RU206156U1 - "Borey" universal mobile unit for continuous air flow - Google Patents

Abstract

The Borey universal mobile constant air flow supply unit (hereinafter referred to as Borey) is designed to test filter-type personal respiratory protection equipment (hereinafter referred to as the RPE), in terms of checking the initial resistance to the constant air flow of the front parts. in order to determine the initial resistance to constant air flow and for products with exhalation valves, to determine the performance after passing a constant air flow up to 300 dm3 / min., in accordance with the prescribed regulatory documentation for these types of RPE. Classes of filtering RPE (RPE elements) that can be tested using Borey, with the designation of the relevant standards are given in Table 1. Interstate standard GOST EN 13274-3-2018 “Occupational safety standards system. 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 protective equipment (hereinafter - RPE), and RPE equipped with a front part, with the exception of RPE for underwater work. Requirements and additional conditions for determining the resistance to air flow of RPE or filters are given in the relevant standards for products. According to the specified GOST, there are two test methods: When testing the first method, use a test chamber in which a filter adapter is installed. adapter with installed filter. The difference between the pressures inside the chamber and in the air flow leaving the chamber is measured. In the second test method, the air flow is passed through the filter adapter, and the pressure difference in the surrounding atmosphere and at the point between the filter adapter and the air flow stimulator is measured. The presented device solves both The present utility model is based on a typical diagram of the sampling tubes of the dummy head for determining the air flow resistance, schematically shown in figure 2. "Typical diagram of the sampling tubes of the dummy head for determining the air flow resistance." At the same time, for this utility model, the general principle of the schematic arrangement of units and parts described in the diagram is taken as a basis. Currently, there is a known device manufactured by Monitoring LLC under the name MS-2, designed to determine the resistance to a constant air flow of anti-gas, anti-aerosol, combined filters and face parts of the 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 executed as a monoblock or structurally consist of a measuring unit and a constant air flow rate driver. The stand includes a dummy head for determining the resistance of the front parts. The inducer of the constant air flow rate 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 not very informative and not convenient to use, in view of mechanical control, and also highly qualified personnel is required to work with it. The plant of Metratex LLC is known for determining the initial resistance to air flow during exhalation and inhalation when testing filtering half masks for protection against aerosols MT 470 ) depicted in figure 3. This setting determines the resistance to constant air flow at an expiratory flow rate of 160 dm3 / min, at an inspiratory flow rate of 30 and 95 dm3 / min. The disadvantage of this device is its narrow functionality in view of only three modes of operation of the blowers (30, 95, 160 dm3 / min), the need for a constant connection to the power supply network, as well as a pump to create a constant air flow that increases the weight and 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 also required to work with it. The device "Equipment for measuring breathing resistance" produced by the company with the trademark INCPEC, shown in figure 4, is also known. 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

Description

Technical field to which the utility model belongs

The Borey universal mobile constant air flow supply unit (hereinafter referred to as Borey or Utility Model) is intended for testing filter-type respiratory protection equipment (hereinafter referred to as RPE), in terms of checking the initial resistance to constant air flow of the front parts.

Borey devices are designed to check 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 a constant air flow up to 300 dm ³ / min., In accordance with the prescribed regulatory documentation for these types of RPE.

Classes of filtering RPE (RPE elements) that can be tested using Borey, with the designation of the corresponding standards, are given in Table 1.

State of the art

Interstate standard GOST EN 13274-3-2018 “Occupational safety standards system. 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 - RPE), and RPE, complete with a front part, with the exception of RPE for underwater work. Requirements and additional conditions for determining the resistance to air flow of RPE or filters are given in the relevant product standards.

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

For the first test, use a test chamber containing a filter adapter. The air flow from the appropriate booster is passed through the chamber and the adapter with the filter installed. In this case, the difference in pressure inside the chamber and in the air flow leaving the chamber is measured.

In the second test method, air is passed through the filter adapter and the pressure difference between the ambient atmosphere and the point between the filter adapter and the air inducer is measured.

The presented device solves both test methods.

This utility model is based on a typical diagram of the sampling tubes of the dummy head for determining the air flow resistance, schematically shown in figure 2. "Typical diagram of the sampling tubes of the dummy head for determining the air flow resistance". At the same time, for the present utility model, the general principle of the schematic arrangement of units and parts described in the diagram is taken as a basis.

Currently, there is a known device manufactured by Monitoring LLC under the name MS-2, designed to determine the resistance to constant air flow of gas mask, anti-aerosol, combined filters and face pieces 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. The stand includes a dummy head for determining the resistance of the front parts. The inducer of the constant air flow rate 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 mechanical control, and highly qualified personnel are also required to work with it.

Known installation Metratex LLC for determining the initial resistance to air flow on exhalation and inhalation during testing of filtering half masks for protection against aerosols MT 470 (https://www.metrotex.ru/products/ustanovka-dlya-opredeleniya-nachalnogo-soprotivleniya-vozdushnomu -potoku-na-vydokhe-i-vdokhe-pri-ispytaniyakh-polumasok-filtruiuschikh-dlya-zaschity-o) depicted in figure # 3.

This setting determines the resistance to constant air flow at an expiratory flow rate of 160 dm ³ / min, at an inspiratory flow rate of 30 and 95 dm ³ / min. The disadvantage of this device is its narrow functionality in view of only three modes of operation of the blowers (30, 95, 160 dm ³ / min), the need for a constant connection to the power supply network, as well as a pump to create a constant air flow, increasing the weight and 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 also required to work with it.

Also known is the device "Equipment for measuring breathing resistance" produced by the company with the trademark INCPEC, shown in figure 4. In this analogue, the air flow mechanism is carried out by a pneumatic motor through a rotameter with a visual display of information (float) about the supplied volume of air through PVC pipes, equipped with a digital pressure gauge placed in front of the filter. This device can be equipped with a head dummy, or check the filter without using a head dummy by installing the filter on the fitting. The described analogue has a number of disadvantages due to low automation and manual adjustment of the device for carrying out the necessary tests, requires connection to the power supply network, the mass-overall dimensions of the installation are 75x50x50, and the weight is 20 kg. without the mass of the mannequin head.

Section 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

Resistance to air flow during inhalation after dusting at a constant air flow rate of 95 dm ³ / min should not exceed

400 Pa - for filtering half masks with FFP1 valves;

500 Pa - for filtering half masks with FFP2 valves;

700 Pa - for filtering half masks with FFP3 valves.

The 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.

Resistance to air flow during inhalation after dusting at a constant air flow rate of 95 dm ³ / min should not exceed

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 Resistance to air flow during inhalation after dusting at a constant air flow rate of 95 dm ³ / min should not exceed:

400 Pa - for filtering half masks with FFP1 valves;

500 Pa - for filtering half masks with FFP2 valves;

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

Filter half masks without valves

Resistance to air flow during inhalation after dusting at a constant air flow rate of 95 dm ³ / min should not exceed:

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.

The tests are carried out as follows:

The filtering half-mask is tightly put on the head of the mannequin. The expiratory resistance is measured at the mouth opening of the head of the manikin using an adapter and a breathing machine with a set operating mode of 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 described test methods described in GOST, for example GOST EN 12942-2012, GOST 12.4.234-2012, GOST 12.4.235-2012.

This utility model allows to solve the technical problem of expanding the arsenal of technical means, greater mobility of the device due to smaller mass-dimensional 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 under the mask 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 aforementioned 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 documents - up to 300 dm ³ / min.

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

Automation of processes in the Northwind device provides

increasing the efficiency and quality of scientific research based on the receipt and refinement of phenomena or processes by means of a computer;

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

shortening the time and reducing the complexity of the experimental cycle by accelerating the preparation and conduct of the experiment; increasing the efficiency of receiving, processing and using information on quality and reliability; using the results of express analysis; reducing the number of errors during measurement and processing;

increasing the accuracy of experimental data results 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 the operational characteristics, 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 comparatively smaller overall size in comparison with existing analogs, with the ability to connect to the electrical network and / or the possibility of power supply from an internal power source, without the use of an electrical network, generating a constant air flow and allowing in automatic mode to maintain the required air flow rate up to 300 dm ³ / min, depending on the resistance in the mask space, which does not require additional technical devices, in the form of a compressed line air or an additional pump, which makes it possible to use the Borey device for testing, as well as for solving research problems and problems of developing new types of RPE.

Disclosure of the essence of the utility model

The technical result solved by the proposed utility model (Borey 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 an electrical network and / or with the possibility of power supply from an internal power source (without using the electrical network) generating a constant air flow and allowing in automatic mode to maintain the required amount of air flow in a given direction (in the injection mode and in the vacuum mode), depending on the resistance in the mask space, which does not require additional technical devices, in the form of a compressed air line or additional pump, which makes it possible to use the Borey device for testing, as well as for solving research problems and problems of developing new types of RPE.

Borey is a device consisting of a base with a connector for connecting a power supply and fittings for connecting a calibration pressure gauge, an inflated head manikin with a mouth opening and a pressure sensor connection, a blower, for inflating the manikin head, control controller, display, suction and delivery (bi-directional) blower, connecting elements and piping, differential pressure sensor, volumetric air flow meter, all in functional unity.

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

An inflated head manikin with mouth opening and pressure sensor connection is located on the base of the device. The head mannequin is made of a solid base and covered with silicone. Air pumping of the head mannequin is carried out in the space between the base and the silicone coating, by pumping with a blower having two valves - a check valve and a relief valve. The principle of pumping the head of the dummy when pressing the bulb, air is pumped into the space between the base of the head of the dummy and the silicone coating, while the check valve does not allow air to come out. The mannequin's head is inflated to obturate the mask. A dump valve is provided for a smooth descent. The mouth opening is located in the mouth opening area on the head mannequin and is made of metal.

On the head mannequin there is a pressure sensor connection for determining the resistance to air flow with a differential pressure sensor. Pressure measurement points are located in the area of the mask space, for example: mouth, eye, or another location in the area covered by the mask.

The branch pipe of the mouth opening of the Borey device can also be equipped with an adapter for attaching and further checking the filter cartridge. This addition expands the range of functions for using the device.

The base of the device contains an internal power supply, a connector for connecting a power supply and fittings for connecting a calibration pressure gauge-draft gauge, a seat for attaching an inflated head mannequin with a mouth opening and a pressure sensor fitting, a control controller, a touch display, suction and delivery (bidirectional) blowers, connecting elements and pipelines, volumetric air flow meter.

The suction and delivery (bi-directional) blower connected by elements and pipelines is located on the same base and controlled by the controller through the blower driver, for the possibility of changing the function of simulating "exhalation" and "inhalation", as well as the set air flow modes. In the "exhalation" simulation mode, Borey delivers a constant air flow, using an injection blower, into the under-mask space of the test item (RPE) in the value necessary to achieve the required parameter. In the "inhale" mode, Borey carries out a vacuum in the mask space, with the help of a suction blower, of the tested product (RPE), forming a constant flow rate in the value necessary to achieve the required parameter. Maintaining and regulating the flow rate is carried out in automatic mode, according to an algorithm where the air flow rate and resistance are continuously monitored and compared in the under mask mode, if it is necessary to maintain a parameter of a certain value, the air flow rate is adjusted. During the tests, the resistance is continuously measured in the sub-mask space with the transfer of information to the touch display.

Control controller - a unit that controls, controls the units and processes of the device, and also allows automatic maintenance of the parameters required for testing.

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

During the tests, the resistance is measured in the under-mask 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. The attachment of the product to the unit is carried out using the head of the mannequin.

Borey 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 the test parameters (air flow rate).

Algorithm for maintaining test parameters:

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

In figure No. 5 "Schematic representation of the interaction of the device blocks", the description of which is set forth in the section "Brief description of the drawings".

The above diagram shows the block interactions and the schematic arrangement of the sensors on the device.

The device is equipped with an external power supply unit that connects to the mains.

The Borey device allows you to measure the resistance to constant air flow for testing the 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 an 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 fastening and further checking the filter cartridge

Brief Description of Drawings

Figure №1 Table of classes of filtering RPE (RPE elements) that can be tested using the Borey device, with the designation of the corresponding standards.

Column 1 shows the numbers in order, in line 2 Name of the class of RPE (clause TR CU 2011), in column 3 the designations of the standard are given.

Figure №2 "Typical scheme of sampling tubes, dummy head for determining the resistance to air flow, according to GOST EN 13274-3-2018" Occupational safety standards system. Personal respiratory protection. Test method Part 3. Determination of resistance to air flow ", which schematically shows: the head of the dummy indicating the location of the sampling system, the sampling scheme, the internal structure of the sampling tubes, as well as the view of the sampling tubes in cross-section.

The figure uses the following notation:

1 - mannequin head;

2 - exhaled air;

3 - sampling fitting;

4 - inhaled air;

5 - sampling system;

6 - means for measuring differential pressure;

7 - adjustable crimp clamp.

Figure No. 3 "Installation of Metratex LLC for determining the initial resistance to air flow during exhalation and inhalation during testing of filtering half masks for protection against aerosols MT 470" shows a photo of the installation by Metratex LLC for determining the initial resistance to air flow during exhalation and inhalation during tests filter half masks for protection against aerosols MT 470, a more detailed description of which is indicated on the website https://www.metrotex.ru/products/ustanovka-dlya-opredeleniya-nachalnogo-soprotivleniya-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.

Figure 4 "Equipment for measuring INSPEC breathing resistance" Provided a breathing machine manufactured by INSPEC, where you can see the constituent units of the device: an air motor, a rotameter with a visual display of information (float, PVC tubes, digital pressure gauge, mount for a head mannequin or a filter cartridge for RPE.

Figure 5 "Schematic representation of the interaction of device blocks":

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

Mannequin head;

Exhaled air;

Sampling fitting;

Inhaled air;

Differential pressure measuring device, one of which measures the pressure in the mask space, the other the pressure in the environment;

Suction and delivery (bi-directional) blower;

Air volumetric flow meter;

Controlling controller;

Inflatable head part;

Internal power supply;

Touchscreen;

Oral opening

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, blower and control controller, supplying the necessary energy charge for the operation of the above units.

Figure 6 "Schematic representation of the blocks of the Northwind device."

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

Controlling controller;

Bi-directional blower driver;

Bi-directional blower;

Pipeline from the bi-directional blower to the mask space;

Mouth opening;

Differential pressure sensor fitting;

Touchscreen

Figure №7 "Algorithm of the device functioning". The figure schematically shows the operation algorithm of the device, where f is the required parameter of air supply.

Figure №8 "External view of the Northwind device assembled". The external view of the Borey device is illustrated, where Borey is depicted with two differential pressure fittings: nose, eye.

Figure 9 "Exterior view of the Boreas device assembled, inflated head mannequin." Boreas device, with a pumped-up mannequin head.

Implementation of the utility model

The design of the Northwind device is as follows:

The Boreas device is a mannequin head located on a touchscreen base.

Description of the design of the device: a base in the form of a body with an opening for free passage of air flow when generating an air flow. The following blocks are located at the base: a connector for connecting a power supply and a connector for connecting a calibrating pressure gauge, an inflated head mannequin with a mouth opening and a pressure sensor connector, a control controller with a driver for controlling a blower, a display, a suction and delivery (bi-directional) blower, connecting elements and pipelines, an air flow resistance meter, an air volume flow meter, a touch display, a seat for attaching a head mannequin. The head of the dummy is connected to the base by fasteners, a single pipeline passes inside the dummy with the base, in which a bi-directional blower is located, the pipeline turns in the direction and connects to the mouth opening to transfer the generated air flow to the undermask space. The dummy head is made of a solid base covered with a silicone coating, between which there is a pipeline with an outlet to the blower, which has two valves - a check valve and a relief valve. The principle of dummy head pumping When you press the blower button, air is pumped into the space between the base of the dummy head and the silicone cover, while the check valve does not allow air to come out. For a smooth release of air, a relief valve is provided through the blower pipeline to the atmosphere. The mouth opening is located in the mouth opening area on the head mannequin and is made of metal. In the area of the undermask space (nose, mouth, chin, eye, other place) there is a fitting for a differential pressure sensor.

On the head mannequin there are sensors that measure the resistance to air flow. The sensor is located in the area under the mask space: mouth, eye, or another location in the area covered by the mask. The external view of the Northwind device assembled is shown in Fig. No. 8.

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

The branch pipe of the mouth opening of the Borey device can also be equipped with an adapter for attaching and further checking the filter cartridge. This addition expands the range of functions for using the device.

A schematic representation of the design of the Borey device is shown in figure No. 6

Boreas works as follows:

The control controller, depending on the entered test parameters of the RPE, gives a command to the blower. The supply blower, following the command of the control controller, supplies a constant air flow through the pipeline, inside which the volumetric flow rate of the air flow is located, releasing the air flow through the branch pipe of the mouth opening. Air is taken from the environment. On the head of the dummy, there is a sensor for measuring the resistance to air flow, which determines the resistance in the mask space.

The principle of operation of the Northwind device:

The principle of operation consists in creating a constant air flow with a given flow rate through the tested RPE in the directions of "inhalation" and "exhalation" and measuring the difference in air pressure between the surrounding atmosphere and the pressure in the mask space of the RPE (air flow resistance). Inspiratory / expiratory air flows are provided by a bi-directional blower.

In the "exhalation" mode, the blower supplies air at a constant flow rate into the undermask space of the test item at a given flow rate in dm ³ / min required for the test. Air escapes through the RPE into the surrounding atmosphere.

In the "inhalation" mode, the blower provides a vacuum in the undermask space of the test item, forming a constant air flow from the surrounding atmosphere through the RPE with a flow rate in dm ³ / mi required for the test. A minus sign means that the air flow is directed towards the inside of the transducer, in the "inhalation" direction.

Maintaining and regulating the set values of the air flow rate is carried out in automatic mode 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 Borey transducer is carried out by the operator using the touch screen. Test parameters can be adapted to test requirements by setting higher or lower air flow rates.

The operation algorithm of the device is schematically described in figure 7.

Examples of the implementation of this 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 to the point of obturation.

GOST R 53261-2009

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

The RPE - GDZK -U is undergoing testing

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

The mannequin is inflated to the point of obturation.

GOST R 53261-2009

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

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

The appearance of the Borey device with an inflated head dummy is shown in figure 9.

Claims (4)

1. Universal constant air flow supply unit, designed for testing filtering personal protective equipment for respiratory protection with constant air flow, consisting of a base with a connector for connecting a power supply and fittings for connecting a verification pressure gauge, an inflated head manikin with a mouth opening and a pressure sensor connection, a control controller, a display, a suction and pressure (bi-directional) blower, connecting elements and pipelines, an air flow resistance meter, an air volume flow meter, consisting in a functional unity, characterized in that the air flow is generated by a bi-directional blower by drawing air from the atmosphere, the control controller performs the functions of automatically maintaining the required parameters of discharge and air flow, the display is made in the form of a touch screen, the device is equipped with an external power supply. 2. A universal constant air flow supply unit according to claim 1, characterized in that the mouth opening is equipped with an adapter for fastening and checking the filter cartridge. 3. A universal constant air flow supply unit according to claim 1, characterized in that it is equipped with an internal power supply unit. 4. A universal constant air flow supply unit according to claim 2, characterized in that it is equipped with an internal power supply unit.

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