RU2524906C2 - Device for testing breathing apparatus - Google Patents

Abstract

FIELD: rescue equipment.

SUBSTANCE: device for testing the breathing apparatus comprises the gas-air mixture flow agitator of the dosing system of carbon dioxide and water, the measuring units of carbon dioxide and oxygen content, temperature, resistance to breathing and humidity, the carbon dioxide absorption unit. The novelty is production of the gas-air mixture flow agitator in the form of a container connected to the recirculation circuit of the working fluid, in which the sleeve of elastic material is placed, which cavity is connected to the test apparatus. The recirculation circuit of the working fluid comprises a pump and receivers connected to the container through the control valves, between which the differential transducers of pressure and flow are mounted. In front of the valve the temperature sensor and the measuring units of concentration of oxygen and carbon dioxide in the gas-air mixture are mounted. The device provides elimination of discharge of part of the gas-air mixture to the environment and reproduces the dynamics of human breathing, and also provides the ability of stepless regulation of depth of breathing during the breathing apparatus testing.

EFFECT: improved design.

6 cl, 2 dwg

Description

The invention relates to a device for testing breathing apparatus.

A device is known - a test bench for breathing apparatus, containing an actuator connected to a data transmission device simulating human breathing, made in the form of a piston pump, to the output channel of the working chamber of which a breathing apparatus is connected, in which there is a gearbox and a gas cylinder. The device comprises a system of sensors connected to data transmission means for controlling the testing process (German patent No. 19627388, IPC A62B 27/00, 1998).

The disadvantage of this device is the complexity of the design. In addition, the use of a piston pump is not optimal for testing.

A device for testing a breathing apparatus is known, comprising a flow meter of a gas-air mixture, a carbon dioxide and water dosing system, meters of carbon dioxide and oxygen, temperature, breathing resistance and humidity, a flow meter is a main bellows, diaphragm or piston type pump that generates a pulsating gas-air flow mixtures with a change in volumetric flow close to sinusoidal (GOST R 12.4.220-2001).

This device is characterized by the following disadvantages:

- the impossibility of reproducing the operation of the device without dumping part of the hot water supply to the environment;

- the impossibility of reproducing the operation of the device reproducing the dynamics of human respiration;

- the impossibility of stepless regulation of the depth of respiration during the operation of the device;

- the inability to reproduce various loads during operation of the device, which ultimately reduces the operational characteristics of the device for testing breathing apparatus.

The objective of the invention is to improve performance.

The technical result consists in creating a device that excludes the discharge of part of the gas-air mixture into the environment, as well as reproducing the dynamics of a person’s breathing and the possibility of stepless regulation of the depth of breathing during operation, providing the possibility of reproducing various loads during testing.

The problem is solved in that in a device for testing a breathing apparatus containing a gas-air mixture flow rate meter, a carbon dioxide and water dosing system, carbon dioxide and oxygen content meters, temperature, respiratory resistance and humidity, while the gas-air mixture rate stimulator is made in the form of a recirculation loop of the working medium of the container in which a sleeve of elastic material is placed, the cavity of which is connected with the device under test.

The recirculation loop of the working medium contains a pump and receivers connected to the tank through controlled valves, between which a differential pressure gauge is installed.

The air-gas mixture flow inducer is connected to the input of the tested device through the control valve and humidifier, and the outlet is connected to the carbon dioxide dosing line, the control valve and the flow inducer, forming a recirculation circuit of the gas-air mixture.

A temperature sensor and measuring instruments for the concentration of oxygen and carbon dioxide in the gas-air mixture are installed in front of the control valve.

After the control valve, a temperature sensor and oxygen and carbon dioxide concentration meters are installed.

Inside the sleeve of the inducer of the flow rate of the air-gas mixture, conical perforated inserts are installed.

The implementation of the flow rate inducer of the gas-air mixture in the form of a container connected to the recirculation circuit, in which a sleeve of elastic material is placed, the cavity of which is connected to the device under test, makes it easy to control the test modes of the breathing apparatus at minimum and maximum loads. This ensures the exclusion of the discharge of part of the gas-air mixture into the environment, as well as a stepless transition from minimum to maximum load, and vice versa, which corresponds to the actual conditions of use of the breathing apparatus. Unlike existing devices for testing devices, the transition from one load to another is carried out without stopping the operation of the device. The control of the valves of the working medium is easily amenable to automatic control, which increases the efficiency and accuracy of control.

The implementation of the recirculation loop of the working medium, consisting of a pump and receivers connected to the tank through controlled valves, between which a differential pressure gauge is installed, simplifies the design and control of the testing device and provides the ability to automate the control of the device.

The installation of a temperature sensor and oxygen and carbon dioxide concentration meters in the gas-air mixture before and after the control valve makes it possible to compare the characteristics of the gas-air mixture at the inlet and outlet of the test apparatus, which allows testing the breathing apparatus in accordance with existing regulatory documents.

The connection of the gas-air mixture flow inducer with the test apparatus inlet through the control valve and humidifier, and the output with the carbon dioxide dosing line, the control valve and the flow inducer, with the formation of the gas-air recirculation loop, ensures the gas exchange that occurs during human breathing by reducing the amount of oxygen in the simulator load, as well as an increase in the amount of carbon dioxide, and the flow of air-gas mixture with a given humidity and temperature, simulating her human breath.

The installation of a temperature meter and oxygen and carbon dioxide concentration meters after the valve provides a measurement of the temperature and content of carbon dioxide and oxygen at the outlet of the apparatus under test. If the carbon dioxide content is exceeded or the oxygen content decreases below the value determined by the nameplate characteristics of the apparatus, the test is terminated.

The installation of conical perforated inserts inside the sleeve of the flow inducer of the gas-air mixture eliminates the effect of “collapse” of the sleeve, which increases the reliability of the flow stimulator and the reliability of the device.

In the drawings:

figure 1 shows a diagram of a device; figure 2 shows the stimulator of the flow rate of the gas-air mixture.

The list of items indicated in the drawings:

1 - stimulator of the flow of air-gas mixture;

2 - carbon dioxide dosing system;

3 - water dosing system;

4 - meters of carbon dioxide content on inspiration;

5 - a meter of carbon dioxide on the exhale;

6 - measuring oxygen content on inspiration;

7 - a meter of oxygen content on the exhale;

8 - temperature meter;

9 - moisture meter;

10 - test breathing apparatus;

11 - block absorption of carbon dioxide;

12 - the electromagnetic valve;

13 - the electromagnetic valve;

14 - fitting;

15 - input fitting;

16 - output fitting

17 - the electromagnetic valve;

18 - receiver ;;

19 - pump;

20 - the electromagnetic valve;

21 - receiver

22 - differential pressure gauge;

23 - flow sensor;

24 - flow sensor;

25 - case;

26 - cover;

27 - cover

28 - annular protrusion.

29 - perforated cover;

30 - sleeve;

31 - a stimulator of an expense to gas analyzers.

A device for testing a breathing apparatus contains a gas-air mixture flow inducer 1, a carbon dioxide dosing system 2, which can be made in the form of a compressed gas cylinder, a reducer and a valve (not shown), a water dosing system 3 in the form of a container with a heater and a steam dosing valve , meters of carbon dioxide on inspiration 4 and expiration 5 in the form of a gas analyzer, oxygen content on inspiration 6 and expiration 7, temperature meters 8 in the form of a thermal converter with a secondary device, and a meter humidity 9 in the form of a hygrometer with electrical output. All these elements are connected to a recirculation circuit connected to the test isolating breathing apparatus 10. In addition, the recirculation circuit includes a carbon dioxide absorption unit 11, an electromagnetic valve 12 and an electromagnetic valve 13, between which the recirculation circuit is connected to the nozzle 14 of the flow rate inducer 1.

The hot water flow driver 1 at the top is equipped with fittings 15 and 16. The fitting 15 is connected through a valve 17 and a receiver 18 to a pump 19, which is connected to an electromagnetic valve 20 through a receiver 21. An differential pressure gauge 22 is installed between the fittings 15 and 16. Between the valve 17 and a receiver 18 has a flow sensor 23 installed, and between the receiver 21 and the valve 20 a flow sensor 24 is installed.

The gas-air mixture flow inducer 1 is made in the form of a housing 25 provided with covers 26 and 27. The covers on the inner surface are made with an annular protrusion 28 provided with a conical perforated cover 29, and a sleeve 30 made of an elastic material is fixed on these protrusions.

To feed the carbon dioxide 6 and oxygen 4 contents between the breathing apparatus 10 and the carbon dioxide absorption unit 11, a flow inducer is installed to the gas analyzers 31.

The device operates as follows.

When the pump 19 is turned on, the working medium enters the cavity of the flow driver 1, formed by the housing 25 and the sleeve 30, through the fitting 15 located on the cover 28. Under pressure, the sleeve 30 is deformed and the gas-air mixture from its cavity enters the recirculation loop through the electromagnetic valve 13, sequentially passing through a carbon dioxide metering system 2, a water metering system 3, a carbon dioxide meter 5, a moisture meter 9, a temperature meter 8, an expiratory oxygen meter 7. A gas carrier the ear mixture enters the test breathing apparatus 10, from it into the carbon dioxide absorption unit 11, through the valve 12 it returns through the fitting 14 located on the cover 27 into the cavity of the sleeve 30, when the valve 17 is closed and the valve 20 is opened, the air-gas mixture enters the inlet pump, due to the pressure drop in the housing 25, the sleeve returns to its original position, which corresponds to inhalation. When the valve 12 is opened, the DHW passes through the carbon dioxide absorption unit, and its composition is controlled by carbon dioxide 4 meters and an oxygen 6 meter supplied by the flow inducer 31. The volume of the working medium supplied by the pump 19 is numerically equal to the volume of the air-gas mixture both on inhalation and on the exhalation is controlled by flow sensors 23 and 24. The conical caps 29 located on the annular protrusion 28 prevent the collapse of the sleeve 30 upon exhalation, thereby increasing the reliability of the gas-air flow inducer Mesi 1.

Thus, by switching the valves 17 and 20, compression and expansion of the sleeve 30 occur, simulating the breathing process. When the solenoid valves 17 or 20 are locked, the pump does not turn off, but increases the pressure of the working medium in the receiver 18 and creates a discharge of the working medium in the receiver 21, which saves energy by choosing a pump with a lower capacity.

The pressure drop between the fittings 15 and 16 located on the cover 26 is measured by a differential pressure gauge 22 and corresponds to the breathing resistance of the breathing apparatus 10.

The device eliminates the discharge of part of the gas-air mixture into the environment and reproduces the dynamics of human breathing, and also provides the possibility of stepless regulation of the depth of breathing during the testing of breathing apparatus.

Claims (6)

1. A device for testing a breathing apparatus, comprising a gas-air mixture flow rate meter, a carbon dioxide and water dosing system, carbon dioxide and oxygen content meters, temperature, respiratory resistance and humidity, a carbon dioxide absorption unit, characterized in that the air-gas rate flow rate meter is made in in the form of a container connected to the recirculation loop of the working medium, in which a sleeve of elastic material is placed, the cavity of which is connected to the device under test. 2. The device according to claim 1, characterized in that the recirculation circuit of the working medium contains a pump and receivers connected to the tank through controlled valves, between which differential pressure and flow sensors are installed. 3. The device according to claim 2, characterized in that a temperature sensor and measuring instruments for the concentration of oxygen and carbon dioxide in the gas-air mixture are installed in front of the valve. 4. The device according to claim 1, characterized in that the gas-air mixture flow inducer is connected to the input of the device under test through the control valve and humidifier, and the outlet is connected to the carbon dioxide dosing line, the control valve and the flow inducer, forming a recirculation circuit of the gas-air mixture. 5. The device according to claim 4, characterized in that after the valve a temperature sensor and oxygen and carbon dioxide concentration meters are installed. 6. The device according to claim 1, characterized in that inside the sleeve of the inducer of the flow rate of the air-gas mixture, conical perforated inserts are installed.

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