WO2022075892A1

WO2022075892A1 - Universal mobile unit for supplying a continuous airflow

Info

Publication number: WO2022075892A1
Application number: PCT/RU2021/050372
Authority: WO
Inventors: Владимир Дмитриевич РОМАНОВ
Original assignee: Владимир Дмитриевич РОМАНОВ
Priority date: 2020-10-07
Filing date: 2021-11-10
Publication date: 2022-04-14
Also published as: IL299536A

Abstract

A universal mobile unit for supplying a continuous airflow is intended for testing personal respiratory protection equipment of the filtering variety in order to determine initial resistance to a continuous airflow in the case of articles having exhalation valves and to determine the efficacy thereof after exposure to a continuous airflow of up to 300 dm3/min. The technical result of the invention is that of providing improved operating characteristics, providing greater automation and reliability in the process of evaluating measured parameters, and creating a mobile device which has a relatively low weight and relatively small dimensions by comparison with the existing prior art, which can be connected to an electrical network and/or can be powered by an internal power source without the need for an electrical network, for generating a continuous airflow while also making it possible to automatically maintain the desired rate of the airflow at up to 300 dm3/min according to the resistance in the space under the mask, without requiring any additional technical equipment in the form of a compressed air line or an additional pump, which makes it possible to use the device for conducting testing and for solving research problems.

Description

Universal mobile unit for supplying constant air flow.

The field of technology to which the utility model belongs.

The universal mobile unit for supplying a constant air flow (hereinafter referred to as the device or utility model) is intended for testing personal respiratory protection equipment of a filtering type (hereinafter referred to as RPE), in terms of checking the initial resistance to a constant air flow of the front parts.

The device is designed to test the front parts of the RPE in order to determine the initial resistance to a constant air flow and for products with exhalation valves, to determine the performance after passing through a constant air flow of up to 300 dm ³ /min, in accordance with the prescribed regulatory documentation for these types of RPE.

The level of technology.

Interstate standard GOST EN 13274-3-2018 “System of labor safety standards. Personal respiratory protection. Test method Part 3. Determination of resistance to air flow "establishes a general method for determining the resistance to air flow of filters that are part of personal respiratory protection equipment (hereinafter referred to as RPE), and RPE equipped with a front part, with the exception of RPE for underwater work. Requirements and additional conditions for determining the airflow resistance of RPE or filters are given in the relevant product standards.

According to the specified GOST, there are two test methods:

When testing the first method, a test chamber is used in which a filter adapter is installed. The air flow from the appropriate stimulator is passed through the chamber and adapter with the filter installed. In this case, the pressure difference is measured inside the chamber and in the air flow leaving the chamber.

In the second test, airflow is passed through the filter adapter and the pressure difference between the ambient atmosphere and the point between the filter adapter and the airflow driver is measured.

The presented device solves both test methods

The present utility model is based on a typical scheme of sampling tubes of the mannequin head for determining the resistance to air flow, schematically shown in Fig. No. 1. "Typical drawing of sampling tubes of a dummy head for determining airflow resistance". At the same time, for this utility model, the general principle of the schematic arrangement of components and parts described in the diagram is taken as a basis.

Currently, a device manufactured by Monitoring LLC under the name MS-2 is known, designed to determine the resistance to a constant air flow of anti-gas, anti-aerosol, combined filters and front parts of RPE in accordance with GOST R 12.4.194-99, GOST R 12.4.251- 2009, GOST R 12.4.189-99, GOST R 12.4.190-99, GOST R 12.4.191-99 GOST R 12.4.192-99, harmonized with European EN 143, EN 14387, EN 136, EN 140, EN 149 and EN 405. This stand can be made in the form of a monoblock or structurally consist of a measuring unit and a constant air flow rate booster unit. AT the stand includes a mannequin head to determine the resistance of the front parts. The driver of the constant air flow is the compressed air line, which requires additional equipment that increases the weight and overall dimensions and narrows the range of conditions in which the device can be used. Also, the mentioned analogue of the device is uninformative and not convenient to use, in view of the mechanical control, and highly qualified personnel are required to work with it.

Known installation LLC "Metratex" to determine the initial resistance to air flow on exhalation and inhalation when testing half masks filtering for protection against aerosols MT 470 -potoku-na-vydokhe-i-vdokhe-pri-ispytaniyakh-polumasok-filtruiuschikh-dlya-zaschity-o), shown in Fig. No. 2. This setting determines the resistance to constant airflow at an exhalation flow of 160 dm ³ /min, at an inspiratory flow of 30 and 95 dm ³ /min. The disadvantage of this device is its narrow functionality in view of only three operating modes of the blowers (30, 95, 160 dm ³ /min), the need for a permanent connection to the power supply, as well as a pump to create a constant air flow, increasing the weight and overall dimensions, narrowing the range of conditions in which the device can be used. Also, the mentioned analogue of the device is uninformative and not convenient to use, and highly qualified personnel are required to work with it.

Also known is the "Respiratory Resistance Measurement Equipment" manufactured by INCPEC, shown in FIG. No. 3. In this analogue, the air flow supply mechanism is carried out by a pneumatic motor through a rotameter with a visual display of information (float) about the supplied air volume through PVC pipes, equipped with a digital pressure gauge placed in front of the filter. This device can be equipped with a dummy head, or check the filter without using a dummy head, by installing the filter on the nozzle. The described analogue has a number of disadvantages due to low automation and manual adjustment of the device for carrying out the necessary tests, it requires connection to the power supply network, the weight and overall dimensions of the installation are 75x50x50, the weight is 20 kg. without the mass of the mannequin head.

Clause 7.17.2. GOST 12.4.294-2015 provides for the procedure for testing filter masks for protection against aerosols for breathing resistance:

7.17.2.1 Filtering half masks with valves

Inhalation airflow resistance after dusting at a constant airflow rate of 95 dm ³ /min should not exceed:

- 400 Pa - for filtering half masks with FFP 1 valves;

- 500 Pa - for filtering half masks with FFP2 valves;

- 700 Pa - for filtering half masks with FFP3 valves.

Air flow resistance of filtering half masks with valves after dusting at the outlet should not exceed 300 Pa at a constant air flow rate of 160 dm ³ /min.

- 300 Pa - for filtering half masks without FFP1 valves;

- 400 Pa - for filtering half masks without FFP2 valves;

- 500 Pa - for filtering half masks without FFP3 valves.

^7.17.2.1 Filtering half-masks with valves - 400 Pa - for filtering half masks with FFP 1 valves;

- 500 Pa - for filtering half masks with FFP2 valves;

- 700 Pa - for filtering half masks with FFP3 valves. Air flow resistance of filtering half masks with valves after dusting at the outlet should not exceed 300 Pa at a constant air flow rate of 160 dm ³ /min.

Filtering half masks without valves

- 300 Pa - for filtering half masks without FFP1 valves;

- 400 Pa - for filtering half masks without FFP2 valves;

- 500 Pa - for filtering half masks without FFP3 valves.

Tests are carried out as follows:

The filtering half-mask is tightly put on the mannequin's head. Expiratory resistance is measured at the mouth of the manikin head using an adapter and a breathing machine set to 25 cycles/min and 2.0 dm ³ /stroke or a constant flow of 160 dm ³ /min. In this case, a pressure transducer is used.

This test procedure is similar to other test methods described in GOST, for example GOST EN 12942-2012, GOST 12.4.234-2012, GOST 12.4.235-2012.

The main indicators characterizing the properties of filtering RPE are:

- protection factor;

- penetration coefficient;

- suction coefficient;

- resistance to air flow;

- time of protective action;

- resistance to dust (for PPE intended for use in conditions of high dust content);

- volume fraction of carbon dioxide in the inhaled air;

- limitation of the area of the field of view in RPE;

- the mass that creates a load on the head.

The values of these indicators and test methods for them are established in the standards of general technical conditions for a specific type of RPE and their components. The values of indicators of RPE as a whole are ensured by compliance with the requirements established in the standards of general technical conditions for their components.

This utility model allows solving the technical problem of expanding the arsenal of technical means, greater device mobility due to smaller weight and size parameters, ease of use and automation of technological processes, by creating a device that automatically generates and maintains the necessary air flow, depending on the resistance in submask space, the reliability of the assessment of the measured parameters, and the creation of a mechanism for maintaining the required value, while simulating "inhalation" and "exhalation".

The task to which the utility model is directed is to create a device devoid of the above disadvantages, which is a highly mobile and automated installation capable of generating and maintaining an air flow at the maximum required speed, according to regulatory documentation - up to 300 dm ³ /min.

Automation of the process of testing filtering RPE significantly improves the quality and technical and economic efficiency of research work.

Process automation in the device provides: - increasing the efficiency and quality of scientific research on the basis of obtaining and clarifying phenomena or processes with the help of a computer;

- obtaining quantitatively new scientific results, the achievement of which is fundamentally impossible without the use of automation;

- reducing the time and labor intensity of the experimental cycle by accelerating the preparation and conduct of the experiment; increasing the efficiency of obtaining, processing and using information on quality and reliability; use of express analysis results; reducing the number of errors in measurement and processing;

- increasing the accuracy of the results of experimental data and their reliability;

- increasing the information content of the experiment by increasing the number of measuring channels, sensors and more complete data processing;

The technical result of the claimed utility model is to improve performance, increase the level of automation, the reliability of the assessment of the measured parameters, the creation of a mobile device with a relatively low weight, a relatively smaller overall size, compared with existing analogues, with the ability to connect to the electrical network and / or with the possibility of being powered from an internal power source, without the use of an electrical network, which generates a constant air flow and allows you to automatically maintain the required amount of air flow up to 300 dm ³ /min, depending on the resistance in the undermask space, which does not require additional technical devices, in the form of a line compressed air or an additional pump, which allows the device to be used for testing, as well as for solving research problems and developing new types of RPE.

Disclosure of the essence of the utility model

The technical result solved by the proposed utility model (device) is the creation of a universal and mobile device with a relatively low weight, a relatively small overall size, with the ability to connect to the electrical network and / or with the possibility of being powered from an internal power source (without using the mains), generating constant air flow and allowing to automatically maintain the required amount of air flow in a given direction (in the injection mode and in the air rarefaction mode), depending on the resistance in the undermask space, which does not require additional technical devices, in the form of a compressed air line or an additional pump, which allows using the device for testing, as well as for solving research problems and developing new types of RPE.

The utility model is a device consisting of a base with a connector for connecting a power supply and fittings for connecting a calibration pressure gauge, a pressure gauge, an inflatable head dummy with a mouth port and a pressure sensor fitting, a blower for inflating the head of a dummy, a control controller, a display, a suction and supply (bidirectional) blower, connecting elements and pipelines, differential pressure sensor, air flow volume flow meter, which are in functional unity.

The device can also be supplemented with an internal power supply, to expand the possible use cases, including the case where it is necessary to test the RPE with a constant air flow in places where there is no electrical connection. An inflatable head dummy with a mouthpiece and a pressure sensor fitting is located on the base of the device. The mannequin head is made of a solid base and coated with silicone. The head dummy is pumped with air in the space between the base and the silicone coating, by pumping it with a supercharger that has two valves - a check valve and a relief valve. The principle of pumping the mannequin head when you press the pear, air is pumped into the space between the base of the mannequin head and the silicone coating, while the check valve prevents the air from escaping back. Inflating the mannequin head is carried out to obturate the mask. For smooth descent, a relief valve is provided. The branch pipe of the mouth opening is located in the area of the mouth opening on the head mannequin, it is made of metal.

On the head manikin there is a pressure measurement sensor fitting to determine the resistance to air flow with a differential pressure sensor. Places for measuring pressure are located in the area under the mask space, for example: mouth, eye, or other location in the area covered by the mask.

The mouthpiece of the device can also be equipped with an adapter for attaching and further checking the filter cartridge. This add-on expands the range of functions for using the device.

The base of the device contains an internal power source, a connector for connecting a power supply unit and fittings for connecting a calibration pressure gauge - thrust pressure gauge, a seat for attaching an inflatable head dummy with a mouth port and a pressure sensor fitting, a control controller, a touch screen, suction and discharge (bidirectional) blowers, connecting elements and pipelines, air flow volume flow meter.

The suction and discharge (bidirectional) blower, connected by elements and pipelines, is located on the same base and is controlled by the controller through the blower driver, in order to be able to change the function of simulating "exhalation" and "inhalation", as well as the set airflow modes. In the "exhalation" simulation mode, the utility model supplies a constant air flow, with the help of a blower, into the mask space of the tested product (RPE) in the value necessary to achieve the required parameter. In the “inhale” mode, the device performs a vacuum in the undermask space, using a suction blower, of the product under test (RPE), forming a constant flow rate in the value necessary to achieve the required parameter. The maintenance and regulation of the flow rate is carried out automatically, according to the algorithm, where the air flow rate and resistance in the mask mode are continuously monitored and compared, if it is necessary to maintain a parameter of a certain value, the air flow rate is adjusted. During the tests, continuous measurement of resistance in the submask space is carried out with the transfer of information to the touch screen.

The control controller is a unit that manages, controls the units and processes of the device, and also allows you to automatically maintain the parameters necessary for testing.

The display is made in the form of a touch screen and allows you to set commands and control processes during RPE testing, as well as set the necessary test parameters. The touch screen displays data on the parameters of the ongoing check of the filter RPE.

During the tests, resistance is measured in the undermask space using a differential pressure sensor. To form the air flow, atmospheric air is used by taking it from the environment through the air intake channel. Accession of a product to the block is carried out by means of the head of a dummy.

The utility model is equipped with modern means of automation of technological processes. The unit is controlled by selecting commands on the touch screen. Automation tools allow you to automatically maintain test parameters (air flow rate).

Algorithm for maintaining test parameters:

Bi-directional blower generates air flow in a given direction - A volumetric air flow meter located in front of the bi-directional blower counts dm ³ /min. - a differential pressure sensor detects the resistance in the undermask space - the control controller calculates the speed of the air flow supplied into the undermask space - in the case of an air flow at a lower speed than the set one, the control controller instructs the blower to generate a higher air flow rate until the required air flow is reached parameter, as well as maintaining the received parameters.

In FIG. No. 4 "Schematic representation of the interaction of device blocks", the description of which is set out in the section "Brief description of the drawings".

The above diagram shows the interaction of the blocks and the schematic location of the sensors on the device.

The device is equipped with an external power supply connected to the mains.

The device allows you to measure the resistance to a constant air flow for testing RPE, in order to determine its protective properties,

For ease of use, expanding the range of conditions in which the device can be used (where there is no connection to electricity), as well as the arsenal of technical means, the device can also be additionally equipped with an internal power supply (battery).

In order to expand the arsenal of technical means, to expand the functionality of using this device, the device can be presented in its private version with a branch pipe of the mouth opening of which is equipped with an adapter for mounting and further checking the filter cartridge

Brief description of the drawings

Fig. No. 1 "Typical scheme of sampling tubes, mannequin head for determining the resistance to air flow, according to GOST EN 13274-3-2018" System of labor safety standards. Personal respiratory protection. Test method Part 3. Determination of resistance to air flow, which schematically shows: the head of a dummy indicating the location of the sampling system, the sampling scheme, the internal structure of the sampling tubes, and the cross-sectional view of the sampling tubes.

The figure uses the following symbols:

1 - mannequin head;

2 - exhaled air;

3 - sampling fitting;

4 - inhaled air;

5 - sampling system;

6 - means for measuring differential pressure;

Fig. No. 2 "Installation of LLC "Metrateks" for determining the initial resistance to air flow on exhalation and inhalation when testing half masks filtering for protection against aerosols MT 470" shows a photo of the installation of the manufacturer LLC "Metrateks" for determining the initial resistance air flow during exhalation and inhalation during testing of half masks filtering for protection against aerosols MT 470, a more detailed description of which is indicated on the manufacturer's website httDs://www.metrotex.ru/Droducts/ustanovka-dlya-ODredeleniya-nachalnogo-soprotiyleniya-vozdushnomu-potoku -na-vydokhe-i-vdokhe-pri-ispytaniyakh-polumasok-filtruiuschikh-dlya-zaschity-o. The photograph of the installation, which is an analogue, shows a base with a placed head for testing filtering RPE with a constant air flow and a pump for supplying a constant air flow.

Fig. No. 3 “INSPEC breathing resistance measurement equipment” A breathing machine from the manufacturer INSPEC was provided, where you can see the components of the device: an air motor, a rotameter with a visual display of information (a float, PVC tubes, a digital pressure gauge, a mount for a mannequin head or a RPE filter cartridge.

Fig. No. 4 "Schematic representation of the interaction of device blocks":

The interaction figure schematically shows the blocks of the device, where

1- Mannequin head;

2- Exhaled air;

3- Sampling fitting;

4- Inhaled air;

6- Means for measuring differential pressure;

7- Suction and discharge (bidirectional) blower;

8- Meter of the volume flow of the air flow;

9- Managing controller;

10- Inflatable part of the head;

11- Internal power supply;

12- Touch screen;

13- Oral outlet

14- Compressor.

The diagram shows that the control controller interacts with all blocks and sensors of the device.

The internal power supply interacts with the volumetric air flow meter, pressure sensors, the blower and the control controller, supplying the necessary energy charge for the operation of the above units.

Fig. No. 5 "Schematic representation of the blocks of the device."

The figure shows the device in its longitudinal section. The image schematically shows the blocks of the device, where

1 - Managing controller;

2- Bidirectional blower driver;

3- Bidirectional blower;

4- The pipeline from the bidirectional blower to the undermask space;

5- Mouth fitting;

6- Union of differential pressure sensor;

7- Touch display

Fig. No. 6 "Algorithm for the functioning of the device." The figure schematically shows the operation algorithm of the device, where f is the required air supply parameter.

Fig. No. 7 "Appearance of the assembled device." The external view of the device is illustrated, where the device is shown with two differential pressure fittings: nose, eye.

Fig. No. 8 "Appearance of the assembled device, inflated mannequin head." At the device, with a pumped-up mannequin head.

Fig. No. 9 "Weight-dimensional example of the implementation of the utility model, presented in the form of providing the largest weight-dimensional dimensions." Connecting elements, fittings, control controller, air flow resistance meter, air flow meter, adapters indicated in the table are taken into account in the calculation in the total weight of about 1 kg.

Fig. No. 10 Comparative analysis of the weight and overall dimensions of analogs and the utility model, presented in tabular form.

Fig. No.11 Blower range.

In the graph, the top line represents the range of the 14V DC blower, the bottom line represents the range of the 12V DC blower.

Implementation of the utility model

Structurally, the useful model looks like this:

The device is a mannequin head located on a base with a touch screen.

Description of the design of the device: the base is in the form of a body with a hole for the free passage of air flow during the generation of air flow. The following blocks are located at the base: a connector for connecting a power supply unit and a fitting for connecting a calibration pressure gauge, an inflatable head dummy with a mouth port and a pressure sensor fitting, a control controller with a blower control driver, a display, a suction and discharge (bidirectional) blower, connecting elements and pipelines, an airflow resistance meter, a volumetric airflow meter, a touch screen, a seat for attaching a mannequin head. The head of the mannequin is connected to the base with fasteners, inside the mannequin there is a single pipeline with a base in which a bidirectional blower is located. The head dummy is made of a solid base covered with a silicone coating, between which there is a pipeline with an outlet to the supercharger, which has two valves - a check valve and a relief valve. The principle of inflating the mannequin head when the blower button is pressed, air is pumped into the space between the base of the mannequin head and the silicone coating, while the check valve prevents the air from escaping back. For smooth descent of air, a relief valve is provided through the supercharger pipeline to the atmosphere. The branch pipe of the mouth opening is located in the area of the mouth opening on the head mannequin, it is made of metal. In the area of the submask space (nose, mouth, chin, eye, other place) there is a fitting of a differential pressure sensor.

On the mannequin head are sensors that measure the resistance to air flow. The sensor is located in the area under the mask space, at least one of the following: mouth, eye, or other location in the area covered by the mask. The appearance of the assembled device is shown in Fig. No. 7.

The device can also be supplemented with an internal power supply, to expand the possible use cases, including the case where it is necessary to test the RPE with a constant air flow in places where there is no electrical connection.

A schematic representation of the device blocks is shown in figure No. 5

The device works as follows: The control controller, depending on the entered RPE test parameters, gives a command to the blower. The blower, following the command of the control controller, supplies a constant air flow through the pipeline, inside which the air flow volume flow meter is located, releasing the air flow through the mouth opening pipe. Air is taken from the environment. On the head of the dummy is an airflow resistance measurement sensor, which determines the resistance in the undermask space.

How the device works:

- The principle of operation is to create a constant air flow with a given flow rate through the tested RPE in the "inhalation" and "exhalation" directions and to measure the air pressure difference between the surrounding atmosphere and the pressure in the RPE under the mask space (airflow resistance). Inspiratory/expiratory airflows are provided by a bi-directional blower.

- In the “exhalation” mode, the blower supplies air at a constant flow rate to the undermask space of the tested product with a given flow rate in dm ³ /min, necessary for testing. The air exits through the RPE into the surrounding atmosphere.

- In the “inspiration” mode, the blower provides a rarefaction in the undermask space of the tested product, forming a constant flow of air from the surrounding atmosphere through the RPE with a flow rate in dm ³ / mi, necessary for testing. The minus sign means that the air flow is directed inside the transducer, in the "inspiration" direction.

- Maintenance and regulation of the set values of the air flow rate is carried out automatically using the built-in flow meter and controller.

- The built-in pressure sensor measures the difference between the air pressure in the undermask space of the tested RPE and the environment (resistance to air flow).

- The choice of the operating mode (setting the task) of the utility model converter is carried out by the operator using the touch screen. The test parameters can be adapted to test requirements by setting a higher or lower air flow rate.

The operation algorithm of the device is schematically described in Fig. No. 6.

Examples of implementation of the present device:

The test is subjected to RPE - Chance -E,

According to the instructions for the RPE, it is put on the Device.

The mannequin is inflated until the moment of obturation.

GOST R 53261-2009

The air flow is simulated (imitation of "exhalation") in accordance with clause 4.1.6. GOST R5326261-2009, equal to 95 dm ³ / min., for 3 seconds. the required level of air flow is reached and the resistance to air flow is measured in accordance with GOST. The device shows on the touch screen a resistance value of 111 Pa

The test is subjected to RPE - GDZK -U

According to the instructions for the RPE, it is put on the Device.

The mannequin is inflated until the moment of obturation.

GOST R 53261-2009.

The air flow is simulated (imitation of "inspiration") in accordance with 4.1.6. GOST R 53261-2009 equal to 95 dm ³ / min., for 3 seconds. the required level of air flow is reached and the resistance to air flow is measured in accordance with GOST. The device shows on the touch screen a resistance value of 490 Pa.

The readings of the resistance measurement sensor in the undermask space, reflected on the display of the device, are an indicator of the achievement of the technical result

The appearance of the device with an inflated mannequin head is shown in Fig. No. 8.

The improvement in performance is in the faster receipt of the test result of RPE, due to the presented implementation of the utility model, tk. the course of the test is reflected on the display during the test, the high mobility of the device, due to its weight - no more than 4 kg, which, in comparison with the full set of known analogues, weighs more than 12 kg. much less, the possibility of using without an electrical network, which is not provided by known analogues.

An increase in the level of automation is achieved due to the possibility of issuing commands and obtaining results on the display, and embedded software that performs a number of necessary operations, the control controller.

The reliability of the assessment of the measured parameters is expressed in the reflection of the flow of exhaled air, controlled by the meter of the volume flow of the air flow, the reliability of which can also be confirmed by the pressure of the calibration pressure gauge. Checking RPE with air flow is possible for the operability of the exhalation valve when the air flow passes through it, for the initial resistance to the air flow during inhalation, for the resistance to air flow during inhalation after dusting. As can be seen from the GOST, the tested parameters are quite clearly expressed and the excess of any declared parameter may be the basis for classifying RPE as unacceptable for human use, which emphasizes the need for a reliable reflection of the RPE test progress. The use of an air flow volume flow meter, taking into account the data on the resistance in the mask space, received and processed by the control controller, allows you to maintain the air flow at the value necessary for testing, reliably reflecting the test process on the display.

An example of using a universal constant air supply unit is as follows:

The filtering mask of category 3 is subjected to the test in accordance with GOST 12.4.293-2015,

With a given value of the flow "on inspiration" 90 dm ³ /min, the resistance was 213.4 Pa, while the actual flow is reflected by the value - 90 dm ³ /min.

At a given flow value "on exhalation" of 160 dm ³ /min, the resistance was 97.9 Pa, while the actual flow is reflected by a value of 164 dm ³ /min.

It should be noted that the set value of the flow and the actual flow do not always match, which can be seen when generating the "expiratory" flow and the difference is 4 dm ³ /min.

Analyzing the data obtained with the requirements for this type of RPE, the resistance "on inspiration" is lower than the maximum value by 86.6 Pa; the “expiratory” resistance is lower than the maximum allowable value by 52.1 Pa., which indicates the possibility of breathing in the presented mask and the comfort of breathing in it for a person.

In the process of using a universal constant air flow unit, you can quickly observe the changes in values during testing, because. data such as the value of the given flow, the actual flow, the resistance are reflected, which are the main criteria for evaluating the progress of the tests, as well as the suitability for the use of RPE. In addition, the claimed utility model is registered on the measuring instrument.

The creation of a mobile device with a relatively low weight, a relatively smaller overall size, in comparison with existing analogues, with the ability to connect to the electrical network and / or with the possibility of power from an internal power source, without using the mains, is confirmed by the data shown in Fig. No. 9 and 10.

As can be seen from the table shown in Fig. No. 10, the weight and overall dimensions of the utility model are smaller than each of the known analogues.

The presented analogues do not have the possibility of autonomous operation without an electrical network.

The solution of research problems is achieved due to the possibility of using the device when testing filtering RPE for breathing resistance and air supply, new RPD, dusty RPD, RPD after operation and in other conditions, in order to determine the possibility of using this RPE by a person, as well as the comfort of its use for a person , which in turn will make it possible to select during the development of RPE the most suitable for the conditions of use, as well as RPE that perform their functions with the least resistance, for the comfort of human breathing in it.

The bi-directional blower is a blower whose partial form is an example of a blower with the following parameters:

Voltage: 14VDC;

Maximum pressure: 8 kPa;

Current at maximum pressure: 6.1 A;

Speed at maximum pressure: 22000 rpm;

Maximum air flow: 800 dm ³ /min;

Current at maximum air flow: 14 A;

Speed at maximum air flow: 22000 rpm;

Pairs of magnetic poles: 2 pairs of poles.

The need to create an air flow with a speed of 300 dm ³ /min is justified by the existing requirements for filtering RPE (and. 5.5.3 "The exhalation valve must remain operational after passing through it a constant air flow with a flow rate of 300 dm ³ / min for 10 s." GOST 12.4.300 -2015).

It is planned to check the RPE for the initial resistance on inspiration, where the maximum value of the resistance is 980 Pa at a flow rate of 95 dm ³ /min. Considering the performance of the blower shown, where the maximum performance of the blower is presented in graphical form in FIG. 11, where the lower line corresponds to the maximum operating range of the 12 V DC blower, the upper line corresponds to the maximum operating range of the 14 V DC blower.

980 Pa =100mm. water column, which on the graph (perpendicular) corresponds to 0.83 cm. 95dm ³ / min = 5.7 m ³ / hour. An air flow of 95 dm ³ /min can be maintained at a resistance of 7060 Pa, which significantly exceeds all known values of the tested RPE parameters.

300 dm ³ /min = 18 m ³ /h From the table above it follows that an air flow of 300 dm ³ /min can be maintained at a resistance of 1176 Pa, which significantly exceeds the known values of the checked parameters of RPE.

Claims

Device formula Universal constant airflow supply unit

1. The device "Universal constant air flow supply unit" is intended for testing personal respiratory protection filtering equipment with a constant air flow, consisting of a base with a connector for connecting a power supply unit and fittings for connecting a calibration pressure gauge-thrust pressure gauge, an inflatable head dummy with a mouth outlet and fitting of a pressure sensor, a control controller, a display, a suction and discharge (bidirectional) blower, connecting elements and pipelines, an air flow resistance meter, a volume flow meter of the air flow, consisting in functional unity, characterized in that the generation of the air flow is carried out by a bidirectional blower by intake air from the atmosphere, the control controller performs the functions of automatically maintaining the necessary parameters of vacuum and air flow, the display is made in the form of a touch screen, the device is equipped with about an external power supply;

2. The device according to claim 1, the mouthpiece of which is equipped with an adapter for mounting and checking the filter cartridge.

3. The device according to claim 1, equipped with an internal power supply.

4. The device according to claim 2, equipped with an internal power supply.