Universal mobile unit for supplying a continuous airflow

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

[0001] Description

[0002] Universal mobile unit for supplying constant air flow.

[0003] The field of technology to which the utility model belongs.

[0004] The universal mobile unit for supplying constant air flow (hereinafter referred to as the device or utility model) is intended for testing filter-type personal respiratory protective equipment (hereinafter referred to as PPE), in terms of checking the initial resistance of the face parts to constant air flow.

[0005] The device is designed to test the face parts of personal protective equipment (PPE) to determine the initial resistance to a constant air flow and, for products with exhalation valves, to determine the operability after passing a constant air flow of up to 300 dm3. 3 / min., in accordance with the regulatory documentation provided for these types of personal protective equipment.

[0006] State of the art.

[0007] The interstate standard GOST EN 13274-3-2018 "Occupational Safety Standards System. Personal Respiratory Protective Equipment. Test Method. Part 3. Determination of Airflow Resistance" establishes a general method for determining the airflow resistance of filters included in personal respiratory protective equipment (PRE) and PRE equipped with a facepiece, with the exception of PRE for underwater work. Requirements and additional conditions for determining the airflow resistance of PRE or filters are provided in the relevant product standards.

[0008] According to the specified GOST, there are two testing methods:

[0009] The first method uses a test chamber with a filter adapter installed. Airflow from the appropriate inducer is passed through the chamber and the adapter with the filter installed. The pressure difference between the chamber and the airflow exiting the chamber is measured.

[0010] In the second test method, the air flow is passed through the filter adapter, and the pressure difference between the surrounding atmosphere and the point between the filter adapter and the air flow inducer is measured.

[0011] The presented device solves both testing methods

[0012] This utility model is based on a typical diagram of sampling tubes for a mannequin head used to determine airflow resistance, schematically depicted in Fig. 1. "Typical Diagram of Sampling Tubes for a Mannequin Head Used to Determine Airflow Resistance." This utility model is based on the general principle of the schematic arrangement of the components and parts described in the diagram.

[0013] Currently, a device produced by Monitoring LLC is known under the name MS-2, designed to determine the resistance to a constant air flow of gas masks, anti-aerosol, combined filters and face 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 block for stimulating the flow of constant air flow. The rig includes a mannequin head for determining facial resistance. A compressed air line drives the constant air flow, requiring additional equipment that increases the device's weight and dimensions and limits the range of conditions in which it can be used.Also, the mentioned analog of the device is uninformative and inconvenient to use, due to mechanical control, and highly qualified personnel are required to operate it.

[0014] The installation of OOO Metratex for determining the initial resistance to air flow during exhalation and inhalation during testing of filtering half masks for protection against MT 470 aerosols is known (https: / / www.metrotex.ru / products / ustanovka-dlya-opredeleniya- nachalnogo-soprotivleniya-vozdushnomu-potoku-na-vydokhe-i-vdokhe-pri-ispytaniyakh- polumasok-filtruiuschikh-dlya-zaschity-o), shown in Fig. No. 2. This installation determines the resistance to a constant air flow at an exhalation flow rate of 160 dm 3 / min, with a flow rate during inhalation of 30 and 95 dm 3 / min. The disadvantage of this device is its limited functionality due to only three operating modes of the blowers (30, 95, 160 dm 3 / min), the need for a constant power supply and a pump to create a constant air flow, which increases the device's weight and dimensions, limiting the range of conditions in which it can be used. Furthermore, the aforementioned device lacks information and is inconvenient to use, requiring highly qualified personnel to operate it.

[0015] Another device known as "Breathing Resistance Measuring Equipment" is manufactured by a company with the trademark INCPEC and is shown in Fig. 3. In this device, the air flow is delivered by a pneumatic motor through a rotameter with a visual display (float) of the air volume delivered through PVC tubing, equipped with a digital pressure gauge placed in front of the filter. This device can be equipped with a dummy head, or the filter can be tested without a dummy head by attaching the filter to the nozzle. This device has several drawbacks due to its limited automation and manual configuration for performing the necessary tests. It requires a power supply. The overall dimensions of the device are 75 x 50 x 50 cm, and it weighs 20 kg, excluding the dummy head.

[0016] Clause 7.17.2. GOST 12.4.294-2015 provides the procedure for testing filter masks for protection against aerosols for breathing resistance:

[0017] 7.17.2.1 Filtering half masks with valves

[0018] Air flow resistance during inhalation after dusting at a constant air flow rate of 95 dm3 3 / min should not exceed:

[0019] - 400 Pa - for filtering half masks with FFP 1 valves;

[0020] - 500 Pa - for filtering half masks with FFP2 valves;

[0021] - 700 Pa - for filtering half masks with FFP3 valves.

[0022] 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 dm3. 3 / min.

[0023] Air flow resistance during inhalation after dusting at a constant air flow rate of 95 dm3 3 / min should not exceed:

[0024] - 300 Pa - for filtering half masks without FFP1 valves;

[0025] - 400 Pa - for filtering half masks without FFP2 valves;

[0026] - 500 Pa - for filtering half masks without FFP3 valves.

[0027] 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 dm3 3 / min should not exceed: - 400 Pa - for filtering half masks with FFP 1 valves;

[0028] - 500 Pa - for filtering half masks with FFP2 valves;

[0029] - 700 Pa - for filtering half masks with FFP3 valves. The airflow resistance of filtering half masks with valves after dust loading at the outlet should not exceed 300 Pa at a constant airflow rate of 160 dm3. 3 / min.

[0030] Filtering half masks without valves

[0031] Air flow resistance during inhalation after dusting at a constant air flow rate of 95 dm3 3 / min should not exceed:

[0032] - 300 Pa - for filtering half masks without FFP1 valves;

[0033] - 400 Pa - for filtering half masks without FFP2 valves;

[0034] - 500 Pa - for filtering half masks without FFP3 valves.

[0035] The tests are carried out as follows:

[0036] The filtering half mask is placed tightly on the mannequin's head. Exhalation resistance is measured at the mannequin's mouth using an adapter and a breathing machine set to 25 cycles / min and 2.0 dm3. 3 / stroke or constant flow 160 dm 3 / min. A pressure transducer is used for this.

[0037] 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.

[0038] The main indicators characterizing the properties of filtering respiratory protective equipment are:

[0039] - protection factor;

[0040] - penetration coefficient;

[0041] - suction coefficient;

[0042] - air flow resistance;

[0043] - time of protective action;

[0044] - resistance to dust (for personal protective equipment intended for use in highly dusty conditions);

[0045] - volume fraction of carbon dioxide in inhaled air;

[0046] - limitation of the field of vision in the personal protective equipment;

[0047] - mass that creates a load on the head.

[0048] The values ​​of these indicators and the testing methods for them are established in the general technical specifications for specific types of RPE and their components. The values ​​of RPE indicators are generally ensured by compliance with the requirements established in the general technical specifications for their components.

[0049] This utility model allows for solving the technical problem of expanding the arsenal of technical means, increasing the mobility of the device due to smaller weight and dimensions, ease of use, and automation of technological processes, by creating a device that allows for the automatic generation and maintenance of the required air flow, depending on the resistance in the sub-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".

[0050] The objective of the utility model is to create a device free from the above mentioned 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 dm3. 3 / min.

[0051] Automation of the testing process for filtering respiratory protective equipment significantly improves the quality and technical and economic efficiency of research work.

[0052] Automation of processes in the device ensures: - increasing the efficiency and quality of scientific research based on obtaining and refining phenomena or processes using a computer;

[0053] - obtaining quantitatively new scientific results, the achievement of which is fundamentally impossible without the use of automation;

[0054] - reduction of the timeframe 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; using the results of express analysis; reducing the number of errors in measurement and processing;

[0055] - increasing the accuracy of experimental data results and their reliability;

[0056] - increasing the information content of the experiment by increasing the number of measuring channels, sensors and more complete data processing;

[0057] The technical result of the claimed utility model consists in improving operational characteristics, increasing the level of automation, the reliability of the assessment of the measured parameters, creating a mobile device that has a relatively low weight, a relatively smaller overall size, compared to existing analogs, with the ability to connect to an electrical network and / or with the ability to power from an internal power source, without using an electrical network, generating a constant air flow and allowing you to automatically maintain the required air flow of up to 300 dm 3 / min, depending on the resistance in the sub-mask space, which does not require additional technical devices, such as a compressed air line 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 PPE.

[0058] Disclosure of the essence of the utility model

[0059] The technical result solved by the proposed utility model (device) is the creation of a universal and mobile device, which has a comparatively low weight, comparatively small overall dimensions, with the ability to be connected to an electrical network and / or with the ability to be powered from an internal power source (without using an electrical network), generating a constant air flow and allowing the required air flow value to be maintained in an automatic mode in a given direction (in the air pumping mode and in the air rarefaction mode), depending on the resistance in the sub-mask space, not requiring additional technical devices, in the form of a compressed air line or an additional pump, which allows the device to be used for testing, as well as for solving research problems and problems of developing new types of RPE.

[0060] The utility model is a device consisting of a base with a connector for connecting a power supply unit and fittings for connecting a verification pressure gauge-draft pressure gauge, an inflatable dummy head with a mouth opening pipe and a pressure sensor fitting, a blower for inflating the dummy head, a control controller, a display, a suction and blower (bidirectional) air blower, connecting elements and pipelines, a differential pressure sensor, and an air flow meter, all of which are functionally integrated.

[0061] The device can also be equipped with an internal power source to expand its potential use cases, including testing RPE under constant airflow in locations without a power supply. An inflatable dummy head with an oral inlet and pressure sensor connection is located on the base of the device. The dummy head is made of a rigid base and coated with silicone. The dummy head is inflated by a pump with two valves—a check valve and a relief valve. Pressing the bulb forces air into the space between the base of the dummy head and the silicone coating, while a relief valve prevents air from escaping. The dummy head is inflated to seal the mask. A relief valve is provided for smooth release.The mouth opening pipe is located in the mouth opening area of ​​the head mannequin and is made of metal.

[0062] A pressure sensor connection is located on the head mannequin to measure airflow resistance using a differential pressure sensor. Pressure measurement points are located within the mask space, such as the mouth, eye, or other area covered by the mask.

[0063] The device's mouthpiece can also be equipped with an adapter for attaching and subsequently testing the filter cartridge. This addition expands the device's range of functions.

[0064] The base of the device contains an internal power source, a connector for connecting the power supply unit and fittings for connecting a verification pressure gauge - draft and pressure meter, a seat for attaching an inflatable head dummy with a mouth opening pipe and a pressure sensor fitting, a control controller, a touch screen, a suction and discharge (bidirectional) air blower, connecting elements and pipelines, and an air flow meter.

[0065] A suction and pressure (bidirectional) air blower, connected by elements and piping, is located on a single base and controlled by a controller via a blower driver, enabling the ability to alternate between "exhalation" and "inhalation" simulations, as well as preset airflow modes. In the "exhalation" simulation mode, the utility model delivers a constant airflow, via the pressure blower, into the sub-mask space of the RPE at a value necessary to achieve the desired parameter. In the "inhalation" mode, the device creates a vacuum in the sub-mask space of the RPE using the suction blower, generating a constant flow rate necessary to achieve the desired parameter.Airflow is maintained and regulated automatically using an algorithm that continuously monitors and compares airflow and resistance in mask mode. If necessary, the airflow is adjusted to maintain a specific value. During testing, resistance in the mask space is continuously measured, and the information is transmitted to the touchscreen.

[0066] The control controller is a unit that manages and controls the units and processes of the device, and also allows for the automatic maintenance of the parameters required for testing.

[0067] The touchscreen display allows for entering commands and managing processes during RPE testing, as well as setting the required test parameters. The touchscreen displays data on the parameters of the filtering RPE being tested.

[0068] During testing, resistance in the under-mask space is measured using a differential pressure sensor. Atmospheric air is used to generate the air flow, drawn from the surrounding environment through an air intake duct. The device is connected to the unit via a mannequin head.

[0069] The utility model is equipped with modern process automation tools. The unit is controlled by selecting commands on a touchscreen display. The automation tools allow for automatic maintenance of test parameters (air flow rate).

[0070] Algorithm for maintaining test parameters:

[0071] A bi-directional blower generates air flow in a given direction - A volumetric air flow meter located in front of the bi-directional blower counts the dm 3 / min. of supplied air - the differential pressure sensor determines the resistance in the sub-mask space - the control controller calculates the speed of the air flow supplied to the sub-mask space - if the air flow is supplied at a lower speed than the set one, the control controller commands the blower to generate a higher air flow speed until the required parameter is reached, and also to maintain the obtained parameters.

[0072] Fig. No. 4 “Schematic representation of the interaction of the device blocks”, the description of which is set out in the section “Brief description of the drawings”.

[0073] The above diagram shows the interactions of the blocks and the schematic arrangement of the sensors on the device.

[0074] The device is equipped with an external power supply that connects to the mains.

[0075] The device allows measuring the resistance to constant air flow for testing respiratory protective equipment in order to determine its protective properties,

[0076] For ease of use, expansion of 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).

[0077] In order to expand the arsenal of technical means, to expand the functionality of using this device, the device can be presented in its specific version with a mouth opening pipe equipped with an adapter for fastening and further testing of the filter cartridge

[0078] Brief description of the drawings

[0079] Fig. No. 1 "Typical diagram of sampling tubes, dummy head for determining air flow resistance, according to GOST EN 13274-3-2018 "Occupational safety standards system. Personal respiratory protective equipment. Test method Part 3. Determination of air flow resistance", which schematically depicts: the dummy head with an indication of the location of the sampling system, the sampling diagram, the internal structure of the sampling tubes, as well as a cross-sectional view of the sampling tubes.

[0080] The following symbols are used in the figure:

[0081] 1 - mannequin head;

[0082] 2 - exhaled air;

[0083] 3 - sampling nozzle;

[0084] 4 - inhaled air;

[0085] 5 - sampling system;

[0086] 6 - differential pressure measuring device;

[0087] Fig. No. 2 "The setup of OOO Metratex for determining the initial resistance to air flow during exhalation and inhalation during testing of filtering half masks for protection against MT 470 aerosols" shows a photo of the setup of the manufacturer OOO Metratex for determining the initial resistance to air flow during exhalation and inhalation during testing of filtering half masks for protection against MT 470 aerosols, 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 setup, which is analogous, shows a base with a head placed on it for testing filtering RPE with a constant air flow and a pump for supplying a constant air flow.

[0088] Fig. No. 3 "INSPEC breathing resistance measuring equipment" A breathing machine from the manufacturer INSPEC is provided, where you can see the component units of the device: a pneumatic motor, a rotameter with a visual display of information (float, PVC tubes, a digital pressure gauge, a mount for a mannequin head or a filter cartridge of the RPE.

[0089] Fig. No. 4 “Schematic representation of the interaction of the device blocks”:

[0090] The interaction figure schematically shows the device blocks, where

[0091] 1- Mannequin head;

[0092] 2- Exhaled air;

[0093] 3- Sampling nozzle;

[0094] 4- Inhaled air;

[0095] 6- Differential pressure measuring device;

[0096] 7- Suction and discharge (bi-directional) blower;

[0097] 8- Air flow meter;

[0098] 9- Control controller;

[0099] 10- Inflatable head part;

[0100] 11- Internal power supply;

[0101] 12- Touch display;

[0102] 13- Oral opening branch

[0103] 14- Compressor.

[0104] The diagram shows that the control controller interacts with all units and sensors of the device.

[0105] The internal power supply communicates with the volumetric air flow meter, pressure sensors, blower, and control controller, providing the necessary energy to operate the above units.

[0106] Fig. No. 5. “Schematic representation of the device blocks.”

[0107] The figure shows the device in its longitudinal section. The image schematically depicts the device blocks, where

[0108] 1 - U control controller;

[0109] 2- Bi-directional blower driver;

[0110] 3- Bi-directional blower;

[0111] 4- Pipeline from the bidirectional air blower to the under-mask space;

[0112] 5- Oral opening fitting;

[0113] 6- Differential pressure sensor fitting;

[0114] 7- Touch display

[0115] Fig. 6 "Device Operation Algorithm." The figure schematically depicts the device's operating algorithm, where f is the required air supply parameter.

[0116] Fig. 7 "External view of the assembled device." The device is shown with two differential pressure fittings: nose and eye.

[0117] Fig. No. 8. "External appearance of the assembled device, inflated mannequin head." The device, with an inflated mannequin head.

[0118] Fig. No. 9 "Mass-dimensional example of the implementation of the utility model, presented in the form of providing the largest mass-dimensional dimensions." Connecting elements, nozzles, control controller, air flow resistance meter, air flow meter, adapters, indicated in the table are taken into account in the calculation in a total weight of about 1 kg.

[0119] Fig. No. 10 Comparative analysis of the overall dimensions of analogues and the utility model, presented in tabular form.

[0120] Fig. No. 11 Operating range of the air blower.

[0121] In the graph, the top line represents the range of a 14VDC blower, the bottom line represents the range of a 12VDC blower.

[0122] Implementation of a utility model

[0123] Structurally, the utility model looks like this:

[0124] The device consists of a mannequin head located on a base with a touch screen.

[0125] Description of the device design: a base in the form of a housing with an opening for the free passage of air flow during air flow generation. The base contains the following units: a connector for the power supply unit and a connection fitting for a calibration pressure gauge / draft-pressure gauge, an inflatable mannequin head with a mouthpiece and a pressure sensor fitting, a control controller with a blower driver, a display, a suction and discharge (bidirectional) blower, connecting elements and pipelines, an air flow resistance meter, an air flow meter, a touchscreen display, and a mounting point for the mannequin head.The mannequin head is connected to the base with fasteners. A single pipeline runs through the mannequin and the base, housing a bidirectional air blower. The pipeline turns in one direction and connects to the mouth nozzle to transfer the generated air flow into the sub-mask space. The mannequin head is made of a rigid base coated with silicone, between which is a pipeline leading to a blower with two valves—a check valve and a relief valve. Pressing the blower button forces air into the space between the base of the mannequin head and the silicone coating, while a check valve prevents air from escaping. A relief valve is provided to smoothly release air through the blower pipeline to the atmosphere. The mouth nozzle is located in the mouth area of ​​the mannequin head and is made of metal.In the sub-mask area (nose, mouth, chin, eye, other place) there is a nipple for the differential pressure sensor.

[0126] The mannequin head contains sensors measuring airflow resistance. The sensor is positioned in the area under the mask, at least one of the following locations: the mouth, the eye, or another area covered by the mask. The assembled device is shown in Fig. 7.

[0127] The device can also be supplemented with an internal power source to expand its potential use cases, including cases where it is necessary to test the RPE under constant air flow in places where there is no connection to electricity.

[0128] The device's mouthpiece can also be equipped with an adapter for attaching and subsequently testing the filter cartridge. This addition expands the device's range of functions.

[0129] A schematic representation of the device blocks is shown in figure No. 5

[0130] The device operates as follows: The controller, depending on the entered RPE test parameters, commands the blower. The blower, executing the controller's command, delivers a constant air flow through a pipeline containing a volumetric air flow meter, releasing the air through the mouthpiece. Air is drawn from the surrounding environment. A sensor measuring air flow resistance is located on the mannequin's head, determining the resistance within the mask.

[0131] How the device works:

[0132] The operating principle involves creating a constant airflow at a specified flow rate through the tested respirator in both the inhalation and exhalation directions and measuring the difference in air pressure between the ambient atmosphere and the pressure in the under-mask space of the respirator (airflow resistance). The inhalation / exhalation airflows are provided by a bidirectional air blower.

[0133] - In the “exhalation” mode, the air blower provides air supply at a constant flow rate into the sub-mask space of the test product with a specified flow rate in dm 3 / min required to conduct the test. Air is released through the respiratory protective equipment into the surrounding atmosphere.

[0134] - In the “inhalation” mode, the air blower provides a vacuum in the sub-mask space of the test product, forming a constant flow of air from the surrounding atmosphere through the RPE with a flow rate of dm 3 / mi, required for the test. The minus sign indicates that the air flow is directed inside the transducer, in the "inhalation" direction.

[0135] - Maintaining and regulating the set air flow values ​​is carried out automatically using a built-in flow meter and controller.

[0136] - The built-in pressure sensor measures the difference between the air pressure in the sub-mask space of the tested respirator and the surrounding environment (air flow resistance).

[0137] The operator selects the operating mode (task) of the utility model converter using a touchscreen display. Test parameters can be adapted to test requirements by increasing or decreasing the air flow rate.

[0138] The device operating algorithm is schematically described in Fig. No. 6.

[0139] Examples of the implementation of this device:

[0140] The personal protective equipment (PPE) Shans-E is being tested.

[0141] According to the instructions for the PPE, it is put on the Device.

[0142] The mannequin is inflated until it is obturation.

[0143] GOST R 53261-2009

[0144] The air flow is simulated (simulation of “exhalation”) in accordance with clause 4.1.6. GOST R5326261-2009, equal to 95 dm 3 / min., within 3 seconds, the required airflow level is reached and the airflow resistance is measured in accordance with GOST. The device displays a resistance value of 111 Pa on the touchscreen.

[0145] The PPE - GDZK-U is being tested

[0146] According to the instructions for the PPE, it is put on the Device.

[0147] The mannequin is inflated until it is obturation.

[0148] GOST R 53261-2009.

[0149] 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 seconds, the required airflow level is reached, and airflow resistance is measured in accordance with GOST standards. The device displays a resistance reading of 490 Pa on the touchscreen.

[0150] The readings of the resistance measurement sensor in the sub-mask space, reflected on the device display, are an indicator of the achievement of the technical result

[0151] The appearance of the device with an inflated dummy head is shown in Fig. No. 8.

[0152] Improved performance characteristics include faster RPE test results, thanks to the presented implementation of the utility model, as the test progress is displayed on the display during testing. The device is highly mobile, weighing no more than 4 kg, which is significantly lighter than a complete set of known analogs, which weigh over 12 kg. It can be used without an electrical outlet, which is not possible with known analogs.

[0153] The increased level of automation is achieved through the ability to send commands and receive results on the display, and the embedded software that performs a number of necessary operations, the control controller.

[0154] The reliability of the measured parameters is demonstrated by the exhaled air flow rate monitored by a volumetric air flow meter, the accuracy of which can also be confirmed by a pressure test manometer. Air flow testing of RPE can be performed to check the functionality of the exhalation valve as air flows through it, the initial airflow resistance during inhalation, and the airflow resistance during inhalation after exposure to dust. As can be seen from the GOST standard, the parameters being tested are quite clearly defined, and exceeding any stated parameter may be grounds for classifying the RPE as unsuitable for human use, emphasizing the need for a reliable record of RPE testing.Using a volumetric air flow meter, taking into account the resistance data in the under-mask space, received and processed by the control controller, allows maintaining the air flow rate at the value required for testing, reliably reflecting the test process on the display.

[0155] An example of the use of a universal constant air flow unit would be the following:

[0156] The test is carried out on a category 3 filter mask according to GOST 12.4.293-2015,

[0157] At a given inhalation flow rate of 90 dm 3 / min, the resistance was 213.4 Pa, while the actual flow is reflected by the value of 90 dm 3 / min.

[0158] At a set exhalation flow rate of 160 dm 3 / min resistance was 97.9 Pa, while the actual flow is reflected by the value of 164 dm 3 / min.

[0159] It should be noted that the set flow value and the actual flow do not always match, which is visible when generating the flow “on exhalation” and the difference is 4 dm 3 / min.

[0160] Analyzing the obtained data with the requirements for this type of RPE, the "inhalation" resistance is below the maximum value by 86.6 Pa; the "exhalation" resistance is below the maximum permissible 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.

[0161] When using a universal constant air flow unit, changes in values ​​can be quickly monitored during testing, as data such as the set flow, actual flow, and resistance are displayed. These data are key criteria for assessing test progress and the suitability of the respiratory protective equipment. Furthermore, the claimed utility model is a registered measuring instrument.

[0162] The creation of a mobile device that has a comparatively low weight and comparatively smaller overall dimensions, compared to existing analogs, with the ability to be connected to an electrical network and / or with the ability to be powered from an internal power source, without using an electrical network, is confirmed by the data shown in Figs. No. 9 and 10.

[0163] As can be seen from the table shown in Fig. No. 10, the overall dimensions and weight of the utility model are smaller than each of the known analogues.

[0164] The presented analogues do not have the ability to operate autonomously without an electrical network.

[0165] The solution to research problems is achieved through the possibility of using the device when testing filtering RPE for breathing resistance and air supply, new RPE, dusty RPE, RPE after use and in other conditions, to determine the suitability of a given RPE for use by a person, as well as the comfort of its use for a person, which in turn will allow during the development of RPE to select the most suitable RPE for the conditions of use, as well as RPE that performs its functions with the least resistance, for the comfort of breathing of a person in it.

[0166] A bidirectional blower is a blower, a particular form of which can be given as an example of a blower with the following parameters:

[0167] Voltage: 14V DC;

[0168] Maximum pressure: 8 kPa;

[0169] Current at maximum pressure: 6.1 A;

[0170] Speed ​​at maximum pressure: 22000 rpm;

[0171] Maximum air flow: 800 dm 3 / min;

[0172] Current at maximum air flow: 14 A;

[0173] Speed ​​at maximum air flow: 22000 rpm;

[0174] Magnetic pole pairs: 2 pole pairs.

[0175] The need to create an air flow of 300 dm 3 / min is justified by the existing requirements for filtering RPE (clause 5.5.3 “The exhalation valve must remain operational after a constant air flow of 300 dm3 passes through it 3 / min for 10 s." GOST 12.4.300-2015).

[0176] The RPE is designed to check the initial resistance during inhalation, where the maximum resistance value is 980 Pa at a flow rate of 95 dm3. 3 / min. Taking into account the characteristics of the presented blower, where the maximum characteristics of the blower are presented in graphical form in Fig. 11, where the lower line corresponds to the maximum operating range of the blower with a voltage of 12 V DC, the upper line corresponds to the maximum operating range of the blower with a voltage of 14 V DC.

[0177] 980 Pa = 100 mm of water column, which on the graph (perpendicular) corresponds to 0.83 cm. 95 dm 3 / min = 5.7 m 3 / hour. Air flow 95 dm 3 / min can be maintained at a resistance of 7060 Pa, which significantly exceeds all known values ​​of the tested parameters of the respiratory protective equipment.

[0178] 300 dm 3 / min = 18 m 3 / hour from the table above it follows that the air flow is 300 dm 3 / min can be maintained at a resistance of 1176 Pa, which significantly exceeds the known values ​​of the tested parameters of the respiratory protective equipment.

Claims

Device formula Universal constant air flow supply unit 1. The device "Universal unit for supplying constant air flow" is intended for testing filtering means of personal 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 - draft-pressure gauge, an inflatable dummy head with a mouth opening pipe and a pressure sensor fitting, a control controller, a display, a suction and pumping (bidirectional) air blower, connecting elements and pipelines, an air flow resistance meter, an air flow volumetric flow meter, consisting in a functional unity, characterized in that the air flow is generated by a bidirectional air blower by taking air from the atmosphere, the control controller performs the functions of automatically maintaining the required parameters of vacuum and air flow supply, the display is made in the form of a touch screen,the device is equipped with an external power supply; 2. The device according to paragraph 1, the mouth opening branch pipe of which is equipped with an adapter for attaching and checking the filter cartridge.

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

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

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