RU190589U1 - INSTALLATION FOR CHECKING THE TIGHTNESS, DUSTING AND AERODYNAMIC RESISTANCE OF REGENERATIVE PATRONS - Google Patents

Abstract

The utility model relates to the field of research indicators of the quality of materials and products, namely the creation of an installation for checking the tightness, dust emission and aerodynamic resistance of regenerative cartridges. Installation for checking the tightness, dust release and aerodynamic resistance of regenerative cartridges contains a compressor with a receiver, a container with a desiccant and an air purifier, a rotameter, an air flow switch (tap), a pressure difference meter, a connecting nipple. The advantage of the proposed installation, it is advisable to include the possibility of determining the tightness, dust emission and aerodynamic resistance of regenerative cartridges without dismantling them subject to safety regulations. 2 Il.

Description

The proposed utility model relates to the field of research indicators of the quality of materials and products.

The elimination or reduction of the risk of harm to human health, when exposed to harmful environmental factors, is ensured by the use of protective equipment and, in particular, by means of individual respiratory protection (RPE) [1].

Currently, the main part of the RPE consists of filtering gas masks, which have a number of indisputable advantages and perform the functions assigned to them. However, there are a number of fairly serious restrictions under which their use is impossible or strictly prohibited. These include the following:

- the presence in the atmosphere of an insufficient amount of oxygen (less than 17%);

- the presence in the atmosphere of substances that are not protected from the filter-absorbing box of the gas mask (chlorofluorohydrocarbons, carbon monoxide, combustion products);

- the presence in the atmosphere of ultrahigh concentrations of hazardous chemicals (accidents at chemically hazardous objects, spills in enclosed spaces);

- an unknown chemical environment that may develop in the event of an accident at a chemically hazardous facility, which has a wide range of chemicals of various nature and hazard classes in production cycles.

In all of the above cases, isolating breathing apparatus (IDA) must be used for protection.

In world practice, the creation of IDA most widely received two types: chemically bound oxygen and compressed air (oxygen). Also known devices of the combined type. The choice of one or another IDA design is determined, first of all, by the nature of its use. Indisputable advantages of IDA on chemically bound oxygen include:

- big time of protective action;

- small weight and dimensions;

- explosion safety under mechanical effects;

- simplicity of design;

- does not require additional equipment intended for their retransmission, and specially trained personnel.

Structurally, the IDA consists of the following basic elements [2]:

- the front part;

- regenerative cartridge;

- breathing bag;

- apparatus frame;

- bag for storage and carrying;

- connecting tube.

The most important element of the IDA is the regenerative cartridge (RP), the technical condition of which depends on whether the device will work as a whole.

Regenerative cartridges are subject to periodic inspection, during which one of the main indicators are:

- resistance to constant air flow;

- tightness;

- dust emission (the possibility of particles in the inhaled air of the regenerative product).

The essence of determining the resistance to a constant air flow is to measure the pressure difference between the inlet and the outlet of the evaluated sample when the air flow passes through it with the flow rate specified in the regulatory documentation. Determination of resistance to constant air flow of regenerative cartridges and filter boxes is carried out on the same type of installations.

The essence of the determination of tightness is to create and measure in the volume of the test sample overpressure in a regulated range.

The essence of the determination of dust emission is to create a constant stream of air through the regenerative cartridge in the direction of the inhalation line and control the presence of the regenerative product in the outgoing flow.

The order of carrying out, laboratory equipment and material and technical support of tests to determine the above indicators are given in GOST 10188-1974 and GOST 12.4.272-2014 [3, 4].

Known installation [3], consisting of a control valve, a rotameter, connecting device and measuring the difference in pressure. The installation is designed to determine the aerodynamic resistance of the RP to a constant air flow.

The aerodynamic resistance of the regenerative cartridge to a constant air flow is determined using a pressure difference meter while blowing an air flow through it with a given volume flow.

Known installation [4], which allows you to create excess pressure inside the test sample and measure its change over a set period of time. The installation includes: a control valve, a connecting device and a differential pressure meter. The installation is intended to determine both the tightness of the airflow system of IDA assembly, and its individual elements (for example, RP).

The tightness of the RP is determined by supplying purified air to it in the volume necessary to create a regulated overpressure and measuring the pressure drop over a specified period of time. The value of the allowable pressure drop is set by the specifications for a specific regenerative cartridge.

To determine the dust emission of the RP, an installation consisting of a control valve, a rotameter and a connecting device is used.

The assessment of dust emission consists in blowing through the regenerative cartridge of an air flow with a given volumetric flow rate and determining, using a chemical indicator, particles of the regenerative product carried along with the air flow.

The disadvantage of these installations is that they allow to determine only one of the required control parameters with the mandatory dismantling of the RP.

This significantly increases the time of testing, requires a large area for placement of facilities in the laboratory, a significant number of communications, instruments and equipment. In addition, each installation must be certified and regularly verified.

It should be noted that all three tests are carried out using the air flow generated by the compressor.

Analysis of the data of the facilities and test procedures of the RP showed that their implementation is possible in a single design.

The technical task, which is aimed at solving the claimed utility model, is to expand the functionality, reduce labor costs and improve performance when determining tightness, dust release and aerodynamic resistance of regenerative cartridges without dismantling them from the installation while observing safety regulations.

This problem is solved due to the fact that the stated installation of leak test, dust release and aerodynamic resistance of regenerative cartridges contains hermetically interconnected using air ducts, a compressor with a receiver, a container with a desiccant and an air purifier, a rotameter, a flow switch (tap), a pressure difference meter and connecting nipple.

The technical result provided by the above set of features is to determine the tightness, dust emission and aerodynamic resistance of regenerative cartridges without dismantling them while observing safety regulations.

The essence of the utility model is illustrated by drawings, which depict:

- in fig. 1 is a schematic diagram of the developed and designed installation;

1 - compressor with receiver; 2 - tank with dryer and air purifier; 3 - rotameter; 4 - air flow switch (tap); 5 - pressure difference meter; 6 - connecting nipple; 7 - regenerative cartridge.

- in fig. 2 - the appearance of the developed and designed installation.

The purpose of the compressor with receiver 1, tank with dryer and air purifier 2, rotameter 3, connecting nipple 6 and pressure difference meter 5 is similar to the operation of existing installations. Switch air flow (tap) 4 is designed to open or close the line definition of a controlled indicator. The installation works as follows:

- the compressor with receiver 1 is turned on, after filling the receiver, air is supplied through a tank with a desiccant and cleaner 2 to the flowmeter 3, then through the flow switch 4 (the measuring line is open) to the connecting nipple 6 and the pressure difference meter 5 connected to it;

- plugs are removed from the regenerative cartridge 7, and it is connected to the installation with the help of a connecting nipple 6;

- according to the reading of the pressure difference meter 5, the resistance of the regenerative cartridge 7 is determined (taking into account the unit’s own resistance);

- opposite the inhalation nozzle, there is a tampon wetted with a chemical indicator, and according to the absence of its coloring, the RP shall comply with the technical requirements for the dust emission indicator;

- intake pipe of RP 7 is closed with a plug, an overpressure is created in the installation in accordance with the requirements of the technical documentation for this sample; the air flow switch 4 is set to the “measuring line closed” position, the duration of the test is recorded, and according to the reading of the pressure difference meter 5, the compliance of the sample to the requirements is determined.

During the experimental approbation of the proposed installation, the possibility of determining the tightness, dust emission and aerodynamic resistance of regenerative cartridges was shown without dismantling them.

It should be noted that the time spent on evaluating ten RPs in terms of tightness, dust emission and aerodynamic drag on existing installations is approximately 25 to 40 minutes. To evaluate ten RPs, the developed installation takes no more than 18 minutes.

Additional advantages of the proposed installation should be attributed to the fact that it allows you to determine the tightness of the IDA air duct system assembly, and using a special adapter it is possible to determine the tightness of the breathing bag and the efficiency of the overpressure valve.

Literature

1. Nikitaev S.P., Shatalov E.V., Soloshin S.V., Sevostyanov A.A. Conceptual bases of directions for improving the means of individual respiratory protection [Text]. Abstracts of the VIII International Conference "The latest trends in the design and use of ballistic materials and means of protection." Khotkovo: Central Research Institute of Special Engineering, 2005 - p. 85-88.

2. Insulating mask IP-4M. Technical description and operating instructions [Text]. 1989. - 49 p.

3. GOST10188-74 Filter boxes for gas masks and respirators) method for determining resistance to constant air flow [Text]. - Enter 1975-01-01. - M .: Publishing house of standards, 1974. - 7 p.

4. GOST 12.4.272-2014 Occupational safety standards system. Personal respiratory protection. Isolating breathing apparatus with chemically bound or compressed oxygen. Technical requirements. Test methods. Marking Sampling rules. [Text]. - Enter 2015-12-01. - M .: Standardinform, 2015. - 28 p.

Claims (1)

Installation for checking tightness, dust release and aerodynamic resistance of regenerative cartridges containing a compressor with a receiver, a container with a desiccant and an air purifier, a flowmeter, an air flow switch - tap, a pressure difference meter, a connecting nipple.

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