RU2710793C1 - Device for laying foam support strips during annealing - Google Patents

Abstract

FIELD: fire safety.SUBSTANCE: invention relates to forest fire prevention and production of preventive burn-out of forest combustible materials, namely to portable motorized devices for laying foam support strips in order to produce annealing from them. Disclosed is a device for laying foam support strips during annealing, comprising a reservoir for liquid (7), fan (1) driven by an internal combustion engine, air shaft (3), fixed on the blower blow line, flexible pipeline (6) for supply of liquid from reservoir (7) into air shaft (3) and foam generator (8) fixed at the end of air shaft. Novelty is that the device is additionally equipped with ejector (4) placed inside the air shaft, in which pipeline (5) is coaxially installed with the possibility of movement relative to the longitudinal axis and fixation, hydraulically connected to flexible pipeline (6) for supply of liquid from reservoir (7). High-speed air jet generated by fan (1) in casing (2) passes along barrel (3) and enters ejector (4), where it is accelerated, and foaming composition is sucked out (ejects) from pipeline (5) connected via flexible pipeline (6) with backpack reservoir (7), on screens of foam generator (8), after which the foam on the soil surface forms a foam support strip. Amount of foaming agent corresponds to air flow rate, which increases device efficiency.EFFECT: improved performance of the device for laying foam support strips during annealing, increased efficiency and quality of the foam support strip, reduced non-productive consumption of energy and weight of the device.1 cl, 1 dwg

Description

The invention relates to the field of combating forest fires and the production of preventive burning of forest combustible materials, namely, portable motorized devices for laying foam support strips for the purpose of producing annealing from them.

A device is known for extinguishing the edge of a forest fire, containing a liquid reservoir, a fan driven by an internal combustion engine through a centrifugal clutch, an air barrel mounted on a blower nozzle, and a pipeline for supplying liquid from the reservoir to the air barrel (USSR Author's Certificate No. 1741819 , priority date 05/14/1990, publication date 06/23/1992, authors: V.F. Plyvch, V.A. Shmakov and S.N. Orlovsky, RU)

A disadvantage of the known device is that the fan drive occurs only at the maximum rotational speed of the engine crankshaft, while the air flow does not have time to create pressure in the tank when the operating mode changes, which creates an uneven supply of working fluid to the air barrel and, thereby, reduces the quality of the process of extinguishing the edge of the fire.

The closest in technical essence to the invention and adopted as a prototype is a device used for laying foam support strips in the fight against bottom forest fires, containing a reservoir for the working fluid, a fan driven by an internal combustion engine through a centrifugal clutch, a barrel mounted on fan discharge pipe, a pipe directed towards the air flow and connecting the internal cavity of the barrel with a tank for extinguishing or foaming liquid a pipeline for supplying working fluid from the reservoir to the trunk and a foam generator attached to the end of the barrel (Information leaflet of Krasnoyarsk Central Scientific Research Institute N 29-173-02 Small-sized forest fire blowers VLP-2,5 and VLP-20 for carrying out preventive maintenance and operational extinguishing of forest fires, prototype) or electronic resource: (https://studref.com/585510/bzhd/orudie_prokladki_pennyh_opomyh_polos_borby_lesnvmi_pozharami_takticheskie_raschyoty_primeneniya, date of view 09.07.2019, prototype).

The disadvantage of the prototype is that an excessively strong air flow prevents the formation of high-quality foam, and to reduce its speed, a throttle washer with a hole is installed in the barrel, which reduces the amount of air supplied to the foam generator. As a result, about 90% of the engine power is used irrationally, and insufficient pressure in the tank when working with a foam generator does not allow working with high performance.

The technical problem solved by the invention is the creation of a device for laying foam support strips in the production of annealing with improved performance, increasing labor productivity when laying foam support strips, improving their quality, reducing unproductive energy and weight of the device.

To solve a technical problem, a device is proposed for laying foam support strips during annealing, comprising a liquid reservoir, a fan driven by an internal combustion engine, an air barrel mounted on the discharge pipe of the fan, a flexible pipe for supplying liquid from the reservoir to the air barrel and a foam generator, fixed at the end of the air barrel. What is new is that the device is additionally equipped with an ejector located inside the air barrel, in which a pipeline is coaxially mounted, hydraulically connected to a flexible pipe for supplying liquid from the tank.

According to the invention, the pipeline in the ejector is mounted to move relative to the longitudinal axis and fix

The drawing schematically shows a device for laying foam support strips in the production of annealing, side view.

A device for laying foam support strips during annealing production contains an impeller of fan 1 directly connected to the crankshaft of the internal combustion engine, enclosed in a casing 2. An air barrel 3 is attached to the blower nozzle, inside of which an ejector 4 is mounted with a coaxially fixed pipeline 5 hydraulically connected with a flexible conduit 6, the other end of which is connected to the knapsack tank 7, and a foam generator 8 is mounted on the end of the air barrel 3.

The device operates as follows.

When laying a foam support strip for annealing (oncoming fire), the operator moves along the track of the support strip. A high-speed jet of air created by fan 1 in the casing 2 passes through the barrel 3 and enters the ejector 4, where it is accelerated, and the foam composition from the pipeline 5 is sucked (ejected) from the pipeline 5, connected through a flexible pipe 6 to the backpack bag 7, to the foam generator grids 8, after which the foam on the surface of the soil forms a foam support strip.

As a result, the fire, moving from the reference strip towards the forest fire, ensures the burning of forest combustible materials on the soil surface and when it encounters a forest fire flame, combustion on the burned-out section of the edge of the fire passed by the operator is completely stopped.

Using the proposed device will allow 5-6 times to increase labor productivity and the quality of the foam base strip to be laid, since the amount of the composition supplied to the foam generator will always correspond to the amount of air, and the diameter of the ejector hole will provide the optimal airflow power for the pricing process.

Thus, the technical result achieved by the implementation of the invention is to improve the performance of the device for laying foam support strips in the annealing production, to increase labor productivity and the quality of the foam support strip to be laid, as well as to reduce unproductive energy costs.

Claims (2)

1. A device for laying foam support strips during annealing, comprising a fluid reservoir, a fan driven by an internal combustion engine, an air barrel mounted on a blower nozzle, a flexible pipe for supplying fluid from the reservoir to the air barrel, and a foam generator mounted on the end air barrel, characterized in that the device is additionally equipped with an ejector located inside the air barrel, in which a pipeline is connected coaxially, hydraulically connected to flexible pipe for supplying fluid from the tank. 2. The device according to p. 1, characterized in that the pipeline in the ejector is installed with the possibility of movement relative to the longitudinal axis and fixation.

Images