sends an alarm when the flow rate is too high or too low beyond the safe gas supply requirements, and the gas quick-cut solenoid valve 5 is connected to the ventilator circuit through a cable. When the ventilator fails and stops working, the gas quick-cut solenoid Valve 5 will be closed quickly and in time to cut off the nitrogen-containing gas and continue to supply gas to the pipeline to prevent accidents caused by excessive nitrogen content. In addition, the valve 3 and the rotameter 4, the rotameter 4 and the gas quick cut-off solenoid valve 5, the gas quick cut off solenoid valve 5 and the gas bypass switch 9, the gas bypass switch 9 communicates with the gas flow alarm 10, and communicates with the After the ventilator is connected, it forms a gas supply circuit that requires a large flow rate of nitrogen-containing gas, so that the nitrogen-containing gas regulated and controlled by the rotameter 4 passes through the open gas bypass switch 9 and the gas flow alarm 10 to enter The air supply pipe of the ventilator is mixed with the gas in the air supply pipe of the ventilator, and the gas flow alarm 10 sends an alarm when the gas flow alarm exceeds the safe gas supply requirement. The utility model can be matched and used with a ventilator and its auxiliary device in a safe state.

The experimental data of the present utility model is as follows: when using 1000ppm nitrogen, its control flow needs to be adjusted according to the total flow of the air supply circuit of the ventilator. When the total flow is relatively constant, the NO concentration is set at 3 by adjusting the actual flow. -20ppm range, stable at <±1ppm level. Especially when the ventilator is used in constant pressure ventilation mode, the flow in the pipeline will change. When the control flow of low concentration NO (<10ppm= is reached, there will be no deviation of >±1ppm, which meets the stability requirements of clinical applications.

Example 1.

When treating persistent pulmonary hypertension in newborns or congenital heart disease combined with pulmonary hypertension, the inlet end of the device is connected to the pressure reducing valve of the nitric oxide cylinder through the quick connection port 2, and the output end of the device is connected to the respiratory valve through the quick connection port 2. The gas supply circuit connection of the machine, the flow control button of the regulating device, the monitoring and control display instrument 6 shows the percentage flow rate, (such as: 20 represents the 20% flow rate of 200 ml/min for the full process), and the NO direction is opened and connected. After the ventilator is supplied with gas, continuous gas sampling is carried out at least 20 cm downstream of the access port, and the relative concentration of nitric oxide and nitrogen dioxide before entering the lungs is measured with an electrochemical nitric oxide and nitrogen dioxide concentration detector ( Unit ppm), according to the ventilator per minute ventilation and the NO concentration in the known steel cylinder, calculate the relative concentration value of the measured NO, to help preset the flow of the mass flow controller 8, and control the mass flow controller 8 of the actual flow, to achieve the purpose of controlling NO safe work. If the flow rate of the mass flow controller 8 cannot meet the actual needs, turn on the gas bypass switch 9, so that the mass flow controller 8 has no function of controlling the flow rate, but keep the gas circulation, and control a higher flow rate by adjusting the rotameter 4. Once the power supply of the ventilator fails, the change of the power supply current will cause the gas fast cut-off solenoid valve 5 to be closed, so as to avoid excessive NO gas entering the lungs and causing damage to the lungs.

Example 2.

It is used to diagnose pulmonary vascular function. When measuring pulmonary hemodynamic parameters, NO is inhaled through a face mask, and the NO flow rate is generally controlled within the range of 0-200 ml/min by using this device. The time is controlled for 5-10 minutes, and pulmonary artery pressure and pulmonary vascular resistance can be measured by invasive arterial catheter lateral pressure or Doppler color ultrasound.

Claims (2)

1. the nitrogenous gas mass flow control appts comprises fast interface (2), valve (3), spinner-type flowmeter (4), gas fast shut-off solenoid valve (5), monitoring, control display instrument (6), NO ₂Remover (7), mass flow controller (8), gas bypassing switch (9), gas flow alarm (10), stainless steel connecting pipe (11) is characterized in that: adopt stainless steel connecting pipe (11) fast interface (2), valve (3), spinner-type flowmeter (4), gas fast shut-off solenoid valve (5), NO ₂Remover (7), mass flow controller (8), gas flow alarm (10) are communicated with the air feed loop that constitutes under the normal need situation with lung ventilator; Adopt stainless steel connecting pipe (11) fast interface (2), valve (3), spinner-type flowmeter (4), gas fast shut-off solenoid valve (5), NO ₂Remover (7), gas bypassing switch (9), gas flow alarm (10) are communicated with the air feed loop of back formation to the big situation of the flow requirement of nitrogenous gas with lung ventilator.

2. device according to claim 1 is characterized in that: gas fast shut-off solenoid valve (5) is connected with the lung ventilator circuit by cable.

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